#+PROPERTY: header-args :mkdirp yes
#+PROPERTY: header-args:bash       :tangle-mode (identity #o755) :comments link :shebang "#!/usr/bin/env bash"
#+PROPERTY: header-args:emacs-lisp :tangle ~/.emacs.d/init.el :mkdirp yes :eval never-export :exports both
#+TODO: CHECK(s) | OFF(o)
#+TITLE: Emacs config
#+OPTIONS: broken-links:auto h:6 toc:nil

#+begin_quote
One day we won't hate one another, no young boy will march to war and I will clean up my Emacs config. But that day isn't today.
#+end_quote
- Me, <2021-05-27 Thu 17:35> in commit 93a0573. Adapted from [[https://www.youtube.com/watch?v=pIdBinlW40E][The Dark Element - "The Pallbearer Walks Alone"]]. T_T

* Introduction
My configuration of [[https://www.gnu.org/software/emacs/][GNU Emacs]], an awesome +text editor+ piece of software that can do almost anything.

At the moment of writing this, that "almost anything" includes:
- *Programming environment*. With LSP & Co, Emacs is as good as many IDEs and is certainly on par with editors like VS Code.\\
  Emacs is also particularly great at writing Lisp code, e.g. Clojure, Common Lisp, and of course, Emacs Lisp.
- *Org Mode* is useful for a lot of things. My use cases include:
  - *[[https://leanpub.com/lit-config/read][Literate configuration]]*
  - *Interactive programming* à la Jupyter Notebook
  - *Task / project management*
  - *Formatting documents*. I've written my Master's Thesis in Org Mode.
  - *Notetaking*, mostly with org-roam and org-journal
- *File management*. Dired is my primary file manager.
- *Email*, with notmuch.
- *Multimedia management*, with EMMS.
- *RSS feed reader*, with elfeed.
- *Managing passwords*, with pass.
- *Messengers*:
  - *IRC*, with ERC.
  - *Telegram*, with telega.el
- *X Window management*, with EXWM. I literally live in Emacs.
- ...

As I mentioned above, this document is a piece of literate configuration, i.e. program code interwoven with (occasionally semi-broken) English-language commentary.

I find that approach helpful for maintaining the configuration, but the quality and quantity of comments may vary. I also usually incorporate my Emacs-related blog posts back into this config.

So, you might extract something of value from here if you're an avid Emacs user, but probably not if you're a newcomer to the Elisp wonderland. If the latter applies to you, I'd advise checking out David Wilson's [[https://www.youtube.com/c/SystemCrafters][System Crafters]] YouTube channel.

* Some remarks
I decided not to keep configs for features that I do not use anymore because this config is already huge. But here are the last commits that had these features presented.

| Feature                  | Last commit                              |
|--------------------------+------------------------------------------|
| org-roam dailies         | d2648918fcc338bd5c1cd6d5c0aa60a65077ccf7 |
| org-roam projects        | 025278a1e180e86f3aade20242e4ac1cdc1a2f13 |
| treemacs                 | 3d87852745caacc0863c747f1fa9871d367240d2 |
| tab-bar.el               | 19ff54db9fe21fd5bdf404a8d2612176baa8a6f5 |
| spaceline                | 19ff54db9fe21fd5bdf404a8d2612176baa8a6f5 |
| code compass             | 8594d6f53e42c70bbf903e168607841854818a38 |
| vue-mode                 | 8594d6f53e42c70bbf903e168607841854818a38 |
| svelte-mode              | 8594d6f53e42c70bbf903e168607841854818a38 |
| pomidor                  | 8594d6f53e42c70bbf903e168607841854818a38 |
| elfeed-score             | 8e591e0d2afd909ae5be00caf17f9b17c6cd8b61 |
| org-trello               | 3f5967a5f63928ea9c8567d8d9f31e84cdbbc21f |
| jabber                   | 9b0e73a4703ff35a2d30fd704200052888191217 |
| wallabag                 | 9b0e73a4703ff35a2d30fd704200052888191217 |
| conda                    | 609fc84e439b11ea5064f3a948079daebb654aca |
| notmuch tags keybindings | eac134c5456051171c1c777254f503cc71ce12cd |
| expand-region            | ab0d01c525f2b44dd64ec09747daf0fced4bd9c7 |
| org-latex-impatient      | ab0d01c525f2b44dd64ec09747daf0fced4bd9c7 |
| dired-single             | ab0d01c525f2b44dd64ec09747daf0fced4bd9c7 |
| progidy                  | ab0d01c525f2b44dd64ec09747daf0fced4bd9c7 |
| tree-sitter              | 1920a48aec49837d63fa88ca315928dc4e9d14c2 |

* Initial setup
Setting up the environment, performance tuning and a few basic settings.

First things first, lexical binding.
#+begin_src emacs-lisp
;;; -*- lexical-binding: t -*-
#+end_src

** Packages
*** straight.el
Straight.el is my Emacs package manager of choice. Its advantages & disadvantages over other options are listed pretty thoroughly in the README file in the repo.

The following is the bootstrap script of =straight.el=.

References:
- [[https://github.com/raxod502/straight.el][straight.el repo]]

#+begin_src emacs-lisp :noweb-ref minimal
(defvar bootstrap-version)
(let ((bootstrap-file
       (expand-file-name "straight/repos/straight.el/bootstrap.el" user-emacs-directory))
      (bootstrap-version 5))
  (unless (file-exists-p bootstrap-file)
    (with-current-buffer
        (url-retrieve-synchronously
         "https://raw.githubusercontent.com/raxod502/straight.el/develop/install.el"
         'silent 'inhibit-cookies)
      (goto-char (point-max))
      (eval-print-last-sexp)))
      (load bootstrap-file nil 'nomessage))
#+end_src
*** use-package
A macro to simplify package specification & configuration. Integrates with straight.el.

Set ~use-package-verbose~ to ~t~ to print out loading times for individual packages.

References:
- [[https://github.com/jwiegley/use-package][use-package repo]]

#+begin_src emacs-lisp :noweb-ref minimal
(straight-use-package 'use-package)
(eval-when-compile (require 'use-package))
#+end_src
** Variables & environment
This section is about optioning the Emacs config.

The following is true if Emacs is meant to be used with TRAMP over slow ssh. Take a look at the [[*TRAMP][TRAMP]] section for more details.
#+begin_src emacs-lisp
(setq my/slow-ssh
      (or
       (string= (getenv "IS_TRAMP") "true")))
#+end_src

The following is true is Emacs is run on a remote server where I don't need stuff like my org workflow
#+begin_src emacs-lisp
(setq my/remote-server
      (or (string= (getenv "IS_REMOTE") "true")
          (string= (system-name) "dev-digital")
          (string= (system-name) "violet")
          (string= (system-name) "viridian")))
#+end_src

And the following is true if Emacs is run from termux on Android.
#+begin_src emacs-lisp
(setq my/is-termux (string-match-p (rx (* nonl) "com.termux" (* nonl)) (getenv "HOME")))
#+end_src

Also, I sometimes need to know if a program is running inside Emacs (say, inside a terminal emulator). To do that, I set the following environment variable:
#+begin_src emacs-lisp
(setenv "IS_EMACS" "true")
#+end_src

Finally, I want to have a minimal Emacs config for debugging purposes. This has just straight.el, use-packages, and evil.
#+begin_src emacs-lisp :tangle ~/.emacs.d/init-minimal.el :noweb yes
<<minimal>>
#+end_src

To launch Emacs with this config, run
#+begin_src bash :eval no :tangle no
emacs -q -l ~/.emacs.d/init-minimal.el
#+end_src

A convinience macro:
#+begin_src emacs-lisp
(defmacro with-eval-after-load-norem (file &rest body)
  (declare (indent 1) (debug (form def-body)))
  `(unless my/remote-server
     (with-eval-after-load ,file
       ,@body)))
#+end_src
** Performance
*** Measure startup speed
A small function to print out the loading time and number of GCs during the loading. Can be useful as a point of data for optimizing Emacs startup time.
#+begin_src emacs-lisp
(setq my/emacs-started nil)

(add-hook 'emacs-startup-hook
          (lambda ()
            (message "*** Emacs loaded in %s with %d garbage collections."
                     (format "%.2f seconds"
                             (float-time
                              (time-subtract after-init-time before-init-time)))
                     gcs-done)
            (setq my/emacs-started t)))
#+end_src

Set the following to =t= to print debug information during the startup. This will include the order in which the packages are loaded and the loading time of individual packages.
#+begin_src emacs-lisp
;; (setq use-package-verbose t)
#+end_src

*** Garbage collection
Just setting ~gc-cons-treshold~ to a larger value.

#+begin_src emacs-lisp
(setq gc-cons-threshold 80000000)
(setq read-process-output-max (* 1024 1024))
#+end_src
*** Run garbage collection when Emacs is unfocused
Run GC when Emacs loses focus. +Time will tell if that's a good idea.+

Some time has passed, and I still don't know if there is any quantifiable advantage to this, but it doesn't hurt.

#+begin_src emacs-lisp
(add-hook 'emacs-startup-hook
          (lambda ()
            (if (boundp 'after-focus-change-function)
                (add-function :after after-focus-change-function
                              (lambda ()
                                (unless (frame-focus-state)
                                  (garbage-collect))))
              (add-hook 'after-focus-change-function 'garbage-collect))))
#+end_src
*** Measure RAM usage
I've noticed that Emacs occasionally eats a lot of RAM, especially when used with EXWM. This is my attempt to measure RAM usage.

I have some concerns that =ps -o rss= may be unrepresentative because of [[https://stackoverflow.com/questions/131303/how-can-i-measure-the-actual-memory-usage-of-an-application-or-process][shared memory]], but I guess this shouldn't be a problem here because there's only one process of Emacs.

#+begin_src emacs-lisp
(defun my/get-ram-usage-async (callback)
  (let* ((temp-buffer (generate-new-buffer "*ps*"))
         (proc (start-process "ps" temp-buffer "ps"
                              "-p" (number-to-string (emacs-pid)) "-o" "rss")))
    (set-process-sentinel
     proc
     (lambda (process _msg)
       (when (eq (process-status process) 'exit)
         (let* ((output (with-current-buffer temp-buffer
                          (buffer-string)))
                (usage (string-to-number (nth 1 (split-string output "\n")))))
           (ignore-errors
             (funcall callback usage)))
         (kill-buffer temp-buffer))))))

(defun my/ram-usage ()
  (interactive)
  (my/get-ram-usage-async
   (lambda (data)
     (message "%f Gb" (/ (float data) 1024 1024)))))
#+end_src
** Micromamba
[[https://github.com/mamba-org/mamba][mamba]] is a faster alternative to [[https://www.anaconda.com/][Anaconda]], a package and environment manager. =micromamba= is a tiny version that provides a subset of mamba commands.

[[https://github.com/SqrtMinusOne/micromamba.el][micromamba.el]] is my package to interact with the latter.

#+begin_src emacs-lisp
(use-package micromamba
  :straight t
  :if (executable-find "micromamba")
  :config
  (micromamba-activate "general"))
#+end_src
** Config files
*** Custom file location
By default, =custom= writes stuff to =init.el=, which is somewhat annoying. The following makes it write to a separate file =custom.el=

#+begin_src emacs-lisp
(setq custom-file (concat user-emacs-directory "custom.el"))
(load custom-file 'noerror)
#+end_src
*** authinfo
#+begin_src emacs-lisp
(setq auth-source-debug nil)
#+end_src
*** Private config
I have some variables which I don't commit to the repo, e.g. my current location. They are stored in =private.el=

#+begin_src emacs-lisp
(let ((private-file (expand-file-name "private.el" user-emacs-directory)))
  (when (file-exists-p private-file)
    (load-file private-file)))
#+end_src
*** No littering
By default Emacs and its packages create a lot files in =.emacs.d= and in other places. [[https://github.com/emacscollective/no-littering][no-littering]] is a collective effort to redirect all of that to two folders in =user-emacs-directory=.

#+begin_src emacs-lisp
(use-package no-littering
  :straight t)
#+end_src
** Prevent Emacs from closing
This adds a confirmation to avoid accidental Emacs closing.

#+begin_src emacs-lisp
(setq confirm-kill-emacs 'y-or-n-p)
#+end_src
* General settings
** Keybindings
*** general.el
general.el provides a convenient interface to manage Emacs keybindings.

References:
- [[https://github.com/noctuid/general.el][general.el repo]]

#+begin_src emacs-lisp
(use-package general
  :straight t
  :config
  (general-evil-setup))
#+end_src
*** which-key
A package that displays the available keybindings in a popup. The package is pretty useful, as Emacs seems to have more keybindings than I can remember at any given point.

References:
- [[https://github.com/justbur/emacs-which-key][which-key repo]]

#+begin_src emacs-lisp
(use-package which-key
  :config
  (setq which-key-idle-delay 0.3)
  (setq which-key-popup-type 'frame)
  (which-key-mode)
  (which-key-setup-side-window-bottom)
  (set-face-attribute 'which-key-local-map-description-face nil
                      :weight 'bold)
  :straight t)
#+end_src

**** dump keybindings
A function to dump keybindings starting with a prefix to a buffer in a tree-like form.

#+begin_src emacs-lisp
(defun my/dump-bindings-recursive (prefix &optional level buffer)
  (dolist (key (which-key--get-bindings (kbd prefix)))
    (with-current-buffer buffer
      (when level
        (insert (make-string level ? )))
      (insert (apply #'format "%s%s%s\n" key)))
    (when (string-match-p
           (rx bos "+" (* nonl))
           (substring-no-properties (elt key 2)))
      (my/dump-bindings-recursive
       (concat prefix " " (substring-no-properties (car key)))
       (+ 2 (or level 0))
       buffer))))

(defun my/dump-bindings (prefix)
  "Dump keybindings starting with PREFIX in a tree-like form."
  (interactive "sPrefix: ")
  (let ((buffer (get-buffer-create "bindings")))
    (with-current-buffer buffer
      (erase-buffer))
    (my/dump-bindings-recursive prefix 0 buffer)
    (with-current-buffer buffer
      (goto-char (point-min)))
    (switch-to-buffer-other-window buffer)))
#+end_src
*** Evil
An entire ecosystem of packages that emulates the main features of Vim. Probably the best vim emulator out there.

The only problem is that the package name makes it hard to google anything by just typing "evil".

References:
- [[https://github.com/emacs-evil/evil][evil repo]]
- [[https://www.youtube.com/watch?v=JWD1Fpdd4Pc][(YouTube) Evil Mode: Or, How I Learned to Stop Worrying and Love Emacs]]

**** Evil-mode
Basic evil configuration.

#+begin_src emacs-lisp :noweb-ref minimal
(use-package evil
  :straight t
  :init
  (setq evil-want-integration t)
  (setq evil-want-C-u-scroll t)
  (setq evil-want-keybinding nil)
  (setq evil-search-module 'evil-search)
  (setq evil-split-window-below t)
  (setq evil-vsplit-window-right t)
  (unless (display-graphic-p)
    (setq evil-want-C-i-jump nil))
  :config
  (evil-mode 1)
  ;; (setq evil-respect-visual-line-mode t)
  (evil-set-undo-system 'undo-tree)
  (general-define-key
   :states '(motion)
   "ze" nil))
#+end_src
**** Addons
[[https://github.com/emacs-evil/evil-surround][evil-surround]] emulates one of my favorite vim plugins, surround.vim. Adds a lot of parentheses management options.

#+begin_src emacs-lisp
(use-package evil-surround
  :straight t
  :after evil
  :config
  (global-evil-surround-mode 1))
#+end_src

[[https://github.com/linktohack/evil-commentary][evil-commentary]] emulates commentary.vim. It provides actions for quick insertion and deletion of comments.

#+begin_src emacs-lisp
(use-package evil-commentary
  :straight t
  :after evil
  :config
  (evil-commentary-mode))
#+end_src

[[https://github.com/blorbx/evil-quickscope][evil-quickscope]] emulates quickscope.vim. It highlights certain target characters for f, F, t, T keys.
#+begin_src emacs-lisp
(use-package evil-quickscope
  :straight t
  :after evil
  :config
  :hook ((prog-mode . turn-on-evil-quickscope-mode)
         (LaTeX-mode . turn-on-evil-quickscope-mode)
         (org-mode . turn-on-evil-quickscope-mode)))
#+end_src

[[https://github.com/cofi/evil-numbers][evil-numbers]] allows incrementing and decrementing numbers at point.
#+begin_src emacs-lisp
(use-package evil-numbers
  :straight t
  :commands (evil-numbers/inc-at-pt evil-numbers/dec-at-pt)
  :init
  (general-nmap
    "g+" 'evil-numbers/inc-at-pt
    "g-" 'evil-numbers/dec-at-pt))
#+end_src

[[https://github.com/edkolev/evil-lion][evil-lion]] provides alignment operators, somewhat similar to vim-easyalign.
#+begin_src emacs-lisp
(use-package evil-lion
  :straight t
  :config
  (setq evil-lion-left-align-key (kbd "g a"))
  (setq evil-lion-right-align-key (kbd "g A"))
  (evil-lion-mode))
#+end_src

[[https://github.com/redguardtoo/evil-matchit][evil-matchit]] makes "%" to match things like tags. It doesn't work perfectly, so I +occasionally+ turn it off.
#+begin_src emacs-lisp
(use-package evil-matchit
  :straight t
  :disabled
  :config
  (global-evil-matchit-mode 1))
#+end_src
**** My additions
Do ex search in other buffer. Like =*=, but switch to other buffer and search there.

#+begin_src emacs-lisp
(defun my/evil-ex-search-word-forward-other-window (count &optional symbol)
  (interactive (list (prefix-numeric-value current-prefix-arg)
                     evil-symbol-word-search))
  (save-excursion
    (evil-ex-start-word-search nil 'forward count symbol))
  (other-window 1)
  (evil-ex-search-next))

(general-define-key
 :states '(normal)
 "&" #'my/evil-ex-search-word-forward-other-window)
#+end_src
**** evil-collection
[[https://github.com/emacs-evil/evil-collection][evil-collection]] is a package that provides evil bindings for a lot of different packages. One can see the complete list in the [[https://github.com/emacs-evil/evil-collection/tree/master/modes][modes]] folder.

#+begin_src emacs-lisp :noweb-ref minimal
(use-package evil-collection
  :straight t
  :after evil
  :config
  (evil-collection-init
   '(eww devdocs proced emms pass calendar dired ivy debug guix calc
         docker ibuffer geiser pdf info elfeed edebug bookmark company
         vterm flycheck profiler cider explain-pause-mode notmuch custom
         xref eshell helpful compile comint git-timemachine magit prodigy
         slime forge deadgrep vc-annonate telega doc-view gnus)))
#+end_src
*** Avy
[[https://github.com/abo-abo/avy][Avy]] is a package that helps navigate Emacs in a tree-like manner.

References:
- [[https://karthinks.com/software/avy-can-do-anything/][Avy can do anything]]

#+begin_src emacs-lisp
(use-package avy
  :straight t
  :config
  (setq avy-timeout-seconds 0.5)
  (setq avy-ignored-modes
        '(image-mode doc-view-mode pdf-view-mode exwm-mode))
  (general-define-key
   :states '(normal motion)
   "-" nil
   "--" #'avy-goto-char-2
   "-=" #'avy-goto-symbol-1))
#+End_src

[[https://github.com/abo-abo/ace-link][ace-link]] is a package to jump to links with avy.
#+begin_src emacs-lisp
(use-package ace-link
  :straight t
  :commands (ace-link-info ace-link-help ace-link-woman ace-link-eww))
#+end_src
*** My keybindings
Various keybinding settings that I can't put anywhere else.

**** Escape key
+Use the escape key instead of =C-g= whenever possible+ No, not really after 2 years... But I'll keep this fragment.

I must have copied it from somewhere, but as I googled to find out the source, I discovered quite a number of variations of the following code over time. I wonder if Richard Dawkins was inspired by something like this a few decades ago.

#+begin_src emacs-lisp
(defun minibuffer-keyboard-quit ()
  "Abort recursive edit.
In Delete Selection mode, if the mark is active, just deactivate it;
then it takes a second \\[keyboard-quit] to abort the minibuffer."
  (interactive)
  (if (and delete-selection-mode transient-mark-mode mark-active)
      (setq deactivate-mark  t)
    (when (get-buffer "*Completions*") (delete-windows-on "*Completions*"))
    (abort-recursive-edit)))

(defun my/escape-key ()
  (interactive)
  (evil-ex-nohighlight)
  (keyboard-quit))

(general-define-key
 :keymaps '(normal visual global)
 [escape] #'my/escape-key)

(general-define-key
 :keymaps '(minibuffer-local-map
            minibuffer-local-ns-map
            minibuffer-local-completion-map
            minibuffer-local-must-match-map
            minibuffer-local-isearch-map)
 [escape] 'minibuffer-keyboard-quit)
#+end_src
**** Home & end
#+begin_src emacs-lisp
(general-def :states '(normal insert visual)
  "<home>" 'beginning-of-line
  "<end>" 'end-of-line)
#+end_src
**** My leader
Using the =SPC= key as a leader key, like in Doom Emacs or Spacemacs.

#+begin_src emacs-lisp
(general-create-definer my-leader-def
  :keymaps 'override
  :prefix "SPC"
  :states '(normal motion emacs))

(general-def :states '(normal motion emacs)
  "SPC" nil
  "M-SPC" (general-key "SPC"))

(general-def :states '(insert)
  "M-SPC" (general-key "SPC" :state 'normal))

(my-leader-def "?" 'which-key-show-top-level)
(my-leader-def "E" 'eval-expression)

(general-def :states '(insert)
  "<f1> e" #'eval-expression)

(my-leader-def
  "SPC" '(:wk "second level")
  "SPC x" '(:wk "ctl-x")
  "SPC x" ctl-x-map)
#+end_src

=general.el= has a nice integration with which-key, so I use that to show more descriptive annotations for certain groups of keybindings (the default annotation is just =prefix=).
#+begin_src emacs-lisp
(my-leader-def
  "a" '(:which-key "apps"))
#+end_src
**** Universal argument
Change the universal argument to =M-u=. I use =C-u= to scroll up, as I'm used to from vim.

#+begin_src emacs-lisp
(general-def
  :keymaps 'universal-argument-map
  "M-u" 'universal-argument-more)
(general-def
  :keymaps 'override
  :states '(normal motion emacs insert visual)
  "M-u" 'universal-argument)
#+end_src
**** Profiler
The built-in profiler is a magnificent tool to troubleshoot performance issues.

#+begin_src emacs-lisp
(my-leader-def
  :infix "P"
  "" '(:which-key "profiler")
  "s" 'profiler-start
  "e" 'profiler-stop
  "p" 'profiler-report)
#+end_src
**** Buffer switching
Some keybindings I used in vim to switch buffers and can't let go of. But I think I started to use these less since I made an attempt in [[*i3 integration][i3 integration]].

#+begin_src emacs-lisp
(general-define-key
  :keymaps 'override
  "C-<right>" 'evil-window-right
  "C-<left>" 'evil-window-left
  "C-<up>" 'evil-window-up
  "C-<down>" 'evil-window-down
  "C-h" 'evil-window-left
  "C-l" 'evil-window-right
  "C-k" 'evil-window-up
  "C-j" 'evil-window-down
  "C-x h" 'previous-buffer
  "C-x l" 'next-buffer)

(general-define-key
 :keymaps 'evil-window-map
 "x" 'kill-buffer-and-window
 "d" 'kill-current-buffer)
#+end_src

=winner-mode= to keep the history of window states.

It doesn't play too well with perspective.el, that is it has a single history list for all of the perspectives. But it is still quite usable.

#+begin_src emacs-lisp
(winner-mode 1)

(general-define-key
 :keymaps 'evil-window-map
 "u" 'winner-undo
 "U" 'winner-redo)
#+end_src
**** Buffer management
#+begin_src emacs-lisp
(my-leader-def
  :infix "b"
  "" '(:which-key "buffers")
  "s" '((lambda () (interactive) (switch-to-buffer (persp-scratch-buffer)))
        :which-key "*scratch*")
  "m" '((lambda () (interactive) (persp-switch-to-buffer "*Messages*"))
        :which-key "*Messages*")
  "l" 'next-buffer
  "h" 'previous-buffer
  "k" 'kill-buffer
  "b" 'persp-ivy-switch-buffer
  "r" 'revert-buffer
  "u" 'ibuffer)
#+end_src
**** xref
Some keybindings for xref and go to definition.

#+begin_src emacs-lisp
(general-nmap
  "gD" 'xref-find-definitions-other-window
  "gr" 'xref-find-references
  "gd" 'evil-goto-definition)

(my-leader-def
  "fx" 'xref-find-apropos)
#+end_src

#+begin_src emacs-lisp
(use-package xref
  :straight (:type built-in))
#+end_src

**** Folding
There are multiple ways to fold text in Emacs.

The most versatile is the built-in =hs-minor-mode=, which seems to work out of the box for Lisps, C-like languages, and Python. =outline-minor-mode= works for org-mode, LaTeX and the like. There is a 3rd-party solution [[https://github.com/elp-revive/origami.el][origami.el]], which I found to be somewhat less stable.

Evil does a pretty good job of abstracting all these packages with a set of vim-like keybindings. I was using =SPC= in vim, but as now this isn't an option, I set =TAB= to toggle folding.

#+begin_src emacs-lisp
(require 'hideshow)
(general-define-key
 :keymaps '(hs-minor-mode-map outline-minor-mode-map)
 :states '(normal motion)
 "ze" 'hs-hide-level
 "TAB" 'evil-toggle-fold)
#+end_src
**** Zoom UI
#+begin_src emacs-lisp
(defun my/zoom-in ()
  "Increase font size by 10 points"
  (interactive)
  (set-face-attribute 'default nil
                      :height
                      (+ (face-attribute 'default :height) 10)))

(defun my/zoom-out ()
  "Decrease font size by 10 points"
  (interactive)
  (set-face-attribute 'default nil
                      :height
                      (- (face-attribute 'default :height) 10)))

;; change font size, interactively
(global-set-key (kbd "C-+") 'my/zoom-in)
(global-set-key (kbd "C-=") 'my/zoom-out)
#+end_src
** i3 integration
UPD <2021-11-27 Sat>. I have finally switched to EXWM as my window manager, but as long as I keep i3 as a backup solution, this section persists. Check out the [[https://sqrtminusone.xyz/posts/2021-10-04-emacs-i3/][post]] for a somewhat better presentation.

One advantage of EXWM for an Emacs user is that EXWM gives one set of keybindings to manage both Emacs windows and X windows. In every other WM, like my preferred [[https://i3wm.org][i3wm]], two orthogonal keymaps seem to be necessary. But, as both programs are quite customizable, I want to see whether I can replicate at least some part of the EXWM goodness in i3.

But why not just use EXWM? One key reason is that to my taste (and perhaps on my hardware) EXWM didn't feel snappy enough. Also, I really like i3's tree-based layout structure; I feel like it fits my workflow much better than anything else I tried, including the master/stack paradigm of [[https://xmonad.org/][XMonad]]​, for instance.

One common point of criticism of i3 is that it is not extensible enough, especially compared to WMs that are configured in an actual programing language, like the mentioned XMonad, [[http://www.qtile.org/][Qtile]], [[https://awesomewm.org/][Awesome]], etc. But I think i3's extensibility is underappreciated, although the contents of this section may lie closer to the limits of how far one can go there.

The basic idea is to launch a normal i3 command with =i3-msg= in case the current window is not Emacs, otherwise pass that command to Emacs with =emacsclient=. In Emacs, execute the command if possible, otherwise pass the command back to i3.

This may seem like a lot of overhead, but I didn't feel it even in the worst case (i3 -> Emacs -> i3), so at least in that regard, the interaction feels seamless. The only concern is that this command flow is vulnerable to Emacs getting stuck, but it is still much less of a problem than with EXWM.

One interesting observation here is that Emacs windows and X windows are sort of one-level entities, so I can talk just about "windows".

At any rate, we need a script to do the i3 -> Emacs part:
#+begin_src bash :tangle ~/bin/scripts/emacs-i3-integration
if [[ $(xdotool getactivewindow getwindowname) =~ ^emacs(:.*)?@.* ]]; then
    command="(my/emacs-i3-integration \"$@\")"
    emacsclient -e "$command"
else
    i3-msg $@
fi
#+end_src

This script is being run from the [[file:Desktop.org::*i3wm][i3 configuration]].

For this to work, we need to make sure that Emacs starts a server, so here is an expression to do just that:
#+BEGIN_SRC emacs-lisp
(unless my/remote-server
  (add-hook 'after-init-hook #'server-start))
#+END_SRC

And here is a simple macro to do the Emacs -> i3 part:
#+begin_src emacs-lisp
(defmacro i3-msg (&rest args)
  `(start-process "emacs-i3-windmove" nil "i3-msg" ,@args))
#+end_src

Now we have to handle the required set of i3 commands. It is worth noting here that I'm not trying to implement a general mechanism to apply i3 commands to Emacs, rather I'm implementing a small subset that I use in my i3 configuration and that maps reasonably to the Emacs concepts.

Also, I use [[https://github.com/emacs-evil/evil][evil-mode]] and generally configure the software to have vim-style bindings where possible. So if you don't use evil-mode you'd have to detangle the given functions from evil, but then, I guess, you do not use super+hjkl to manage windows either.

First, for the =focus= command I want to move to an Emacs window in the given direction if there is one, otherwise move to an X window in the same direction. Fortunately, i3 and windmove have the same names for directions, so the function is rather straightforward.

One caveat here is that the minibuffer is always the bottom-most Emacs window, so it is necessary to check for that as well.
#+begin_src emacs-lisp
(defun my/emacs-i3-windmove (dir)
  (let ((other-window (windmove-find-other-window dir)))
    (if (or (null other-window) (window-minibuffer-p other-window))
        (i3-msg "focus" (symbol-name dir))
      (windmove-do-window-select dir))))
#+end_src

For the =move= I want the following behavior:
- if there is space in the required direction, move the Emacs window there;
- if there is no space in the required direction, but space in two orthogonal directions, move the Emacs window so that there is no more space in the orthogonal directions;
- otherwise, move an X window (Emacs frame).

For the first part, =window-swap-states= with =windmove-find-other-window= do well enough.

=evil-move-window= works well for the second part. By itself it doesn't behave quite like i3, for instance, =(evil-move-window 'right)= in a three-column split would move the window from the far left side to the far right side (bypassing center). Hence the combination as described here.

So here is a simple predicate which checks whether there is space in the given direction.
#+begin_src emacs-lisp
(defun my/emacs-i3-direction-exists-p (dir)
  (cl-some (lambda (dir)
          (let ((win (windmove-find-other-window dir)))
            (and win (not (window-minibuffer-p win)))))
        (pcase dir
          ('width '(left right))
          ('height '(up down)))))
#+end_src

And the implementation of the move command.
#+begin_src emacs-lisp
(defun my/emacs-i3-move-window (dir)
  (let ((other-window (windmove-find-other-window dir))
        (other-direction (my/emacs-i3-direction-exists-p
                          (pcase dir
                            ('up 'width)
                            ('down 'width)
                            ('left 'height)
                            ('right 'height)))))
    (cond
     ((and other-window (not (window-minibuffer-p other-window)))
      (window-swap-states (selected-window) other-window))
     (other-direction
      (evil-move-window dir))
     (t (i3-msg "move" (symbol-name dir))))))
#+end_src

Next on the line are =resize grow= and =resize shrink=. =evil-window-= functions do nicely for this task.

This function also checks whether there is space to resize in the given direction with the help of the predicate defined above. The command is forwarded back to i3 if there is not.
#+begin_src emacs-lisp
(defun my/emacs-i3-resize-window (dir kind value)
  (if (or (one-window-p)
          (not (my/emacs-i3-direction-exists-p dir)))
      (i3-msg "resize" (symbol-name kind) (symbol-name dir)
              (format "%s px or %s ppt" value value))
    (setq value (/ value 2))
    (pcase kind
      ('shrink
       (pcase dir
         ('width
          (evil-window-decrease-width value))
         ('height
          (evil-window-decrease-height value))))
      ('grow
       (pcase dir
         ('width
          (evil-window-increase-width value))
         ('height
          (evil-window-increase-height value)))))))
#+end_src

[[https://github.com/emacsorphanage/transpose-frame][transpose-frame]] is a package to "transpose" the current frame layout, which behaves someone similar to the =layout toggle split= command in i3, so I'll use it as well.
#+begin_src emacs-lisp
(use-package transpose-frame
  :straight t
  :commands (transpose-frame))
#+end_src

Finally, the entrypoint for the Emacs integration. In addition to the commands defined above, it processes =split= and =kill= commands and passes every other command back to i3.
#+begin_src emacs-lisp
(defun my/emacs-i3-integration (command)
  (pcase command
    ((rx bos "focus")
     (my/emacs-i3-windmove
      (intern (elt (split-string command) 1))))
    ((rx bos "move")
     (my/emacs-i3-move-window
      (intern (elt (split-string command) 1))))
    ((rx bos "resize")
     (my/emacs-i3-resize-window
       (intern (elt (split-string command) 2))
       (intern (elt (split-string command) 1))
       (string-to-number (elt (split-string command) 3))))
    ("layout toggle split" (transpose-frame))
    ("split h" (evil-window-split))
    ("split v" (evil-window-vsplit))
    ("kill" (evil-quit))
    (- (i3-msg command))))
#+end_src
** Editing text
Various packages, tricks, and settings that help with the central task of Emacs - editing text.
*** Indentation & whitespace
**** Aggressive Indent
A package to keep the code intended.

Doesn't work too well with many ecosystems because the LSP-based indentation is rather slow but nice for Lisps.

References:
- [[https://github.com/Malabarba/aggressive-indent-mode][aggressive-indent-mode repo]]

#+begin_src emacs-lisp
(use-package aggressive-indent
  :commands (aggressive-indent-mode)
  :straight t)
#+end_src
**** Delete trailing whitespace
Delete trailing whitespace on save, unless in particular modes where trailing whitespace is important, like Markdown.

#+begin_src emacs-lisp
(setq my/trailing-whitespace-modes '(markdown-mode))

(require 'cl-extra)

(add-hook 'before-save-hook
          (lambda ()
            (unless (cl-some #'derived-mode-p my/trailing-whitespace-modes)
              (delete-trailing-whitespace))))
#+end_src
**** Tabs
Some default settings to manage tabs.
#+begin_src emacs-lisp
(setq tab-always-indent nil)

(setq-default default-tab-width 4)
(setq-default tab-width 4)
(setq-default evil-indent-convert-tabs nil)
(setq-default indent-tabs-mode nil)
(setq-default evil-shift-round nil)
#+end_src
*** Settings
**** Scrolling
#+begin_src emacs-lisp
(setq scroll-conservatively scroll-margin)
(setq scroll-step 1)
(setq scroll-preserve-screen-position t)
(setq scroll-error-top-bottom t)
(setq mouse-wheel-progressive-speed nil)
(setq mouse-wheel-inhibit-click-time nil)
#+end_src
**** Clipboard
#+begin_src emacs-lisp
(setq select-enable-clipboard t)
(setq mouse-yank-at-point t)
#+end_src
**** Backups
#+begin_src emacs-lisp
(setq backup-inhibited t)
(setq auto-save-default nil)
#+end_src
*** Undo Tree
Replaces Emacs built-in sequential undo system with a tree-based one. Probably one of the greatest options of Emacs as a text editor.

References:
- [[https://www.emacswiki.org/emacs/UndoTree][UndoTree on EmacsWiki]]

#+begin_src emacs-lisp
(use-package undo-tree
  :straight t
  :config
  (global-undo-tree-mode)
  (setq undo-tree-visualizer-diff t)
  (setq undo-tree-visualizer-timestamps t)
  (setq undo-tree-auto-save-history nil)

  (my-leader-def "u" 'undo-tree-visualize)
  (fset 'undo-auto-amalgamate 'ignore)
  (setq undo-limit 6710886400)
  (setq undo-strong-limit 100663296)
  (setq undo-outer-limit 1006632960))
#+end_src

*** Snippets
A snippet system for Emacs and a collection of pre-built snippets.

~yasnippet-snippets~ has to be loaded before ~yasnippet~ for user snippets to override the pre-built ones.

Edit <2022-04-11 Mon> I don't really use ~yasnippet-snippets~, so I'd rather write stuff manually.

References:
- [[http://joaotavora.github.io/yasnippet/][yasnippet documentation]]

#+begin_src emacs-lisp
(use-package yasnippet-snippets
  :disabled
  :straight t)

(use-package yasnippet
  :straight t
  :config
  (setq yas-snippet-dirs
        `(,(concat (expand-file-name user-emacs-directory) "snippets")
          ;; yasnippet-snippets-dir
          ))
  (setq yas-triggers-in-field t)
  (yas-global-mode 1)
  (my-leader-def
    :keymaps 'yas-minor-mode-map
    :infix "es"
    "" '(:wk "yasnippet")
    "n" #'yas-new-snippet
    "s" #'yas-insert-snippet
    "v" #'yas-visit-snippet-file))

(general-imap "M-TAB" 'company-yasnippet)
#+end_src
*** Other small packages
**** Managing parentheses (smartparens)
A minor mode to deal with pairs. Its functionality overlaps with evil-surround, but smartparens provides the most comfortable way to do stuff like automatically insert pairs.

References:
- [[https://github.com/Fuco1/smartparens][smartparens repo]]

#+begin_src emacs-lisp
(use-package smartparens
  :straight t)
#+end_src
**** Visual fill column mode
#+begin_src emacs-lisp
(use-package visual-fill-column
  :straight t
  :commands (visual-fill-column-mode)
  :config
  (add-hook 'visual-fill-column-mode-hook
            (lambda () (setq visual-fill-column-center-text t))))
#+end_src
**** Accents
Input accented characters.

#+begin_src emacs-lisp
(use-package accent
  :straight t
  :init
  (general-define-key
   :states '(normal)
   "gs" #'accent-menu)
  (general-define-key
   :states '(normal insert)
   "M-n" #'accent-menu)
  :commands (accent-menu)
  :config
  (general-define-key
   :keymaps 'popup-menu-keymap
   "C-j" #'popup-next
   "C-k" #'popup-previous
   "M-j" #'popup-next
   "M-k" #'popup-previous)
  (setq accent-custom '((a (ā))
                        (A (Ā)))))
#+end_src
** Working with projects
Packages related to managing projects.

I used to have [[https://github.com/Alexander-Miller/treemacs][Treemacs]] here, but in the end decided that dired with [[https://github.com/jojojames/dired-sidebar][dired-sidebar]] does a better job. Dired has its separate section in "Applications".

*** Projectile
[[https://github.com/bbatsov/projectile][Projectile]] gives a bunch of useful functions for managing projects, like finding files within a project, fuzzy-find, replace, etc.

~defadvice~ is meant to speed projectile up with TRAMP a bit.
#+begin_src emacs-lisp
(use-package projectile
  :straight t
  :config
  (projectile-mode +1)
  (setq projectile-project-search-path '("~/Code" "~/Documents"))
  (defadvice projectile-project-root (around ignore-remote first activate)
    (unless (file-remote-p default-directory) ad-do-it)))

(use-package counsel-projectile
  :after (counsel projectile)
  :straight t)

(my-leader-def
  "p" '(:keymap projectile-command-map :which-key "projectile"))

(general-nmap "C-p" 'counsel-projectile-find-file)
#+end_src
*** Git & Magit
[[https://magit.vc/][Magit]] is a git interface for Emacs. The closest non-Emacs alternative (sans actual clones) I know is [[https://github.com/jesseduffield/lazygit][lazygit]], which I used before Emacs.

#+begin_src emacs-lisp
(use-package magit
  :straight t
  :commands (magit-status magit-file-dispatch)
  :init
  (my-leader-def
    "m" 'magit
    "M" 'magit-file-dispatch)
  :config
  (setq magit-blame-styles
        '((headings
           (heading-format . "%-20a %C %s\n"))
          (highlight
           (highlight-face . magit-blame-highlight))
          (lines
           (show-lines . t)
           (show-message . t)))))
#+end_src

[[https://github.com/magit/forge][forge]] provides integration with forges, such as GitHub and GitLab.
#+begin_src emacs-lisp
(use-package forge
  :after magit
  :straight t
  :config
  (add-to-list 'forge-alist '("gitlab.etu.ru"
                              "gitlab.etu.ru/api/v4"
                              "gitlab.etu.ru"
                              forge-gitlab-repository)))
#+end_src

[[https://github.com/emacsorphanage/git-gutter][git-gutter]] is a package which shows git changes for each line (added/changed/deleted lines).
#+begin_src emacs-lisp
(use-package git-gutter
  :straight t
  :if (not my/slow-ssh)
  :config
  (global-git-gutter-mode +1))
#+end_src

[[https://github.com/emacsmirror/git-timemachine][git-timemachine]] allows visiting previous versions of a file.
#+begin_src emacs-lisp
(use-package git-timemachine
  :straight t
  :commands (git-timemachine))
#+end_src

*** Editorconfig
Editorconfig support for Emacs.

References:
- [[https://editorconfig.org/][Editorconfig reference]]

#+begin_src emacs-lisp
(use-package editorconfig
  :straight t
  :config
  (unless my/slow-ssh (editorconfig-mode 1))
  (add-to-list 'editorconfig-indentation-alist
               '(emmet-mode emmet-indentation)))
#+end_src

*** Editing files
A minor mode to remember recently edited files.
#+begin_src emacs-lisp
(recentf-mode 1)
#+end_src

Save the last place visited in the file.
#+begin_src emacs-lisp
(save-place-mode nil)
#+end_src
*** Deadgrep
[[https://github.com/Wilfred/deadgrep][deadgrep]] is a nice Emacs interface for [[https://github.com/BurntSushi/ripgrep][ripgrep]]. Running =ivy-occur= in =counsel-rg= does something a bit similar, but the deadgrep is more full-featured.

Somehow I couldn't hook =toogle-truncate-lines= into the existing package hooks, so here goes advice.

#+begin_src emacs-lisp
(defun my/deadgrep-fix-buffer-advice (fun &rest args)
  (let ((buf (apply fun args)))
    (with-current-buffer buf
      (toggle-truncate-lines 1))
    buf))

(use-package deadgrep
  :straight t
  :commands (deadgrep)
  :config
  (advice-add #'deadgrep--buffer :around #'my/deadgrep-fix-buffer-advice))
#+end_src

** Completion
*** Ivy, counsel, swiper
Minibuffer completion tools for Emacs.

References:
- [[https://oremacs.com/swiper/][repo]]
- [[https://oremacs.com/swiper/][User Manual]]

#+begin_src emacs-lisp
(use-package ivy
  :straight t
  :config
  (setq ivy-use-virtual-buffers t)
  (ivy-mode))

(use-package counsel
  :straight t
  :after ivy
  :config
  (counsel-mode))

(use-package swiper
  :defer t
  :straight t)
#+end_src
*** ivy-rich
[[https://github.com/Yevgnen/ivy-rich][ivy-rich]] provides a more informative interface for ivy.
#+begin_src emacs-lisp
(use-package ivy-rich
  :straight t
  :after ivy
  :config
  (ivy-rich-mode 1)
  (setcdr (assq t ivy-format-functions-alist) #'ivy-format-function-line))
#+end_src

*** prescient
A package that enhances sorting & filtering of candidates. =ivy-prescient= adds integration with Ivy.

References:
- [[https://github.com/raxod502/prescient.el][prescient.el repo]]
#+begin_src emacs-lisp :noweb yes
(use-package ivy-prescient
  :straight t
  :after counsel
  :config
  (ivy-prescient-mode +1)
  (setq ivy-prescient-retain-classic-highlighting t)
  (prescient-persist-mode 1)
  (setq ivy-prescient-sort-commands
        '(:not swiper
               swiper-isearch
               ivy-switch-buffer
               ;; ivy-resume
               ;; ivy--restore-session
               lsp-ivy-workspace-symbol
               dap-switch-stack-frame
               my/dap-switch-stack-frame
               dap-switch-session
               dap-switch-thread
               counsel-grep
               ;; counsel-find-file
               counsel-git-grep
               counsel-rg
               counsel-ag
               counsel-ack
               counsel-fzf
               counsel-pt
               counsel-imenu
               counsel-yank-pop
               counsel-recentf
               counsel-buffer-or-recentf
               proced-filter-interactive
               proced-sort-interactive
               perspective-exwm-switch-perspective
               my/persp-ivy-switch-buffer-other-window
               lsp-execute-code-action
               dired-recent-open))
  ;; Do not use prescient in find-file
  (ivy--alist-set 'ivy-sort-functions-alist #'read-file-name-internal #'ivy-sort-file-function-default))
#+end_src
*** keybindings
Setting up quick access to various completions.

#+begin_src emacs-lisp
(my-leader-def
  :infix "f"
  "" '(:which-key "various completions")'
  ;; "b" 'counsel-switch-buffer
  "b" 'persp-ivy-switch-buffer
  "e" 'micromamba-activate
  "f" 'project-find-file
  "c" 'counsel-yank-pop
  "a" 'counsel-rg
  "d" 'deadgrep
  "A" 'counsel-ag)

(general-define-key
 :states '(insert normal)
 "C-y" 'counsel-yank-pop)

(defun my/swiper-isearch ()
  (interactive)
  (if current-prefix-arg
      (swiper-all)
    (swiper-isearch)))

(my-leader-def "SPC SPC" 'ivy-resume)
(my-leader-def "s" 'my/swiper-isearch)

(general-define-key
 :keymaps '(ivy-minibuffer-map swiper-map)
 "M-j" 'ivy-next-line
 "M-k" 'ivy-previous-line
 "<C-return>" 'ivy-call
 "M-RET" 'ivy-immediate-done
 [escape] 'minibuffer-keyboard-quit)
#+end_src
*** company
A completion framework for Emacs.

References:
- [[http://company-mode.github.io/][company homepage]]
- [[https://github.com/sebastiencs/company-box][company-box homepage]]

#+begin_src emacs-lisp
(use-package company
  :straight t
  :config
  (global-company-mode)
  (setq company-idle-delay 0.125)
  (setq company-dabbrev-downcase nil)
  (setq company-show-numbers t))

(general-imap "C-SPC" 'company-complete)
#+end_src

A company frontend with nice icons.

+Disabled since the base company got icons support and since company-box has some issues with spaceline.+ Enabled back because I didn't like spaceline.
#+begin_src emacs-lisp
(use-package company-box
  :straight t
  :if (display-graphic-p)
  :after (company)
  :hook (company-mode . company-box-mode))
#+end_src
** Help
- *CREDIT*: Thanks @phundrak on the System Crafters Discord for suggesting =help-map=

[[https://github.com/Wilfred/helpful][helpful]] package improves the =*help*= buffer.
#+begin_src emacs-lisp
(use-package helpful
  :straight t
  :commands (helpful-callable
             helpful-variable
             helpful-key
             helpful-macro
             helpful-function
             helpful-command))
#+end_src

As I use =C-h= to switch buffers, I moved the help to =SPC-h= with the code below.
#+begin_src emacs-lisp
(my-leader-def
  "h" '(:keymap help-map :which-key "help"))

(my-leader-def
  :infix "h"
  "" '(:which-key "help")
  "h" '(:keymap help-map :which-key "help-map")
  "f" 'helpful-function
  "k" 'helpful-key
  "v" 'helpful-variable
  "o" 'helpful-symbol
  "i" 'info)

(general-define-key
 :keymaps 'help-map
 "f" 'helpful-function
 "k" 'helpful-key
 "v" 'helpful-variable
 "o" 'helpful-symbol)
#+end_src
** Time trackers
Time trackers I happen to use.

References:
- [[https://wakatime.com][WakaTime]]
- [[https://activitywatch.net/][ActivityWatch]]

*** WakaTime
Before I figure out how to package this for Guix:
- Clone [[https://github.com/wakatime/wakatime-cli][the repo]]
- Run ~go build~
- Copy the binary to the =~/bin= folder

#+begin_src emacs-lisp :noweb yes
(use-package wakatime-mode
  :straight (:host github :repo "SqrtMinusOne/wakatime-mode")
  :if (not (or my/remote-server))
  :config
  (setq wakatime-ignore-exit-codes '(0 1 102 112))
  (advice-add 'wakatime-init :after (lambda () (setq wakatime-cli-path (expand-file-name "~/bin/wakatime-cli"))))
  ;; (setq wakatime-cli-path (executable-find "wakatime"))
  (global-wakatime-mode))
#+end_src

*** ActivityWatch
#+begin_src emacs-lisp
(use-package request
  :straight t
  :defer t)

(use-package activity-watch-mode
  :straight t
  :if (not (or my/is-termux my/remote-server))
  :config
  (global-activity-watch-mode))
#+end_src
* UI settings
** General settings
*** Miscellaneous

Disable GUI elements
#+begin_src emacs-lisp
(unless my/is-termux
  (tool-bar-mode -1)
  (menu-bar-mode -1)
  (scroll-bar-mode -1))

(when my/is-termux
  (menu-bar-mode -1))
#+end_src

Transparency. Not setting it here, as I used to use [[file:Desktop.org::*Picom][picom]] with i3, and EXWM config has its own settings.
#+begin_src emacs-lisp
;; (set-frame-parameter (selected-frame) 'alpha '(90 . 90))
;; (add-to-list 'default-frame-alist '(alpha . (90 . 90)))
#+end_src

Prettify symbols. Also not setting it, ligatures seem to be enough for me.
#+begin_src emacs-lisp
;; (global-prettify-symbols-mode)
#+end_src

Do not show GUI dialogs
#+begin_src emacs-lisp
(setq use-dialog-box nil)
#+end_src

No start screen
#+begin_src emacs-lisp
(setq inhibit-startup-screen t)
#+end_src

Visual bell
#+begin_src emacs-lisp
(setq visible-bell 0)
#+end_src

y or n instead of yes or no
#+begin_src emacs-lisp
(defalias 'yes-or-no-p 'y-or-n-p)
#+end_src

Hide mouse cursor while typing
#+begin_src emacs-lisp
(setq make-pointer-invisible t)
#+end_src

Show pairs
#+begin_src emacs-lisp
(show-paren-mode 1)
#+end_src

Highlight the current line
#+begin_src emacs-lisp
(global-hl-line-mode 1)
#+end_src
*** Line numbers
Line numbers. There seems to be a catch with the relative number setting:
- =visual= doesn't take folding into account but also doesn't take wrapped lines into account (i.e. there are multiple numbers for a single wrapped line)
- =relative= makes a single number for a wrapped line, but counts folded lines.

=visual= option seems to be less of a problem in most cases.
#+begin_src emacs-lisp
(global-display-line-numbers-mode 1)
(line-number-mode nil)
(setq display-line-numbers-type 'visual)
(column-number-mode)
#+end_src
*** Word wrapping
Word wrapping. These settings aren't too obvious compared to =:set wrap= from vim:
- =word-wrap= means just "don't split one word between two lines". So, if there isn't enough place to put a word at the end of the line, it will be put on a new one. Run =M-x toggle-word-wrap= to toggle that.
- =visual-line-mode= seems to be a superset of =word-wrap=. It also enables some editing commands to work on visual lines instead of logical ones, hence the naming.
- =auto-fill-mode= does the same as =word-wrap=, except it actually *edits the buffer* to make lines break in the appropriate places.
- =truncate-lines= truncates long lines instead of continuing them. Run =M-x toggle-truncate-lines= to toggle that. I find that =truncate-lines= behaves strangely when =visual-line-mode= is on, so I use one or another.
#+begin_src emacs-lisp
(setq word-wrap 1)
(global-visual-line-mode 1)
#+end_src
*** Custom frame format
Title format, which used to look something like =emacs:project@hostname=. Now it's just =emacs=.
#+begin_src emacs-lisp
(setq-default frame-title-format
              '(""
                "emacs"
                ;; (:eval
                ;;  (let ((project-name (projectile-project-name)))
                ;;    (if (not (string= "-" project-name))
                ;;        (format ":%s@%s" project-name (system-name))
                ;;      (format "@%s" (system-name)))))
                ))
#+end_src
*** Olivetti
[[https://github.com/rnkn/olivetti][Olivetti]] is a package that limits the current text body width. It's pretty nice to use when writing texts.

#+begin_src emacs-lisp
(use-package olivetti
  :straight t
  :if (display-graphic-p)
  :config
  (setq-default olivetti-body-width 86))
#+end_src
*** Keycast
Showing the last pressed key. Occasionally useful.

#+begin_src emacs-lisp
(use-package keycast
  :straight t
  :config
  (define-minor-mode keycast-mode
    "Keycast mode"
    :global t
    (if keycast-mode
        (progn
          (add-to-list 'global-mode-string '("" keycast-mode-line " "))
          (add-hook 'pre-command-hook 'keycast--update t) )
      (remove-hook 'pre-command-hook 'keycast--update)
      (setq global-mode-string (delete '("" keycast-mode-line " ") global-mode-string)))))
#+end_src
** Themes and colors
*** Theme packages
My colorschemes of choice.
#+begin_src emacs-lisp
(use-package doom-themes
  :straight t
  :config
  (setq doom-themes-enable-bold t
        doom-themes-enable-italic t)
  ;; (if my/remote-server
  ;;     (load-theme 'doom-gruvbox t)
  ;;   (load-theme 'doom-palenight t))
  (doom-themes-visual-bell-config)
  (setq doom-themes-treemacs-theme "doom-colors")
  (doom-themes-treemacs-config))
#+end_src

#+begin_src emacs-lisp
(use-package modus-themes
  :straight t)
#+end_src

Let's see...
#+begin_src emacs-lisp
(use-package ef-themes
  :straight t
  :config
  (setq ef-duo-light-palette-overrides
        '((constant green))))
#+end_src
*** Custom theme
Here I define a few things on the top of Emacs theme, because:
- Occasionally I want to have more theme-derived faces
- I also want Emacs theme to be applied to the rest of the system (see the [[file:Desktop.org][Desktop]] config on that)

Theme-derived faces have to placed in a custom theme, because if one calls =custom-set-faces= and =custom-set-variables= in code, whenever a variable is changed and saved in a customize buffer, data from all calls of these functions is saved as well.

**** Get color values
Here's a great package with various color tools:
#+begin_src emacs-lisp
(use-package ct
  :straight t)
#+end_src

As of now I want this to support =doom-themes= and =modus-themes=. So, let's get which one is enabled:
#+begin_src emacs-lisp
(defun my/doom-p ()
  (seq-find (lambda (x) (string-match-p (rx bos "doom") (symbol-name x)))
            custom-enabled-themes))

(defun my/modus-p ()
  (seq-find (lambda (x) (string-match-p (rx bos "modus") (symbol-name x)))
            custom-enabled-themes))

(defun my/ef-p ()
  (seq-find (lambda (x) (string-match-p (rx bos "ef") (symbol-name x)))
            custom-enabled-themes))
#+end_src

I also want to know if the current theme is light or not:
#+begin_src emacs-lisp
(defun my/light-p ()
  (ct-light-p (my/color-value 'bg)))

(defun my/dark-p ()
  (not (my/light-p)))
#+end_src

Now, let's get the current color from =doom=. =doom-themes= provide =doom-color=, but I also want to:
- override some colors
- add =black=, =white=, =light-*= and =border=
#+begin_src emacs-lisp
(defconst my/theme-override
  '((doom-palenight
     (red . "#f07178"))))

(defvar my/alpha-for-light 7)

(defun my/doom-color (color)
  (when (doom-color 'bg)
    (let ((override (alist-get (my/doom-p) my/theme-override))
          (color-name (symbol-name color))
          (is-light (ct-light-p (doom-color 'bg))))
      (or
       (alist-get color override)
       (cond
        ((eq 'black color)
         (if is-light (doom-color 'fg) (doom-color 'bg)))
        ((eq 'white color)
         (if is-light (doom-color 'bg) (doom-color 'fg)))
        ((eq 'border color)
         (if is-light (doom-color 'base0) (doom-color 'base8)))
        ((string-match-p (rx bos "light-") color-name)
         (ct-edit-hsl-l-inc (my/doom-color (intern (substring color-name 6)))
                            my/alpha-for-light))
        (t (doom-color color)))))))
#+end_src

And the same for =modus-themes=. =my/modus-color= has to accept the same arguments as I use for =my/doom-color= for backward compatibility, which requires a bit more tuning.
#+begin_src emacs-lisp
(defun my/modus-get-base (color)
  (let ((base-value (string-to-number (substring (symbol-name color) 4 5)))
        (base-start (cadr (assoc 'bg-main (modus-themes--current-theme-palette))))
        (base-end (cadr (assoc 'fg-dim (modus-themes--current-theme-palette)))))
    (nth base-value (ct-gradient 9 base-start base-end t))))

(defun my/prot-color (color palette)
  (let ((is-light (ct-light-p (cadr (assoc 'bg-main palette)))))
    (cond
     ((member color '(black white light-black light-white))
      (let ((bg-main (cadr (assoc 'bg-main palette)))
            (fg-main (cadr (assoc 'fg-main palette))))
        (pcase color
          ('black (if is-light fg-main bg-main))
          ('white (if is-light bg-main fg-main))
          ('light-black (ct-edit-hsl-l-inc
                         (if is-light fg-main bg-main)
                         15))
          ('light-white (ct-edit-hsl-l-inc
                         (if is-light bg-main fg-main)
                         15)))))
     ((or (eq color 'bg))
      (cadr (assoc 'bg-main palette)))
     ((or (eq color 'fg))
      (cadr (assoc 'fg-main palette)))
     ((eq color 'bg-alt)
      (cadr (assoc 'bg-dim palette)))
     ((eq color 'violet)
      (cadr (assoc 'magenta-cooler palette)))
     ((string-match-p (rx bos "base" digit) (symbol-name color))
      (my/modus-get-base color))
     ((string-match-p (rx bos "dark-") (symbol-name color))
      (cadr (assoc (intern (format "%s-cooler" (substring (symbol-name color) 5)))
                   palette)))
     ((eq color 'grey)
      (my/modus-get-base 'base5))
     ((string-match-p (rx bos "light-") (symbol-name color))
      (or
       (cadr (assoc (intern (format "%s-intense" (substring (symbol-name color) 6))) palette))
       (cadr (assoc (intern (format "bg-%s-intense" (substring (symbol-name color) 6))) palette))))
     (t (cadr (assoc color palette))))))

(defun my/modus-color (color)
  (my/prot-color color (modus-themes--current-theme-palette)))

(defun my/ef-color (color)
  (my/prot-color color (ef-themes--current-theme-palette)))
#+end_src

Test the three functions.
#+begin_src emacs-lisp
(defconst my/test-colors-list
  '(black red green yellow blue magenta cyan white light-black
          light-red light-green light-yellow light-blue light-magenta
          light-cyan light-white bg fg violet grey base0 base1 base2
          base3 base4 base5 base6 base7 base8 border bg-alt))

(defun my/test-colors ()
  (interactive)
  (let ((buf (generate-new-buffer "*colors-test*")))
    (with-current-buffer buf
      (insert (format "%-20s %-10s %-10s %-10s" "Color" "Doom" "Modus" "Ef") "\n")
      (cl-loop for color in my/test-colors-list
               do (insert
                   (format "%-20s %-10s %-10s %-10s\n"
                           (prin1-to-string color)
                           (my/doom-color color)
                           (my/modus-color color)
                           (my/ef-color color))))
      (special-mode)
      (rainbow-mode))
    (switch-to-buffer buf)))
#+end_src

Finally, one function to get the value of a color in the current theme.
#+begin_src emacs-lisp
(defun my/color-value (color)
  (cond
   ((stringp color) (my/color-value (intern color)))
   ((eq color 'bg-other)
    (or (my/color-value 'bg-dim)
        (let ((color (my/color-value 'bg)))
          (if (ct-light-p color)
              (ct-edit-hsl-l-dec color 2)
            (ct-edit-hsl-l-dec color 3)))))
   ((my/doom-p) (my/doom-color color))
   ((my/modus-p) (my/modus-color color))
   ((my/ef-p) (my/ef-color color))))
#+end_src

And a few more functions
**** Custom theme
So, the custom theme:
#+begin_src emacs-lisp
(deftheme my-theme-1)
#+end_src

A macro to simplify defining custom colors.
#+begin_src emacs-lisp
(defvar my/my-theme-update-color-params nil)

(defmacro my/use-colors (&rest data)
  `(progn
     ,@(cl-loop for i in data collect
                `(setf (alist-get ',(car i) my/my-theme-update-color-params)
                       (list ,@(cl-loop for (key value) on (cdr i) by #'cddr
                                        append `(,key ',value)))))
     (when (and (or (my/doom-p) (my/modus-p)) my/emacs-started)
       (my/update-my-theme))))
#+end_src

This macro puts lambdas to =my/my-theme-update-colors-hook= that updates faces in =my-theme-1=. Now I have to call this hook:
#+begin_src emacs-lisp
(defun my/update-my-theme (&rest _)
  (interactive)
  (cl-loop for (face . values) in my/my-theme-update-color-params
           do (custom-theme-set-faces
               'my-theme-1
               `(,face ((t ,@(cl-loop for (key value) on values by #'cddr
                                      collect key
                                      collect (eval value)))))))
  (enable-theme 'my-theme-1))

(unless my/is-termux
  (advice-add 'load-theme :after #'my/update-my-theme)
  (add-hook 'emacs-startup-hook #'my/update-my-theme))
#+end_src

Defining colors for =tab-bar.el=:
#+begin_src emacs-lisp
(my/use-colors
 (tab-bar-tab :background (my/color-value 'bg)
              :foreground (my/color-value 'yellow)
              :underline (my/color-value 'yellow))
 (tab-bar :background nil :foreground nil)
 (magit-section-secondary-heading :foreground (my/color-value 'blue)
                                  :weight 'bold))
#+end_src
**** Switch theme
The built-in =load-theme= does not deactivate the previous theme, so here's a function that does that:

#+begin_src emacs-lisp
(defun my/switch-theme (theme)
  (interactive
   (list (intern (completing-read "Load custom theme: "
                                  (mapcar #'symbol-name
				                          (custom-available-themes))))))
  (cl-loop for enabled-theme in custom-enabled-themes
           if (not (or (eq enabled-theme 'my-theme-1)
                       (eq enabled-theme theme)))
           do (disable-theme enabled-theme))
  (load-theme theme t)
  (when current-prefix-arg
    (my/regenerate-desktop)))
#+end_src

#+begin_src emacs-lisp
(my/switch-theme 'ef-duo-light)
#+end_src
*** Dim inactive buffers
Dim inactive buffers.
#+begin_src emacs-lisp
(use-package auto-dim-other-buffers
  :straight t
  :if (display-graphic-p)
  :config
  (auto-dim-other-buffers-mode t)
  (my/use-colors
   (auto-dim-other-buffers-face
    :background (my/color-value 'bg-other))))
#+end_src
*** ANSI colors
=ansi-color.el= is a built-in Emacs package that translates ANSI color escape codes into faces.

It is used by many other packages but doesn't seem to have an integration with =doom-themes=, so here is one.

#+begin_src emacs-lisp
(with-eval-after-load 'ansi-color
  (my/use-colors
   (ansi-color-black
    :foreground (my/color-value 'base2) :background (my/color-value 'base0))
   (ansi-color-red
    :foreground (my/color-value 'red) :background (my/color-value 'red))
   (ansi-color-green
    :foreground (my/color-value 'green) :background (my/color-value 'green))
   (ansi-color-yellow
    :foreground (my/color-value 'yellow) :background (my/color-value 'yellow))
   (ansi-color-blue
    :foreground (my/color-value 'dark-blue) :background (my/color-value 'dark-blue))
   (ansi-color-magenta
    :foreground (my/color-value 'violet) :background (my/color-value 'violet))
   (ansi-color-cyan
    :foreground (my/color-value 'dark-cyan) :background (my/color-value 'dark-cyan))
   (ansi-color-white
    :foreground (my/color-value 'base8) :background (my/color-value 'base8))
   (ansi-color-bright-black
    :foreground (my/color-value 'base5) :background (my/color-value 'base5))
   (ansi-color-bright-red
    :foreground (my/color-value 'orange) :background (my/color-value 'orange))
   (ansi-color-bright-green
    :foreground (my/color-value 'teal) :background (my/color-value 'teal))
   (ansi-color-bright-yellow
    :foreground (my/color-value 'yellow) :background (my/color-value 'yellow))
   (ansi-color-bright-blue
    :foreground (my/color-value 'blue) :background (my/color-value 'blue))
   (ansi-color-bright-magenta
    :foreground (my/color-value 'magenta) :background (my/color-value 'magenta))
   (ansi-color-bright-cyan
    :foreground (my/color-value 'cyan) :background (my/color-value 'cyan))
   (ansi-color-bright-white
    :foreground (my/color-value 'fg) :background (my/color-value 'fg))))
#+end_src
** Fonts
*** Frame font
To install a font, download the font and unpack it into the =.local/share/fonts= directory. Create one if it doesn't exist.

As I use nerd fonts elsewhere, I use one in Emacs as well.

References:
- [[https://nerdfonts.com][nerd fonts homepage]]

#+begin_src emacs-lisp
(when (display-graphic-p)
  (if (x-list-fonts "JetBrainsMono Nerd Font")
      (let ((font "-JB  -JetBrainsMono Nerd Font-medium-normal-normal-*-17-*-*-*-m-0-iso10646-1"))
        (set-frame-font font nil t)
        (add-to-list 'default-frame-alist `(font . ,font)))
    (message "Install JetBrainsMono Nerd Font!")))
#+end_src

To make the icons work (e.g. in the Doom Modeline), run =M-x all-the-icons-install-fonts=. The package definition is somewhere later in the config.
*** Other fonts
#+begin_src emacs-lisp
(when (display-graphic-p)
  (set-face-attribute 'variable-pitch nil :family "Cantarell" :height 1.0)
  (set-face-attribute
   'italic nil
   :family "JetBrainsMono Nerd Font"
   :weight 'regular
   :slant 'italic))
#+end_src
*** Ligatures
Ligature setup for the JetBrainsMono font.
#+begin_src emacs-lisp
(use-package ligature
  :straight (:host github :repo "mickeynp/ligature.el")
  :if (display-graphic-p)
  :config
  (ligature-set-ligatures
   '(
     typescript-mode
     typescript-ts-mode
     js2-mode
     javascript-ts-mode
     vue-mode
     svelte-mode
     scss-mode
     php-mode
     python-mode
     python-ts-mode
     js-mode
     markdown-mode
     clojure-mode
     go-mode
     sh-mode
     haskell-mode
     web-mode)
   '("--" "---" "==" "===" "!=" "!==" "=!=" "=:=" "=/=" "<="
     ">=" "&&" "&&&" "&=" "++" "+++" "***" ";;" "!!" "??"
     "?:" "?." "?=" "<:" ":<" ":>" ">:" "<>" "<<<" ">>>"
     "<<" ">>" "||" "-|" "_|_" "|-" "||-" "|=" "||=" "##"
     "###" "####" "#{" "#[" "]#" "#(" "#?" "#_" "#_(" "#:"
     "#!" "#=" "^=" "<$>" "<$" "$>" "<+>" "<+" "+>" "<*>"
     "<*" "*>" "</" "</>" "/>" "<!--" "<#--" "-->" "->" "->>"
     "<<-" "<-" "<=<" "=<<" "<<=" "<==" "<=>" "<==>" "==>" "=>"
     "=>>" ">=>" ">>=" ">>-" ">-" ">--" "-<" "-<<" ">->" "<-<"
     "<-|" "<=|" "|=>" "|->" "<->" "<~~" "<~" "<~>" "~~" "~~>"
     "~>" "~-" "-~" "~@" "[||]" "|]" "[|" "|}" "{|" "[<"
     ">]" "|>" "<|" "||>" "<||" "|||>" "<|||" "<|>" "..." ".."
     ".=" ".-" "..<" ".?" "::" ":::" ":=" "::=" ":?" ":?>"
     "//" "///" "/*" "*/" "/=" "//=" "/==" "@_" "__"))
  (global-ligature-mode t))
#+end_src
*** Icons
Run =M-x all-the-icons-install-fonts= at first setup.

#+begin_src emacs-lisp
(use-package all-the-icons
  :if (display-graphic-p)
  :straight t)
#+end_src
** Text highlight
Highlight indent guides.
#+begin_src emacs-lisp
(use-package highlight-indent-guides
  :straight t
  :if (not (or my/remote-server))
  :hook ((prog-mode . highlight-indent-guides-mode)
         (LaTeX-mode . highlight-indent-guides-mode))
  :config
  (setq highlight-indent-guides-method 'bitmap)
  (setq highlight-indent-guides-bitmap-function 'highlight-indent-guides--bitmap-line))
#+end_src

Rainbow parentheses.
#+begin_src emacs-lisp
(use-package rainbow-delimiters
  :straight t
  :hook ((prog-mode . rainbow-delimiters-mode)))
#+end_src

Highlight colors
#+begin_src emacs-lisp
(use-package rainbow-mode
  :commands (rainbow-mode)
  :straight t)
#+end_src

Highlight TODOs and stuff
#+begin_src emacs-lisp
(use-package hl-todo
  :hook (prog-mode . hl-todo-mode)
  :straight t)
#+end_src
** Doom Modeline
A modeline from Doom Emacs. A big advantage of this package is that it just works out of the box and does not require much customization.

I tried a bunch of other options, including [[https://github.com/TheBB/spaceline][spaceline]], but in the end, decided that Doom Modeline works best for me.

References:
- [[https://github.com/seagle0128/doom-modeline][Doom Modeline]]

#+begin_src emacs-lisp
(use-package doom-modeline
  :straight t
  ;; :if (not (display-graphic-p))
  :init
  (setq doom-modeline-env-enable-python nil)
  (setq doom-modeline-env-enable-go nil)
  (setq doom-modeline-buffer-encoding 'nondefault)
  (setq doom-modeline-hud t)
  (setq doom-modeline-persp-icon nil)
  (setq doom-modeline-persp-name nil)
  (setq doom-modeline-display-misc-in-all-mode-lines nil)
  :config
  (setq doom-modeline-minor-modes nil)
  (setq doom-modeline-irc nil)
  (setq doom-modeline-buffer-state-icon nil)
  (doom-modeline-mode 1))
#+end_src
** perspective.el
[[https://github.com/nex3/perspective-el][perspective.el]] is a package that groups buffers in "perspectives".

=tab-bar.el= can be configured to behave in a similar way, but I'm too invested in this package already.

One thing I don't like is that the list perspectives is displayed in the modeline, but I'll probably look how to move them to the bar at the top of the frame at some point.

#+begin_src emacs-lisp
(use-package perspective
  :straight t
  :init
  ;; (setq persp-show-modestring 'header)
  (setq persp-sort 'created)
  (setq persp-suppress-no-prefix-key-warning t)
  :config
  (persp-mode)
  (my-leader-def "x" '(:keymap perspective-map :which-key "perspective"))
  (general-define-key
   :keymaps 'override
   :states '(normal emacs)
   "gt" 'persp-next
   "gT" 'persp-prev
   "gn" 'persp-switch
   "gN" 'persp-kill)
  (general-define-key
   :keymaps 'perspective-map
   "b" 'persp-ivy-switch-buffer
   "x" 'persp-ivy-switch-buffer
   "u" 'persp-ibuffer))
#+end_src
*** Functions to manage buffers
Move the current buffer to a perspective and switch to it.
#+begin_src emacs-lisp
(defun my/persp-move-window-and-switch ()
  (interactive)
  (let* ((buffer (current-buffer)))
    (call-interactively #'persp-switch)
    (persp-set-buffer (buffer-name buffer))
    (switch-to-buffer buffer)))
#+end_src

Copy the current buffer to a perspective and switch to it.
#+begin_src emacs-lisp
(defun my/persp-copy-window-and-switch ()
  (interactive)
  (let* ((buffer (current-buffer)))
    (call-interactively #'persp-switch)
    (persp-add-buffer (buffer-name buffer))
    (switch-to-buffer buffer)))
#+end_src

Switch to a perspective buffer in other window.
#+begin_src emacs-lisp
(defun my/persp-ivy-switch-buffer-other-window (arg)
  (interactive "P")
  (declare-function ivy-switch-buffer-other-window "ivy.el")
  (persp--switch-buffer-ivy-counsel-helper
   arg
   (lambda ()
     (ivy-read "Switch to buffer in other window: " #'internal-complete-buffer
               :keymap ivy-switch-buffer-map
               :preselect (buffer-name (other-buffer (current-buffer)))
               :action #'ivy--switch-buffer-other-window-action
               :matcher #'ivy--switch-buffer-matcher
               :caller 'ivy-switch-buffer))))
#+end_src

Add keybindings to the default map.
#+begin_src emacs-lisp
(with-eval-after-load 'perspective
  (general-define-key
   :keymaps 'perspective-map
   "m" #'my/persp-move-window-and-switch
   "f" #'my/persp-copy-window-and-switch))
#+end_src
*** Automating perspectives
Out-of-the-box, =perspective.el= doesn't feature much (or any) capacity for automation. We're supposed to manually assign buffers to perspectives, which kinda makes sense... But I still want automation.

First, let's define a variable with "rules":
#+begin_src emacs-lisp
(setq my/perspective-assign-alist '())
#+end_src

One rule looks as follows:
#+begin_example
(major-mode workspace-index persp-name)
#+end_example

And a function to act on these rules.
#+begin_src emacs-lisp
(defvar my/perspective-assign-ignore nil
  "If non-nil, ignore `my/perspective-assign'")

(defun my/perspective-assign ()
  (when-let* ((_ (not my/perspective-assign-ignore))
              (rule (alist-get major-mode my/perspective-assign-alist)))
    (let ((workspace-index (car rule))
          (persp-name (cadr rule))
          (buffer (current-buffer)))
      (if (fboundp #'perspective-exwm-assign-window)
          (progn
            (perspective-exwm-assign-window
             :workspace-index workspace-index
             :persp-name persp-name)
            (when workspace-index
              (exwm-workspace-switch workspace-index))
            (when persp-name
              (persp-switch persp-name)))
        (with-perspective persp-name
          (persp-set-buffer buffer))
        (persp-switch-to-buffer buffer)))))
#+end_src

Also advise to ignore the assignment:
#+begin_src emacs-lisp
(defun my/perspective-assign-ignore-advice (fun &rest args)
  (let ((my/perspective-assign-ignore t))
    (apply fun args)))
#+end_src

If EXWM is available, then so is mine =perspective-exwm= package, which features a convenient procedure called =perspective-exwm-assign-window=. Otherwise, we just work with perspectives.

Now, we have to put this function somewhere, and =after-change-major-mode-hook= seems like a perfect place for it.
#+begin_src emacs-lisp
(add-hook 'after-change-major-mode-hook #'my/perspective-assign)
#+end_src

And here is a simple macro to add rules to the list.
#+begin_src emacs-lisp
(defmacro my/persp-add-rule (&rest body)
  (declare (indent 0))
  (unless (= (% (length body) 3) 0)
    (error "Malformed body in my/persp-add-rule"))
  (let (result)
    (while body
      (let ((major-mode (pop body))
            (workspace-index (pop body))
            (persp-name (pop body)))
        (push
         `(add-to-list 'my/perspective-assign-alist
                       '(,major-mode . (,workspace-index ,persp-name)))
         result)))
    `(progn
       ,@result)))
#+end_src

Also, the logic above works only for cases when the buffer is created. Occasionally, packages run =switch-to-buffer=, which screws both EXWM workspaces and perspectives; to work around that, I define a macro that runs a command in the context of a given perspective and workspace.
#+begin_src emacs-lisp
(defmacro my/command-in-persp (command-name persp-name workspace-index &rest args)
  `'((lambda ()
       (interactive)
       (when (and ,workspace-index (fboundp #'exwm-workspace-switch-create))
         (exwm-workspace-switch-create ,workspace-index))
       (persp-switch ,persp-name)
       (delete-other-windows)
       ,@args)
     :wk ,command-name))
#+end_src

This is meant to be used in the definitions of =general.el=.
* Programming
** General setup
*** Treemacs
[[https://github.com/Alexander-Miller/treemacs][Treemacs]] is a rather large & powerful package, but as of now I've replaced it with dired. I still have a small configuration because lsp-mode and dap-mode depend on it.

#+begin_src emacs-lisp
(use-package treemacs
  :straight t
  :defer t
  :config
  ;; (setq treemacs-follow-mode nil)
  ;; (setq treemacs-follow-after-init nil)
  (setq treemacs-space-between-root-nodes nil)
  ;; (treemacs-git-mode 'extended)
  ;; (add-to-list 'treemacs-pre-file-insert-predicates #'treemacs-is-file-git-ignored?)
  (general-define-key
   :keymaps 'treemacs-mode-map
   [mouse-1] #'treemacs-single-click-expand-action
   "M-l" #'treemacs-root-down
   "M-h" #'treemacs-root-up
   "q" #'treemacs-quit)
  (general-define-key
   :keymaps 'treemacs-mode-map
   :states '(normal emacs)
   "q" 'treemacs-quit))

(use-package treemacs-evil
  :after (treemacs evil)
  :straight t)
#+end_src
*** LSP
LSP-mode provides an IDE-like experience for Emacs - real-time diagnostics, code actions, intelligent autocompletion, etc.

References:
- [[https://emacs-lsp.github.io/lsp-mode/][lsp-mode homepage]]

**** Setup
#+begin_src emacs-lisp
(use-package lsp-mode
  :straight t
  :if (not (or my/slow-ssh my/is-termux my/remote-server))
  :hook (
         (typescript-mode . lsp)
         (js-mode . lsp)
         (vue-mode . lsp)
         (go-mode . lsp)
         (svelte-mode . lsp)
         ;; (python-mode . lsp)
         (json-mode . lsp)
         (haskell-mode . lsp)
         (haskell-literate-mode . lsp)
         (java-mode . lsp)
         ;; (csharp-mode . lsp)
         )
  :commands lsp
  :init
  (setq lsp-keymap-prefix nil)
  :config
  (setq lsp-idle-delay 1)
  (setq lsp-eslint-server-command '("node" "/home/pavel/.emacs.d/.cache/lsp/eslint/unzipped/extension/server/out/eslintServer.js" "--stdio"))
  (setq lsp-eslint-run "onSave")
  (setq lsp-signature-render-documentation nil)
  ;; (lsp-headerline-breadcrumb-mode nil)
  (setq lsp-headerline-breadcrumb-enable nil)
  (setq lsp-modeline-code-actions-enable nil)
  (setq lsp-modeline-diagnostics-enable nil)
  (add-to-list 'lsp-language-id-configuration '(svelte-mode . "svelte")))

(use-package lsp-ui
  :straight t
  :commands lsp-ui-mode
  :config
  (setq lsp-ui-doc-delay 2)
  (setq lsp-ui-sideline-show-hover nil))
#+end_src

#+RESULTS:
: t

**** Integrations
The only integration left now is treemacs.

Origami should've leveraged LSP folding, but it was too unstable at the moment I tried it.
#+begin_src emacs-lisp
;; (use-package helm-lsp
;;   :straight t
;;   :commands helm-lsp-workspace-symbol)

;; (use-package origami
;;   :straight t
;;   :hook (prog-mode . origami-mode))

;; (use-package lsp-origami
;;   :straight t
;;   :config
;;   (add-hook 'lsp-after-open-hook #'lsp-origami-try-enable))

(use-package lsp-treemacs
  :after (lsp)
  :straight t
  :commands lsp-treemacs-errors-list)
#+end_src
**** Keybindings
#+begin_src emacs-lisp
(my-leader-def
  :infix "l"
  "" '(:which-key "lsp")
  "d" 'lsp-ui-peek-find-definitions
  "r" 'lsp-rename
  "u" 'lsp-ui-peek-find-references
  "s" 'lsp-ui-find-workspace-symbol
  "l" 'lsp-execute-code-action
  "e" 'list-flycheck-errors)
#+end_src
**** UI
I don't like how some LSPs print the full filename in the progress indicator.

#+begin_src emacs-lisp
(defun my/lsp--progress-status ()
  "Returns the status of the progress for the current workspaces."
  (-let ((progress-status
          (s-join
           "|"
           (-keep
            (lambda (workspace)
              (let ((tokens (lsp--workspace-work-done-tokens workspace)))
                (unless (ht-empty? tokens)
                  (mapconcat
                   (-lambda ((&WorkDoneProgressBegin :message? :title :percentage?))
                     (concat (if percentage?
                                 (if (numberp percentage?)
                                     (format "%.0f%%%% " percentage?)
                                   (format "%s%%%% " percentage?))
                               "")
                             (let ((msg (url-unhex-string (or message\? title))))
                               (if (string-match-p "\\`file:///" msg)
                                   (file-name-nondirectory msg)))))
                   (ht-values tokens)
                   "|"))))
            (lsp-workspaces)))))
    (unless (s-blank? progress-status)
      (concat lsp-progress-prefix progress-status))))

(with-eval-after-load 'lsp-mode
  (advice-add 'lsp--progress-status :override #'my/lsp--progress-status))
#+end_src
*** Flycheck
A syntax checking extension for Emacs. Integrates with LSP-mode, but can also use various standalone checkers.

References:
- [[https://www.flycheck.org/en/latest/][Flycheck homepage]]

#+begin_src emacs-lisp
(use-package flycheck
  :straight t
  :config
  (global-flycheck-mode)
  (setq flycheck-check-syntax-automatically '(save idle-buffer-switch mode-enabled))
  ;; (add-hook 'evil-insert-state-exit-hook
  ;;           (lambda ()
  ;;             (if flycheck-checker
  ;;                 (flycheck-buffer))
  ;;             ))
  (advice-add 'flycheck-eslint-config-exists-p :override (lambda() t))
  (add-to-list 'display-buffer-alist
               `(,(rx bos "*Flycheck errors*" eos)
                 (display-buffer-reuse-window
                  display-buffer-in-side-window)
                 (side            . bottom)
                 (reusable-frames . visible)
                 (window-height   . 0.33))))
#+end_src
*** General additional config
Have to put this before tree-sitter because I need =my/set-smartparens-indent= there.

Make smartparens behave the way I like for C-like languages.
#+begin_src emacs-lisp
(defun my/set-smartparens-indent (mode)
  (sp-local-pair mode "{" nil :post-handlers '(("|| " "SPC") ("||\n[i]" "RET")))
  (sp-local-pair mode "[" nil :post-handlers '(("|| " "SPC") ("||\n[i]" "RET")))
  (sp-local-pair mode "(" nil :post-handlers '(("|| " "SPC") ("||\n[i]" "RET"))))
#+end_src

Override flycheck checker with eslint.
#+begin_src emacs-lisp
(defun my/set-flycheck-eslint()
  "Override flycheck checker with eslint."
  (setq-local lsp-diagnostic-package :none)
  (setq-local flycheck-checker 'javascript-eslint))
#+end_src
*** Tree Sitter
Tree-Sitter integration with Emacs 29.

References:
- [[https://www.masteringemacs.org/article/how-to-get-started-tree-sitter][How to Get Started with Tree-Sitter - Mastering Emacs]]

#+begin_src emacs-lisp
(use-package treesit
  :straight (:type built-in)
  :if (featurep 'treesit)
  :config
  (setq treesit-language-source-alist
        '((bash "https://github.com/tree-sitter/tree-sitter-bash")
          (cmake "https://github.com/uyha/tree-sitter-cmake")
          (css "https://github.com/tree-sitter/tree-sitter-css")
          (elisp "https://github.com/Wilfred/tree-sitter-elisp")
          (go "https://github.com/tree-sitter/tree-sitter-go")
          (html "https://github.com/tree-sitter/tree-sitter-html")
          (javascript "https://github.com/tree-sitter/tree-sitter-javascript" "master" "src")
          (json "https://github.com/tree-sitter/tree-sitter-json")
          (make "https://github.com/alemuller/tree-sitter-make")
          (markdown "https://github.com/ikatyang/tree-sitter-markdown")
          (python "https://github.com/tree-sitter/tree-sitter-python")
          (toml "https://github.com/tree-sitter/tree-sitter-toml")
          (tsx "https://github.com/tree-sitter/tree-sitter-typescript" "master" "tsx/src")
          (typescript "https://github.com/tree-sitter/tree-sitter-typescript" "master" "typescript/src")
          (yaml "https://github.com/ikatyang/tree-sitter-yaml")))
  (setq treesit-font-lock-level 4)
  (setq major-mode-remap-alist
        '((typescript-mode . typescript-ts-mode)
          (js-mode . javascript-ts-mode)
          (python-mode . python-ts-mode)
          (json-mode . json-ts-mode)))
  (cl-loop for (old-mode . new-mode) in major-mode-remap-alist
           do (my/set-smartparens-indent new-mode)
           do (set (intern (concat (symbol-name new-mode) "-hook"))
                   (list
                    (eval `(lambda ()
                             (run-hooks
                              ',(intern (concat (symbol-name old-mode) "-hook")))))))))
#+end_src
*** DAP
An Emacs client for Debugger Adapter Protocol.

Okay, so, I tried to use it many times... Chrome DevTools and ipdb / pudb are just better for me. Maybe I'll check out RealGUD instead... Will see.

References:
- [[https://emacs-lsp.github.io/dap-mode/][dap-mode homepage]]
#+begin_src emacs-lisp
(use-package dap-mode
  :straight t
  :if (not (or my/remote-server my/is-termux))
  :commands (dap-debug)
  :init
  (setq lsp-enable-dap-auto-configure nil)
  :config

  (setq dap-ui-variable-length 100)
  (setq dap-auto-show-output nil)
  (require 'dap-node)
  (dap-node-setup)

  (require 'dap-chrome)
  (dap-chrome-setup)

  (require 'dap-python)
  (require 'dap-php)

  (dap-mode 1)
  (dap-ui-mode 1)
  (dap-tooltip-mode 1)
  (tooltip-mode 1))
#+end_src

**** Controls
I don't like some keybindings in the built-in hydra, and there seems to be no easy way to modify the existing hydra, so I create my own. I tried to use transient, but the transient buffer seems to conflict with special buffers of DAP, and hydra does not.

Also, I want the hydra to toggle UI windows instead of just opening them, so here is a macro that defines such functions:
#+begin_src emacs-lisp
(with-eval-after-load 'dap-mode
  (defmacro my/define-dap-ui-window-toggler (name)
    `(defun ,(intern (concat "my/dap-ui-toggle-" name)) ()
       ,(concat "Toggle DAP " name "buffer")
       (interactive)
       (if-let (window (get-buffer-window ,(intern (concat "dap-ui--" name "-buffer"))))
           (quit-window nil window)
         (,(intern (concat "dap-ui-" name))))))

  (my/define-dap-ui-window-toggler "locals")
  (my/define-dap-ui-window-toggler "expressions")
  (my/define-dap-ui-window-toggler "sessions")
  (my/define-dap-ui-window-toggler "breakpoints")
  (my/define-dap-ui-window-toggler "repl"))
#+end_src

And here is the hydra:
#+begin_src emacs-lisp
(defhydra my/dap-hydra (:color pink :hint nil :foreign-keys run)
  "
^Stepping^         ^UI^                     ^Switch^                   ^Breakpoints^         ^Debug^                     ^Expressions
^^^^^^^^------------------------------------------------------------------------------------------------------------------------------------------
_n_: Next          _uc_: Controls           _ss_: Session              _bb_: Toggle          _dd_: Debug                 _ee_: Eval
_i_: Step in       _ue_: Expressions        _st_: Thread               _bd_: Delete          _dr_: Debug recent          _er_: Eval region
_o_: Step out      _ul_: Locals             _sf_: Stack frame          _ba_: Add             _dl_: Debug last            _es_: Eval thing at point
_c_: Continue      _ur_: REPL               _su_: Up stack frame       _bc_: Set condition   _de_: Edit debug template   _ea_: Add expression
_r_: Restart frame _uo_: Output             _sd_: Down stack frame     _bh_: Set hit count   _Q_:  Disconnect            _ed_: Remove expression
                 _us_: Sessions           _sF_: Stack frame filtered _bl_: Set log message                           _eu_: Refresh expressions
                 _ub_: Breakpoints                                                                               "

  ("n" dap-next)
  ("i" dap-step-in)
  ("o" dap-step-out)
  ("c" dap-continue)
  ("r" dap-restart-frame)
  ("uc" dap-ui-controls-mode)
  ("ue" my/dap-ui-toggle-expressions)
  ("ul" my/dap-ui-toggle-locals)
  ("ur" my/dap-ui-toggle-repl)
  ("uo" dap-go-to-output-buffer)
  ("us" my/dap-ui-toggle-sessions)
  ("ub" my/dap-ui-toggle-breakpoints)
  ("ss" dap-switch-session)
  ("st" dap-switch-thread)
  ("sf" dap-switch-stack-frame)
  ("sF" my/dap-switch-stack-frame)
  ("su" dap-up-stack-frame)
  ("sd" dap-down-stack-frame)
  ("bb" dap-breakpoint-toggle)
  ("ba" dap-breakpoint-add)
  ("bd" dap-breakpoint-delete)
  ("bc" dap-breakpoint-condition)
  ("bh" dap-breakpoint-hit-condition)
  ("bl" dap-breakpoint-log-message)
  ("dd" dap-debug)
  ("dr" dap-debug-recent)
  ("dl" dap-debug-last)
  ("de" dap-debug-edit-template)
  ("ee" dap-eval)
  ("ea" dap-ui-expressions-add)
  ("er" dap-eval-region)
  ("es" dap-eval-thing-at-point)
  ("ed" dap-ui-expressions-remove)
  ("eu" dap-ui-expressions-refresh)
  ("q" nil "quit" :color blue)
  ("Q" dap-disconnect :color red))

(my-leader-def "d" #'my/dap-hydra/body)
#+end_src
**** UI Fixes
There are some problems with DAP UI in my setup.

First, DAP uses Treemacs buffers quite extensively, and they hide the doom modeline for some reason, so I can't tell which buffer is active and can't see borders between buffers.

Second, lines are truncated in some strange way, but calling =toggle-truncate-lines= seems to fix that.

So I define a macro that creates a function that I can further use in advices.

#+begin_src emacs-lisp
(defvar my/dap-mode-buffer-fixed nil)

(with-eval-after-load 'dap-mode
  (defmacro my/define-dap-tree-buffer-fixer (buffer-var buffer-name)
    `(defun ,(intern (concat "my/fix-dap-ui-" buffer-name "-buffer")) (&rest _)
       (with-current-buffer ,buffer-var
         (unless my/dap-mode-buffer-fixed
           (toggle-truncate-lines 1)
           (doom-modeline-set-modeline 'info)
           (setq-local my/dap-mode-buffer-fixed t)))))

  (my/define-dap-tree-buffer-fixer dap-ui--locals-buffer "locals")
  (my/define-dap-tree-buffer-fixer dap-ui--expressions-buffer "expressions")
  (my/define-dap-tree-buffer-fixer dap-ui--sessions-buffer "sessions")
  (my/define-dap-tree-buffer-fixer dap-ui--breakpoints-buffer "breakpoints")

  (advice-add 'dap-ui-locals :after #'my/fix-dap-ui-locals-buffer)
  (advice-add 'dap-ui-expressions :after #'my/fix-dap-ui-expressions-buffer)
  (advice-add 'dap-ui-sessions :after #'my/fix-dap-ui-sessions-buffer)
  (advice-add 'dap-ui-breakpoints :after #'my/fix-dap-ui-breakpoints-buffer))
#+end_src
**** Helper functions
Some helper functions that make debugging with DAP easier.

DAP seems to mess with window parameters from time to time. This function clears "bad" window parameters.
#+begin_src emacs-lisp
(defun my/clear-bad-window-parameters ()
  "Clear window parameters that interrupt my workflow."
  (interactive)
  (let ((window (get-buffer-window (current-buffer))))
    (set-window-parameter window 'no-delete-other-windows nil)))
#+end_src

A function to kill a value from a treemacs node.
#+begin_src emacs-lisp
(defun my/dap-yank-value-at-point (node)
  (interactive (list (treemacs-node-at-point)))
  (kill-new (message (plist-get (button-get node :item) :value))))
#+end_src

A function to open a value from a treemacs node in a new buffer.
#+begin_src emacs-lisp
(defun my/dap-display-value (node)
  (interactive (list (treemacs-node-at-point)))
  (let ((value (plist-get (button-get node :item) :value)))
    (when value
      (let ((buffer (generate-new-buffer "dap-value")))
        (with-current-buffer buffer
          (insert value))
        (select-window (display-buffer buffer))))))
#+end_src
**** Switch to stack frame with filter
One significant improvement over Chrome Inspector for my particular stack is an ability to filter the stack frame list, for instance, to see only frames that relate to my current project.

So, here are functions that customize the filters:
#+begin_src emacs-lisp
(with-eval-after-load 'dap-mode
  (setq my/dap-stack-frame-filters
        `(("node_modules,node:internal" . ,(rx (or "node_modules" "node:internal")))
          ("node_modules" . ,(rx (or "node_modules")))
          ("node:internal" . ,(rx (or "node:internal")))))

  (setq my/dap-stack-frame-current-filter (cdar my/dap-stack-frame-filters))

  (defun my/dap-stack-frame-filter-set ()
    (interactive)
    (setq my/dap-stack-frame-current-filter
          (cdr
           (assoc
            (completing-read "Filter: " my/dap-stack-frame-filters)
            my/dap-stack-frame-filters))))

  (defun my/dap-stack-frame-filter (frame)
    (when-let (path (dap--get-path-for-frame frame))
      (not (string-match my/dap-stack-frame-current-filter path)))))
#+end_src

And here is a version of =dap-switch-stack-frame= that uses the said filter.
#+begin_src emacs-lisp
(defun my/dap-switch-stack-frame ()
  "Switch stackframe by selecting another stackframe stackframes from current thread."
  (interactive)
  (when (not (dap--cur-session))
    (error "There is no active session"))

  (-if-let (thread-id (dap--debug-session-thread-id (dap--cur-session)))
      (-if-let (stack-frames
                (gethash
                 thread-id
                 (dap--debug-session-thread-stack-frames (dap--cur-session))))
          (let* ((index 0)
                 (stack-framces-filtered
                  (-filter
                   #'my/dap-stack-frame-filter
                   stack-frames))
                 (new-stack-frame
                  (dap--completing-read
                   "Select active frame: "
                   stack-framces-filtered
                   (-lambda ((frame &as &hash "name"))
                     (if-let (frame-path (dap--get-path-for-frame frame))
                         (format "%s: %s (in %s)"
                                 (cl-incf index) name frame-path)
                       (format "%s: %s" (cl-incf index) name)))
                   nil
                   t)))
            (dap--go-to-stack-frame (dap--cur-session) new-stack-frame))
        (->> (dap--cur-session)
             dap--debug-session-name
             (format "Current session %s is not stopped")
             error))
    (error "No thread is currently active %s" (dap--debug-session-name (dap--cur-session)))))
#+end_src
**** Smarter switch to stack frame
- *CREDIT*: Thanks @yyoncho on the Emacs LSP Discord for helping me with this!

By default, when a breakpoint is hit, dap always pop us the buffer in the active EXWM workspace and in the active perspective. I'd like it to switch to an existing buffer instead.

So first we need to locate EXWM workspace for the file with =path=:
#+begin_src emacs-lisp
(defun my/exwm-perspective-find-buffer (path)
  "Find a buffer with PATH in all EXWM perspectives.

Returns (<buffer> . <workspace-index>) or nil."
  (let* ((buf (cl-loop for buf being buffers
                       if (and (buffer-file-name buf)
                               (f-equal-p (buffer-file-name buf) path))
                       return buf))
         (target-workspace
          (and buf
               (cl-loop for frame in exwm-workspace--list
                        if (with-selected-frame frame
                             (cl-loop for persp-name being the hash-keys of (perspectives-hash)
                                      if (member buf (persp-buffers
                                                      (gethash persp-name (perspectives-hash))))
                                      return persp-name))
                        return (cl-position frame exwm-workspace--list)))))
    (when target-workspace (cons buf target-workspace))))
#+end_src

And override =dap--go-to-stack-frame= to take that into account. For some reason, evaluating this before =dap-mode= doesn't work.

#+begin_src emacs-lisp
(defun my/dap--go-to-stack-frame-override (debug-session stack-frame)
  "Make STACK-FRAME the active STACK-FRAME of DEBUG-SESSION."
  (with-lsp-workspace (dap--debug-session-workspace debug-session)
    (when stack-frame
      (-let* (((&hash "line" line "column" column "name" name) stack-frame)
              (path (dap--get-path-for-frame stack-frame)))
        (setf (dap--debug-session-active-frame debug-session) stack-frame)
        ;; If we have a source file with path attached, open it and
        ;; position the point in the line/column referenced in the
        ;; stack trace.
        (if (and path (file-exists-p path))
            (progn
              (let ((exwm-target (my/exwm-perspective-find-buffer path)))
                (if exwm-target
                    (progn
                      (unless (= (cdr exwm-target) exwm-workspace-current-index)
                        (exwm-workspace-switch (cdr exwm-target)))
                      (persp-switch-to-buffer (car exwm-target)))
                  (select-window (get-mru-window (selected-frame) nil))
                  (find-file path)))
              (goto-char (point-min))
              (forward-line (1- line))
              (forward-char column))
          (message "No source code for %s. Cursor at %s:%s." name line column))))
    (run-hook-with-args 'dap-stack-frame-changed-hook debug-session)))

(with-eval-after-load 'exwm
  (with-eval-after-load 'dap-mode
    (advice-add #'dap--go-to-stack-frame :override #'my/dap--go-to-stack-frame-override)))

;; (advice-remove #'dap--go-to-stack-frame #'my/dap--go-to-stack-frame-override)
#+end_src
**** Debug templates
Some debug templates I frequently use.

#+begin_src emacs-lisp
(with-eval-after-load 'dap-mode
  (dap-register-debug-template
   "Node::Nest.js"
   (list :type "node"
         :request "attach"
         :name "Node::Attach"
         :port 9229
         :outFiles ["${workspaceFolder}/dist/**/*.js"]
         :sourceMaps t
         :program "${workspaceFolder}/src/app.ts"))
  (dap-register-debug-template
   "Node::Babel"
   (list :type "node"
         :request "attach"
         :name "Node::Attach"
         :port 9229
         :program "${workspaceFolder}/dist/bin/www.js")))
#+end_src
*** Reformatter
A general-purpose package to run formatters on files. While the most popular formatters are already packaged for Emacs, those that aren't can be invoked with this package.

#+begin_src emacs-lisp
(use-package reformatter
  :straight t)
#+end_src
*** copilot
[[https://copilot.github.com/][GitHub Copilot]] is a project of GitHub and OpenAI that provides code completions. It's somewhat controversial in the Emacs community but I opt in for now.

#+begin_src emacs-lisp
(defun my/copilot-tab ()
  (interactive)
  (or (copilot-accept-completion)
      (when (my/should-run-emmet-p) (my/emmet-or-tab))
      (when (and (eq evil-state 'normal)
                 (or hs-minor-mode outline-minor-mode))
        (evil-toggle-fold)
        t)
      (indent-for-tab-command)))

(use-package copilot
  :straight (:host github :repo "SqrtMinusOne/copilot.el" :files ("dist" "*.el"))
  :commands (copilot-mode)
  :if (not (or my/remote-server my/is-termux))
  :init
  (add-hook 'prog-mode-hook #'copilot-mode)
  :config
  (setq copilot-node-executable "/home/pavel/.guix-extra-profiles/dev/dev/bin/node")
  (general-define-key
   :keymaps 'company-active-map
   "<backtab>" #'my/copilot-tab)
  (general-define-key
   :keymaps 'copilot-mode-map
   "<tab>" #'my/copilot-tab
   "M-j" #'copilot-accept-completion-by-line
   "M-l" #'copilot-accept-completion-by-word)
  (setq copilot-lispy-integration t))
#+end_src
** Web development
Configs for various web development technologies I'm using.
*** Emmet
[[https://emmet.io/][Emmet]] is a toolkit which greatly speeds up typing HTML & CSS.

| Type | Note                                              |
|------+---------------------------------------------------|
| TODO | make expand div[disabled] as <div disabled></div> |

My bit of config here:
- makes =TAB= the only key I have to use

#+begin_src emacs-lisp
(defun my/should-run-emmet-p ()
  (and (bound-and-true-p emmet-mode)
       (or (and (derived-mode-p 'web-mode)
                (member (web-mode-language-at-pos) '("html" "css")))
           (not (derived-mode-p 'web-mode)))))

(use-package emmet-mode
  :straight t
  :hook ((vue-html-mode . emmet-mode)
         (svelte-mode . emmet-mode)
         (web-mode . emmet-mode)
         (html-mode . emmet-mode)
         (css-mode . emmet-mode)
         (scss-mode . emmet-mode))
  :config
  (defun my/emmet-or-tab (&optional arg)
    (interactive)
    (if (my/should-run-emmet-p)
        (or (emmet-expand-line arg)
            (emmet-go-to-edit-point 1)
            (indent-for-tab-command arg))
      (indent-for-tab-command arg)))
  (general-imap :keymaps 'emmet-mode-keymap
    "TAB" 'my/emmet-or-tab
    "<backtab>" 'emmet-prev-edit-point))
#+end_src
*** Prettier
#+begin_src emacs-lisp
(use-package prettier
  :commands (prettier-prettify)
  :straight t
  :init
  (my-leader-def
    :keymaps '(js-mode-map
               web-mode-map
               typescript-mode-map
               typescript-ts-mode-map
               vue-mode-map
               svelte-mode-map)
    "rr" #'prettier-prettify))
#+end_src
*** TypeScript
#+begin_src emacs-lisp
(use-package typescript-mode
  :straight t
  :mode "\\.ts\\'"
  :config
  (add-hook 'typescript-mode-hook #'smartparens-mode)
  (add-hook 'typescript-mode-hook #'rainbow-delimiters-mode)
  (add-hook 'typescript-mode-hook #'hs-minor-mode)
  (my/set-smartparens-indent 'typescript-mode))
#+end_src
*** JavaScript
#+begin_src emacs-lisp
(add-hook 'js-mode-hook #'smartparens-mode)
(add-hook 'js-mode-hook #'hs-minor-mode)
(my/set-smartparens-indent 'js-mode)
#+end_src
*** Jest
#+begin_src emacs-lisp
(use-package jest-test-mode
  :straight t
  :hook ((typescript-mode . jest-test-mode)
         (js-mode . jest-test-mode))
  :config
  (my-leader-def
    :keymaps 'jest-test-mode-map
    :infix "t"
    "t" #'jest-test-run-at-point
    "d" #'jest-test-debug-run-at-point
    "r" #'jest-test-run
    "a" #'jest-test-run-all-tests)
  (defmacro my/jest-test-with-debug-flags (form)
    "Execute FORM with debugger flags set."
    (declare (indent 0))
    `(let ((jest-test-options (seq-concatenate 'list jest-test-options (list "--runInBand") ))
           (jest-test-npx-options (seq-concatenate 'list jest-test-npx-options (list "--node-options" "--inspect-brk"))))
       ,form))
  (defun my/jest-test-debug ()
    "Run the test with an inline debugger attached."
    (interactive)
    (my/jest-test-with-debug-flags
      (jest-test-run)))
  (defun my/jest-test-debug-rerun-test ()
    "Run the test with an inline debugger attached."
    (interactive)
    (my/jest-test-with-debug-flags
      (jest-test-rerun-test)))
  (defun my/jest-test-debug-run-at-point ()
    "Run the test with an inline debugger attached."
    (interactive)
    (my/jest-test-with-debug-flags
      (jest-test-run-at-point)))
  (advice-add #'jest-test-debug :override #'my/jest-test-debug)
  (advice-add #'jest-test-debug-rerun-test :override #'my/jest-test-debug-rerun-test)
  (advice-add #'jest-test-debug-run-at-point
              :override #'my/jest-test-debug-run-at-point))
#+end_src

#+begin_src emacs-lisp
(defun my/jest-test-run-at-point-copy ()
  "Run the top level describe block of the current buffer's point."
  (interactive)
  (let ((filename (jest-test-find-file))
        (example  (jest-test-unit-at-point)))
    (if (and filename example)
        (jest-test-from-project-directory filename
          (let ((jest-test-options (seq-concatenate 'list jest-test-options (list "-t" example))))
            (kill-new (jest-test-command filename))))
      (message jest-test-not-found-message))))
#+end_src

*** web-mode
[[https://web-mode.org/][web-mode.el]] is a major mode to edit various web templates.

Trying this one out instead of vue-mode and svelte-mode, because this one seems to have better support for tree-sitter and generally less problems.

Set =web-mode-auto-pairs= not =nil= because smartparens already fulfills that role.

#+begin_src emacs-lisp
(use-package web-mode
  :straight t
  :commands (web-mode)
  :init
  (add-to-list 'auto-mode-alist '("\\.svelte\\'" . web-mode))
  (add-to-list 'auto-mode-alist '("\\.vue\\'" . web-mode))
  :config
  (add-hook 'web-mode-hook 'smartparens-mode)
  (add-hook 'web-mode-hook 'hs-minor-mode)
  (my/set-smartparens-indent 'web-mode)
  (setq web-mode-auto-pairs nil))
#+end_src

Hooking this up with lsp.
#+begin_src emacs-lisp
(setq my/web-mode-lsp-extensions
      `(,(rx ".svelte" eos)
        ,(rx ".vue" eos)))

(defun my/web-mode-lsp ()
  (when (seq-some
         (lambda (regex) (string-match-p regex (buffer-name)))
         my/web-mode-lsp-extensions)
    (lsp-deferred)))

(add-hook 'web-mode-hook #'my/web-mode-lsp)
#+end_src

Vue settings
#+begin_src emacs-lisp
(defun my/web-mode-vue-setup (&rest _)
  (when (string-match-p (rx ".vue" eos) (buffer-name))
    (setq-local web-mode-script-padding 0)
    (setq-local web-mode-style-padding 0)
    (setq-local create-lockfiles nil)
    (setq-local web-mode-enable-auto-pairing nil)))

(add-hook 'web-mode-hook 'my/web-mode-vue-setup)
(add-hook 'editorconfig-after-apply-functions 'my/web-mode-vue-setup)
#+end_src
*** SCSS
#+begin_src emacs-lisp
(add-hook 'scss-mode-hook #'smartparens-mode)
(add-hook 'scss-mode-hook #'hs-minor-mode)
(my/set-smartparens-indent 'scss-mode)
#+end_src
*** PHP
#+begin_src emacs-lisp
(use-package php-mode
  :straight t
  :mode "\\.php\\'"
  :config
  (add-hook 'php-mode-hook #'smartparens-mode)
  (add-hook 'php-mode-hook #'lsp)
  (my/set-smartparens-indent 'php-mode))
#+end_src
** LaTeX
*** AUCTeX
The best LaTeX editing environment I've found so far.

References:
- [[https://www.gnu.org/software/auctex/][AUCTeX homepage]]

#+begin_src emacs-lisp :noweb yes
(use-package tex
  :straight auctex
  :defer t
  :config
  (setq-default TeX-auto-save t)
  (setq-default TeX-parse-self t)
  (TeX-PDF-mode)
  ;; Use XeLaTeX & stuff
  (setq-default TeX-engine 'xetex)
  (setq-default TeX-command-extra-options "-shell-escape")
  (setq-default TeX-source-correlate-method 'synctex)
  (TeX-source-correlate-mode)
  (setq-default TeX-source-correlate-start-server t)
  (setq-default LaTeX-math-menu-unicode t)

  (setq-default font-latex-fontify-sectioning 1.3)

  ;; Scale preview for my DPI
  (setq-default preview-scale-function 1.4)
  (when (boundp 'tex--prettify-symbols-alist)
    (assoc-delete-all "--" tex--prettify-symbols-alist)
    (assoc-delete-all "---" tex--prettify-symbols-alist))

  (add-hook 'LaTeX-mode-hook
            (lambda ()
              (TeX-fold-mode 1)
              (outline-minor-mode)))

  (add-to-list 'TeX-view-program-selection
               '(output-pdf "Zathura"))

  ;; Do not run lsp within templated TeX files
  (add-hook 'LaTeX-mode-hook
            (lambda ()
              (unless (string-match "\.hogan\.tex$" (buffer-name))
                (lsp))
              (setq-local lsp-diagnostic-package :none)
              (setq-local flycheck-checker 'tex-chktex)))

  (add-hook 'LaTeX-mode-hook #'rainbow-delimiters-mode)
  (add-hook 'LaTeX-mode-hook #'smartparens-mode)
  (add-hook 'LaTeX-mode-hook #'prettify-symbols-mode)

  (my/set-smartparens-indent 'LaTeX-mode)
  (require 'smartparens-latex)

  (general-nmap
    :keymaps '(LaTeX-mode-map latex-mode-map)
    "RET" 'TeX-command-run-all
    "C-c t" 'orgtbl-mode)

  <<init-greek-latex-snippets>>
  <<init-english-latex-snippets>>
  <<init-math-latex-snippets>>
  <<init-section-latex-snippets>>)
#+end_src
*** Import *.sty
A function to import =.sty= files to the LaTeX document.

#+begin_src emacs-lisp
(defun my/list-sty ()
  (reverse
   (sort
    (seq-filter
     (lambda (file) (if (string-match ".*\.sty$" file) 1 nil))
     (directory-files
      (seq-some
       (lambda (dir)
         (if (and
              (f-directory-p dir)
              (seq-some
               (lambda (file) (string-match ".*\.sty$" file))
               (directory-files dir))
              ) dir nil))
       (list "./styles" "../styles/" "." "..")) :full))
    (lambda (f1 f2)
      (let ((f1b (file-name-base f1))
            (f1b (file-name-base f2)))
        (cond
         ((string-match-p ".*BibTex" f1) t)
         ((and (string-match-p ".*Locale" f1) (not (string-match-p ".*BibTex" f2))) t)
         ((string-match-p ".*Preamble" f2) t)
         (t (string-lessp f1 f2))))))))

(defun my/import-sty ()
  (interactive)
  (insert
   (apply #'concat
          (cl-mapcar
           (lambda (file) (concat "\\usepackage{" (file-name-sans-extension (file-relative-name file default-directory)) "}\n"))
           (my/list-sty)))))

(defun my/import-sty-org ()
  (interactive)
  (insert
   (apply #'concat
          (cl-mapcar
           (lambda (file) (concat "#+LATEX_HEADER: \\usepackage{" (file-name-sans-extension (file-relative-name file default-directory)) "}\n"))
           (my/list-sty)))))
#+end_src
*** Snippets
| Note | Type                                                            |
|------+-----------------------------------------------------------------|
| TODO | Move yasnippet snippets here? Maybe extract to a separate file? |
**** Greek letters
Autogenerate snippets for greek letters. I have a few blocks like this because it's faster & more flexible than usual yasnippet snippets.

Noweb points to the AUCTeX config block.

#+begin_src emacs-lisp :noweb-ref init-greek-latex-snippets
(setq my/greek-alphabet
      '(("a" . "\\alpha")
        ("b" . "\\beta" )
        ("g" . "\\gamma")
        ("d" . "\\delta")
        ("e" . "\\epsilon")
        ("z" . "\\zeta")
        ("h" . "\\eta")
        ("o" . "\\theta")
        ("i" . "\\iota")
        ("k" . "\\kappa")
        ("l" . "\\lambda")
        ("m" . "\\mu")
        ("n" . "\\nu")
        ("x" . "\\xi")
        ("p" . "\\pi")
        ("r" . "\\rho")
        ("s" . "\\sigma")
        ("t" . "\\tau")
        ("u" . "\\upsilon")
        ("f" . "\\phi")
        ("c" . "\\chi")
        ("v" . "\\psi")
        ("g" . "\\omega")))

(setq my/latex-greek-prefix "'")

;; The same for capitalized letters
(dolist (elem my/greek-alphabet)
  (let ((key (car elem))
        (value (cdr elem)))
    (when (string-equal key (downcase key))
      (add-to-list 'my/greek-alphabet
                   (cons
                    (capitalize (car elem))
                    (concat
                     (substring value 0 1)
                     (capitalize (substring value 1 2))
                     (substring value 2)))))))

(yas-define-snippets
 'latex-mode
 (mapcar
  (lambda (elem)
    (list (concat my/latex-greek-prefix (car elem)) (cdr elem) (concat "Greek letter " (car elem))))
  my/greek-alphabet))
#+end_src
**** English letters
#+begin_src emacs-lisp :noweb-ref init-english-latex-snippets
(setq my/english-alphabet
      '("a" "b" "c" "d" "e" "f" "g" "h" "i" "j" "k" "l" "m" "n" "o" "p" "q" "r" "s" "t" "u" "v" "w" "x" "y" "z"))

(dolist (elem my/english-alphabet)
  (when (string-equal elem (downcase elem))
    (add-to-list 'my/english-alphabet (upcase elem))))

(setq my/latex-mathbb-prefix "`")

(yas-define-snippets
 'latex-mode
 (mapcar
  (lambda (elem)
    (list (concat my/latex-mathbb-prefix elem) (concat "\\mathbb{" elem "}") (concat "Mathbb letter " elem)))
  my/english-alphabet))
#+end_src
**** Math symbols
#+begin_src emacs-lisp :noweb-ref init-math-latex-snippets
(setq my/latex-math-symbols
      '(("x" . "\\times")
        ("." . "\\cdot")
        ("v" . "\\forall")
        ("s" . "\\sum_{$1}^{$2}$0")
        ("p" . "\\prod_{$1}^{$2}$0")
        ("d" . "\\partial")
        ("e" . "\\exists")
        ("i" . "\\int_{$1}^{$2}$0")
        ("c" . "\\cap")
        ("u" . "\\cup")
        ("0" . "\\emptyset")
        ("^" . "\\widehat{$1}$0")
        ("_" . "\\overline{$1}$0")
        ("~" . "\\sim")
        ("|" . "\\mid")
        ("_|" . "\\perp")))

(setq my/latex-math-prefix ";")

(yas-define-snippets
 'latex-mode
 (mapcar
  (lambda (elem)
    (let ((key (car elem))
          (value (cdr elem)))
      (list (concat my/latex-math-prefix key) value (concat "Math symbol " value))))
  my/latex-math-symbols))
#+end_src
**** Section snippets
Section snippets. The code turned out to be more complicated than just writing the snippets by hand.

#+begin_src emacs-lisp :noweb-ref init-section-latex-snippets
(setq my/latex-section-snippets
      '(("ch" . "\\chapter{$1}")
        ("sec" . "\\section{$1}")
        ("ssec" . "\\subsection{$1}")
        ("sssec" . "\\subsubsection{$1}")
        ("par" . "\\paragraph{$1}}")))

(setq my/latex-section-snippets
      (mapcar
       (lambda (elem)
         `(,(car elem)
           ,(cdr elem)
           ,(progn
              (string-match "[a-z]+" (cdr elem))
              (match-string 0 (cdr elem)))))
       my/latex-section-snippets))

(dolist (elem my/latex-section-snippets)
  (let* ((key (nth 0 elem))
         (value (nth 1 elem))
         (desc (nth 2 elem))
         (star-index (string-match "\{\$1\}" value)))
    (add-to-list 'my/latex-section-snippets
                 `(,(concat key "*")
                   ,(concat
                     (substring value 0 star-index)
                     "*"
                     (substring value star-index))
                   ,(concat desc " with *")))
    (add-to-list 'my/latex-section-snippets
                 `(,(concat key "l")
                   ,(concat value "%\n\\label{sec:$2}")
                   ,(concat desc " with label")))))

(dolist (elem my/latex-section-snippets)
  (setf (nth 1 elem) (concat (nth 1 elem) "\n$0")))

(yas-define-snippets
 'latex-mode
 my/latex-section-snippets)
#+end_src
** Markup & natural languages
*** Markdown
#+begin_src emacs-lisp
(use-package markdown-mode
  :straight t
  :mode "\\.md\\'"
  :config
  (setq markdown-command
        (concat
         "pandoc"
         " --from=markdown --to=html"
         " --standalone --mathjax --highlight-style=pygments"
         " --css=pandoc.css"
         " --quiet"
         ))
  (setq markdown-live-preview-delete-export 'delete-on-export)
  (setq markdown-asymmetric-header t)
  (setq markdown-open-command "/home/pavel/bin/scripts/chromium-sep")
  (add-hook 'markdown-mode-hook #'smartparens-mode)
  (general-define-key
   :keymaps 'markdown-mode-map
   "M-<left>" 'markdown-promote
   "M-<right>" 'markdown-demote))

;; (use-package livedown
;;   :straight (:host github :repo "shime/emacs-livedown")
;;   :commands livedown-preview
;;   :config
;;   (setq livedown-browser "qutebrowser"))

#+end_src
*** PlantUML
| Guix dependency |
|-----------------|
| plantuml        |

#+begin_src emacs-lisp
(use-package plantuml-mode
  :straight t
  :mode "(\\.\\(plantuml?\\|uml\\|puml\\)\\'"
  :config
  (setq plantuml-executable-path "/home/pavel/.guix-extra-profiles/emacs/emacs/bin/plantuml")
  (setq plantuml-default-exec-mode 'executable)
  (setq plantuml-indent-level 2)
  (setq my/plantuml-indent-regexp-return "^\s*return\s+.+$")
  (;; (add-to-list
   ;;  'plantuml-indent-regexp-end
   ;;  my/plantuml-indent-regexp-return)
   )
  (add-to-list 'auto-mode-alist '("\\.plantuml\\'" . plantuml-mode))
  (add-to-list 'auto-mode-alist '("\\.uml\\'" . plantuml-mode))
  (add-hook 'plantuml-mode-hook #'smartparens-mode)
  (general-nmap
    :keymaps 'plantuml-mode-map
    "RET" 'plantuml-preview))
#+end_src
*** Subtitles
A major mode to work with subtitles.

#+begin_src emacs-lisp
(use-package subed
  :straight (:host github :repo "rndusr/subed" :files ("subed/*.el")
                   :build (:not native-compile))
  :config
  (general-define-key
   :keymaps '(subed-mode-map subed-vtt-mode-map)
   :states '(normal)
   "gp" #'subed-mpv-toggle-pause))
#+end_src
*** LTeX
[[https://github.com/valentjn/ltex-ls][ltex-ls]] is a tool that wraps LanguageTool into a language server.

It takes maybe 10 seconds to run on my Master's thesis file (=M-x count words=: 13453 words and 117566 characters), but it's totally worth it. And it's much faster on smaller files. The good thing is that it supports markup syntaxes like Org and Markdown, whereas LanguageTool by itself produces a lot of false positives on these files.

It shouldn't be too hard to package that for guix, but I've installed the nix version for now.
#+begin_src emacs-lisp
(use-package lsp-ltex
  :straight t
  :after (lsp)
  :init
  (setq lsp-ltex-version "15.2.0")
  (setq lsp-ltex-check-frequency "save"))
#+end_src

A function to switch the current language.
#+begin_src emacs-lisp
(defun my/ltex-lang ()
  (interactive)
  (setq lsp-ltex-language (completing-read
                           "Language: "
                           '("en-US" "ru-RU" "de-DE")))
  (lsp-workspace-restart (lsp--read-workspace)))
#+end_src

Check whether it's necessary to run LTeX:
#+begin_src emacs-lisp
(defun my/ltex-need-p ()
  (let ((file-name (buffer-file-name)))
    (cond
     ((null file-name) nil)
     ((string-match-p (rx "/home/pavel/" (+ alnum) ".org" eos) file-name) nil)
     ((string-match-p (rx (literal org-directory) "/" (or "roam" "inbox-notes" "literature-notes" "journal")) file-name) t)
     ((string-match-p (rx (literal org-directory)) file-name) nil)
     ((string-match-p (rx (literal (expand-file-name user-emacs-directory))) file-name) nil)
     (t t))))
#+end_src

To use it in =text-mode-hook=
#+begin_src emacs-lisp
(defun my/text-mode-lsp-maybe ()
  (when (my/ltex-need-p)
    (lsp)))

(add-hook 'text-mode-hook #'my/text-mode-lsp-maybe)
#+end_src
*** LanguageTool
LanguageTool is a great offline spell checker. For some reason, the download link is nowhere to be found on the home page, so it is listed in the references as well.

References:
- [[https://languagetool.org/][LanguageTool homepage]]
- [[https://dev.languagetool.org/http-server][LanguageTool http server]]
#+begin_src emacs-lisp
(use-package langtool
  :straight t
  :commands (langtool-check)
  :config
  (setq langtool-language-tool-server-jar "/home/pavel/bin/LanguageTool-5.7/languagetool-server.jar")
  (setq langtool-mother-tongue "ru")
  (setq langtool-default-language "en-US"))

(my-leader-def
  :infix "L"
  "" '(:which-key "languagetool")
  "c" 'langtool-check
  "s" 'langtool-server-stop
  "d" 'langtool-check-done
  "n" 'langtool-goto-next-error
  "p" 'langtool-goto-previous-error
  "l" 'langtool-correct-buffer)
#+end_src
*** Reverso
[[https://github.com/SqrtMinusOne/reverso.el][reverso.el]] is a package of mine that provides Emacs interface for [[https://reverso.net]].

#+begin_src emacs-lisp
(use-package reverso
  :straight (:host github :repo "SqrtMinusOne/reverso.el")
  :init
  (my-leader-def "ar" #'reverso)
  :config
  (setq reverso-languages '(russian english german)))
#+end_src
** Lisp
[[file:dot-imgs/lisp_cycles.png]]

*** Meta Lisp
Some packages for editing various Lisps.
#+begin_src emacs-lisp
(use-package lispy
  :commands (lispy-mode)
  :straight t)

(use-package lispyville
  :hook (lispy-mode . lispyville-mode)
  :straight t)

(sp-with-modes sp-lisp-modes
  (sp-local-pair "'" nil :actions nil))
#+end_src
*** Emacs Lisp
**** Package Lint
A package that checks for the metadata in Emacs Lisp packages.

#+begin_src emacs-lisp
(use-package flycheck-package
  :straight t
  :after flycheck
  :config
  (flycheck-package-setup))
#+end_src
**** General settings
#+begin_src emacs-lisp
(add-hook 'emacs-lisp-mode-hook #'aggressive-indent-mode)
;; (add-hook 'emacs-lisp-mode-hook #'smartparens-strict-mode)
(add-hook 'emacs-lisp-mode-hook #'lispy-mode)
#+end_src
**** Helper functions
Remove all advice from function. Source: https://emacs.stackexchange.com/questions/24657/unadvise-a-function-remove-all-advice-from-it

#+begin_src emacs-lisp
(defun advice-unadvice (sym)
  "Remove all advices from symbol SYM."
  (interactive "aFunction symbol: ")
  (advice-mapc (lambda (advice _props) (advice-remove sym advice)) sym))
#+end_src
**** IELM
#+begin_src emacs-lisp
(add-hook 'inferior-emacs-lisp-mode-hook #'smartparens-mode)
(my-leader-def "bi" #'ielm)
#+end_src
*** Common lisp
**** SLIME
#+begin_src emacs-lisp
(use-package slime
  :straight t
  :commands (slime)
  :config
  (setq inferior-lisp-program "sbcl")
  (add-hook 'slime-repl-mode 'smartparens-mode))
#+end_src
**** General settings
#+begin_src emacs-lisp
(add-hook 'lisp-mode-hook #'aggressive-indent-mode)
;; (add-hook 'emacs-lisp-mode-hook #'smartparens-strict-mode)
(add-hook 'lisp-mode-hook #'lispy-mode)
#+end_src
*** Clojure
#+begin_src emacs-lisp
(use-package clojure-mode
  :straight t
  :mode "\\.clj[sc]?\\'"
  :config
  ;; (add-hook 'clojure-mode-hook #'smartparens-strict-mode)
  (add-hook 'clojure-mode-hook #'lispy-mode)
  (add-hook 'clojure-mode-hook #'aggressive-indent-mode))

(use-package cider
  :after clojure-mode
  :straight t)
#+end_src
*** Hy
Python requirements:
- =hy=
- =jedhy=

#+begin_src emacs-lisp
(use-package hy-mode
  :straight t
  :mode "\\.hy\\'"
  :config
  (add-hook 'hy-mode-hook #'lispy-mode)
  (add-hook 'hy-mode-hook #'aggressive-indent-mode))
#+end_src
*** Scheme
#+begin_src emacs-lisp
(use-package geiser
  :straight t
  :commands (geiser run-geiser)
  :config
  (setq geiser-default-implementation 'guile))

(use-package geiser-guile
  :straight t
  :after geiser)

(add-hook 'scheme-mode-hook #'aggressive-indent-mode)
(add-hook 'scheme-mode-hook #'lispy-mode)
#+end_src
*** CLIPS
An honorary Lisp.

#+begin_src emacs-lisp
(use-package clips-mode
  :straight t
  :mode "\\.cl\\'"
  :disabled t
  :config
  (add-hook 'clips-mode 'lispy-mode))
#+end_src
** Python
*** ein
[[https://github.com/millejoh/emacs-ipython-notebook][ein]] is a package that allows for running Jupyter notebooks in Emacs.

#+begin_src emacs-lisp
(use-package ein
  :straight t)
#+end_src
*** pyright
For some reason it doesn't use pipenv python executable, so here is a small workaround.
#+begin_src emacs-lisp
(setq my/pipenv-python-alist '())

(defun my/get-pipenv-python ()
  (let ((default-directory (projectile-project-root)))
    (if (file-exists-p "Pipfile")
        (let ((asc (assoc default-directory my/pipenv-python-alist)))
          (if asc
              (cdr asc)
            (let ((python-executable
                   (string-trim (shell-command-to-string "PIPENV_IGNORE_VIRTUALENVS=1 pipenv run which python 2>/dev/null"))))
              (if (string-match-p ".*not found.*" python-executable)
                  (message "Pipfile found, but not pipenv executable!")
                (message (format "Found pipenv python: %s" python-executable))
                (add-to-list 'my/pipenv-python-alist (cons default-directory python-executable))
                python-executable))))
      "python")))

(use-package lsp-pyright
  :straight t
  :defer t
  :if (not my/slow-ssh)
  :hook (python-mode . (lambda ()
                         (require 'lsp-pyright)
                         (setq-local lsp-pyright-python-executable-cmd (my/get-pipenv-python))
                         (lsp))))

(add-hook 'python-mode-hook #'smartparens-mode)
(add-hook 'python-mode-hook #'hs-minor-mode)
#+end_src
*** pipenv
[[https://github.com/pypa/pipenv][Pipenv]] is a package manager for Python.

Automatically creates & manages virtualenvs and stores data in =Pipfile= and =Pipfile.lock= (like npm's =package.json= and =package-lock.json=).

#+begin_src emacs-lisp
(use-package pipenv
  :straight t
  :hook (python-mode . pipenv-mode)
  :if (not my/slow-ssh)
  :init
  (setq
   pipenv-projectile-after-switch-function
   #'pipenv-projectile-after-switch-extended))
#+end_src
*** OFF (OFF) yapf
[[https://github.com/google/yapf][yapf]] is a formatter for Python files.

| Guix dependency |
|-----------------|
| python-yapf     |

References:
- [[https://github.com/google/yapf][yapf repo]]
- [[https://github.com/JorisE/yapfify][yapfify.el repo]]
#+begin_src emacs-lisp
(use-package yapfify
  :straight (:repo "JorisE/yapfify" :host github)
  :disabled
  :commands (yapfify-region
             yapfify-buffer
             yapfify-region-or-buffer
             yapf-mode))
#+end_src

Global config:
#+begin_src conf-windows :tangle .config/yapf/style :comments link
[style]
based_on_style = facebook
column_limit = 80
#+end_src
*** black
[[https://github.com/psf/black][black]] is a formatter for Python files.

| Guix dependency |
|-----------------|
| python-black    |

#+begin_src emacs-lisp
(use-package python-black
  :straight t
  :commands (python-black-buffer)
  :config
  (setq python-black-command "black"))
#+end_src

*** isort
[[https://github.com/PyCQA/isort][isort]] is a Python package to sort Python imports.

| Guix dependency |
|-----------------|
| python-isort    |

References:
- [[https://pycqa.github.io/isort/][isort docs]]
- [[https://github.com/paetzke/py-isort.el][py-isort.el repo]]

#+begin_src emacs-lisp
(use-package py-isort
  :straight t
  :commands (py-isort-buffer py-isort-region))
#+end_src

The following binding calls yapf & isort on the buffer
#+begin_src emacs-lisp
(my-leader-def
  :keymaps 'python-mode-map
  "rr" (lambda ()
         (interactive)
         (save-excursion
           (unless (and (fboundp #'org-src-edit-buffer-p) (org-src-edit-buffer-p))
             (py-isort-buffer))
           (python-black-buffer))))
#+end_src
*** sphinx-doc
A package to generate sphinx-compatible docstrings.

#+begin_src emacs-lisp
(use-package sphinx-doc
  :straight t
  :hook (python-mode . sphinx-doc-mode)
  :config
  (my-leader-def
    :keymaps 'sphinx-doc-mode-map
    "rd" 'sphinx-doc))
#+end_src
*** pytest
[[https://docs.pytest.org/en/6.2.x/][pytest]] is a unit testing framework for Python.

Once again a function to set pytest executable from pipenv.

References:
- [[https://docs.pytest.org/en/6.2.x/][pytest docs]]
- [[https://github.com/wbolster/emacs-python-pytest][emacs-python-pytest]]

#+begin_src emacs-lisp :noweb yes
(defun my/set-pipenv-pytest ()
  (setq-local
   python-pytest-executable
   (concat (my/get-pipenv-python) " -m pytest")))

(use-package python-pytest
  :straight t
  :commands (python-pytest-dispatch)
  :init
  (my-leader-def
    :keymaps 'python-mode-map
    :infix "t"
    "t" 'python-pytest-dispatch)
  :config
  <<override-pytest-run>>
  (add-hook 'python-mode-hook #'my/set-pipenv-pytest)
  (when (derived-mode-p 'python-mode)
    (my/set-pipenv-pytest)))
#+end_src
**** Fix comint buffer width
For some reason, the default comint output width is way too large.

To fix that, I've modified the following function in the =python-pytest= package.
#+begin_src emacs-lisp :noweb-ref override-pytest-run :tangle no
(cl-defun python-pytest--run-as-comint (&key command)
  "Run a pytest comint session for COMMAND."
  (let* ((buffer (python-pytest--get-buffer))
         (process (get-buffer-process buffer)))
    (with-current-buffer buffer
      (when (comint-check-proc buffer)
        (unless (or compilation-always-kill
                    (yes-or-no-p "Kill running pytest process?"))
          (user-error "Aborting; pytest still running")))
      (when process
        (delete-process process))
      (let ((inhibit-read-only t))
        (erase-buffer))
      (unless (eq major-mode 'python-pytest-mode)
        (python-pytest-mode))
      (compilation-forget-errors)
      (display-buffer buffer)
      (setq command (format "export COLUMNS=%s; %s"
                            (- (window-width (get-buffer-window buffer)) 5)
                            command))
      (insert (format "cwd: %s\ncmd: %s\n\n" default-directory command))
      (setq python-pytest--current-command command)
      (when python-pytest-pdb-track
        (add-hook
         'comint-output-filter-functions
         'python-pdbtrack-comint-output-filter-function
         nil t))
      (run-hooks 'python-pytest-setup-hook)
      (make-comint-in-buffer "pytest" buffer "bash" nil "-c" command)
      (run-hooks 'python-pytest-started-hook)
      (setq process (get-buffer-process buffer))
      (set-process-sentinel process #'python-pytest--process-sentinel))))
#+end_src
*** code-cells
Support for text with magic comments.

| Guix dependency |
|-----------------|
| python-jupytext |

#+begin_src emacs-lisp
(use-package code-cells
  :straight t
  :commands (code-cells-mode code-cells-convert-ipynb))
#+end_src
*** tensorboard
A function to start up [[https://www.tensorflow.org/tensorboard][TensorBoard]].

#+begin_src emacs-lisp
(setq my/tensorboard-buffer "TensorBoard-out")

(defun my/tensorboard ()
  (interactive)
  (start-process
   "tensorboard"
   my/tensorboard-buffer
   "tensorboard"
   "serve"
   "--logdir"
   (car (find-file-read-args "Directory: " t)))
  (display-buffer my/tensorboard-buffer))
#+end_src
** Data serialization
*** JSON
#+begin_src emacs-lisp
(use-package json-mode
  :straight t
  :mode "\\.json\\'"
  :config
  (add-hook 'json-mode #'smartparens-mode)
  (add-hook 'json-mode #'hs-minor-mode)
  (my/set-smartparens-indent 'json-mode))
#+end_src
*** CSV
#+begin_src emacs-lisp
(use-package csv-mode
  :straight t
  :disabled
  :mode "\\.csv\\'")
#+end_src
*** YAML
#+begin_src emacs-lisp
(use-package yaml-mode
  :straight t
  :mode "\\.yml\\'"
  :config
  (add-hook 'yaml-mode-hook 'smartparens-mode)
  (add-hook 'yaml-mode-hook 'highlight-indent-guides-mode)
  (add-to-list 'auto-mode-alist '("\\.yml\\'" . yaml-mode)))
#+end_src
** Configuration
*** .env
#+begin_src emacs-lisp
(use-package dotenv-mode
  :straight t
  :mode "\\.env\\..*\\'")
#+end_src
*** .gitignore
A package to quickly create =.gitignore= files.

#+begin_src emacs-lisp
(use-package gitignore-templates
  :straight t
  :commands (gitignore-templates-insert
             gitignore-templates-new-file))
#+end_src
*** Docker
#+begin_src emacs-lisp
(use-package dockerfile-mode
  :mode "Dockerfile\\'"
  :straight t
  :config
  (add-hook 'dockerfile-mode 'smartparens-mode))
#+end_src
*** Jenkins
#+begin_src emacs-lisp
(use-package jenkinsfile-mode
  :straight t
  :config
  (add-hook 'jenkinsfile-mode-hook #'smartparens-mode)
  (my/set-smartparens-indent 'jenkinsfile-mode))
#+end_src
*** crontab
#+begin_src emacs-lisp
(use-package crontab-mode
  :straight t)
#+end_src
*** nginx
#+begin_src emacs-lisp
(use-package nginx-mode
  :straight t
  :config
  (my/set-smartparens-indent 'nginx-mode))
#+end_src
** Shell
*** sh
#+begin_src emacs-lisp
(add-hook 'sh-mode-hook #'smartparens-mode)
#+end_src
*** fish
#+begin_src emacs-lisp
(use-package fish-mode
  :straight t
  :mode "\\.fish\\'"
  :config
 (add-hook 'fish-mode-hook #'smartparens-mode))
#+end_src
** Query languages
*** SQL
[[https://github.com/zeroturnaround/sql-formatter][sql-formatter]] is a nice JavaScript package for pretty-printing SQL queries. It is not packaged for Emacs, so the easiest way to use it seems to be to define a custom formatter via [[https://github.com/purcell/emacs-reformatter][reformatter]].

Also, I've made a simple function to switch dialects because I often alternate between them.

So far I didn't find a nice SQL client for Emacs, but I occasionally run SQL queries in Org Mode, so this quite package is handy.

#+begin_src emacs-lisp
(setq my/sqlformatter-dialect-choice
      '("db2" "mariadb" "mysql" "n1ql" "plsql" "postgresql" "redshift" "spark" "sql" "tsql"))

(setq my/sqlformatter-dialect "postgresql")

(defun my/sqlformatter-set-dialect ()
  "Set dialect for sql-formatter"
  (interactive)
  (setq my/sqlformatter-dialect
        (completing-read "Dialect: " my/sqlformatter-dialect-choice)))

(reformatter-define sqlformat
  :program (executable-find "sql-formatter")
  :args `("-l" ,my/sqlformatter-dialect))

(my-leader-def
  :keymaps '(sql-mode-map)
  "rr" #'sqlformat-buffer)
#+end_src
*** SPARQL
#+begin_src emacs-lisp
(use-package sparql-mode
  :straight t)
#+end_src
*** GraphQL
#+begin_src emacs-lisp
(use-package graphql-mode
  :straight t)
#+end_src
** Documents
*** DocView
Don't know about this.

=doc-view= doesn't look great with the default =doc-view-resolution= of 100. 300 is fine, but then it becomes slow.

#+begin_src emacs-lisp
(defun my/doc-view-setup ()
  (display-line-numbers-mode -1)
  (undo-tree-mode -1))

(use-package doc-view
  :straight (:type built-in)
  :config
  (setq doc-view-resolution 300)
  (add-hook 'doc-view-mode-hook #'my/doc-view-setup)
  (general-define-key
   :states '(normal)
   :keymaps '(doc-view-mode-map)
   "j" #'doc-view-next-line-or-next-page
   "k" #'doc-view-previous-line-or-previous-page))
#+end_src
** x509
#+begin_src emacs-lisp
(use-package x509-mode
  :straight t)
#+end_src
** Java
#+begin_src emacs-lisp
(use-package lsp-java
  :straight t
  :after (lsp)
  :config
  (setq lsp-java-jdt-download-url "https://download.eclipse.org/jdtls/milestones/0.57.0/jdt-language-server-0.57.0-202006172108.tar.gz"))

(add-hook 'java-mode-hook #'smartparens-mode)
;; (add-hook 'java-mode-hook #'hs-minor-mode)
(my/set-smartparens-indent 'java-mode)
#+end_src
** Go
#+begin_src emacs-lisp
(use-package go-mode
  :straight t
  :mode "\\.go\\'"
  :config
  (my/set-smartparens-indent 'go-mode)
  (add-hook 'go-mode-hook #'smartparens-mode)
  (add-hook 'go-mode-hook #'hs-minor-mode))
#+end_src
** .NET
*** C#
| Guix dependencies | Disabled |
|-------------------+----------|
| omnisharp         | t        |
| dotnet            | t        |

Disabled that for now because it depends on the old tree sitter.

#+begin_src emacs-lisp
(use-package csharp-mode
  :straight t
  :mode "\\.cs\\'"
  :disabled t
  :config
  (setq lsp-csharp-server-path (executable-find "omnisharp-wrapper"))
  (add-hook 'csharp-mode-hook #'csharp-tree-sitter-mode)
  (add-hook 'csharp-tree-sitter-mode-hook #'smartparens-mode)
  (add-hook 'csharp-mode-hook #'hs-minor-mode)
  (my/set-smartparens-indent 'csharp-tree-sitter-mode))
#+end_src
*** MSBuild
#+begin_src emacs-lisp
(use-package csproj-mode
  :straight t
  :mode "\\.csproj\\'"
  :config
  (add-hook 'csproj-mode #'smartparens-mode))
#+end_src
** Haskell
#+begin_src emacs-lisp
(use-package haskell-mode
  :straight t
  :mode "\\.hs\\'")

(use-package lsp-haskell
  :straight t
  :after (lsp haskell-mode))
#+end_src
** nix
#+begin_src emacs-lisp
(use-package nix-mode
  :straight t
  :mode "\\.nix\\'"
  :config
  (add-hook 'nix-mode-hook #'smartparens-mode)
  (my/set-smartparens-indent 'nix-mode))
#+end_src
** Lua
#+begin_src emacs-lisp
(use-package lua-mode
  :straight t
  :mode "\\.lua\\'"
  :hook (lua-mode . smartparens-mode))

(my/set-smartparens-indent 'lua-mode)
#+end_src
* Org Mode
*Org mode* is a tool that leverages plain-text files for tasks like making notes, literate programming, task management, etc.

References:
- [[https://orgmode.org/][Org Mode homepage]]
- [[https://orgmode.org/manual/][Manual]]

** Installation & basic settings
Use the built-in org mode (=:type built-in=).

#+begin_src emacs-lisp :noweb yes
(use-package org
  :straight (:type built-in)
  :if (not my/remote-server)
  :defer t
  :init
  (setq org-directory (expand-file-name "~/30-39 Life/32 org-mode"))
  (unless (file-exists-p org-directory)
    (mkdir org-directory t))
  :config
  (setq org-startup-indented (not my/is-termux))
  (setq org-return-follows-link t)
  (setq org-src-tab-acts-natively nil)
  (add-hook 'org-mode-hook 'smartparens-mode)
  (add-hook 'org-agenda-mode-hook
            (lambda ()
              (visual-line-mode -1)
              (toggle-truncate-lines 1)
              (display-line-numbers-mode 0)))
  (add-hook 'org-mode-hook
            (lambda ()
              (rainbow-delimiters-mode -1))))
#+end_src

*** Encryption
Setting up =org-crypt= to encrypt parts of file.

#+begin_src emacs-lisp :noweb-ref
(with-eval-after-load-norem 'org
  (require 'org-crypt)
  (org-crypt-use-before-save-magic)
  (setq org-tags-exclude-from-inheritance '("crypt"))
  (setq org-crypt-key "C1EC867E478472439CC82410DE004F32AFA00205"))
#+end_src

This enables encryption for Org segments tagged =:crypt:=.

Another way to encrypt Org files is to save them with the extension =.org.gpg=. However, by default [[https://www.gnu.org/software/emacs/manual/html_mono/epa.html][EPA]] always prompts for the key, which is not what I want when there is only one key to select. Hence the following advice:
#+begin_src emacs-lisp
(defun my/epa--select-keys-around (fun prompt keys)
  (if (= (seq-length keys) 1)
      keys
    (funcall fun prompt keys)))

(with-eval-after-load-norem 'epa
  (advice-add #'epa--select-keys :around #'my/epa--select-keys-around))

(unless my/remote-server
  (setq epa-file-encrypt-to '("DE004F32AFA00205")))
#+end_src
*** org-contrib
=org-contrib= is a package with various additions to Org. I use the following:
- =ox-extra= - extensions for org export

This used to have =org-contacts= and =ol-notmuch= at some point, but they have since been migrated to separate repos.

#+begin_src emacs-lisp
(use-package org-contrib
  :straight (org-contrib
             :type git
             :repo "https://git.sr.ht/~bzg/org-contrib"
             :build t)
  :after (org)
  :if (not my/remote-server)
  :config
  (require 'ox-extra)
  (ox-extras-activate '(latex-header-blocks ignore-headlines)))
#+end_src
*** ol-notmuch
[[https://git.sr.ht/~tarsius/ol-notmuch][ol-notmuch]] is a package that adds Org links to notmuch messages.

#+begin_src emacs-lisp
(unless (or my/remote-server my/is-termux)
  (use-package ol-notmuch
    :straight t
    :after (org notmuch)))
#+end_src
*** org-tempo
=org-tempo= is a convinient package that provides snippets for various org blocks.

#+begin_src emacs-lisp
(with-eval-after-load 'org
  (require 'org-tempo)
  (add-to-list 'org-structure-template-alist '("el" . "src emacs-lisp"))
  (add-to-list 'org-structure-template-alist '("py" . "src python"))
  (add-to-list 'org-structure-template-alist '("sq" . "src sql")))
#+end_src
*** evil-org
Better integration with evil-mode.

#+begin_src emacs-lisp
(use-package evil-org
  :straight t
  :hook (org-mode . evil-org-mode)
  :config
  (add-hook 'evil-org-mode-hook
            (lambda ()
              (evil-org-set-key-theme '(navigation insert textobjects additional calendar todo))))
  (add-to-list 'evil-emacs-state-modes 'org-agenda-mode)
  (require 'evil-org-agenda)
  (evil-org-agenda-set-keys))
#+end_src
*** Support for relative URLs
Source: https://emacs.stackexchange.com/questions/9807/org-mode-dont-change-relative-urls

#+begin_src emacs-lisp
(defun my/export-rel-url (path desc format)
  (cl-case format
    (html (format "<a href=\"%s\">%s</a>" path (or desc path)))
    (latex (format "\\href{%s}{%s}" path (or desc path)))
    (otherwise path)))

(with-eval-after-load 'org
  (org-link-set-parameters "rel" :follow #'browse-url :export #'my/export-rel-url))
#+end_src

** Literate programing
*** Python & Jupyter
Use jupyter kernels for Org Mode.

References:
- [[https://github.com/nnicandro/emacs-jupyter][emacs-jupyter repo]]
- [[https://github.com/jkitchin/scimax/blob/master/scimax.org][SCIMAX manual]]

#+begin_src emacs-lisp
(use-package jupyter
  :straight t
  :after (org)
  :if (not (or my/remote-server my/is-termux)))
#+end_src

Refresh kernelspecs.

Kernelspecs by default are hashed, so even switching Anaconda environments doesn't change the kernel (i.e. kernel from the first environment is run after the switch to the second one).

#+begin_src emacs-lisp
(defun my/jupyter-refresh-kernelspecs ()
  "Refresh Jupyter kernelspecs"
  (interactive)
  (jupyter-available-kernelspecs t))
#+end_src

Also, if some kernel wasn't present at the moment of the load of =emacs-jupyter=, it won't be added to the =org-src-lang-modes= list. E.g. I have Hy kernel installed in a separate Anaconda environment, so if Emacs hasn't been launched in this environment, I wouldn't be able to use =hy= in org-src blocks.

Fortunately, =emacs-jupyter= provides a function for that problem as well.
#+begin_src emacs-lisp
(defun my/jupyter-refesh-langs ()
  "Refresh Jupyter languages"
  (interactive)
  (org-babel-jupyter-aliases-from-kernelspecs t))
#+end_src
*** Hy
#+begin_src emacs-lisp
(use-package ob-hy
  :after (org)
  :if (not my/remote-server)
  :straight t)
#+end_src
*** View HTML in browser
Open HTML in the ~begin_export~ block with xdg-open.

#+begin_src emacs-lisp
(setq my/org-view-html-tmp-dir "/tmp/org-html-preview/")

(use-package f
  :straight t)

(defun my/org-view-html ()
  (interactive)
  (let ((elem (org-element-at-point))
        (temp-file-path (concat my/org-view-html-tmp-dir (number-to-string (random (expt 2 32))) ".html")))
    (cond
     ((not (eq 'export-block (car elem)))
      (message "Not in an export block!"))
     ((not (string-equal (plist-get (car (cdr elem)) :type) "HTML"))
      (message "Export block is not HTML!"))
     (t (progn
          (f-mkdir my/org-view-html-tmp-dir)
          (f-write (plist-get (car (cdr elem)) :value) 'utf-8 temp-file-path)
          (start-process "org-html-preview" nil "xdg-open" temp-file-path))))))
#+end_src
*** PlantUML
#+begin_src emacs-lisp
(with-eval-after-load 'org
  (setq org-plantuml-executable-path "/home/pavel/.guix-extra-profiles/emacs/emacs/bin/plantuml")
  (setq org-plantuml-exec-mode 'plantuml)
  (add-to-list 'org-src-lang-modes '("plantuml" . plantuml)))
#+end_src
*** Restclient
[[https://github.com/pashky/restclient.el][restclient.el]] is an Emacs package to send HTTP requests. [[https://github.com/alf/ob-restclient.el][ob-restclient]] provides interaction with Org Babel.

References:
- [[https://joseph8th.github.io/posts/wow-writing-literate-api-documentation-in-emacs-org-mode/][WOW! Writing Literate API Documentation in Emacs Org Mode]]

#+begin_src emacs-lisp
(use-package restclient
  :if (not my/remote-server)
  :straight t)

(use-package ob-restclient
  :after (org restclient)
  :if (not my/remote-server)
  :straight t)
#+end_src
*** Org Babel Setup
Enable languages
#+begin_src emacs-lisp
(with-eval-after-load-norem 'org
  (org-babel-do-load-languages
   'org-babel-load-languages
   `((emacs-lisp . t)
     (python . t)
     (sql . t)
     ;; (typescript .t)
     (hy . t)
     (shell . t)
     (plantuml . t)
     (octave . t)
     ,@(unless my/is-termux '((jupyter . t)))
     (sparql . t)))

  (add-hook 'org-babel-after-execute-hook 'org-redisplay-inline-images))
#+end_src

Use Jupyter block instead of built-in Python.
#+begin_src emacs-lisp
(with-eval-after-load 'ob-jupyter
  (org-babel-jupyter-override-src-block "python")
  (org-babel-jupyter-override-src-block "hy"))
#+end_src

Turn of some minor modes in source blocks.
#+begin_src emacs-lisp
(add-hook 'org-src-mode-hook
          (lambda ()
            ;; (hs-minor-mode -1)
            ;; (electric-indent-local-mode -1)
            ;; (rainbow-delimiters-mode -1)
            (highlight-indent-guides-mode -1)))
#+end_src

Async code blocks evaluations. Jupyter blocks have a built-in async, so they are set as ignored.
#+begin_src emacs-lisp
(use-package ob-async
  :straight t
  :after (org)
  :config
  (setq ob-async-no-async-languages-alist '("python" "hy" "jupyter-python" "jupyter-octave" "restclient")))
#+end_src
*** Managing Jupyter kernels
Functions for managing local Jupyter kernels.

~my/insert-jupyter-kernel~ inserts a path to an active Jupyter kernel to the buffer. Useful to quickly write a header like:
#+begin_example
#+PROPERTY: header-args:python :session <path-to-kernel>
#+end_example

~my/jupyter-connect-repl~ opens a =emacs-jupyter= REPL, connected to an active kernel. ~my/jupyter-qtconsole~ runs a standalone Jupyter QtConsole.

Requirements: =ss=

#+begin_src emacs-lisp
(setq my/jupyter-runtime-folder (expand-file-name "~/.local/share/jupyter/runtime"))

(defun my/get-open-ports ()
  (mapcar
   #'string-to-number
   (split-string (shell-command-to-string "ss -tulpnH | awk '{print $5}' | sed -e 's/.*://'") "\n")))

(defun my/list-jupyter-kernel-files ()
  (mapcar
   (lambda (file) (cons (car file) (cdr (assq 'shell_port (json-read-file (car file))))))
   (sort
    (directory-files-and-attributes my/jupyter-runtime-folder t ".*kernel.*json$")
    (lambda (x y) (not (time-less-p (nth 6 x) (nth 6 y)))))))

(defun my/select-jupyter-kernel ()
  (let ((ports (my/get-open-ports))
        (files (my/list-jupyter-kernel-files)))
    (completing-read
     "Jupyter kernels: "
     (seq-filter
      (lambda (file)
        (member (cdr file) ports))
      files))))

(defun my/insert-jupyter-kernel ()
  "Insert a path to an active Jupyter kernel into the buffer"
  (interactive)
  (insert (my/select-jupyter-kernel)))

(defun my/jupyter-connect-repl ()
  "Open an emacs-jupyter REPL, connected to a Jupyter kernel"
  (interactive)
  (jupyter-connect-repl (my/select-jupyter-kernel) nil nil nil t))

(defun my/jupyter-qtconsole ()
  "Open Jupyter QtConsole, connected to a Jupyter kernel"
  (interactive)
  (start-process "jupyter-qtconsole" nil "setsid" "jupyter" "qtconsole" "--existing"
                 (file-name-nondirectory (my/select-jupyter-kernel))))
#+end_src

I've also noticed that there are JSON files left in the runtime folder whenever the kernel isn't stopped correctly. So here is a cleanup function.

#+begin_src emacs-lisp
(defun my/jupyter-cleanup-kernels ()
  (interactive)
  (let* ((ports (my/get-open-ports))
         (files (my/list-jupyter-kernel-files))
         (to-delete (seq-filter
                     (lambda (file)
                       (not (member (cdr file) ports)))
                     files)))
    (when (and (length> to-delete 0)
               (y-or-n-p (format "Delete %d files?" (length to-delete))))
      (dolist (file to-delete)
        (delete-file (car file))))))
#+end_src
*** Output post-processing
**** Do not wrap the output in emacs-jupyter
Emacs-jupyter has its own insertion mechanisms, which always prepends output statements with =:=. That is not desirable in cases where a kernel supports only plain output, e.g. calysto_hy kernel.

So there we have a minor mode that overrides this behavior.

#+begin_src emacs-lisp
(defun my/jupyter-org-scalar (value)
  (cond
   ((stringp value) value)
   (t (jupyter-org-scalar value))))

(define-minor-mode my/emacs-jupyter-raw-output
  "Make emacs-jupyter do raw output")

(defun my/jupyter-org-scalar-around (fun value)
  (if my/emacs-jupyter-raw-output
      (my/jupyter-org-scalar value)
    (funcall fun value)))

(with-eval-after-load 'jupyter
  (advice-add 'jupyter-org-scalar :around #'my/jupyter-org-scalar-around))
#+end_src
**** Wrap source code output
A function to remove the :RESULTS: drawer from results. Once again, it's necessary because emacs-jupyter doesn't seem to respect =:results raw=.
#+begin_src emacs-lisp
(defun my/org-strip-results (data)
  (replace-regexp-in-string ":\\(RESULTS\\|END\\):\n" "" data))
#+end_src

And an all-in-one function to:
- prepend =#+NAME:= and =#+CAPTION:= to the source block output. Useful if the output is an image.
- strip the :RESULTS: drawer from the output, if necessary
- wrap results in the =src= block

As for now, it looks sufficient to format source code outputs to get a tolerable LaTeX.

#+begin_src emacs-lisp
(defun my/org-caption-wrap (data &optional name caption attrs strip-drawer src-wrap)
  (let* ((data-s (if (and strip-drawer (not (string-empty-p strip-drawer)))
                     (my/org-strip-results data)
                   data))
         (drawer-start (if (string-match-p "^:RESULTS:.*" data-s) 10 0)))
    (concat
     (substring data-s 0 drawer-start)
     (and name (not (string-empty-p name)) (concat "#+NAME:" name "\n"))
     (and caption (not (string-empty-p caption)) (concat "#+CAPTION:" caption "\n"))
     (and attrs (not (string-empty-p attrs)) (concat "#+ATTR_LATEX:" attrs "\n"))
     (if (and src-wrap (not (string-empty-p src-wrap)))
         (concat "#+begin_src " src-wrap "\n"
                 (substring data-s drawer-start)
                 (when (not (string-match-p ".*\n" data-s)) "\n")
                 "#+end_src")
       (substring data-s drawer-start)))))
#+end_src

To use, add the following snippet to the org file:
#+begin_example
#+NAME: out_wrap
#+begin_src emacs-lisp :var data="" caption="" name="" attrs="" strip-drawer="" src-wrap="" :tangle no :exports none
(my/org-caption-wrap data name caption attrs strip-drawer src-wrap)
#+end_src
#+end_example

Example usage:
#+begin_example
:post out_wrap(name="fig:chart", caption="График", data=*this*)
#+end_example
**** Apply ANSI color codes
*SOURCE*: [[https://emacs.stackexchange.com/questions/44664/apply-ansi-color-escape-sequences-for-org-babel-results][Apply ANSI color escape sequences for Org Babel results]]

A minor mode to apply ANSI color codes after execution.
#+begin_src emacs-lisp
(defun my/babel-ansi ()
  (when-let ((beg (org-babel-where-is-src-block-result nil nil)))
    (save-excursion
      (goto-char beg)
      (when (looking-at org-babel-result-regexp)
        (let ((end (org-babel-result-end))
              (ansi-color-context-region nil))
          (ansi-color-apply-on-region beg end))))))

(define-minor-mode org-babel-ansi-colors-mode
  "Apply ANSI color codes to Org Babel results."
  :global t
  :after-hook
  (if org-babel-ansi-colors-mode
      (add-hook 'org-babel-after-execute-hook #'my/babel-ansi)
    (remove-hook 'org-babel-after-execute-hook #'my/babel-ansi)))
#+end_src
*** Executing stuff
A few convinient functions and keybindings to execute things in an org buffer.

First, execute things above and below the point:
#+begin_src emacs-lisp
(defun my/org-babel-execute-buffer-below (&optional arg)
  (interactive "P")
  (org-babel-eval-wipe-error-buffer)
  (let ((point (point)))
    (org-save-outline-visibility t
      (org-babel-map-executables nil
        (when (>= (point) point)
          (if (memq (org-element-type (org-element-context))
		            '(babel-call inline-babel-call))
              (org-babel-lob-execute-maybe)
            (org-babel-execute-src-block arg)))))))

(defun my/org-babel-execute-buffer-above (&optional arg)
  (interactive "P")
  (org-babel-eval-wipe-error-buffer)
  (let ((point (point)))
    (org-save-outline-visibility t
      (org-babel-map-executables nil
        (when (<= (point) point)
          (if (memq (org-element-type (org-element-context))
		            '(babel-call inline-babel-call))
              (org-babel-lob-execute-maybe)
            (org-babel-execute-src-block arg)))))))
#+end_src

Some keybindings:
#+begin_src emacs-lisp
(with-eval-after-load 'org
  (general-define-key
   :keymaps 'org-babel-map
   "B" #'my/org-babel-execute-buffer-below
   "A" #'my/org-babel-execute-buffer-above)

  (my-leader-def
    :keymaps 'org-mode-map
    "SPC b" '(:wk "org-babel")
    "SPC b" org-babel-map))
#+end_src

*** Managing a literate programming project
A few tricks to do literate programming. I actually have only one ([[https://github.com/SqrtMinusOne/sqrt-data][sqrt-data]]), and I'm not convinced in the benefits of the approach...

Anyway, Org files are better off in a separated directory (e.g. =org=). So I've come up with the following solution to avoid manually prefixing the =:tangle= arguments.

Set up the following argument with the path to the project root:
#+begin_example
#+PROPERTY: PRJ-DIR ..
#+end_example

A function to do the prefixing:
#+begin_src emacs-lisp
(defun my/org-prj-dir (path)
  (expand-file-name path (org-entry-get nil "PRJ-DIR" t)))
#+end_src

Example usage is as follows:
#+begin_example
:tangle (my/org-prj-dir "sqrt_data/api/__init__.py")
#+end_example
** Tools
Various small packages.

*** Presentations
Doing presentations with [[https://github.com/rlister/org-present][org-present]].

#+begin_src emacs-lisp
(use-package hide-mode-line
  :straight t
  :after (org-present))

(defun my/present-next-with-latex ()
  (interactive)
  (org-present-next)
  (org-latex-preview '(16)))

(defun my/present-prev-with-latex ()
  (interactive)
  (org-present-prev)
  (org-latex-preview '(16)))

(use-package org-present
  :straight (:host github :repo "rlister/org-present")
  :if (not my/remote-server)
  :commands (org-present)
  :config
  (general-define-key
   :keymaps 'org-present-mode-keymap
   "<next>" 'my/present-next-with-latex
   "<prior>" 'my/present-prev-with-latex)
  (setq org-present-mode-hook
        (list (lambda ()
                (blink-cursor-mode 0)
                (org-present-big)
                (org-bars-mode -1)
                ;; (org-display-inline-images)
                (org-present-hide-cursor)
                (org-present-read-only)
                (display-line-numbers-mode 0)
                (hide-mode-line-mode +1)
                (setq-local org-format-latex-options
                            (plist-put org-format-latex-options
                                       :scale (* org-present-text-scale my/org-latex-scale 0.5)))
                ;; (org-latex-preview '(16))
                ;; TODO ^somehow this stucks at running LaTeX^
                (setq-local olivetti-body-width 60)
                (olivetti-mode 1))))
  (setq org-present-mode-quit-hook
        (list (lambda ()
                (blink-cursor-mode 1)
                (org-present-small)
                (org-bars-mode 1)
                ;; (org-remove-inline-images)
                (org-present-show-cursor)
                (org-present-read-write)
                (display-line-numbers-mode 1)
                (hide-mode-line-mode 0)
                (setq-local org-format-latex-options (plist-put org-format-latex-options :scale my/org-latex-scale))
                (org-latex-preview '(64))
                (olivetti-mode -1)
                (setq-local olivetti-body-width (default-value 'olivetti-body-width))))))
#+end_src
*** TOC
Make a TOC inside the org file.

References:
- [[https://github.com/alphapapa/org-make-toc][alphapapa/org-make-toc]]

#+begin_src emacs-lisp
(use-package org-make-toc
  :after (org)
  :if (not my/remote-server)
  :commands
  (org-make-toc
   org-make-toc-insert
   org-make-toc-set
   org-make-toc-at-point)
  :straight t)
#+end_src
*** Screenshots
A nice package to make screenshots and insert them to the Org document.

#+begin_src emacs-lisp
(use-package org-attach-screenshot
  :commands (org-attach-screenshot)
  :straight t)
#+end_src
*** Transclusion
A package that implements transclusions in Org Mode, i.e. rendering part of one file inside another file.

#+begin_src emacs-lisp
(use-package org-transclusion
  :after org
  :straight (:host github :repo "nobiot/org-transclusion")
  :config
  (add-to-list 'org-transclusion-extensions 'org-transclusion-indent-mode)
  (require 'org-transclusion-indent-mode)
  (general-define-key
   :keymaps '(org-transclusion-map)
   :states '(normal)
   "RET" #'org-transclusion-open-source
   "gr" #'org-transclusion-refresh)
  (general-define-key
   :keymaps '(org-mode-map)
   :states 'normal
   "C-c t a" #'org-transclusion-add
   "C-c t A" #'org-transclusion-add-all
   "C-c t t" #'org-transclusion-mode))
#+end_src
*** Drawing
This package is unbelievably good. I would have never thought it's even possible to have this in Emacs.

#+begin_src emacs-lisp
(use-package edraw-org
  :straight (:host github :repo "misohena/el-easydraw")
  :if (and (not my/is-termux) (not my/remote-server))
  :after (org)
  :config
  (edraw-org-setup-default))
#+end_src
*** Managing tables
I use Org to manage some small tables which I want to process further. So here is a function that saves each table to a CSV file.

#+begin_src emacs-lisp
(defun my/export-org-tables-to-csv ()
  (interactive)
  (org-table-map-tables
   (lambda ()
     (when-let
         (name
          (plist-get (cadr (org-element-at-point)) :name))
       (org-table-export
        (concat
         (file-name-directory
          (buffer-file-name))
         name ".csv")
        "orgtbl-to-csv")))))
#+end_src
** Productivity & Knowledge management
My ongoing effort to +get a productivity setup+ manage something in my life in Org.

Initial inspirations (<2021-06-30 Wed>):
- [[https://www.labri.fr/perso/nrougier/GTD/index.html][Nicolas P. Rougier. Get Things Done with Emacs]]
- [[https://blog.jethro.dev/posts/org_mode_workflow_preview/][Jetro Kuan. Org-mode Workflow]]
- [[https://www.alexeyshmalko.com/how-i-note/][Alexey Shmalko: How I note]]
- [[https://rgoswami.me/posts/org-note-workflow/][Rohit Goswami: An Orgmode Note Workflow]]

Some later reflections (<2023-01-04 Wed>): so, it's been one year and a half... I've tried some things since writing the initial inspiration list.

[[*Org Journal][Org Journal]] and [[*Org Roam][Org Roam]] are probably the most relevant packages in my workflow now.

For [[*Org Agenda][project management]] I've ended up doing more or less plain Org files & Org Agenda. I don't feel I'd extract much benefit from a more "advanced" system, with effort estimation, atomic tasks, etc. Less is more, I guess. Besided, I'm not particularly excited about the part of my life that may require such management.

Neither I felt I was doing anything meaningful with my attempts at regular [[*Review workflow][review workflow]]. I'll think what to do with the section a bit latet.

*** Org Agenda & Project Management
I tried some things for generic project management, including:
- Managing projects in Org Roam
- Syncing with Trello
- Effort estimation & more atomic tasks
- Writing down progress on projects with =org-journal-tags=
- ...

But for now stopped on one =.org= file for one large project / a few smaller related projects and rather high-level tasks. Don't feel the need to do more yet.

**** Agenda & refile files
All my project files live in the =/projects= directory, so here's a function to set up =org-agenda-files= and =org-refile-targets= accordingly.

Also, my project structure is somewhat chaotic, so I have an =.el= file in the org directory that defines some of the refile targets.

#+begin_src emacs-lisp
(defun my/update-org-agenda ()
  (interactive)
  (let ((project-files
         (mapcar
          (lambda (f) (concat
                       org-directory "/projects/"
                       f))
          (seq-filter
           (lambda (f) (not (member f '("." ".."))))
           (directory-files
            (concat org-directory "/projects"))))))
    (setq org-agenda-files
          `("inbox.org"
            "misc/habit.org"
            "contacts.org"
            ,@project-files))
    (setq org-refile-targets
          `(,@(mapcar
               (lambda (f) `(,f . (:tag . "refile")))
               project-files)))
    (when (file-exists-p (concat org-directory "/scripts/refile.el"))
      (load-file (concat org-directory "/scripts/refile.el"))
      (run-hooks 'my/org-refile-hooks))))

(with-eval-after-load-norem 'org
  (setq org-roam-directory (concat org-directory "/roam"))
  (my/update-org-agenda)
  ;; (setq org-default-notes-file (concat org-directory "/notes.org"))
  )
#+end_src


Refile settings
#+begin_src emacs-lisp
(setq org-refile-use-outline-path 'file)
(setq org-outline-path-complete-in-steps nil)
#+end_src

**** Capture templates & various settings
Settings for Org capture mode. The goal here is to have a non-disruptive process to capture various ideas.

#+begin_src emacs-lisp
(defun my/generate-inbox-note-name ()
  (format
   "%s/inbox-notes/%s%s.org"
   org-directory
   (format-time-string "%Y%m%d%H%M%S")
   (let ((note-name (read-string "Note name: ")))
     (if (not (string-empty-p note-name))
         (string-replace " " "-" (concat "-" (downcase note-name)))
       ""))))

(setq org-capture-templates
      `(("i" "Inbox" entry  (file "inbox.org")
         ,(concat "* TODO %?\n"
                  "/Entered on/ %U"))
        ("e" "email" entry (file "inbox.org")
         ,(concat "* TODO %:from %:subject \n"
                  "/Entered on/ %U\n"
                  "/Received on/ %:date-timestamp-inactive\n"
                  "%a\n"))
        ("f" "elfeed" entry (file "inbox.org")
         ,(concat "* TODO %:elfeed-entry-title\n"
                  "/Entered on/ %U\n"
                  "%a\n"))
        ("n" "note" plain (file my/generate-inbox-note-name)
         ,(concat "#+TODO: PROCESSED(p)\n"
                  "\n"
                  "* %?\n"
                  "/Entered on/ %U"))))
#+end_src

**** org-ql
[[https://github.com/alphapapa/org-ql][org-ql]] is a package to query the org files. I've tried using it for:
- Grabbing done tasks / meetings / etc for review workflow
- Adding Trello tasks into Agenga

None of that worked out, but I'll keep the package here in case I have some more ideas.

#+begin_src emacs-lisp
(use-package org-ql
  :after (org)
  :if (not my/remote-server)
  :straight (:fetcher github
                      :repo "alphapapa/org-ql"
                      :files (:defaults (:exclude "helm-org-ql.el")))
  :init
  ;; See https://github.com/alphapapa/org-ql/pull/237
  (setq org-ql-regexp-part-ts-time
        (rx " " (repeat 1 2 digit) ":" (repeat 2 digit)
            (optional "-" (repeat 1 2 digit) ":" (repeat 2 digit)))))
#+end_src

**** Tracking habits
Let's see how this goes.

References:
- https://orgmode.org/manual/Tracking-your-habits.html

[[https://github.com/ml729/org-habit-stats][org-habit-stats]] is a pretty nice package. Using my fork until my PR is merged.

#+begin_src emacs-lisp
(use-package org-habit-stats
  :straight (:host github :repo "ml729/org-habit-stats")
  :after (org)
  :config
  (general-define-key
   :keymaps '(org-habit-stats-mode-map)
   :states '(normal emacs)
   "q" #'org-habit-stats-exit
   "<" #'org-habit-stats-calendar-scroll-left
   ">" #'org-habit-stats-calendar-scroll-right
   "[" #'org-habit-stats-scroll-graph-left
   "]" #'org-habit-stats-scroll-graph-right
   "{" #'org-habit-stats-scroll-graph-left-big
   "}" #'org-habit-stats-scroll-graph-right-big
   "." #'org-habit-stats-view-next-habit
   "," #'org-habit-stats-view-previous-habit))
#+end_src
**** Custom agendas
Some custom agendas to fit my workflow.

See [[https://emacs.stackexchange.com/questions/18179/org-agenda-command-with-org-agenda-filter-by-tag-not-working][this answer]] at Emacs StackExchange for filtering the =agenda= block by tag:
#+begin_src emacs-lisp
(defun my/org-match-at-point-p (match)
  "Return non-nil if headline at point matches MATCH.
Here MATCH is a match string of the same format used by
`org-tags-view'."
  (funcall (cdr (org-make-tags-matcher match))
           (org-get-todo-state)
           (org-get-tags-at)
           (org-reduced-level (org-current-level))))

(defun my/org-agenda-skip-without-match (match)
  "Skip current headline unless it matches MATCH.

Return nil if headline containing point matches MATCH (which
should be a match string of the same format used by
`org-tags-view').  If headline does not match, return the
position of the next headline in current buffer.

Intended for use with `org-agenda-skip-function', where this will
skip exactly those headlines that do not match."
  (save-excursion
    (unless (org-at-heading-p) (org-back-to-heading))
    (let ((next-headline (save-excursion
                           (or (outline-next-heading) (point-max)))))
      (if (my/org-match-at-point-p match) nil next-headline))))
#+end_src

And the agendas themselves:
#+begin_src emacs-lisp
(defun my/org-scheduled-get-time ()
  (let ((scheduled (org-get-scheduled-time (point))))
    (if scheduled
        (format-time-string "%Y-%m-%d" scheduled)
      "")))

(setq org-agenda-hide-tags-regexp (rx (or "org" "refile" "habit")))

(setq org-agenda-custom-commands
      `(("p" "My outline"
         ((agenda "" ((org-agenda-skip-function '(my/org-agenda-skip-without-match "-habit"))))
          (tags-todo "inbox"
                     ((org-agenda-overriding-header "Inbox")
                      (org-agenda-prefix-format " %i %-12:c")
                      (org-agenda-hide-tags-regexp ".")))
          (tags-todo "+waitlist+SCHEDULED<=\"<+14d>\""
                     ((org-agenda-overriding-header "Waitlist")
                      (org-agenda-hide-tags-regexp "waitlist")
                      (org-agenda-prefix-format " %i %-12:c %-12(my/org-scheduled-get-time)")))
          (tags-todo "habit+SCHEDULED<=\"<+0d>\""
                     ((org-agenda-overriding-header "Habits")
                      (org-agenda-prefix-format " %i %-12:c")
                      (org-agenda-hide-tags-regexp ".")))))))
#+end_src
**** Alerts
- Me at 10:00: /Open Org Agenga/ oh, there's a meeting at 15:00
- Me at 14:00: /Open Org Agenda/ oh, there's a meeting at 15:00
- Me at 14:45: Gotta remember to join in 15 minutes
- Me at 14:55: Gotta remember to join in 5 minutes
- Me at 15:05: Sh*t

Okay, I will set up +org-alert+ some custom alert system.

I want to have multiple warnings, let it be 10 minutes in advance and 1 minute in advance for now.
#+begin_src emacs-lisp
(setq my/org-alert-notify-times '(600 60))
#+end_src

And IDK if that makes much sense, but I'll try to avoid re-creating timers. So, here are functions to schedule showing some label at some time and to check whether the label is scheduled:
#+begin_src emacs-lisp
(setq my/org-alert--alerts (make-hash-table :test #'equal))

(defun my/org-alert--is-scheduled (label time)
  "Check if LABEL is scheduled to be shown an TIME."
  (gethash (cons label time)
           my/org-alert--alerts nil))

(defun my/org-alert--schedule (label time)
  "Schedule LABEL to be shown at TIME, unless it's already scheduled."
  (unless (my/org-alert--is-scheduled label time)
    (puthash (cons label time)
             (run-at-time time
                          nil
                          (lambda ()
                            (alert label
                                   :title "PROXIMITY ALERT")))
             my/org-alert--alerts)))
#+end_src

And unschedule items that need to be unscheduled:
#+begin_src emacs-lisp
(defun my/org-alert-cleanup (&optional keys)
  "Unschedule items that do not appear in KEYS.

KEYS is a list of cons cells like (<label> . <time>)."
  (let ((existing-hash (make-hash-table :test #'equal)))
    (cl-loop for key in keys
             do (puthash key t existing-hash))
    (cl-loop for key being the hash-keys of my/org-alert--alerts
             unless (gethash key existing-hash)
             do (progn
                  (cancel-timer (gethash key my/org-alert--alerts))
                  (remhash key my/org-alert--alerts)))))
#+end_src

And a function to extract the required items with =org-ql-query= and schedule them:
#+begin_src emacs-lisp
(defun my/org-alert--update-today-alerts ()
  (let ((items
         (org-ql-query
           :select 'element
           :from (org-agenda-files)
           :where `(and
                    (todo "FUTURE")
                    (ts-active :from ,(format-time-string "%Y-%m-%d %H:%M")
                               :to ,(format-time-string
                                     "%Y-%m-%d"
                                     (time-add
                                      (current-time)
                                      (* 60 60 24)))
                               :with-time t))
           :order-by 'date))
        scheduled-keys)
    (cl-loop
     for item in items
     for scheduled = (org-timestamp-to-time (org-element-property :scheduled item))
     do (cl-loop
         for before-time in my/org-alert-notify-times
         for label = (format "%s at %s [%s min. remaining]"
                             (org-element-property :raw-value item)
                             (format-time-string "%H:%M" scheduled)
                             (number-to-string (/ before-time 60)))
         for time = (time-convert
                     (+ (time-convert scheduled 'integer) (- before-time)))
         do (progn
              (my/org-alert--schedule label time)
              (push (cons label time) scheduled-keys))))
    (my/org-alert-cleanup scheduled-keys)))
#+end_src

Let's wrap it into a minor mode:
#+begin_src emacs-lisp
(setq my/org-alert--timer nil)

(define-minor-mode my/org-alert-mode ()
  :global t
  :after-hook
  (if my/org-alert-mode
      (progn
        (my/org-alert--update-today-alerts)
        (when (timerp my/org-alert--timer)
          (cancel-timer my/org-alert--timer))
        (setq my/org-alert--timer
              (run-at-time 600 t #'my/org-alert--update-today-alerts)))
    (when (timerp my/org-alert--timer)
      (cancel-timer my/org-alert--timer))
    (my/org-alert-cleanup)))
#+end_src

I don't have any idea why, but evaluating =(my/org-alert-mode)= just after =org= breaks font-lock after I try to open =inbox.org=. =emacs-startup-hook=, however, works fine.

#+begin_src emacs-lisp
(with-eval-after-load 'org
  (if my/emacs-started
      (my/org-alert-mode)
    (add-hook 'emacs-startup-hook #'my/org-alert-mode)))
#+end_src

**** Other settings
Hotkeys
#+begin_src emacs-lisp
(my-leader-def
  :infix "o"
  "" '(:which-key "org-mode")
  "c" 'org-capture
  "a" 'org-agenda)
#+end_src

Effort estimation
#+begin_src emacs-lisp
(with-eval-after-load-norem 'org
  (add-to-list 'org-global-properties
               '("Effort_ALL" . "0 0:05 0:10 0:15 0:30 0:45 1:00 2:00 4:00")))
#+end_src

Log DONE time
#+begin_src emacs-lisp
(setq org-log-done 'time)
#+end_src
**** Copying records
I like to add numbers to repeating events, like meetings. E.g.

#+begin_example
,* Job meeting 62
SCHEDULED: <2022-11-13 16:00>
,* Job meeting 63
SCHEDULED: <2022-11-13 16:00>
...
#+end_example

Naturally, I want a way to copy such records. Org Mode already has a function called =org-clone-subtree-with-time-shift=, that does everything I want except for updating the numbers.

Unfortunately, I see no way to advise the original function, so here's my version that makes use of =evil-numbers=:

#+begin_src emacs-lisp
(defun my/org-clone-subtree-with-time-shift (n &optional shift)
  (interactive "nNumber of clones to produce: ")
  (unless (wholenump n) (user-error "Invalid number of replications %s" n))
  (when (org-before-first-heading-p) (user-error "No subtree to clone"))
  (let* ((beg (save-excursion (org-back-to-heading t) (point)))
	     (end-of-tree (save-excursion (org-end-of-subtree t t) (point)))
	     (shift
	      (or shift
	          (if (and (not (equal current-prefix-arg '(4)))
		               (save-excursion
			             (goto-char beg)
			             (re-search-forward org-ts-regexp-both end-of-tree t)))
		          (read-from-minibuffer
		           "Date shift per clone (e.g. +1w, empty to copy unchanged): ")
		        "")))                   ;No time shift
	     (doshift
	      (and (org-string-nw-p shift)
	           (or (string-match "\\`[ \t]*\\([+-]?[0-9]+\\)\\([hdwmy]\\)[ \t]*\\'"
				                 shift)
		           (user-error "Invalid shift specification %s" shift)))))
    (goto-char end-of-tree)
    (unless (bolp) (insert "\n"))
    (let* ((end (point))
	       (template (buffer-substring beg end))
	       (shift-n (and doshift (string-to-number (match-string 1 shift))))
	       (shift-what (pcase (and doshift (match-string 2 shift))
			             (`nil nil)
			             ("h" 'hour)
			             ("d" 'day)
			             ("w" (setq shift-n (* 7 shift-n)) 'day)
			             ("m" 'month)
			             ("y" 'year)
			             (_ (error "Unsupported time unit"))))
	       (nmin 1)
	       (nmax n)
	       (n-no-remove -1)
	       (org-id-overriding-file-name (buffer-file-name (buffer-base-buffer)))
	       (idprop (org-entry-get beg "ID")))
      (when (and doshift
		         (string-match-p "<[^<>\n]+ [.+]?\\+[0-9]+[hdwmy][^<>\n]*>"
				                 template))
	    (delete-region beg end)
	    (setq end beg)
	    (setq nmin 0)
	    (setq nmax (1+ nmax))
	    (setq n-no-remove nmax))
      (goto-char end)
      (cl-loop for n from nmin to nmax do
	           (insert
		        ;; Prepare clone.
		        (with-temp-buffer
		          (insert template)
		          (org-mode)
		          (goto-char (point-min))
		          (org-show-subtree)
		          (and idprop (if org-clone-delete-id
				                  (org-entry-delete nil "ID")
				                (org-id-get-create t)))
		          (unless (= n 0)
		            (while (re-search-forward org-clock-line-re nil t)
		              (delete-region (line-beginning-position)
				                     (line-beginning-position 2)))
		            (goto-char (point-min))
		            (while (re-search-forward org-drawer-regexp nil t)
		              (org-remove-empty-drawer-at (point))))
		          (goto-char (point-min))

		          (when doshift
		            (while (re-search-forward org-ts-regexp-both nil t)
		              (org-timestamp-change (* n shift-n) shift-what))
                    (save-excursion
                      (goto-char (point-min))
                      (evil-numbers/inc-at-pt n (point-min)))
		            (unless (= n n-no-remove)
		              (goto-char (point-min))
		              (while (re-search-forward org-ts-regexp nil t)
			            (save-excursion
			              (goto-char (match-beginning 0))
			              (when (looking-at "<[^<>\n]+\\( +[.+]?\\+[0-9]+[hdwmy]\\)")
			                (delete-region (match-beginning 1) (match-end 1)))))))
		          (buffer-string)))))
    (goto-char beg)))
#+end_src

My addition to that is the form with =evil-numbers/inc-at-pt=.
*** Org Journal
[[https://github.com/bastibe/org-journal][org-journal]] is a package for maintaining a journal in org mode.

This part turned out to be great. I even consulted the journal a few times to check if something actually happened, which makes me uneasy now that I think about it...

One issue I found is that it's kinda hard to find anything in the journal, and I'm not eager to open the journal for a random date anyway. So I've made a package called [[https://github.com/SqrtMinusOne/org-journal-tags][org-journal-tags]].

My initial desire was to be able to query the journal for my thoughts on a particular subject or theme, for progress on some project, or for records related to some person... Which is kinda useful, although not quite as much as I expected it to be. Relatively fast querying of the journal is also nice.

The section I named "on this day" turned out to be particularly interesting, as it kinda allowed me to connect with past versions of myself.

And it was interesting to find the reinforcement effect of checked dates on the calendar.

#+begin_src emacs-lisp
(use-package org-journal
  :straight t
  :if (not my/remote-server)
  :init
  (my-leader-def
    :infix "oj"
    "" '(:which-key "org-journal")
    "j" 'org-journal-new-entry
    "o" 'org-journal-open-current-journal-file
    "s" 'org-journal-tags-status)
  :after org
  :config
  (setq org-journal-dir (concat org-directory "/journal"))
  (setq org-journal-file-type 'weekly)
  (setq org-journal-file-format "%Y-%m-%d.org")
  (setq org-journal-date-format "%A, %Y-%m-%d")
  (setq org-journal-enable-encryption t))
#+end_src

So, [[https://github.com/SqrtMinusOne/org-journal-tags][org-journal-tags]] is my package that implements a tagging system for org-journal.
#+begin_src emacs-lisp
(use-package org-journal-tags
  :straight (:host github :repo "SqrtMinusOne/org-journal-tags")
  :after (org-journal)
  :if (not my/remote-server)
  :config
  (org-journal-tags-autosync-mode)
  (general-define-key
   :keymaps 'org-journal-mode-map
   "C-c t" #'org-journal-tags-insert-tag))
#+end_src

Also, I want to add some extra information to the journal. Here's a functionality to get the current weather from wttr.in:
#+begin_src emacs-lisp
(use-package request
  :straight t
  :defer t)

(defvar my/weather-last-time 0)
(defvar my/weather-value nil)

(defun my/weather-get ()
  (when (> (- (time-convert nil 'integer) my/weather-last-time)
           (* 60 5))
    (request (format "https://wttr.in/%s" my/location)
      :params '(("format" . "%l:%20%C%20%t%20%w%20%p"))
      :sync t
      :parser (lambda () (url-unhex-string (buffer-string)))
      :timeout 10
      :success (cl-function
                (lambda (&key data &allow-other-keys)
                  (setq my/weather-value data)
                  (setq my/weather-last-time (time-convert nil 'integer))))
      :error
      (cl-function (lambda (&rest args &key error-thrown &allow-other-keys)
                     (message "Got error: %S" error-thrown)))))
  my/weather-value)
#+end_src

Let's also try to log the current mood:
#+begin_src emacs-lisp
(defun my/get-mood ()
  (let* ((crm-separator " ")
         (crm-local-completion-map
	      (let ((map (make-sparse-keymap)))
	        (set-keymap-parent map crm-local-completion-map)
	        (define-key map " " 'self-insert-command)
	        map))
         (ivy-prescient-sort-commands nil))
    (mapconcat
     #'identity
     (completing-read-multiple
      "How do you feel: "
      my/mood-list)
     " ")))
#+end_src

And here's the function that creates a drawer with such information. At the moment, it's:
- Emacs version
- Hostname
- Location
- Weather
- Current EMMS track
- Current mood

#+begin_src emacs-lisp
(defun my/set-journal-header ()
  (org-set-property "Emacs" emacs-version)
  (org-set-property "Hostname" system-name)
  (org-journal-tags-prop-apply-delta :add (list (format "host.%s" (system-name))))
  (when (boundp 'my/location)
    (org-set-property "Location" my/location)
    (when-let ((weather (my/weather-get)))
      (org-set-property "Weather" weather)))
  (when (boundp 'my/loc-tag)
    (org-journal-tags-prop-apply-delta :add (list my/loc-tag)))
  (when (fboundp 'emms-playlist-current-selected-track)
    (let ((track (emms-playlist-current-selected-track)))
      (when track
        (let ((album (cdr (assoc 'info-album track)))
              (artist (or (cdr (assoc 'info-albumartist track))
                          (cdr (assoc 'info-album track))))
              (title (cdr (assoc 'info-title track)))
              (string ""))
          (when artist
            (setq string (concat string "[" artist "] ")))
          (when album
            (setq string (concat string album " - ")))
          (when title
            (setq string (concat string title)))
          (when (> (length string) 0)
            (org-set-property "EMMS_Track" string))))))
  (when-let (mood (my/get-mood))
    (org-set-property "Mood" mood)))

(add-hook 'org-journal-after-entry-create-hook
          #'my/set-journal-header)
#+end_src
*** Bibliography
I use [[https://www.zotero.org/][Zotero]] to manage my bibliograhy.

There is a Zotero extension called [[https://retorque.re/zotero-better-bibtex/][better bibtex]], which allows for having one bibtex file that is always syncronized with the library. That comes quite handy for Emacs integration.

**** org-ref
[[https://github.com/jkitchin/org-ref][org-ref]] is an excellent package by John Kitchin that provides support for managing citations and references in Org Mode.

It may have become less relevant since =org-cite= was merged into plain Org, but =org-ref= is still just as usable.

As of now, this package loads Helm on start. To avoid this, I have to exclude Helm from the =Package-requires= in the [[file:.emacs.d/straight/repos/org-ref/org-ref.el][org-ref.el]] file. I haven't found a way to do this without modifying the package source yet.

There's a package called [[https://github.com/org-roam/org-roam-bibtex][org-roam-bibtex]] that allows to keep literature notes in [[https://github.com/org-roam/org-roam][org-roam]] and access them from =org-ref=, but as for now I store literature notes separately.

#+begin_src emacs-lisp
(use-package org-ref
  :straight (:files (:defaults "citeproc" (:exclude "*helm*")))
  :if (not my/remote-server)
  :init
  (setq bibtex-dialect 'biblatex)
  (setq bibtex-completion-bibliography '("~/30-39 Life/32 org-mode/library.bib"))
  (setq bibtex-completion-library-path '("~/30-39 Life/33 Library"))
  (setq bibtex-completion-notes-path "~/Documents/org-mode/literature-notes")
  (setq bibtex-completion-display-formats
        '((t . "${author:36} ${title:*} ${note:10} ${year:4} ${=has-pdf=:1}${=type=:7}")))
  (setq bibtex-completion-pdf-open-function
        (lambda (file)
          (start-process "dired-open" nil
                         "xdg-open" (file-truename file))))
  :after (org)
  :config
  (require 'org-ref-ivy)
  (general-define-key
   :keymaps 'org-mode-map
   "C-c l" #'org-ref-insert-link-hydra/body)
  (general-define-key
   :keymaps 'bibtex-mode-map
   "M-RET" 'org-ref-bibtex-hydra/body))
#+end_src

**** ivy-bibtex
[[https://github.com/tmalsburg/helm-bibtex][ivy-bibtex]] is an Ivy interface to bibtex. It uses the same configuration variables as =org-ref=, or rather, both packages use variables from the built-in =bibtex.el=

#+begin_src emacs-lisp
(use-package ivy-bibtex
  :commands (ivy-bibtex)
  :straight t
  :init
  (my-leader-def "fB" 'ivy-bibtex))

(add-hook 'bibtex-mode 'smartparens-mode)
#+end_src
*** Org Roam
[[https://github.com/org-roam/org-roam][org-roam]] is a plain-text knowledge database.

Things I tried with Org Roam:
- Managing projects. Ended up preferring plain Org.
- Writing a journal with =org-roam-dailies=.
  Didn't work out as I expected, so I've made =org-journal-tags= after I understood better what I want.

Regardless, it turned out to be great for managing Zettelkasten, which is the original purpose of the package anyway. I didn't expect to ever get into something like this, but I guess I was wrong.

Some resources that helped me along the way (and still help):
- Sönke Ahrens' book "How to take smart notes"
- https://zettelkasten.de/ - a lot of useful stuff here, especially in the "Getting Started" section.
- [[https://www.youtube.com/watch?v=-TpWahIzueg][System Crafters Live! - Can You Apply Zettelkasten in Emacs?]]

**** Basic package configuration
| Guix dependency       |
|-----------------------|
| emacs-emacsql-sqlite3 |
| graphviz              |

About installing the package on Guix (*CREDIT*: thanks @Ashraz on the SystemCrafters discord)

#+begin_quote
So, for all those interested: unfortunately, org-roam (or rather emacsql-sqlite) cannot compile the sqlite.c and emacsql.c due to missing headers (linux/falloc.h) on Guix. You would have to properly set all the include paths on Guix, and also adjust the PATH to have gcc actually find as later on in the compilation process.

Instead, you should remove all Org-Roam related packages from your Emacs installation (via M-x package-delete org-roam RET and  M-x package-autoremove RET y RET) and then use the Guix package called emacs-org-roam.
#+end_quote

References:
- [[https://github.com/org-roam/org-roam/wiki/Hitchhiker%27s-Rough-Guide-to-Org-roam-V2][Hitchhiker's Rough Guide to Org roam V2]]

#+begin_src emacs-lisp
(use-package emacsql-sqlite
  :defer t
  :if (not my/remote-server)
  :straight (:type built-in))

(use-package org-roam
  :straight (:host github :repo "org-roam/org-roam"
                   :files (:defaults "extensions/*.el"))
  :if (not my/remote-server)
  :after org
  :init
  (setq org-roam-file-extensions '("org"))
  (setq org-roam-v2-ack t)
  (setq orb-insert-interface 'ivy-bibtex)
  (setq org-roam-node-display-template (concat "${title:*} " (propertize "${tags:10}" 'face 'org-tag)))
  :config
  (org-roam-setup)
  (require 'org-roam-protocol))
#+end_src
**** Capture templates
Capture templates for =org-roam-capture=. As for now, nothing too complicated here.

#+begin_src emacs-lisp
(setq org-roam-capture-templates
      `(("d" "default" plain "%?"
         :if-new (file+head "%<%Y%m%d%H%M%S>-${slug}.org" "#+title: ${title}\n")
         :unnarrowed t)
        ("e" "encrypted" plain "%?"
         :if-new (file+head "%<%Y%m%d%H%M%S>-${slug}.org.gpg" "#+title: ${title}\n")
         :unnarrowed t)))
#+end_src
**** Keybindings
A set of keybindings to quickly access things in Org Roam.

#+begin_src emacs-lisp
(with-eval-after-load 'org-roam
  (my-leader-def
    :infix "or"
    "" '(:which-key "org-roam")
    "i" 'org-roam-node-insert
    "r" 'org-roam-node-find
    "g" 'org-roam-graph
    "c" 'org-roam-capture
    "b" 'org-roam-buffer-toggle)
  (general-define-key
   :keymaps 'org-roam-mode-map
   :states '(normal)
   "TAB" #'magit-section-toggle
   "q" #'quit-window
   "k" #'magit-section-backward
   "j" #'magit-section-forward
   "gr" #'revert-buffer
   "RET" #'org-roam-buffer-visit-thing))

(with-eval-after-load 'org
  (my-leader-def
    :keymap 'org-mode-map
    :infix "or"
    "t" 'org-roam-tag-add
    "T" 'org-roam-tag-remove
    "s" 'org-roam-db-autosync-mode)
  (general-define-key
   :keymap 'org-mode-map
   "C-c i" 'org-roam-node-insert))
#+end_src
**** Backlinks count display
Occasionally I want to see how many backlinks a particular page has.

This idea came to my mind because I often write a note in the following form:
#+begin_example
According to <This Person>, <some opinion>
#+end_example

And I have a note called =#Personalities= that looks like that:
#+begin_example
Philosophers:
- <This Person>
- <That Person>
- <Another Person>
...
#+end_example

So I'm curious to see how many notes I have linked to each:
#+begin_example
Philosophers:
- <This Person> [30]
- <That Person> [40]
- <Another Person> [20]
...
#+end_example

The obvious way to implement that is via [[https://www.gnu.org/software/emacs/manual/html_node/elisp/Overlays.html][overlays]]:
#+begin_src emacs-lisp
(defface my/org-roam-count-overlay-face
  '((t :inherit tooltip))
  "Face for Org Roam count overlay.")

(defun my/org-roam--count-overlay-make (pos count)
  (let* ((overlay-value (concat
                         " "
                         (propertize
                          (format "%d" count)
                          'face 'my/org-roam-count-overlay-face)
                         " "))
         (ov (make-overlay pos pos (current-buffer) nil t)))
    (overlay-put ov 'roam-backlinks-count count)
    (overlay-put ov 'priority 1)
    (overlay-put ov 'after-string overlay-value)))
#+end_src

Also a function to remove them:
#+begin_src emacs-lisp
(defun my/org-roam--count-overlay-remove-all ()
  (dolist (ov (overlays-in (point-min) (point-max)))
    (when (overlay-get ov 'roam-backlinks-count)
      (delete-overlay ov))))
#+end_src

Now we can iterate over all roam links in the buffer, count the number of backlinks via =org-roam-db-query= and invoke =my/org-roam--count-overlay-make= if that number is greater than zero:
#+begin_src emacs-lisp
(defun my/org-roam--count-overlay-make-all ()
  (my/org-roam--count-overlay-remove-all)
  (org-element-map (org-element-parse-buffer) 'link
    (lambda (elem)
      (when (string-equal (org-element-property :type elem) "id")
        (let* ((id (org-element-property :path elem))
               (count (caar
                       (org-roam-db-query
                        [:select (funcall count source)
                         :from links
                         :where (= dest $s1)
                         :and (= type "id")]
                        id))))
          (when (< 0 count)
            (my/org-roam--count-overlay-make
             (org-element-property :end elem)
             count)))))))
#+end_src

And a minor mode to toggle the display in a particular =org-roam= buffer.
#+begin_src emacs-lisp
(define-minor-mode my/org-roam-count-overlay-mode
  "Display backlink count for org-roam links."
  :after-hook
  (if my/org-roam-count-overlay-mode
      (progn
        (my/org-roam--count-overlay-make-all)
        (add-hook 'after-save-hook #'my/org-roam--count-overlay-make-all nil t))
    (my/org-roam--count-overlay-remove-all)
    (remove-hook 'after-save-hook #'my/org-roam--count-overlay-remove-all t)))
#+end_src
**** Org Roam UI
A browser frontend to visualize the Roam database as a graph.

Actually, I don't find this quite as useful as structure nodes, because over time my graph grew somewhat convoluted. But it looks impressive.

#+begin_src emacs-lisp
(use-package org-roam-ui
  :straight (:host github :repo "org-roam/org-roam-ui" :branch "main" :files ("*.el" "out"))
  :if (not my/remote-server)
  :after org-roam
  ;; :hook (org-roam . org-roam-ui-mode)
  :init
  (my-leader-def "oru" #'org-roam-ui-mode))
#+end_src
**** Org Roam Protocol
Open links such as =org-protocol://= from browser. Run =M-x server-start= for org-protocol to work.

#+begin_src conf :tangle ~/.local/share/applications/org-protocol.desktop
[Desktop Entry]
Name=Org-Protocol
Exec=emacsclient %u
Icon=emacs-icon
Type=Application
Terminal=false
MimeType=x-scheme-handler/org-protocol
#+end_src

Don't forget to run the following after setup:
#+begin_src bash :tangle no
xdg-mime default org-protocol.desktop x-scheme-handler/org-protocol
#+end_src
**** Deft
[[https://github.com/jrblevin/deft][Deft]] is an Emacs package to quickly find notes. I use it as a full-text search engine for =org-roam=.

#+begin_src emacs-lisp
(use-package deft
  :straight t
  :if (not my/remote-server)
  :commands (deft)
  :after (org)
  :init
  (my-leader-def "ord" #'deft)
  :config
  (setq deft-directory org-roam-directory)
  (setq deft-recursive t)
  (setq deft-use-filter-string-for-filename t)
  (add-hook 'deft-mode-hook
            (lambda () (display-line-numbers-mode -1)))
  (general-define-key
   :keymaps 'deft-mode-map
   :states '(normal motion)
   "q" #'quit-window
   "r" #'deft-refresh
   "s" #'deft-filter
   "d" #'deft-filter-clear
   "y" #'deft-filter-yank
   "t" #'deft-toggle-incremental-search
   "o" #'deft-toggle-sort-method))
#+end_src

The default deft view does not look that great because of various Roam metadata. To improve that, we can tweak =deft-strip-summary-regexp=:
#+begin_src emacs-lisp
(setq deft-strip-summary-regexp
      (rx (or
           (: ":PROPERTIES:" (* anything) ":END:")
           (: "#+" (+ alnum) ":" (* nonl))
           (regexp "[\n\t]"))))
#+end_src

And advise =deft-parse-summary= to filter out Org links:
#+begin_src emacs-lisp
(defun my/deft-parse-summary-around (fun contents title)
  (funcall fun (org-link-display-format contents) title))

(with-eval-after-load 'deft
  (advice-add #'deft-parse-summary :around #'my/deft-parse-summary-around))
#+end_src

Advise =deft-parse-title= to be able to extract title from the Org property:
#+begin_src emacs-lisp
(defun my/deft-parse-title (file contents)
  (with-temp-buffer
    (insert contents)
    (goto-char (point-min))
    (if (search-forward-regexp (rx (| "#+title:" "#+TITLE:")) nil t)
        (string-trim (buffer-substring-no-properties (point) (line-end-position)))
      file)))

(defun my/deft-parse-title-around (fun file contents)
  (or (my/deft-parse-title file contents)
      (funcall fun file contents)))

(with-eval-after-load 'deft
  (advice-add #'deft-parse-title :around #'my/deft-parse-title-around))
#+end_src
*** Review workflow
UPD <2022-03-27 Sun>. Out of action for now

My take on a review workflow. As a baseline, I want to have a template that lists the important changes since the last review and other basic information. I'm doing reviews regularly, but the time intervals still may vary, hence this flexibility.

This section has seen some updates over time.

**** Data from git
First, as I have [[file:Console.org::=autocommit=][autocommit]] set up in my org directory, here is a handy function to get an alist of changed files of a form =(status . path)=. In principle, the =rev= parameter can be a commit, tag, etc but here I'm interested in a form like =@{2021-08-30}=.

Also in principle, Org Roam DB also stores stuff like creation time and modification time, but I started this section before I started using Org Roam extensively, so git works fine for me.

#+begin_src emacs-lisp
(setq my/git-diff-status
      '(("A" . added)
        ("C" . copied)
        ("D" . deleted)
        ("M" . modified)
        ("R" . renamed)
        ("T" . type-changed)
        ("U" . unmerged)))

(defun my/get-files-status (rev)
  (let ((files (shell-command-to-string (concat "git diff --name-status " rev))))
    (mapcar
     (lambda (file)
       (let ((elems (split-string file "\t")))
         (cons
          (cdr (assoc (car elems) my/git-diff-status))
          (nth 1 elems))))
     (split-string files "\n" t))))
#+end_src

I'll use it to get a list of added and changed files in the Org directory since the last review. The date should be in a format =YYYY-MM-DD=.
#+begin_src emacs-lisp
(defun my/org-changed-files-since-date (date)
  (let ((default-directory org-directory))
    (my/get-files-status (format "@{%s}" date))))
#+end_src
**** Data from org-roam
Now that we have the list of new & changed files, I want to sort into a bunch of categories: projects, log entries, etc. The categories are defined by tags.

So here is a list of plists that sets these categories. The properties are as follows:
- =:status= is a git status for the file
- =:tags= is a plist that sets up the following conditions for the Roam node
  - =:include= - should be empty or one of these should be present
  - =:exclude= - should be empty or none of these should be present
- =:title= is the name of category as I want it to be seen in the review template
#+begin_src emacs-lisp
(setq my/org-review-roam-queries
      '((:status added
                 :tags (:include ("org"))
                 :title "New Project Entries")
        (:status changed
                 :tags (:include ("org"))
                 :title "Changed Project Entries")
        (:status added
                 :tags (:exclude ("org"))
                 :title "New Zettelkasten Entries")
        (:status changed
                 :tags (:exclude ("org"))
                 :title "Changed Zettelkasten Entries")))
#+end_src

This list is used to extract & format the relevant section of the review template.

=cl-loop= seems pretty good as a control flow structure, but I'll see if it is also pretty good at producing poorly maintainable code. At least at the moment of this writing, the function below looks rather concise.
#+begin_src emacs-lisp
(defun my/org-review-format-roam (changes)
  (cl-loop for query in my/org-review-roam-queries
           with nodes = (org-roam-node-list)
           with node-tags = (mapcar #'org-roam-node-tags nodes)
           for include-tags = (plist-get (plist-get query :tags) :include)
           for exclude-tags = (plist-get (plist-get query :tags) :exclude)
           ;; List of nodes filtered by :tags in query
           for filtered-nodes =
           (cl-loop for node in nodes
                    for tags in node-tags
                    if (and
                        (or (seq-empty-p include-tags)
                            (seq-intersection include-tags tags))
                        (or (seq-empty-p exclude-tags)
                            (not (seq-intersection exclude-tags tags))))
                    collect node)
           ;; List of changes filtered by :status in query
           for filtered-changes =
           (cl-loop for change in changes
                    if (and (eq (car change) (plist-get query :status))
                            (string-match-p (rx bos "roam") (cdr change)))
                    collect (cdr change))
           ;; Intersection of the two filtered lists
           for final-nodes =
           (cl-loop for node in filtered-nodes
                    for path = (file-relative-name (org-roam-node-file node)
                                                   org-directory)
                    if (member path filtered-changes)
                    collect node)
           ;; If the intersction list is not empty, format it to the result
           if final-nodes
           concat (format "** %s\n" (plist-get query :title))
           ;; FInal list of links, sorted by title
           and concat (cl-loop for node in (seq-sort
                                            (lambda (node1 node2)
                                              (string-lessp
                                               (org-roam-node-title node1)
                                               (org-roam-node-title node2)))
                                            final-nodes)
                               concat (format "- [[id:%s][%s]]\n"
                                              (org-roam-node-id node)
                                              (org-roam-node-title node)))))
#+end_src
**** Data from org-agenda via org-ql
+Third+ second, I want to list some changes in my agenda. This section will change depending on what I'm currently working on.

So, here is a list of queries results of which I want to see in the review template. The format is =(name date-field order-by-field query)=.
#+begin_src emacs-lisp
(setq my/org-ql-review-queries
      `(("Waitlist" scheduled scheduled
         (and
          (done)
          (tags-inherited "waitlist")))
        ("Personal tasks done" closed ,nil
         (and
          (tags-inherited "personal")
          (todo "DONE")))
        ("Attended meetings" closed scheduled
         (and
          (tags-inherited "meeting")
          (todo "PASSED")))
        ("Done project tasks" closed deadline
         (and
          (todo "DONE")
          (ancestors
           (heading "Tasks"))))))
#+end_src

The query will be executed like this: =(and (date-field :from rev-date) query)=
#+begin_src emacs-lisp
(defun my/org-review-exec-ql (saved rev-date)
  (let ((query `(and
                 (,(nth 1 saved) :from ,rev-date)
                 ,(nth 3 saved))))
    (org-ql-query
      :select #'element
      :from (org-agenda-files)
      :where query
      :order-by (nth 2 saved))))
#+end_src

Format one element of the query result.
#+begin_src emacs-lisp
(defun my/org-review-format-element (elem)
  (concat
   (string-pad
    (plist-get (cadr elem) :raw-value)
    40)
   (when-let (scheduled (plist-get (cadr elem) :scheduled))
     (concat " [SCHEDULED: " (plist-get (cadr scheduled) :raw-value) "]"))
   (when-let (deadline (plist-get (cadr elem) :deadline))
     (concat " [DEADLINE: " (plist-get (cadr deadline) :raw-value) "]"))))
#+end_src

Execute all the saved queries and format an Org list for the capture template.
#+begin_src emacs-lisp
(defun my/org-review-format-queries (rev-date)
  (mapconcat
   (lambda (results)
     (concat "** " (car results) "\n"
             (string-join
              (mapcar (lambda (r) (concat "- " r)) (cdr results))
              "\n")
             "\n"))
   (seq-filter
    (lambda (result)
      (not (seq-empty-p (cdr result))))
    (mapcar
     (lambda (saved)
       (cons
        (car saved)
        (mapcar
         #'my/org-review-format-element
         (my/org-review-exec-ql saved rev-date))))
     my/org-ql-review-queries))
   "\n"))
#+end_src
**** Capture template
Now, we have to put all this together and define a capture template for the review.

+I'll use a separate directory for the review files, just like for org-journal and org-roam.+ I'll store the review files in org-roam. Time will tell if that's a good idea. The filename will have a format =YYYY-MM-DD.org=, which will also free me from the effort of storing the last review date somewhere.

If somehow there are no files in the folder, fallback to the current date minus one two week. Also featuring the most awkward date transformation I've ever done just to add one date.

#+begin_src emacs-lisp
(setq my/org-review-directory "review")

(defun my/get-last-review-date ()
  (->
   (substring
    (or
     (-max-by
      'string-greaterp
      (-filter
       (lambda (f) (not (or (string-equal f ".") (string-equal f ".."))))
       (directory-files (f-join org-roam-directory my/org-review-directory))))
     (format-time-string
      "%Y-%m-%d"
      (time-subtract
       (current-time)
       (seconds-to-time (* 60 60 24 14)))))
    0 10)
   (concat "T00:00:00-00:00")
   parse-time-string
   encode-time
   (time-add (seconds-to-time (* 60 60 24)))
   ((lambda (time)
      (format-time-string "%Y-%m-%d" time)))))
#+end_src

A template looks like this:
#+begin_src emacs-lisp
(setq my/org-review-capture-template
      `("r" "Review" plain
        ,(string-join
          '("#+title: %<%Y-%m-%d>: REVIEW"
            "#+category: REVIEW"
            "#+filetags: log review"
            "#+STARTUP: overview"
            ""
            "Last review date: %(org-timestamp-translate (org-timestamp-from-string (format \"<%s>\" (my/get-last-review-date))))"
            ""
            "* Roam"
            "%(my/org-review-format-roam (my/org-changed-files-since-date (my/get-last-review-date)))"
            "* Agenda"
            "%(my/org-review-format-queries (my/get-last-review-date))"
            "* Thoughts"
            "%?")
          "\n")
        :if-new (file "review/%<%Y-%m-%d>.org.gpg")))

(defun my/org-roam-capture-review ()
  (interactive)
  (org-roam-capture- :node (org-roam-node-create)
                     :templates `(,my/org-review-capture-template)))
#+end_src
*** Contacts
=org-contacts= is a package to store contacts in an org file.

It seems the package has been somewhat revived in the recent months. It used things like =lexical-let= when I first found it.

#+begin_src emacs-lisp
(use-package org-contacts
  :straight (:type git :repo "https://repo.or.cz/org-contacts.git")
  :if (not my/remote-server)
  :after (org)
  :config
  (setq org-contacts-files (list
                            (concat org-directory "/contacts.org"))))
#+end_src

An example contact entry can look like this:
#+begin_example
,* Pavel Korytov
:PROPERTIES:
:TYPE:     person
:EMAIL:    thexcloud@gmail.com
:EMAIL+:   pvkorytov@etu.ru
:BIRTHDAY: [1998-08-14]
:END:
#+end_example
*** Calendar view
[[https://github.com/kiwanami/emacs-calfw][calfw]] is a nice package that displays calendars in Emacs.

#+begin_src emacs-lisp
(defun my/calfw-setup-buffer ()
  (display-line-numbers-mode -1))

(use-package calfw
  :straight t
  :config
  (add-hook 'cfw:calendar-mode-hook #'my/calfw-setup-buffer))

(use-package calfw-org
  :after (calfw org)
  :straight t)
#+end_src
** UI
*** LaTeX fragments
A function to enable LaTeX native highlighting. Not setting this as default, because it loads LaTeX stuff.
#+begin_src emacs-lisp
(defun my/enable-org-latex ()
  (interactive)
  (customize-set-variable 'org-highlight-latex-and-related '(native))
  (add-hook 'org-mode-hook (lambda () (yas-activate-extra-mode 'LaTeX-mode)))
  (sp-local-pair 'org-mode "$" "$")
  (sp--remove-local-pair "'"))
#+end_src

Call the function before opening an org file or reopen a buffer after calling the function.

Scale latex fragments preview.
#+begin_src emacs-lisp
(with-eval-after-load-norem 'org
  (setq my/org-latex-scale 1.75)
  (setq org-format-latex-options (plist-put org-format-latex-options :scale my/org-latex-scale)))
#+end_src

Also, LaTeX fragments preview tends to break whenever the are custom =#+LATEX_HEADER= entries. To circumvent this, I add a custom header and modify the ~org-preview-latex-process-alist~ variable
#+begin_src emacs-lisp
(with-eval-after-load-norem 'org
  (setq my/latex-preview-header "\\documentclass{article}
\\usepackage[usenames]{color}
\\usepackage{graphicx}
\\usepackage{grffile}
\\usepackage{longtable}
\\usepackage{wrapfig}
\\usepackage{rotating}
\\usepackage[normalem]{ulem}
\\usepackage{amsmath}
\\usepackage{textcomp}
\\usepackage{amssymb}
\\usepackage{capt-of}
\\usepackage{hyperref}
\\pagestyle{empty}")

  (setq org-preview-latex-process-alist
        (mapcar
         (lambda (item)
           (cons
            (car item)
            (plist-put (cdr item) :latex-header my/latex-preview-header)))
         org-preview-latex-process-alist)))
#+end_src
*** Better headers
[[https://github.com/integral-dw/org-superstar-mode][org-superstar-mode]] is a package that makes Org heading lines look a bit prettier.

Disabled it for now because of overlapping functionality with org-bars.

#+begin_src emacs-lisp
(use-package org-superstar
  :straight t
  :disabled
  :hook (org-mode . org-superstar-mode))
#+end_src

[[https://github.com/tonyaldon/org-bars][org-bars]] highlights Org indentation with bars.
#+begin_src emacs-lisp
(use-package org-bars
  :straight (:repo "tonyaldon/org-bars" :host github)
  :if (display-graphic-p)
  :hook (org-mode . org-bars-mode))
#+end_src

Remove the ellipsis at the end of folded headlines, as it seems unnecessary with =org-bars=.
#+begin_src emacs-lisp
(defun my/org-no-ellipsis-in-headlines ()
  (remove-from-invisibility-spec '(outline . t))
  (add-to-invisibility-spec 'outline))

(with-eval-after-load 'org-bars
  (add-hook 'org-mode-hook #'my/org-no-ellipsis-in-headlines)
  (when (eq major-mode 'org-mode)
    (my/org-no-ellipsis-in-headlines)))
#+end_src
*** Override colors
#+begin_src emacs-lisp
(my/use-colors
 (org-block :background (my/color-value 'bg-other))
 (org-block-begin-line :background (my/color-value 'bg-other)
                       :foreground (my/color-value 'grey)))
#+end_src
** Export
*** Hugo
A package for exporting Org to Hugo. That's how I manage my [[https://sqrtminusone.xyz][sqrtminusone.xyz]].

References:
- [[https://ox-hugo.scripter.co/][ox-hugo homepage]]
- [[https://github.com/SqrtMinusOne/sqrtminusone.github.io][Source code for sqrtminusone.xyz]]

#+begin_src emacs-lisp
(use-package ox-hugo
  :straight t
  :if (not my/remote-server)
  :after ox)
#+end_src
*** Jupyter Notebook
#+begin_src emacs-lisp
(use-package ox-ipynb
  :straight (:host github :repo "jkitchin/ox-ipynb")
  :if (not my/remote-server)
  :after ox)
#+end_src
*** Html export
#+begin_src emacs-lisp
(use-package htmlize
  :straight t
  :after ox
  :if (not my/remote-server)
  :config
  (setq org-html-htmlize-output-type 'css))
#+end_src
*** org-ref
#+begin_src emacs-lisp
(with-eval-after-load 'org-ref
  (setq org-ref-csl-default-locale "ru-RU")
  (setq org-ref-csl-default-style (expand-file-name
                                   (concat user-emacs-directory
                                           "gost-r-7-0-5-2008-numeric.csl"))))
#+end_src
*** LaTeX
Add a custom LaTeX template without default packages. Packages are indented to be imported with function from [[Import *.sty]].
#+begin_src emacs-lisp
(defun my/setup-org-latex ()
  (setq org-latex-prefer-user-labels t)
  (setq org-latex-compiler "xelatex") ;; Probably not necessary
  (setq org-latex-pdf-process '("latexmk -outdir=%o %f")) ;; Use latexmk
  (setq org-latex-listings 'minted) ;; Use minted to highlight source code
  (setq org-latex-minted-options    ;; Some minted options I like
        '(("breaklines" "true")
          ("tabsize" "4")
          ("autogobble")
          ("linenos")
          ("numbersep" "0.5cm")
          ("xleftmargin" "1cm")
          ("frame" "single")))
  ;; Use extarticle without the default packages
  (add-to-list 'org-latex-classes
               '("org-plain-extarticle"
                 "\\documentclass{extarticle}
[NO-DEFAULT-PACKAGES]
[PACKAGES]
[EXTRA]"
                 ("\\section{%s}" . "\\section*{%s}")
                 ("\\subsection{%s}" . "\\subsection*{%s}")
                 ("\\subsubsection{%s}" . "\\subsubsection*{%s}")
                 ("\\paragraph{%s}" . "\\paragraph*{%s}")
                 ("\\subparagraph{%s}" . "\\subparagraph*{%s}")))
  (add-to-list 'org-latex-classes
               '("org-plain-extreport"
                 "\\documentclass{extreport}
[NO-DEFAULT-PACKAGES]
[PACKAGES]
[EXTRA]"
                 ("\\chapter{%s}" . "\\chapter*{%s}")
                 ("\\section{%s}" . "\\section*{%s}")
                 ("\\subsection{%s}" . "\\subsection*{%s}")
                 ("\\subsubsection{%s}" . "\\subsubsection*{%s}")
                 ("\\paragraph{%s}" . "\\paragraph*{%s}")))
  ;; Use beamer without the default packages
  (add-to-list 'org-latex-classes
               '("org-latex-beamer"
                 "\\documentclass{beamer}
[NO-DEFAULT-PACKAGES]
[PACKAGES]
[EXTRA]"
                 ("beamer" "\\documentclass[presentation]{beamer}"
                  ("\\section{%s}" . "\\section*{%s}")
                  ("\\subsection{%s}" . "\\subsection*{%s}")
                  ("\\subsubsection{%s}" . "\\subsubsection*{%s}")))))

;; Make sure to eval the function when org-latex-classes list already exists
(with-eval-after-load-norem 'ox-latex
  (my/setup-org-latex))
#+end_src

**** Fix Russian dictionary
No idea why, but somehow the exported uses english words if there isn't =:default= key in the dictionary.

#+begin_src emacs-lisp
(with-eval-after-load 'ox
  (setq org-export-dictionary
        (cl-loop for item in org-export-dictionary collect
                 (cons
                  (car item)
                  (cl-loop for entry in (cdr item)
                           if (and (equal (car entry) "ru")
                                   (plist-get (cdr entry) :utf-8))
                           collect (list "ru" :default (plist-get (cdr entry) :utf-8))
                           else collect entry)))))
#+end_src

** Keybindings & stuff
*** General keybindings
#+begin_src emacs-lisp
(with-eval-after-load-norem 'org
  (general-define-key
   :keymaps 'org-mode-map
   "C-c d" 'org-decrypt-entry
   "C-c e" 'org-encrypt-entry
   "M-p" 'org-latex-preview
   "M-o" 'org-redisplay-inline-images)

  (general-define-key
   :keymaps 'org-mode-map
   :states '(normal emacs)
   "L" 'org-shiftright
   "H" 'org-shiftleft
   "S-<next>" 'org-next-visible-heading
   "S-<prior>" 'org-previous-visible-heading
   "M-0" 'org-next-visible-heading
   "M-9" 'org-previous-visible-heading
   "M-]" 'org-babel-next-src-block
   "M-[" 'org-babel-previous-src-block)

  (general-define-key
   :keymaps 'org-agenda-mode-map
   "M-]" 'org-agenda-later
   "M-[" 'org-agenda-earlier)

  (general-nmap :keymaps 'org-mode-map "RET" 'org-ctrl-c-ctrl-c))
#+end_src
*** Copy a link
#+begin_src emacs-lisp
(defun my/org-link-copy (&optional arg)
  "Extract URL from org-mode link and add it to kill ring."
  (interactive "P")
  (let* ((link (org-element-lineage (org-element-context) '(link) t))
         (type (org-element-property :type link))
         (url (org-element-property :path link))
         (url (concat type ":" url)))
    (kill-new url)
    (message (concat "Copied URL: " url))))

(with-eval-after-load-norem 'org
  (general-nmap :keymaps 'org-mode-map
    "C-x C-l" 'my/org-link-copy))
#+end_src
*** Navigating source blocks
An idea born from discussing Org Mode navigation with @Infu.

Modifying =org-babel-next-src-block= and =org-babel-previous-src-block= to ignore hidden source blocks.

#+begin_src emacs-lisp
(defun my/org-babel-next-visible-src-block (arg)
  "Move to the next visible source block.

With ARG, repeats or can move backward if negative."
  (interactive "p")
  (let ((regexp org-babel-src-block-regexp))
    (if (< arg 0)
	    (beginning-of-line)
      (end-of-line))
    (while (and (< arg 0) (re-search-backward regexp nil :move))
      (unless (bobp)
	    (while (pcase (get-char-property-and-overlay (point) 'invisible)
		         (`(outline . ,o)
		          (goto-char (overlay-start o))
		          (re-search-backward regexp nil :move))
		         (_ nil))))
      (cl-incf arg))
    (while (and (> arg 0) (re-search-forward regexp nil t))
      (while (pcase (get-char-property-and-overlay (point) 'invisible)
	           (`(outline . ,o)
		        (goto-char (overlay-end o))
		        (re-search-forward regexp nil :move))
	           (_ (end-of-line) nil)))
      (re-search-backward regexp nil :move)
      (cl-decf arg))
    (if (> arg 0) (goto-char (point-max)) (beginning-of-line))))

(defun my/org-babel-previous-visible-src-block (arg)
  "Move to the prevous visible source block.

With ARG, repeats or can move backward if negative."
  (interactive "p")
  (my/org-babel-next-visible-src-block (- arg)))

(with-eval-after-load 'org
  (general-define-key
   :keymaps 'org-mode-map
   :states '(normal emacs)
   "M-]" #'my/org-babel-next-visible-src-block
   "M-[" #'my/org-babel-previous-visible-src-block))
#+end_src
*** Open a file from =org-directory=
A function to open a file from =org-directory=, excluding a few directories like =roam= and =journal=.

#+begin_src emacs-lisp
(defun my/org-file-open ()
  (interactive)
  (let* ((files
          (thread-last
            '("projects" "misc")
            (mapcar (lambda (f)
                      (directory-files (concat org-directory "/" f) t (rx ".org" eos))))
            (apply #'append)
            (mapcar (lambda (file)
                      (string-replace (concat org-directory "/") "" file)))
            (append
             '("inbox.org" "contacts.org")))))
    (find-file
     (concat org-directory "/"
             (completing-read "Org file: " files)))))

(my-leader-def
  "o o" 'my/org-file-open)
#+end_src
** System configuration
Functions related to literate configuration.

*** Tables for Guix Dependencies
This section deals with using [[https://guix.gnu.org/en/cookbook/en/html_node/Advanced-package-management.html#Advanced-package-management][using profiles in GNU Guix]].

A "profile" in Guix is a way to group package installations. For instance, I have a "music" profile that has software like [[https://www.musicpd.org/][MPD]], [[https://github.com/ncmpcpp/ncmpcpp][ncmpcpp]] that I'm still occasionally using because of its tag editor, etc. Corresponding to that profile, there's a manifest named =music.scm= that looks like this:
#+begin_src scheme
(specifications->manifest
 '(
   "flac"
   "cuetools"
   "shntool"
   "mpd-mpc"
   "mpd-watcher"
   "picard"
   "ncmpcpp"
   "mpd"))
#+end_src

I could generate this file with =org-babel= as any other, but that is often not so convenient. For example, I have a [[https://github.com/polybar/polybar][polybar]] module that uses [[https://github.com/risacher/sunwait][sunwait]] to show sunset and sunrise times, and ideally, I want to declare =sunwait= to be in the "desktop-polybar" profile in the same section that has the polybar module definition and the bash script.

So here's an approach I came up with. The relevant section of the config looks like this:
#+begin_example
,*** sun
| Category        | Guix dependency |
|-----------------+-----------------|
| desktop-polybar | sunwait         |

Prints out the time of sunrise/sunset. Uses [[https://github.com/risacher/sunwait][sunwait]]

,#+begin_src bash :tangle ./bin/polybar/sun.sh :noweb yes
...script...
,#+end_src

,#+begin_src conf-windows :noweb yes
...polybar module definition...
,#+end_src
#+end_example

So =sunwait= is declared in an Org table with =Guix dependency= in the header. Such tables are spread through my configuration files.

Thus I made a function that extracts packages from all such tables from the current Org buffer. The rules are as follows:
- If a column name matches =[G|g]uix.*dep=, its contents are added to the result.
- If =CATEGORY= is passed, a column with name =[C|c]ategory= is used to filter results. That way, one Org file can be used to produce multiple manifests.
- If =CATEGORY= is not passed, entries with the non-empty category are filtered out
- If there is a =[D|d]isabled= column, entries that have a non-empty value in this column are filtered out.

And here is the implementation:
#+begin_src emacs-lisp :noweb-ref guix-tables
(defun my/extract-guix-dependencies (&optional category)
  (let ((dependencies '()))
    (org-table-map-tables
     (lambda ()
       (let* ((table
               (seq-filter
                (lambda (q) (not (eq q 'hline)))
                (org-table-to-lisp)))
              (dep-name-index
               (cl-position
                nil
                (mapcar #'substring-no-properties (nth 0 table))
                :test (lambda (_ elem)
                        (string-match-p "[G|g]uix.*dep" elem))))
              (category-name-index
               (cl-position
                nil
                (mapcar #'substring-no-properties (nth 0 table))
                :test (lambda (_ elem)
                        (string-match-p ".*[C|c]ategory.*" elem))))
              (disabled-name-index
               (cl-position
                nil
                (mapcar #'substring-no-properties (nth 0 table))
                :test (lambda (_ elem)
                        (string-match-p ".*[D|d]isabled.*" elem)))))
         (when dep-name-index
           (dolist (elem (cdr table))
             (when
                 (and
                  ;; Category
                  (or
                   ;; Category not set and not present in the table
                   (and
                    (or (not category) (string-empty-p category))
                    (not category-name-index))
                   ;; Category is set and present in the table
                   (and
                    category-name-index
                    (not (string-empty-p category))
                    (string-match-p category (nth category-name-index elem))))
                  ;; Not disabled
                  (or
                   (not disabled-name-index)
                   (string-empty-p (nth disabled-name-index elem))))
               (add-to-list
                'dependencies
                (substring-no-properties (nth dep-name-index elem)))))))))
    dependencies))
#+end_src

To make it work in the configuration, it is necessary to format the list so that Scheme could read it:
#+begin_src emacs-lisp :noweb-ref guix-tables
(defun my/format-guix-dependencies (&optional category)
  (mapconcat
   (lambda (e) (concat "\"" e "\""))
   (my/extract-guix-dependencies category)
   "\n"))
#+end_src

And we need an Org snippet such as this:
#+begin_example
#+NAME: packages
#+begin_src emacs-lisp :tangle no :var category=""
(my/format-guix-dependencies category)
#+end_src
#+end_example

Now, creating a manifest, for example, for the =desktop-polybar= profile is as simple as:
#+begin_example
#+begin_src scheme :tangle ~/.config/guix/manifests/desktop-polybar.scm :noweb yes
(specifications->manifest
 '(
   <<packages("desktop-polybar")>>))
#+end_src
#+end_example

There's a newline symbol between "(" and =<<packages("desktop-polybar")>>= because whenever a noweb expression expands into multiple lines, for each new line noweb duplicates contents between the start of the line and the start of the expression.

One reason this is so is to support languages where indentation is a part of the syntax, for instance, Python:
#+begin_src python
class TestClass:
    <<class-contents>>
#+end_src

So every line of =<<class-contents>>= will be indented appropriately. In our case though, it is a minor inconvenience to be aware of.
*** Noweb evaluations
One note is that by default running these commands will require the user to confirm evaluation of each code block. To avoid that, I set =org-confirm-babel-evaluate= to =nil=:

#+begin_src emacs-lisp
(setq my/org-config-files
      '("/home/pavel/Emacs.org"
        "/home/pavel/Desktop.org"
        "/home/pavel/Console.org"
        "/home/pavel/Guix.org"
        "/home/pavel/Mail.org"))

(add-hook 'org-mode-hook
          (lambda ()
            (when (member (buffer-file-name) my/org-config-files)
              (setq-local org-confirm-babel-evaluate nil))))
#+end_src
*** yadm hook
A script to run tangle from CLI.

#+begin_src emacs-lisp :tangle ~/.config/yadm/hooks/run-tangle.el :noweb yes
(require 'org)

(org-babel-do-load-languages
 'org-babel-load-languages
 '((emacs-lisp . t)
   (shell . t)))

;; Do not ask to confirm evaluations
(setq org-confirm-babel-evaluate nil)

<<guix-tables>>

;; A few dummy modes to avoid being prompted for comment systax
(define-derived-mode fish-mode prog-mode "Fish"
  (setq-local comment-start "# ")
  (setq-local comment-start-skip "#+[\t ]*"))

(define-derived-mode yaml-mode text-mode "YAML"
  (setq-local comment-start "# ")
  (setq-local comment-start-skip "#+ *"))

(mapcar #'org-babel-tangle-file
        '("/home/pavel/Emacs.org"
          "/home/pavel/Desktop.org"
          "/home/pavel/Console.org"
          "/home/pavel/Guix.org"
          "/home/pavel/Mail.org"))
#+end_src

To launch from CLI, run:
#+begin_src bash :tangle no
emacs -Q --batch -l run-tangle.el
#+end_src


I have added this line to yadm's =post_alt= hook, so to run tangle after =yadm alt=
*** Regenerate desktop config
Somewhat similar to the previous one... Occasinally I want to re-tangle all desktop configuration files, for instance to apply a new theme.

#+begin_src emacs-lisp
(defun my/regenerate-desktop ()
  (interactive)
  (org-babel-tangle-file "/home/pavel/Desktop.org")
  (org-babel-tangle-file "/home/pavel/Console.org")
  (call-process "xrdb" nil nil nil "-load" "/home/pavel/.Xresources")
  (call-process "~/bin/polybar.sh")
  (call-process "pkill" nil nil nil "dunst")
  (call-process "herd" nil nil nil "restart" "xsettingsd")
  (when (fboundp #'my/exwm-set-alpha)
    (if (my/light-p)
        (my/exwm-set-alpha 100)
      (my/exwm-set-alpha 90))))
#+end_src

*** Folders
#+begin_src emacs-lisp
(let ((folders-file (expand-file-name "folders.el" user-emacs-directory)))
  (when (file-exists-p folders-file)
    (load-file folders-file)))
#+end_src
* Applications
** Dired
Dired is the built-in Emacs file manager. It's so good that it's strange that, to my knowledge, no one tried to replicate it outside of Emacs.

I currently use it as my primary file manager.

*** Basic config & keybindings
My config mostly follows ranger's and vifm's keybindings which I'm used to.

#+begin_src emacs-lisp
(use-package dired
  :ensure nil
  :custom ((dired-listing-switches "-alh --group-directories-first"))
  :commands (dired)
  :config
  (setq dired-dwim-target t)
  (setq wdired-allow-to-change-permissions t)
  (setq wdired-create-parent-directories t)
  (setq dired-recursive-copies 'always)
  (setq dired-recursive-deletes 'always)
  (setq dired-kill-when-opening-new-dired-buffer t)
  (add-hook 'dired-mode-hook
            (lambda ()
              (setq truncate-lines t)
              (visual-line-mode nil)))

  (when my/is-termux
    (add-hook 'dired-mode-hook #'dired-hide-details-mode))
  (general-define-key
   :states '(normal)
   :keymaps 'dired-mode-map
   "h" #'dired-up-directory
   "l" #'dired-find-file
   "=" #'dired-narrow
   "-" #'my/dired-create-empty-file-subtree
   "~" #'vterm
   "M-r" #'wdired-change-to-wdired-mode
   "<left>" #'dired-up-directory
   "<right>" #'dired-find-file
   "M-<return>" #'dired-open-xdg))

(defun my/dired-home ()
  "Open dired at $HOME"
  (interactive)
  (dired (expand-file-name "~")))

(my-leader-def
  "ad" #'dired)
#+end_src
*** Addons
I used to use [[https://www.emacswiki.org/emacs/DiredPlus][dired+]], which provides a lot of extensions for dired functionality, but it also creates some new problems, so I opt out of it. Fortunately, the one feature I want from this package - adding more colors to dired buffers - is available as a separate package.

#+begin_src emacs-lisp
(use-package diredfl
  :straight t
  :after (dired)
  :config
  (diredfl-global-mode 1))
#+end_src

[[https://github.com/Fuco1/dired-hacks#dired-subtree][dired-subtree]] is a package that enables managing Dired buffers in a tree-like manner. By default =evil-collection= maps =dired-subtree-toggle= to =TAB=.
#+begin_src emacs-lisp
(use-package dired-subtree
  :after (dired)
  :straight t)

(defun my/dired-create-empty-file-subtree ()
  (interactive)
  (let ((default-directory (dired-current-directory)))
    (dired-create-empty-file
     (read-file-name "Create empty file: "))))
#+end_src

[[https://github.com/jojojames/dired-sidebar][dired-sidebar]] enables opening Dired in sidebar. For me, with dired-subtree this makes dired a better option than Treemacs.
#+begin_src emacs-lisp
(defun my/dired-sidebar-toggle ()
  (interactive)
  (if (not current-prefix-arg)
      (dired-sidebar-toggle-sidebar)
    (let ((dired-sidebar-follow-file-at-point-on-toggle-open
           current-prefix-arg)
          (current-prefix-arg nil))
      (dired-sidebar-toggle-sidebar))))

(use-package dired-sidebar
  :straight t
  :after (dired)
  :commands (dired-sidebar-toggle-sidebar)
  :init
  (setq dired-sidebar-follow-file-at-point-on-toggle-open nil)
  (general-define-key
   :keymaps '(normal override global)
   "C-n" `(my/dired-sidebar-toggle
           :wk "dired-sidebar"))
  :config
  (setq dired-sidebar-width 45)
  (defun my/dired-sidebar-setup ()
    (toggle-truncate-lines 1)
    (display-line-numbers-mode -1)
    (setq-local dired-subtree-use-backgrounds nil)
    (setq-local window-size-fixed nil))
  (general-define-key
   :keymaps 'dired-sidebar-mode-map
   :states '(normal emacs)
   "l" #'dired-sidebar-find-file
   "h" #'dired-sidebar-up-directory
   "=" #'dired-narrow)
  (add-hook 'dired-sidebar-mode-hook #'my/dired-sidebar-setup)
  (advice-add #'dired-create-empty-file :after 'dired-sidebar-refresh-buffer))
#+end_src

[[https://github.com/vifon/dired-recent.el][dired-recent.el]] adds history to dired.
#+begin_src emacs-lisp
(use-package dired-recent
  :straight t
  :after dired
  :commands (dired-recent-open)
  :config
  (dired-recent-mode)
  (general-define-key
   :keymaps 'dired-recent-mode-map
   "C-x C-d" nil)
  (my-leader-def
    "aD" '(dired-recent-open :wk "dired history")))
#+end_src

Display icons for files.

| Note      | Type                                                     |
|-----------+----------------------------------------------------------|
| *ACHTUNG* | This plugin is slow as hell with TRAMP or in =gnu/store= |

#+begin_src emacs-lisp
(use-package all-the-icons-dired
  :straight t
  :if (not (or my/slow-ssh (not (display-graphic-p))))
  :hook (dired-mode . (lambda ()
                        (unless (string-match-p "/gnu/store" default-directory)
                          (all-the-icons-dired-mode))))
  :config
  ;; (advice-add 'dired-add-entry :around #'all-the-icons-dired--propertize)
  ;; (advice-add 'dired-remove-entry :around #'all-the-icons-dired--propertize)
  ;; (advice-add 'dired-kill-subdir :around #'all-the-icons-dired--propertize)
  )
#+end_src

Provides stuff like =dired-open-xdg=
#+begin_src emacs-lisp
(use-package dired-open
  :straight t
  :commands (dired-open-xdg))
#+end_src

[[https://elpa.gnu.org/packages/dired-du.html][dired-du]] is a package that shows directory sizes
#+begin_src emacs-lisp
(use-package dired-du
  :straight t
  :commands (dired-du-mode)
  :config
  (setq dired-du-size-format t))
#+end_src

vifm-like filter
#+begin_src emacs-lisp
(use-package dired-narrow
  :straight t
  :commands (dired-narrow)
  :config
  (general-define-key
   :keymaps 'dired-narrow-map
   [escape] 'keyboard-quit))
#+end_src

Display git info, such as the last commit for file and stuff. It's pretty useful but also slows down Dired a bit, hence I don't turn it out by default.
#+begin_src emacs-lisp
(use-package dired-git-info
  :straight t
  :after dired
  :if (not my/slow-ssh)
  :config
  (general-define-key
   :keymap 'dired-mode-map
   :states '(normal emacs)
   ")" 'dired-git-info-mode))
#+end_src

[[https://github.com/SqrtMinusOne/avy-dired][avy-dired]] is my experimentation with Avy & Dired. It's somewhat unstable.
#+begin_src emacs-lisp
(use-package avy-dired
  :straight (:host github :repo "SqrtMinusOne/avy-dired")
  :after (dired)
  :init
  (my-leader-def "aa" #'avy-dired-goto-line))
#+end_src
*** Subdirectories
Subdirectories are one of the interesting features of Dired. It allows displaying multiple folders on the same window.

I add my own keybindings and some extra functionality.

#+begin_src emacs-lisp
(defun my/dired-open-this-subdir ()
  (interactive)
  (dired (dired-current-directory)))

(defun my/dired-kill-all-subdirs ()
  (interactive)
  (let ((dir dired-directory))
    (kill-buffer (current-buffer))
    (dired dir)))

(with-eval-after-load 'dired
  (general-define-key
   :states '(normal)
   :keymaps 'dired-mode-map
   "s" nil
   "ss" 'dired-maybe-insert-subdir
   "sl" 'dired-maybe-insert-subdir
   "sq" 'dired-kill-subdir
   "sk" 'dired-prev-subdir
   "sj" 'dired-next-subdir
   "sS" 'my/dired-open-this-subdir
   "sQ" 'my/dired-kill-all-subdirs
   (kbd "TAB") 'dired-hide-subdir))
#+end_src
*** TRAMP
TRAMP is a package that provides remote editing capacities. It is particularly useful for remote server management.

One of the reasons why TRAMP may be slow is that some plugins do too many requests to the filesystem. To debug these issues, set the following variable to 6:
#+begin_src emacs-lisp
(setq tramp-verbose 1)
#+end_src

To check if a file is remote, you can use ~file-remote-p~. E.g. ~(file-remote-p default-directory)~ for a current buffer. The problem with this approach is that it's rather awkward to add these checks in every hook, especially for global modes, so for now, I just set an environment variable for Emacs which disables these modes.

So far I have found the following problematic plugins:
| Plugin              | Note                                     | Solution                      |
|---------------------+------------------------------------------+-------------------------------|
| editorconfig        | looks for .editorconfig in the file tree | do not enable globally        |
| all-the-icons-dired | runs test on every file in the directory | disable                       |
| projectile          | looks for .git, .svn, etc                | advice ~projectile-file-name~ |
| lsp                 | does a whole lot of stuff                | disable                       |
| git-gutter          | runs git                                 | disable                       |
| vterm               | no proper TRAMP integration              | use eshell or shell           |

At any rate, it's usable, although not perfect.

Some other optimization settings:
#+begin_src emacs-lisp
(setq remote-file-name-inhibit-cache nil)
(setq vc-ignore-dir-regexp
      (format "\\(%s\\)\\|\\(%s\\)"
              vc-ignore-dir-regexp
              tramp-file-name-regexp))
#+end_src

Set the default shell to =bin/bash= for TRAMP or on a remote server.
#+begin_src emacs-lisp
(when (or my/remote-server my/slow-ssh)
  (setq explicit-shell-file-name "/bin/bash"))
#+end_src

Also, here is a hack to make TRAMP find =ls= on Guix:
#+begin_src emacs-lisp
(with-eval-after-load 'tramp
  (setq tramp-remote-path
        (append tramp-remote-path
                '(tramp-own-remote-path))))
#+end_src
*** Bookmarks
A simple bookmark list for Dired, mainly to use with TRAMP. I may look into a proper bookmarking system later.

Bookmarks are listed in the [[file:.emacs.d/private.el][private.el]] file, which has an expression like this:
#+begin_example emacs-lisp :tangle no
(setq my/dired-bookmarks
      '(("sudo" . "/sudo::/")))
#+end_example

The file itself is encrypted with yadm.
#+begin_src emacs-lisp
(defun my/dired-bookmark-open ()
  (interactive)
  (let ((bookmarks
         (mapcar
          (lambda (el) (cons (format "%-30s %s" (car el) (cdr el)) (cdr el)))
          my/dired-bookmarks)))
    (dired
     (cdr
      (assoc
       (completing-read "Dired: " bookmarks nil nil "^")
       bookmarks)))))
#+end_src
*** Integrations
A few functions to send files from Dired to various places.

First, a function to get the target buffer.
#+begin_src emacs-lisp
(defun my/get-good-buffer (buffer-major-mode prompt)
  (or
   (cl-loop
    for buf being the buffers
    if (eq (buffer-local-value 'major-mode buf) buffer-major-mode)
    collect buf into all-buffers
    if (and (eq (buffer-local-value 'major-mode buf) buffer-major-mode)
            (get-buffer-window buf t))
    collect buf into visible-buffers
    finally return (if (= (length visible-buffers) 1)
                       (car visible-buffers)
                     (if (= (length all-buffers) 1)
                         (car all-buffers)
                       (when-let ((buffers-by-name (mapcar (lambda (b)
                                                             (cons (buffer-name b) b))
                                                           all-buffers)))
                         (cdr
                          (assoc
                           (completing-read prompt buffers-by-name nil t)
                           buffers-by-name))))))
   (user-error "No buffer found!")))
#+end_src

Attach file to telega.
#+begin_src emacs-lisp
(defun my/dired-attach-to-telega (files telega-buffer)
  (interactive
   (list (dired-get-marked-files nil nil #'dired-nondirectory-p)
         (my/get-good-buffer 'telega-chat-mode "Telega buffer: ")))
  (unless files
    (user-error "No (non-directory) files selected"))
  (with-current-buffer telega-buffer
    (dolist (file files)
      (telega-chatbuf-attach-file file))))
#+end_src

Attach files to notmuch.
#+begin_src emacs-lisp
(defun my/dired-attach-to-notmuch (files notmuch-buffer)
  (interactive
   (list (dired-get-marked-files nil nil #'dired-nondirectory-p)
         (my/get-good-buffer 'notmuch-message-mode "Notmuch message buffer: ")))
  (unless files
    (user-error "No (non-directory) files selected"))
  (with-current-buffer notmuch-buffer
    (goto-char (point-max))
    (dolist (file files)
      (let ((type
             (or (mm-default-file-type file)
		         "application/octet-stream")))
        (mml-attach-file
         file
         type
         (mml-minibuffer-read-description)
         (mml-minibuffer-read-disposition type nil file))))))
#+end_src

Attach files to ement.
#+begin_src emacs-lisp
(defun my/dired-attach-to-ement (files ement-buffer)
  (interactive
   (list (dired-get-marked-files nil nil #'dired-nondirectory-p)
         (my/get-good-buffer 'ement-room-mode "Ement room buffer: ")))
  (unless files
    (user-error "No (non-directory) files selected"))
  (with-current-buffer ement-buffer
    (ement-with-room-and-session
      (dolist (file files)
        (ement-room-send-file
         file
         (read-from-minibuffer (format "Message body for %s: " file))
         ement-room
         ement-session)))))
#+end_src

Attach files to mastodon.
#+begin_src emacs-lisp
(defun my/dired-attach-to-mastodon (files mastodon-buffer)
  (interactive
   (list (dired-get-marked-files nil nil #'dired-nondirectory-p)
         (or (cl-loop for buf being the buffers
                      if (eq (buffer-local-value 'mastodon-toot-mode buf) t)
                      return buf)
             (user-error "No buffer found!"))))
  (unless files
    (user-error "No (non-directory) files selected"))
  (with-current-buffer mastodon-buffer
    (dolist (file files)
      (mastodon-toot--attach-media
       file
       (read-from-minibuffer (format "Description for %s: " file))))))
#+end_src

And the keybindings:
#+begin_src emacs-lisp
(with-eval-after-load 'dired
  (general-define-key
   :states '(normal)
   :keymaps 'dired-mode-map
   "a" nil
   "at" #'my/dired-attach-to-telega
   "am" #'my/dired-attach-to-notmuch
   "ai" #'my/dired-attach-to-ement
   "an" #'my/dired-attach-to-mastodon))
#+end_src
** Shells / Terminals
*** vterm
My terminal emulator of choice.

References:
- [[https://github.com/akermu/emacs-libvterm][emacs-libvterm repo]]

**** Configuration
On Guix it makes more sense to use the Guix package to avoid building the vterm module, but obviously not an option on termux, hence this:

#+begin_src emacs-lisp
(when my/is-termux
  (straight-use-package 'vterm))
#+end_src

The actual config:
#+begin_src emacs-lisp
(use-package vterm
  :commands (vterm vterm-other-window)
  :config
  (setq vterm-kill-buffer-on-exit t)

  (add-hook 'vterm-mode-hook
            (lambda ()
              (setq-local global-display-line-numbers-mode nil)
              (display-line-numbers-mode 0)))


  (advice-add 'evil-collection-vterm-insert
              :before (lambda (&rest args)
                        (ignore-errors
                          (apply #'vterm-reset-cursor-point args))))

  (general-define-key
   :keymaps 'vterm-mode-map
   "M-q" 'vterm-send-escape

   "C-h" 'evil-window-left
   "C-l" 'evil-window-right
   "C-k" 'evil-window-up
   "C-j" 'evil-window-down

   "C-<right>" 'evil-window-right
   "C-<left>" 'evil-window-left
   "C-<up>" 'evil-window-up
   "C-<down>" 'evil-window-down

   "M-<left>" 'vterm-send-left
   "M-<right>" 'vterm-send-right
   "M-<up>" 'vterm-send-up
   "M-<down>" 'vterm-send-down)

  (general-define-key
   :keymaps 'vterm-mode-map
   :states '(normal insert)
   "<home>" 'vterm-beginning-of-line
   "<end>" 'vterm-end-of-line)

  (general-define-key
   :keymaps 'vterm-mode-map
   :states '(insert)
   "C-r" 'vterm-send-C-r
   "C-k" 'vterm-send-C-k
   "C-j" 'vterm-send-C-j
   "M-l" 'vterm-send-right
   "M-h" 'vterm-send-left
   "M-k" 'vterm-send-up
   "M-j" 'vterm-send-down))
#+end_src
**** Subterminal
Open a terminal in the lower third of the frame with the =`= key.

I guess that's the first Emacs function I wrote!

#+begin_src emacs-lisp
(add-to-list 'display-buffer-alist
             `(,"vterm-subterminal.*"
               (display-buffer-reuse-window
                display-buffer-in-side-window)
               (side . bottom)
               (reusable-frames . visible)
               (window-height . 0.33)))

(defun my/toggle-vterm-subteminal ()
  "Toogle subteminal."
  (interactive)
  (let ((vterm-window
        (seq-find
         (lambda (window)
           (string-match
            "vterm-subterminal.*"
            (buffer-name (window-buffer window))))
         (window-list))))
    (if vterm-window
        (if (eq (get-buffer-window (current-buffer)) vterm-window)
            (kill-buffer (current-buffer))
          (select-window vterm-window))
      (vterm-other-window "vterm-subterminal"))))

(unless my/slow-ssh
  (general-nmap "`" 'my/toggle-vterm-subteminal)
  (general-nmap "~" 'vterm))
#+end_src
**** Dired integration
A function to get pwd for vterm. Couldn't find a built-in function for some reason, but this seems work fine:

#+begin_src emacs-lisp
(defun my/vterm-get-pwd ()
  (if vterm--process
      (file-truename (format "/proc/%d/cwd" (process-id vterm--process)))
    default-directory))
#+end_src

Now we can open dired for vterm pwd:
#+begin_src emacs-lisp
(defun my/vterm-dired-other-window ()
  "Open dired in vterm pwd in other window"
  (interactive)
  (dired-other-window (my/vterm-get-pwd)))

(defun my/vterm-dired-replace ()
  "Replace vterm with dired"
  (interactive)
  (let ((pwd (my/vterm-get-pwd)))
    (kill-process vterm--process)
    (dired pwd)))
#+end_src

The second function is particularly handy because that way I can alternate between vterm and dired.

Keybindings:
#+begin_src emacs-lisp
(with-eval-after-load 'vterm
  (general-define-key
   :keymaps 'vterm-mode-map
   :states '(normal)
   "gd" #'my/vterm-dired-other-window
   "gD" #'my/vterm-dired-replace))
#+end_src
**** With-editor integration
A package used by Magit to use the current Emacs instance as the =$EDITOR=.

That is, with the help of [[file:Console.org::Functions][this function]], I can just write =e <filename>=, edit the file, and then return to the same vterm buffer. No more running vim inside Emacs.

#+begin_src emacs-lisp
(use-package with-editor
  :straight t
  :after (vterm)
  :config
  (add-hook 'vterm-mode-hook 'with-editor-export-editor))
#+end_src
*** eshell
A shell written in Emacs lisp. I don't use it as of now, but keep the config just in case.

#+begin_src emacs-lisp
(defun my/configure-eshell ()
  (add-hook 'eshell-pre-command-hook 'eshell-save-some-history)
  (add-to-list 'eshell-output-filter-functions 'eshell-truncate-buffer)
  (setq eshell-history-size 10000)
  (setq eshell-hist-ingnoredups t)
  (setq eshell-buffer-maximum-lines 10000)

  (evil-define-key '(normal insert visual) eshell-mode-map (kbd "<home>") 'eshell-bol)
  (evil-define-key '(normal insert visual) eshell-mode-map (kbd "C-r") 'counsel-esh-history)
  (general-define-key
   :states '(normal)
   :keymaps 'eshell-mode-map
   (kbd "C-h") 'evil-window-left
   (kbd "C-l") 'evil-window-right
   (kbd "C-k") 'evil-window-up
   (kbd "C-j") 'evil-window-down))

(use-package eshell
  :ensure nil
  :after evil-collection
  :commands (eshell)
  :init
  (my/use-colors
   (epe-pipeline-delimiter-face :foreground (my/color-value 'green))
   (epe-pipeline-host-face      :foreground (my/color-value 'blue))
   (epe-pipeline-time-face      :foreground (my/color-value 'yellow))
   (epe-pipeline-user-face      :foreground (my/color-value 'red)))
  :config
  (add-hook 'eshell-first-time-mode-hook 'my/configure-eshell 90)
  (when my/slow-ssh
    (add-hook 'eshell-mode-hook
              (lambda ()
                (setq-local company-idle-delay 1000))))
  (setq eshell-banner-message ""))

(use-package aweshell
  :straight (:repo "manateelazycat/aweshell" :host github)
  :after eshell
  :init
  (my/use-colors
   (aweshell-alert-buffer-face  :background (color-darken-name (my/color-value 'bg) 3))
   (aweshell-alert-command-face :foreground (my/color-value 'red) :weight 'bold))
  :config
  (setq eshell-prompt-regexp "^[^#\nλ]* λ[#]* ")
  (setq eshell-highlight-prompt t)
  (setq eshell-prompt-function 'epe-theme-pipeline))

(use-package eshell-info-banner
  :defer t
  :if (not my/slow-ssh)
  :straight (eshell-info-banner :type git
                                :host github
                                :repo "phundrak/eshell-info-banner.el")
  :hook (eshell-banner-load . eshell-info-banner-update-banner)
  :config
  (setq eshell-info-banner-filter-duplicate-partitions t)
  (setq eshell-info-banner-exclude-partitions '("b/efi")))

(when (or my/slow-ssh my/remote-server)
  (general-nmap "`" 'aweshell-dedicated-toggle)
  (general-nmap "~" 'eshell))
#+end_src
*** shell
Interactive subshell (=M-x shell=) is a way to run commands with input and output through an Emacs buffer.

#+begin_src emacs-lisp
(defun my/setup-shell ()
  (setq-local comint-use-prompt-regexp t)
  (setq-local comint-prompt-read-only t))

(add-hook 'shell-mode-hook #'my/setup-shell)
#+end_src
** Managing dotfiles
A bunch of functions for managing dotfiles with yadm.

*** Open Emacs config
#+begin_src emacs-lisp
(general-define-key
 ;; "C-c c" (my/command-in-persp "Emacs.org" "conf" 1 (find-file "~/Emacs.org"))
 "C-c c" `(,(lambda () (interactive) (find-file "~/Emacs.org")) :wk "Emacs.org"))

(my-leader-def
  :infix "c"
  "" '(:which-key "configuration")
  ;; "c" (my/command-in-persp "Emacs.org" "conf" 1 (find-file "~/Emacs.org"))
  "c" `(,(lambda () (interactive) (find-file "~/Emacs.org")) :wk "Emacs.org"))
#+end_src
*** Open Magit for yadm
Idea:

- [[https://www.reddit.com/r/emacs/comments/gjukb3/yadm_magit/]]

#+begin_src emacs-lisp
(with-eval-after-load 'tramp
  (add-to-list 'tramp-methods
               `("yadm"
                 (tramp-login-program "yadm")
                 (tramp-login-args (("enter")))
                 (tramp-login-env (("SHELL") "/bin/sh"))
                 (tramp-remote-shell "/bin/sh")
                 (tramp-remote-shell-args ("-c")))))


(defun my/yadm-magit ()
  (interactive)
  (magit-status "/yadm::"))

(my-leader-def "cm" 'my/yadm-magit)
#+end_src
*** Open a dotfile
Open a file managed by yadm.

#+begin_src emacs-lisp
(defun my/open-yadm-file ()
  "Open a file managed by yadm"
  (interactive)
  (find-file
   (concat
    (file-name-as-directory (getenv "HOME"))
    (completing-read
     "yadm files: "
     (split-string
      (shell-command-to-string "yadm ls-files $HOME --full-name") "\n")))))

(general-define-key
 "C-c f" '(my/open-yadm-file :wk "yadm file"))

(my-leader-def
  "cf" '(my/open-yadm-file :wk "yadm file"))
#+end_src
** Elfeed
[[https://github.com/skeeto/elfeed][elfeed]] is one of the most popular Emacs packages, and it's also one in which I ended up investing a lot of effort.

There's a lot of stuff in this section, so it's here and not in "Internet and Multimedia".

*** General settings
The advice there sets =shr-use-fonts= to nil while rendering HTML, so the =elfeed-show= buffer will use monospace font.

Using my own fork until the modifications are merged into master.

#+begin_src emacs-lisp
(use-package elfeed
  :straight (:repo "SqrtMinusOne/elfeed" :host github)
  :if (not (or my/is-termux my/remote-server))
  :commands (elfeed)
  :init
  (my-leader-def "ae" #'elfeed-summary)
  (my/persp-add-rule
    elfeed-summary-mode 0 "elfeed"
    elfeed-search-mode 0 "elfeed"
    elfeed-show-mode 0 "elfeed")
  (setq shr-max-image-proportion 0.5)
  :config
  (setq elfeed-db-directory "~/.elfeed")
  (setq elfeed-enclosure-default-dir (expand-file-name "~/Downloads"))
  ;; (advice-add #'elfeed-insert-html
  ;;             :around
  ;;             (lambda (fun &rest r)
  ;;               (let ((shr-use-fonts nil))
  ;;                 (apply fun r))))
  (general-define-key
   :states '(normal)
   :keymaps 'elfeed-search-mode-map
   "o" #'my/elfeed-search-filter-source
   "c" #'elfeed-search-clear-filter
   "gl" (lambda () (interactive) (elfeed-search-set-filter "+later")))
  (general-define-key
   :states '(normal)
   :keymaps 'elfeed-show-mode-map
   "ge" #'my/elfeed-show-visit-eww))
#+end_src

[[https://github.com/remyhonig/elfeed-org][elfeed-org]] allows configuring Elfeed feeds with an Org file.
#+begin_src emacs-lisp
(use-package elfeed-org
  :straight t
  :after (elfeed)
  :config
  (setq rmh-elfeed-org-files '("~/.emacs.d/private.org"))
  (elfeed-org))
#+end_src
*** Some additions
Filter elfeed search buffer by the feed under the cursor.
#+begin_src emacs-lisp
(defun my/elfeed-search-filter-source (entry)
  "Filter elfeed search buffer by the feed under cursor."
  (interactive (list (elfeed-search-selected :ignore-region)))
  (when (elfeed-entry-p entry)
    (elfeed-search-set-filter
     (concat
      "@6-months-ago "
      "+unread "
      "="
      (replace-regexp-in-string
       (rx "?" (* not-newline) eos)
       ""
       (elfeed-feed-url (elfeed-entry-feed entry)))))))
#+end_src

Open a URL with eww.
#+begin_src emacs-lisp
(defun my/elfeed-show-visit-eww ()
  "Visit the current entry in eww"
  (interactive)
  (let ((link (elfeed-entry-link elfeed-show-entry)))
    (when link
      (eww link))))
#+end_src
*** Custom faces
Setting up custom faces for certain tags to make the feed look a bit nicer.

#+begin_src emacs-lisp
(defface elfeed-videos-entry nil
  "Face for the elfeed entries with tag \"videos\"")

(defface elfeed-twitter-entry nil
  "Face for the elfeed entries with tah \"twitter\"")

(defface elfeed-emacs-entry nil
  "Face for the elfeed entries with tah \"emacs\"")

(defface elfeed-music-entry nil
  "Face for the elfeed entries with tah \"music\"")

(defface elfeed-podcasts-entry nil
  "Face for the elfeed entries with tag \"podcasts\"")

(defface elfeed-blogs-entry nil
  "Face for the elfeed entries with tag \"blogs\"")

(defface elfeed-govt-entry nil
  "Face for the elfeed entries with tag \"blogs\"")

(my/use-colors
 (elfeed-search-tag-face :foreground (my/color-value 'yellow))
 (elfeed-videos-entry :foreground (my/color-value 'red))
 (elfeed-twitter-entry :foreground (my/color-value 'blue))
 (elfeed-emacs-entry :foreground (my/color-value 'magenta))
 (elfeed-music-entry :foreground (my/color-value 'green))
 (elfeed-podcasts-entry :foreground (my/color-value 'yellow))
 (elfeed-blogs-entry :foreground (my/color-value 'orange))
 (elfeed-govt-entry :foreground (my/color-value 'dark-cyan)))

(with-eval-after-load 'elfeed
  (setq elfeed-search-face-alist
        '((podcasts elfeed-podcasts-entry)
          (music elfeed-music-entry)
          (gov elfeed-govt-entry)
          (twitter elfeed-twitter-entry)
          (videos elfeed-videos-entry)
          (emacs elfeed-emacs-entry)
          (blogs elfeed-blogs-entry)
          (unread elfeed-search-unread-title-face))))
#+end_src
*** elfeed-summary
[[https://github.com/SqrtMinusOne/elfeed-summary][elfeed-summary]] is my package that provides a feed summary interface for elfeed.

The default interface of elfeed is just a list of all entries, so it gets hard to navigate when there are a lot of sources with varying frequencies of posts. This is my attempt to address this issue.

#+begin_src emacs-lisp
(use-package elfeed-summary
  :commands (elfeed-summary)
  :straight t
  :config
  (setq elfeed-summary-filter-by-title t))
#+end_src
*** elfeed-sync
[[https://github.com/SqrtMinusOne/elfeed-sync][elfeed-sync]] is my package to sync elfeed with [[https://tt-rss.org/][tt-rss]].

#+begin_src emacs-lisp
(use-package elfeed-sync
  :straight (:host github :repo "SqrtMinusOne/elfeed-sync")
  :if (not my/remote-server)
  :after elfeed
  :config
  (elfeed-sync-mode)
  (setq elfeed-sync-tt-rss-instance "https://sqrtminusone.xyz/tt-rss")
  (setq elfeed-sync-tt-rss-login "sqrtminusone")
  (setq elfeed-sync-tt-rss-password (my/password-store-get "Selfhosted/tt-rss")))
#+end_src
*** YouTube, podcasts & EMMS
Previously this block was opening MPV with =start-process=, but now I've managed to hook up MPV with EMMS. So there is the EMMS+elfeed "integration".

There are multiple kinds of entries that I want to be opened by EMMS. First, a function that returns a YouTube URL:
#+begin_src emacs-lisp
(defun my/get-youtube-url (entry)
  (let ((watch-id (cadr
                   (assoc "watch?v"
                          (url-parse-query-string
                           (substring
                            (url-filename
                             (url-generic-parse-url (elfeed-entry-link entry)))
                            1))))))
    (when watch-id
      (concat "https://www.youtube.com/watch?v=" watch-id))))
#+end_src

Second, a function that returns a URL to an enclosure. This is generally how podcasts are distributed.
#+begin_src emacs-lisp
(defun my/get-enclosures-url (entry)
  (caar (elfeed-entry-enclosures entry)))
#+end_src

And a package called [[https://github.com/karthink/elfeed-tube][elfeed-tube]] to fetch some additional data from YouTUbe.
#+begin_src emacs-lisp
(use-package elfeed-tube
  :straight t
  :after elfeed
  :config
  (setq elfeed-tube-auto-fetch-p nil)
  (elfeed-tube-setup)
  (general-define-key
   :states 'normal
   :keymaps '(elfeed-search-mode-map elfeed-show-mode-map)
   "gf" #'elfeed-tube-fetch))
#+end_src

Now, a function to add a YouTube link with metadata from elfeed to EMMS.
#+begin_src emacs-lisp
(with-eval-after-load 'emms
  (define-emms-source elfeed (entry)
    (let ((url (or (my/get-enclosures-url entry)
                   (my/get-youtube-url entry))))
      (unless url
        (error "URL not found"))
      (let ((track (emms-track 'url url)))
        (emms-track-set track 'info-title (elfeed-entry-title entry))
        (emms-playlist-insert-track track)))))

(defun my/elfeed-add-emms ()
  (interactive)
  (emms-add-elfeed elfeed-show-entry)
  (elfeed-tag elfeed-show-entry 'watched)
  (elfeed-show-refresh))

(with-eval-after-load 'elfeed
  (general-define-key
   :states '(normal)
   :keymaps 'elfeed-show-mode-map
   "gm" #'my/elfeed-add-emms))
#+end_src
*** rdrview
[[https://github.com/eafer/rdrview][rdrview]] is a command-line tool to strip webpages from clutter, extracting only parts related to the actual content. It's a standalone port of the corresponding feature of Firefox, called [[https://support.mozilla.org/en-US/kb/firefox-reader-view-clutter-free-web-pages][Reader View]].

| Guix dependency |
|-----------------|
| rdrview         |

It seems like the tool [[https://repology.org/project/rdrview/versions][isn't available]] in a whole lot of package repositories, but it's pretty easy to compile. I've put together a [[https://github.com/SqrtMinusOne/channel-q/blob/master/rdrview.scm][Guix definition]], which /one day/ I'll submit to the upstream.

**** Integrating rdrview with Emacs
Let's start by integrating =rdrview= with Emacs. In the general case, we want to fetch both metadata and the actual content from the page.

However, the interface of =rdrview= is a bit awkward in this part, so we have the following options:
- call =rdrview= two times: with =-M= flag to fetch the metadata, and without the flag to fetch the HTML;
- call =rdrview= with =-T= flag to append the metadata to the resulting HTML.

I've decided to go with the second option. Here is a function that calls rdrview with the required flags:
#+begin_src emacs-lisp
(defun my/rdrview-get (url callback)
  "Get the rdrview representation of URL.

Call CALLBACK with the output."
  (let* ((buffer (generate-new-buffer "rdrview"))
         (proc (start-process "rdrview" buffer "rdrview"
                              url "-T" "title,sitename,body"
                              "-H")))
    (set-process-sentinel
     proc
     (lambda (process _msg)
       (let ((status (process-status process))
             (code (process-exit-status process)))
         (cond ((and (eq status 'exit) (= code 0))
                (progn
                  (funcall callback
                           (with-current-buffer (process-buffer process)
                             (buffer-string)))
                  (kill-buffer (process-buffer process))) )
               ((or (and (eq status 'exit) (> code 0))
                    (eq status 'signal))
                (let ((err (with-current-buffer (process-buffer process)
                             (buffer-string))))
                  (kill-buffer (process-buffer process))
                  (user-error "Error in rdrview: %s" err)))))))
    proc))
#+end_src

The function calls =callback= with the output of =rdrview=. This usually doesn't take long, but it's still nice to avoid freezing Emacs that way.

Now we have to parse the output. The =-T= flag puts the title in the =<h1>= tag, the site name site in the =<h2>= tag, and the content in a =<div>=. What's more, headers of the content are often shifted, e.g. the top-level header may well end up being and =<h2>= or =<h3>=, which does not look great in LaTeX.

With that said, here's a function that does the required changes:
#+begin_src emacs-lisp
(defun my/rdrview-parse (dom-string)
  (let ((dom (with-temp-buffer
               (insert dom-string)
               (libxml-parse-html-region (point-min) (point-max)))))
    (let (title sitename content (i 0))
      (dolist (child (dom-children (car (dom-by-id dom "readability-page-1"))))
        (when (listp child)
          (cond
           ((eq (car child) 'h1)
            (setq title (dom-text child)))
           ((eq (car child) 'h2)
            (setq sitename (dom-text child)))
           ((eq (car child) 'div)
            (setq content child)))))
      (while (and
              (not (dom-by-tag content 'h1))
              (dom-search
               content
               (lambda (el)
                 (when (listp el)
                   (pcase (car el)
                     ('h2 (setf (car el) 'h1))
                     ('h3 (setf (car el) 'h2))
                     ('h4 (setf (car el) 'h3))
                     ('h5 (setf (car el) 'h4))
                     ('h6 (setf (car el) 'h5))))))))
      `((title . ,title)
        (sitename . ,sitename)
        (content . ,(with-temp-buffer
                      (dom-print content)
                      (buffer-string)))))))
#+end_src

**** Using rdrview from elfeed
Because I didn't find a smart way to advise the desired behavior into elfeed, here's a modification of the =elfeed-show-refresh--mail-style= function with two changes:
- it uses =rdrview= to fetch the HTML;
- it saves the resulting HTML into a buffer-local variable (we'll need that later).

#+begin_src emacs-lisp
(defvar-local my/elfeed-show-rdrview-html nil)

(defun my/rdrview-elfeed-show ()
  (interactive)
  (unless elfeed-show-entry
    (user-error "No elfeed entry in this buffer!"))
  (my/rdrview-get
   (elfeed-entry-link elfeed-show-entry)
   (lambda (result)
     (let* ((data (my/rdrview-parse result))
            (inhibit-read-only t)
            (title (elfeed-entry-title elfeed-show-entry))
            (date (seconds-to-time (elfeed-entry-date elfeed-show-entry)))
            (authors (elfeed-meta elfeed-show-entry :authors))
            (link (elfeed-entry-link elfeed-show-entry))
            (tags (elfeed-entry-tags elfeed-show-entry))
            (tagsstr (mapconcat #'symbol-name tags ", "))
            (nicedate (format-time-string "%a, %e %b %Y %T %Z" date))
            (content (alist-get 'content data))
            (feed (elfeed-entry-feed elfeed-show-entry))
            (feed-title (elfeed-feed-title feed))
            (base (and feed (elfeed-compute-base (elfeed-feed-url feed)))))
       (erase-buffer)
       (insert (format (propertize "Title: %s\n" 'face 'message-header-name)
                       (propertize title 'face 'message-header-subject)))
       (when elfeed-show-entry-author
         (dolist (author authors)
           (let ((formatted (elfeed--show-format-author author)))
             (insert
              (format (propertize "Author: %s\n" 'face 'message-header-name)
                      (propertize formatted 'face 'message-header-to))))))
       (insert (format (propertize "Date: %s\n" 'face 'message-header-name)
                       (propertize nicedate 'face 'message-header-other)))
       (insert (format (propertize "Feed: %s\n" 'face 'message-header-name)
                       (propertize feed-title 'face 'message-header-other)))
       (when tags
         (insert (format (propertize "Tags: %s\n" 'face 'message-header-name)
                         (propertize tagsstr 'face 'message-header-other))))
       (insert (propertize "Link: " 'face 'message-header-name))
       (elfeed-insert-link link link)
       (insert "\n")
       (cl-loop for enclosure in (elfeed-entry-enclosures elfeed-show-entry)
                do (insert (propertize "Enclosure: " 'face 'message-header-name))
                do (elfeed-insert-link (car enclosure))
                do (insert "\n"))
       (insert "\n")
       (if content
           (elfeed-insert-html content base)
         (insert (propertize "(empty)\n" 'face 'italic)))
       (setq-local my/elfeed-show-rdrview-html content)
       (goto-char (point-min))))))
#+end_src

That way, calling =M-x my/rdrview-elfeed-show= replaces the original content with one from =rdrview=.

#+begin_src emacs-lisp
(with-eval-after-load 'elfeed
  (general-define-key
   :states '(normal)
   :keymaps 'elfeed-show-mode-map
   "gp" #'my/rdrview-elfeed-show))
#+end_src

**** How well does it work?
Rather ironically, it works well with sites that already ship with proper RSS, like [[https://protesilaos.com/][Protesilaos Stavrou's]] or [[https://karthinks.com/software/simple-folding-with-hideshow/][Karthik Chikmagalur's]] blogs or [[https://www.theatlantic.com/world/][The Atlantic]] magazine.

Of my other subscriptions, it does a pretty good job with [[https://www.theverge.com/][The Verge]], which by default sends entries truncated by the words "Read the full article". For [[https://arstechnica.com/][Ars Technica]], it works only if the story is not large enough, otherwise the site returns its HTML-based pagination interface.

For paywalled sites such as [[https://www.nytimes.com/][New York Times]] or [[https://www.economist.com/][The Economist]], this usually doesn't work (by the way, what's the problem with providing individual RSS feeds for subscribers?). If you need this kind of thing, I'd suggest using the [[https://github.com/RSS-Bridge/rss-bridge][RSS-Bridge]] project. And if something is not available, contributing business logic there definitely makes more sense than implementing workarounds in Emacs Lisp.
*** LaTeX and pandoc
However, I also find that I'm not really a fan of reading articles from Emacs. Somehow what works for program code doesn't work that well for natural text. When I have to, I usually switch the Emacs theme to a light one.

But the best solution I've found so far is to render the required articles as PDFs. I may even print out some large articles I want to read.

**** Template
So first, we need a LaTeX template. Pandoc already ships with one, but I don't like it too much, so I've put up a template from my LaTeX styles, targeting my preferred XeLaTeX engine.

The code for the template is available [[file:.emacs.d/rdrview.tex][dotfiles repo]]. If you use LaTeX, you'll probably be better off using your own setup. Be sure to define the following variables:
- =main-lang= and =other-lang= for polyglossia (or remove them if you have only one language)
- =title=
- =subtitle=
- =author=
- =date=

**** Invoking pandoc
Now that we have the template, let's save it somewhere and store the path to a variable:
#+begin_src emacs-lisp
(setq my/rdrview-template (expand-file-name
                           (concat user-emacs-directory "rdrview.tex")))
#+end_src

And let's invoke pandoc. We need to pass the following flags:
- =--pdf-engine=xelatex=, of course
- =--template <path-to-template>=;
- =-o <path-to-pdf>=;
- =--variable key=value=.

In fact, pandoc is a pretty awesome tool in the sense that it allows for feeding custom variables to rich-language templates.

So, the rendering function is as follows:
#+begin_src emacs-lisp
(cl-defun my/rdrview-render (content type variables callback
                                     &key file-name overwrite)
  "Render CONTENT with pandoc.

TYPE is a file extension as supported by pandoc, for instance,
html or txt.  VARIABLES is an alist that is fed into the
template.  After the rendering is complete successfully, CALLBACK
is called with the resulting PDF.

FILE-NAME is a path to the resulting PDF. If nil it's generated
randomly.

If a file with the given FILE-NAME already exists, the function will
invoke CALLBACK straight away without doing the rendering, unless
OVERWRITE is non-nil."
  (unless file-name
    (setq file-name (format "/tmp/%d.pdf" (random 100000000))))
  (let (params
        (temp-file-name (format "/tmp/%d.%s" (random 100000000) type)))
    (cl-loop for (key . value) in variables
             when value
             do (progn
                  (push "--variable" params)
                  (push (format "%s=%s" key value) params)))
    (setq params (nreverse params))
    (if (and (file-exists-p file-name) (not overwrite))
        (funcall callback file-name)
      (with-temp-file temp-file-name
        (insert content))
      (let ((proc (apply #'start-process
                         "pandoc" (get-buffer-create "*Pandoc*") "pandoc"
                         temp-file-name "-o" file-name
                         "--pdf-engine=xelatex" "--template" my/rdrview-template
                         params)))
        (set-process-sentinel
         proc
         (lambda (process _msg)
           (let ((status (process-status process))
                 (code (process-exit-status process)))
             (cond ((and (eq status 'exit) (= code 0))
                    (progn
                      (message "Done!")
                      (funcall callback file-name)))
                   ((or (and (eq status 'exit) (> code 0))
                        (eq status 'signal))
                    (user-error "Error in pandoc. Check the *Pandoc* buffer"))))))))))
#+end_src

**** Opening elfeed entries
Now we have everything required to open elfeed entries.

Also, in my case elfeed entries come in two languages, so I have to set =main-lang= and =other-lang= variables accordingly. Here's the main function:
#+begin_src emacs-lisp
(setq my/elfeed-pdf-dir (expand-file-name "~/.elfeed/pdf/"))

(defun my/elfeed-open-pdf (entry overwrite)
  "Open the current elfeed ENTRY with a pdf viewer.

If OVERWRITE is non-nil, do the rendering even if the resulting
PDF already exists."
  (interactive (list elfeed-show-entry current-prefix-arg))
  (let ((authors (mapcar (lambda (m) (plist-get m :name)) (elfeed-meta entry :authors)))
        (feed-title (elfeed-feed-title (elfeed-entry-feed entry)))
        (tags (mapconcat #'symbol-name (elfeed-entry-tags entry) ", "))
        (date (format-time-string "%a, %e %b %Y"
                                  (seconds-to-time (elfeed-entry-date entry))))
        (content (elfeed-deref (elfeed-entry-content entry)))
        (file-name (concat my/elfeed-pdf-dir
                           (elfeed-ref-id (elfeed-entry-content entry))
                           ".pdf"))
        (main-language "english")
        (other-language "russian"))
    (unless content
      (user-error "No content!"))
    (setq subtitle
          (cond
           ((seq-empty-p authors) feed-title)
           ((and (not (seq-empty-p (car authors)))
                 (string-match-p (regexp-quote (car authors)) feed-title)) feed-title)
           (t (concat (string-join authors ", ") "\\\\" feed-title))))
    (when (member 'ru (elfeed-entry-tags entry))
      (setq main-language "russian")
      (setq other-language "english"))
    (my/rdrview-render
     (if (bound-and-true-p my/elfeed-show-rdrview-html)
         my/elfeed-show-rdrview-html
       content)
     (elfeed-entry-content-type entry)
     `((title . ,(elfeed-entry-title entry))
       (subtitle . ,subtitle)
       (date . ,date)
       (tags . ,tags)
       (main-lang . ,main-language)
       (other-lang . ,other-language))
     (lambda (file-name)
       (start-process "xdg-open" nil "xdg-open" file-name))
     :file-name file-name
     :overwrite current-prefix-arg)))
#+end_src

If the =my/elfeed-show-rdrview-html= variable is bound and true, then the content in this buffer was retrieved via =rdrview=, so we'll use that instead of the output of =elfeed-deref=.

#+begin_src emacs-lisp
(with-eval-after-load 'elfeed
  (general-define-key
   :keymaps '(elfeed-show-mode-map)
   :states '(normal)
   "gv" #'my/elfeed-open-pdf))
#+end_src

Now we can open elfeed entries in a PDF viewer, which I find much nicer to read. Given that RSS feeds generally ship with simpler HTML than the regular websites, results usually look awesome.

**** Opening arbitrary sites
As you may have noticed, we also can display arbitrary web pages with this setup, so let's go ahead and implement that:

#+begin_src emacs-lisp
(defun my/get-languages (url)
  (let ((main-lang "english")
        (other-lang "russian"))
    (when (string-match-p (rx ".ru") url)
      (setq main-lang "russian"
            other-lang "english"))
    (list main-lang other-lang)))

(defun my/rdrview-open (url overwrite)
  (interactive
   (let ((url (read-from-minibuffer
               "URL: "
               (if (bound-and-true-p elfeed-show-entry)
                   (elfeed-entry-link elfeed-show-entry)))))
     (when (string-empty-p url)
       (user-error "URL is empty"))
     (list url current-prefix-arg)))
  (my/rdrview-get
   url
   (lambda (res)
     (let ((data (my/rdrview-parse res))
           (langs (my/get-languages url)))
       (my/rdrview-render
        (alist-get 'content data)
        'html
        `((title . ,(alist-get 'title data))
          (subtitle . ,(alist-get 'sitename data))
          (main-lang . ,(nth 0 langs))
          (other-lang . ,(nth 1 langs)))
        (lambda (file-name)
          (start-process "xdg-open" nil "xdg-open" file-name)))))))
#+end_src

Unfortunately, this part doesn't work that well, so we can't just uninstall Firefox or Chromium and browse the web from a PDF viewer.

The most common problem I've encountered is incorrectly formed pictures, such as =.png= files without the boundary info. I'm sure you've also come across this if you ever tried to insert a lot of Internet pictures into a LaTeX document.

However, sans the pictures issue, for certain sites like Wikipedia this is usable.
*** YouTube transcripts
**** Getting subtitles
Finally, let's get to transcripts.

| Guix package                  |
|-------------------------------|
| python-youtube-transcript-api |

In principle, the YouTube API allows for downloading subtitles, but I've found [[https://github.com/jdepoix/youtube-transcript-api][this awesome Python script]] which does the same. You can install it from =pip=, or here's mine [[https://github.com/SqrtMinusOne/channel-q/blob/master/youtube-transcript-api.scm][Guix definition]] once again.

Much like the previous cases, we need to invoke the program and save the output. The [[https://en.wikipedia.org/wiki/WebVTT][WebVTT]] format will work well enough for our purposes. Here comes the function:
#+begin_src emacs-lisp
(cl-defun my/youtube-subtitles-get (video-id callback &key file-name overwrite)
  "Get subtitles for VIDEO-ID in WebVTT format.

Call CALLBACK when done.

FILE-NAME is a path to the resulting WebVTT file. If nil it's
generated randomly.

If a file with the given FILE-NAME already exists, the function will
invoke CALLBACK straight away without doing the rendering, unless
OVERWRITE is non-nil."
  (unless file-name
    (setq file-name (format "/tmp/%d.vtt" (random 100000000))))
  (if (and (file-exists-p file-name) (not overwrite))
      (funcall callback file-name)
    (let* ((buffer (generate-new-buffer "youtube-transcripts"))
           (proc (start-process "youtube_transcript_api" buffer
                                "youtube_transcript_api" video-id
                                "--languages" "en" "ru" "de"
                                "--format" "webvtt")))
      (set-process-sentinel
       proc
       (lambda (process _msg)
         (let ((status (process-status process))
               (code (process-exit-status process)))
           (cond ((and (eq status 'exit) (= code 0))
                  (progn
                    (with-current-buffer (process-buffer process)
                      (setq buffer-file-name file-name)
                      (save-buffer))
                    (kill-buffer (process-buffer process))
                    (funcall callback file-name)))
                 ((or (and (eq status 'exit) (> code 0))
                      (eq status 'signal))
                  (let ((err (with-current-buffer (process-buffer process)
                               (buffer-string))))
                    (kill-buffer (process-buffer process))
                    (user-error "Error in youtube_transcript_api: %s" err)))))))
      proc)))
#+end_src
**** elfeed and subed
Now that we have a standalone function, let's invoke it with the current =elfeed-show-entry=:

#+begin_src emacs-lisp
(setq my/elfeed-srt-dir (expand-file-name "~/.elfeed/srt/"))

(defun my/elfeed-youtube-subtitles (entry &optional arg)
  "Get subtitles for the current elfeed ENTRY.

Works only in the entry is a YouTube video.

If ARG is non-nil, re-fetch the subtitles regardless of whether
they were fetched before."
  (interactive (list elfeed-show-entry current-prefix-arg))
  (let ((video-id (cadr
                   (assoc "watch?v"
                          (url-parse-query-string
                           (substring
                            (url-filename
                             (url-generic-parse-url (elfeed-entry-link entry)))
                            1))))))
    (unless video-id
      (user-error "Can't get video ID from the entry"))
    (my/youtube-subtitles-get
     video-id
     (lambda (file-name)
       (with-current-buffer (find-file-other-window file-name)
         (setq-local elfeed-show-entry entry)
         (goto-char (point-min))))
     :file-name (concat my/elfeed-srt-dir
                        (elfeed-ref-id (elfeed-entry-content entry))
                        ".vtt")
     :overwrite arg)))
#+end_src

That opens up a =.vtt= buffer with the subtitles for the current video, which means now we can use the functionality of Sacha Chua's awesome package called [[https://github.com/sachac/subed][subed]].

This package, besides syntax highlighting, allows for controlling the MPV playback, for instance by moving the cursor in the subtitles buffer. Using that requires having the URL of the video in this buffer, which necessitates the line with =setq-local= in the previous function.

Also, the package launches its own instance of MPV to control it via JSON-IPC, so there seems to be no easy way to integrate it with EMMS. But at least I can reuse the =emms-player-mpv-parameters= variable, the method of setting which I've discussed above. The function is as follows:
#+begin_src emacs-lisp
(defun my/subed-elfeed (entry)
  "Open the video file from elfeed ENTRY in MPV.

This has to be launched from inside the subtitles buffer, opened
by the `my/elfeed-youtube-subtitles' function."
  (interactive (list elfeed-show-entry))
  (unless entry
    (user-error "No entry!"))
  (unless (derived-mode-p 'subed-mode)
    (user-error "Not subed mode!"))
  (setq-local subed-mpv-arguments
              (seq-uniq
               (append subed-mpv-arguments emms-player-mpv-parameters)))
  (setq-local subed-mpv-video-file (elfeed-entry-link entry))
  (subed-mpv--play subed-mpv-video-file))
#+end_src

Keep in mind that this function has to be launched inside the buffer opened by the =my/elfeed-youtube-subtitles= function.
*** Podcast transcripts
In my experience, finding something in a podcast can be particularly troublesome. For instance, at times, I want to refer to a specific line in the podcast to make an [[https://github.com/org-roam/org-roam][org-roam]] node, and I need to check if I got that part right. And I have no reasonable way to get there because audio files, in themselves, don't allow for [[https://en.wikipedia.org/wiki/Random_access][random access]], i.e. there are no "landmarks" that point to a particular portion of the file. At least if nothing like a transcript is available.

For obvious reasons, podcasts rarely ship with transcripts. So in this +post+ section I'll be using a speech recognition engine to make up for that. The general idea is to obtain the podcast information from [[https://github.com/skeeto/elfeed][elfeed]], process it with [[https://github.com/openai/whisper][OpenAI Whisper]] and feed it to [[https://github.com/sachac/subed][subed]] to control the playback in [[https://mpv.io/][MPV]].

Edit <2022-10-08 Sat>: Changed [[https://github.com/alphacep/vosk-api][vosk-api]] to OpenAI Whisper.

**** Whisper
[[https://github.com/openai/whisper][OpenAI Whisper]] is an amazing speech recognition toolkit.

The implementation by OpenAI is rather slow on my PC (speed around 0.75 on tiny.en), but [[https://github.com/ggerganov/whisper.cpp][whisper.cpp]] by Georgi Gerganov works much faster (5.9x). I've packaged the latter for Guix.

| Guix dependency |
|-----------------|
| whisper-cpp     |

**** Running it from Emacs
Running the program from Emacs is rather straightforward with [[https://www.gnu.org/software/emacs/manual/html_node/elisp/Asynchronous-Processes.html][asyncronous processes]].

I'm using an English-language-only model because that's the only language I need at the moment.

#+begin_src emacs-lisp
(defun my/invoke-whisper--direct (input output-dir remove-wav)
  "Extract subtitles from a WAV audio file.

INPUT is the absolute path to audio file, OUTPUT-DIR is the path to
the directory with resulting files."
  (let* ((default-directory output-dir)
         (buffer (generate-new-buffer "whisper"))
         (proc (start-process
                "whisper" buffer
                "whisper-cpp" "--model" "/home/pavel/.whisper/ggml-tiny.en.bin"
                "-otxt" "-ovtt" "-osrt" input)))
    (set-process-sentinel
     proc
     (lambda (process _msg)
       (let ((status (process-status process))
             (code (process-exit-status process)))
         (cond ((and (eq status 'exit) (= code 0))
                (notifications-notify :body "Audio conversion completed"
                                      :title "Whisper")
                (when remove-wav
                  (delete-file input))
                (dolist (extension '(".txt" ".vtt" ".srt"))
                  (rename-file (concat input extension)
                               (concat (file-name-sans-extension input) extension)))
                (kill-buffer (process-buffer process)))
               ((or (and (eq status 'exit) (> code 0))
                    (eq status 'signal))
                (let ((err (with-current-buffer (process-buffer process)
                             (buffer-string))))
                  (user-error "Error in Whisper: %s" err)))))))))

(defun my/invoke-whisper (input output-dir)
  "Extract subtitles from the audio file.

INPUT is the absolute path to the audio file, OUTPUT-DIR is the path
to the directory with resulting files.

Run ffmpeg if the file is not WAV."
  (interactive
   (list
    (read-file-name "Input file: " nil nil t)
    (read-directory-name "Output directory: ")))
  (if (string-match-p (rx ".wav" eos) input)
      (my/invoke-whisper--direct input output-dir)
    (let* ((ffmpeg-proc
            (start-process
             "ffmpef" nil "ffmpeg" "-i" input "-ar" "16000" "-ac" "1" "-c:a"
             "pcm_s16le" (concat (file-name-sans-extension input) ".wav"))))
      (set-process-sentinel
       ffmpeg-proc
       (lambda (process _msg)
         (let ((status (process-status process))
               (code (process-exit-status process)))
           (cond ((and (eq status 'exit) (= code 0))
                  (my/invoke-whisper--direct
                   (concat (file-name-sans-extension input) ".wav") output-dir t))
                 ((or (and (eq status 'exit) (> code 0))
                      (eq status 'signal))
                  (let ((err (with-current-buffer (process-buffer process)
                               (buffer-string))))
                    (user-error "Error in running ffmpeg: %s" err))))))))))
#+end_src

If run interactively, the defined function prompts for paths to both files.

The process sentinel sends a [[https://www.gnu.org/software/emacs/manual/html_node/elisp/Desktop-Notifications.html][desktop notification]] because it's a bit more noticeable than =message=, and the process is expected to take some time.

**** Integrating with elfeed
To actually run the function from the section above, we need to download the file in question.

The =whisper= executable, given the file =<file>.<extension>=, creates files named =<file>.vtt=, =<file>.srt=, =<file>.txt=. So first we need to save the file under the correct name.

I use a library called [[https://github.com/tkf/emacs-request][request.el]] to download files elsewhere, so I'll re-use it here. You can just as well invoke =curl= or =wget= via a asynchronous process.

This function downloads the file to a non-temporary folder, which is =~/.elfeed/podcast-files/= if you didn't move the elfeed database. That is so because a permanently downloaded file works better for the next section.

#+begin_src emacs-lisp
(with-eval-after-load 'elfeed
  (defvar my/elfeed-whisper-podcast-files-directory
    (concat elfeed-db-directory "/podcast-files/")))

(defun my/elfeed-whisper-get-transcript-new (entry)
  (interactive (list elfeed-show-entry))
  (let* ((url (caar (elfeed-entry-enclosures entry)))
         (file-name (concat
                     (elfeed-ref-id (elfeed-entry-content entry))
                     "."
                     (file-name-extension url)))
         (file-path (expand-file-name
                     (concat
                      my/elfeed-whisper-podcast-files-directory
                      file-name))))
    (message "Download started")
    (unless (file-exists-p my/elfeed-whisper-podcast-files-directory)
      (mkdir my/elfeed-whisper-podcast-files-directory))
    (request url
      :type "GET"
      :encoding 'binary
      :complete
      (cl-function
       (lambda (&key data &allow-other-keys)
         (let ((coding-system-for-write 'binary)
               (write-region-annotate-functions nil)
               (write-region-post-annotation-function nil))
           (write-region data nil file-path nil :silent))
         (message "Conversion started")
         (my/invoke-whisper file-path my/elfeed-srt-dir)))
      :error
      (cl-function
       (lambda (&key error-thrown &allow-other-keys)
         (message "Error!: %S" error-thrown))))))
#+end_src

I also experimented with a bunch of options to write binary data in Emacs, of which the way with =write-region= (as implemented in [[https://github.com/rejeep/f.el][f.el]]) seems to be the fastest. [[https://emacs.stackexchange.com/questions/59449/how-do-i-save-raw-bytes-into-a-file][This thread on StackExchange]] suggests that it may screw some bytes towards the end, but whether or not this is the case, mp3 files survive the procedure. The proposed solution with =seq-doseq= takes at least a few seconds.

As =my/invoke-whisper= creates multiple files, here's a function to select related files:
#+begin_src emacs-lisp
(defun my/elfeed-show-related-files (entry)
  (interactive (list elfeed-show-entry))
  (let* ((files
          (mapcar
           (lambda (file) (cons (file-name-extension file) file))
           (seq-filter
            (lambda (file)
              (string-match-p
               (rx bos (literal (elfeed-ref-id (elfeed-entry-content entry))) ".")
               file))
            (directory-files my/elfeed-srt-dir))))
         (buffer
          (find-file-other-window
           (concat
            my/elfeed-srt-dir
            (alist-get
             (completing-read "File: " files)
             files nil nil #'equal)))))
    (with-current-buffer buffer
      (setq-local elfeed-show-entry entry))))
#+end_src

Finally, we need a function to show the transcript if it exists or invoke =my/elfeed-whisper-get-transcript-new= if it doesn't. And this is the function that we'll call from an =elfeed-entry= buffer.

#+begin_src emacs-lisp
(defun my/elfeed-whisper-get-transcript (entry)
  "Retrieve transcript for the enclosure of the current elfeed ENTRY."
  (interactive (list elfeed-show-entry))
  (let ((enclosure (caar (elfeed-entry-enclosures entry))))
    (unless enclosure
      (user-error "No enclosure found!"))
    (let ((srt-path (concat my/elfeed-srt-dir
                            (elfeed-ref-id (elfeed-entry-content entry))
                            ".srt")))
      (if (file-exists-p srt-path)
          (let ((buffer (find-file-other-window srt-path)))
            (with-current-buffer buffer
              (setq-local elfeed-show-entry entry)))
        (my/elfeed-whisper-get-transcript-new entry)))))
#+end_src

**** Integrating with subed
Now that we've produced a =.srt= file, we can use a package called [[https://github.com/sachac/subed][subed]] to control the playback, as I had done in the previous post.

By the way, this wasn't the most straightforward thing to figure out, because the MPV window doesn't show up for an audio file, and the player itself starts in the paused state. So I thought nothing was happening until I enabled the debug log.

With that in mind, here's a function to launch MPV from the buffer generated by =my/elfeed-whisper-get-transcript=:
#+begin_src emacs-lisp
(defun my/elfeed-whisper-subed (entry)
  "Run MPV for the current Whisper-generated subtitles file.

ENTRY is an instance of `elfeed-entry'."
  (interactive (list elfeed-show-entry))
  (unless entry
    (user-error "No entry!"))
  (unless (derived-mode-p 'subed-mode)
    (user-error "Not subed mode!"))
  (setq-local subed-mpv-video-file
              (expand-file-name
               (concat my/elfeed-whisper-podcast-files-directory
                       (my/get-file-name-from-url
                        (caar (elfeed-entry-enclosures entry))))))
  (subed-mpv--play subed-mpv-video-file))
#+end_src

After running =M-x my/elfeed-whisper-subed=, run =M-x subed-toggle-loop-over-current-subtitle= (=C-c C-l=), because somehow it's turned on by default, and =M-x subed-toggle-pause-while-typing= (=C-c C-p=), because sometimes this made my instance of MPV lag.

After that, =M-x subed-mpv-toggle-pause= should start the playback, which you can control by moving the cursor in the buffer.

You can also run =M-x subed-toggle-sync-point-to-player= (=C-c .=) to toggle syncing the point in the buffer to the currently played subtitle (this automatically gets disabled when you switch buffers).

Running =M-x subed-toggle-sync-player-to-point= (=C-c ,=) does the opposite, i.e. sets the player position to the subtitle under point. These two functions are useful since the MPV window controls aren't available.

**** Running it for random files
Apparently I also need to run whisper for random files from the Internet.

#+begin_src emacs-lisp
(defun my/whisper-url (url file-name output-dir)
  (interactive
   (list (read-from-minibuffer "URL: ")
         (read-from-minibuffer "File name: ")
         (read-directory-name "Output directory: ")))
  (let ((file-path
         (concat output-dir file-name "." (file-name-extension url))))
    (message "Download started")
    (request url
      :type "GET"
      :encoding 'binary
      :complete
      (cl-function
       (lambda (&key data &allow-other-keys)
         (let ((coding-system-for-write 'binary)
               (write-region-annotate-functions nil)
               (write-region-post-annotation-function nil))
           (write-region data nil file-path nil :silent))
         (message "Conversion started")
         (my/invoke-whisper file-path output-dir)))
      :error
      (cl-function
       (lambda (&key error-thrown &allow-other-keys)
         (message "Error!: %S" error-thrown))))))
#+end_src
**** Some observations
So, the functions above work for my purposes.

Vosk API works much faster than Whisper. The smallest Vosk model requires ~10 times less than the playback time, and even the =tiny.en= Whisper model on my PC requires maybe 1.2x playback time.

However, the quality of the output for Whisper is just so much better so I consider it to be worth the wait. Even with the =tiny= model, the transcript is almost perfect, provided that the audio is of reasonable quality.
** Internet & Multimedia
*** Notmuch
My notmuch config now resides in [[file:Mail.org][Mail.org]].

#+begin_src emacs-lisp
(unless (or my/is-termux my/remote-server)
  (let ((mail-file (expand-file-name "mail.el" user-emacs-directory)))
    (if (file-exists-p mail-file)
        (load-file mail-file)
      (message "Can't load mail.el"))))
#+end_src
*** Gnus
[[https://www.gnu.org/software/emacs/manual/html_node/gnus/index.html][Gnus]] is an Emacs newsreader.

I'll try to use it for NTTP for now. Will see if I can do more with it.

#+begin_src emacs-lisp
(use-package gnus
  :straight t
  :init
  (my-leader-def "au" #'gnus)
  :config
  (my/persp-add-rule
    gnus-summary-mode 0 "gnus"
    ;; gnus-article-edit-mode 0 "gnus"
    gnus-browse-mode 0 "gnus"
    gnus-server-mode 0 "gnus"
    gnus-article-mode 0 "gnus"
    gnus-group-mode 0 "gnus"
    gnus-category-mode 0 "gnus")
  (let ((gnus-directory (concat user-emacs-directory "gnus")))
    (unless (file-directory-p gnus-directory)
      (make-directory gnus-directory))
    (setq gnus-dribble-directory (concat gnus-directory "/dribble"))
    (setq gnus-init-file (concat gnus-directory "/gnus.el"))
    (setq gnus-startup-file (concat gnus-directory "/newsrc")))
  ;; Sources
  (setq gnus-select-method '(nntp "news.gwene.org"))
  ;; Dribble
  (setq gnus-always-read-dribble-file t)
  ;; Agent
  (setq gnus-agent-article-alist-save-format 1)
  (setq gnus-agent-cache t))
#+end_src

**** Groups
Toggle current topic.

#+begin_src emacs-lisp
(defun my/gnus-topic-toggle-topic ()
  (interactive "" gnus-topic-mode)
  (when (gnus-group-topic-p)
    (let ((topic (gnus-topic-find-topology (gnus-current-topic))))
      (if (eq (cadadr topic) 'visible)
          (progn
            (gnus-topic-goto-topic (gnus-current-topic))
            (gnus-topic-remove-topic nil nil))
        (gnus-topic-remove-topic t nil)))))
#+end_src

Custom keybindings.
#+begin_src emacs-lisp
(with-eval-after-load 'gnus-group
  ;; Group
  (add-hook 'gnus-group-mode-hook #'gnus-topic-mode)
  (general-define-key
   :states '(normal)
   :keymaps '(gnus-group-mode-map)
   "a" #'gnus-group-toggle-subscription-at-point)
  (general-define-key
   :states '(normal)
   :keymaps '(gnus-topic-mode-map)
   "TAB" #'my/gnus-topic-toggle-topic
   "r" #'gnus-topic-catchup-articles))
#+end_src
**** Summary
#+begin_src emacs-lisp
(with-eval-after-load 'gnus-summary
  (setq gnus-summary-line-format "%U%R%z%I%(%[%4L: %-23,23f%]%) %s\n")
  (setq gnus-sum-thread-tree-false-root "> ")
  (setq gnus-sum-thread-tree-indent "  ")
  (setq gnus-sum-thread-tree-single-indent " ")
  (setq gnus-sum-thread-tree-leaf-with-other "+-> ")
  (setq gnus-sum-thread-tree-root "> ")
  (setq gnus-sum-thread-tree-single-leaf "\\-> ")
  (setq gnus-sum-thread-tree-vertical "| "))
#+end_src
*** EMMS
EMMS is the Emacs Multi-Media System. I use it to control MPD & MPV.

References:
- [[https://www.gnu.org/software/emms/manual/][EMMS Manual]]
- [[https://www.youtube.com/watch?v=xTVN8UDScqk][Uncle Dave's video]]

#+begin_src emacs-lisp :noweb yes
(use-package emms
  :straight t
  :if (not (or my/remote-server my/is-termux))
  :commands (emms-smart-browse
             emms-browser
             emms-add-url
             emms-add-file
             emms-add-find)
  :init
  (my-leader-def
    :infix "as"
    "" '(:which-key "emms")
    "s" (my/command-in-persp "EMMS" "EMMS" 0 (emms-smart-browse))
    "b" #'emms-browser
    "p" #'emms-pause
    "q" #'emms-stop
    ;; "h" #'emms-previous
    ;; "l" #'emms-next
    "u" #'emms-player-mpd-connect
    "ww" #'emms-lyrics
    "wb" #'emms-lyrics-toggle-display-on-minibuffer
    "wm" #'emms-lyrics-toggle-display-on-modeline
    "k" #'emms-volume-raise
    "j" #'emms-volume-lower)
  (my/persp-add-rule
    emms-browser-mode 0 "EMMS"
    emms-playlist-mode 0 "EMMS")
  (setq emms-mode-line-icon-enabled-p nil)
  :config
  (require 'emms-setup)
  (require 'emms-player-mpd)
  (require 'emms-player-mpv)
  (emms-all)
  ;; MPD setup
  <<emms-mpd-setup>>
  ;; MPV setup
  <<emms-mpv-setup>>
  ;; evil-lion and evil-commentary shadow some gX bindings
  ;; (add-hook 'emms-browser-mode-hook
  ;; (lambda ()
  ;; (evil-lion-mode -1)
  ;; (evil-commentary-mode -1)
  ;; ))
  ;; <I've just read the line below as "I hate everything">
  ;; I have everything I need in polybar
  (emms-mode-line-mode -1)
  (emms-playing-time-display-mode -1)
  <<emms-fixes>>)
#+end_src
**** MPD
:PROPERTIES:
:header-args:emacs-lisp: :tangle no :noweb-ref emms-mpd-setup
:END:
[[https://www.musicpd.org/][mpd]] is a server for playing music. It has a couple of first-class clients, including curses-based [[https://github.com/ncmpcpp/ncmpcpp][ncmpcpp]], but of course, I want to use Emacs.

#+begin_src emacs-lisp
(setq emms-source-file-default-directory (expand-file-name "~/Music/"))
(add-to-list 'emms-info-functions 'emms-info-mpd)
(add-to-list 'emms-player-list 'emms-player-mpd)
(setq emms-player-mpd-server-name "localhost")
(setq emms-player-mpd-server-port "6600")
(setq emms-player-mpd-music-directory "~/Music")
#+end_src

Connect on setup. For some reason, it stops the mpd playback whenever it connects, but it is not a big issue.
#+begin_src emacs-lisp
(emms-player-mpd-connect)
#+end_src

Clear MPD playlist on clearing EMMS playlist. IDK if this is fine for MPD library playlist, I don't use them anyhow.
#+begin_src emacs-lisp
(add-hook 'emms-playlist-cleared-hook 'emms-player-mpd-clear)
#+end_src

Set a custom regex for MPD. EMMS sets up the default one from MPD's diagnostic output so that regex opens basically everything, including videos, https links, etc. That is fine if MPD is the only player in EMMS, but as I want to use MPV as well, I override the regex.
#+begin_src emacs-lisp
(emms-player-set emms-player-mpd
                 'regex
                 (rx (or (: "https://" (* nonl) (or "acast.com") (* nonl))
                         (+ (? (or "https://" "http://"))
                            (* nonl)
                            (regexp (eval (emms-player-simple-regexp
                                           "m3u" "ogg" "flac" "mp3" "wav" "mod" "au" "aiff" "m4a")))))))
#+end_src

After all this is done, run =M-x emms-cache-set-from-mpd-all= to set cache from MPD. If everything is correct, EMMS browser will be populated with MPD database.
**** MPV
:PROPERTIES:
:header-args:emacs-lisp: :tangle no :noweb-ref emms-mpv-setup
:END:
| Guix dependency |
|-----------------|
| mpv             |
| yt-dlp          |

[[https://mpv.io/][mpv]] is a decent media player, which has found a place in this configuration because it integrates with +youtube-dl+ yt-dlp.

It looks like YouTube has started to throttle youtube-dl, and yt-dlp has a workaround for that particular case. Just don't forget to add the following like to the mpv config:
#+begin_src conf-unix :tangle ~/.config/mpv/mpv.conf
script-opts=ytdl_hook-ytdl_path=yt-dlp
#+end_src

It seems a bit strange to keep the MPV config in this file, but I don't use the program outside Emacs.

#+begin_src emacs-lisp
(add-to-list 'emms-player-list 'emms-player-mpv t)
#+end_src

Also a custom regex. My demands for MPV include running =yt-dlp=, so there is a regex that matches youtube.com or some of the video formats.
#+begin_src emacs-lisp
(emms-player-set emms-player-mpv
                 'regex
                 (rx (or (: "https://" (* nonl) "youtube.com" (* nonl))
                         (+ (? (or "https://" "http://"))
                            (* nonl)
                            (regexp (eval (emms-player-simple-regexp
                            "mp4" "mov" "wmv" "webm" "flv" "avi" "mkv")))))))
#+end_src

By default, MPV plays the video in the best possible quality, which may be pretty high, even too high with limited bandwidth. So here is the logic to choose the quality.
#+begin_src emacs-lisp
(setq my/youtube-dl-quality-list
      '("bestvideo[height<=720]+bestaudio/best[height<=720]"
        "bestvideo[height<=480]+bestaudio/best[height<=480]"
        "bestvideo[height<=1080]+bestaudio/best[height<=1080]"))

(setq my/default-emms-player-mpv-parameters
      '("--quiet" "--really-quiet" "--no-audio-display"))

(defun my/set-emms-mpd-youtube-quality (quality)
  (interactive "P")
  (unless quality
    (setq quality (completing-read "Quality: " my/youtube-dl-quality-list nil t)))
  (setq emms-player-mpv-parameters
        `(,@my/default-emms-player-mpv-parameters ,(format "--ytdl-format=%s" quality))))

(my/set-emms-mpd-youtube-quality (car my/youtube-dl-quality-list))
#+end_src

Now =emms-add-url= should work on YouTube URLs just fine. Just keep in mind that it will only add the URL to the playlist, not play it right away.
**** Cache cleanup
All the added URLs reside in the EMMS cache after being played. I don't want them to stay there for a long time, so here is a handy function to clean it.

#+begin_src emacs-lisp
(defun my/emms-cleanup-urls ()
  (interactive)
  (let ((keys-to-delete '()))
    (maphash (lambda (key value)
               (when (eq (cdr (assoc 'type value)) 'url)
                 (add-to-list 'keys-to-delete key)))
             emms-cache-db)
    (dolist (key keys-to-delete)
      (remhash key emms-cache-db)))
  (setq emms-cache-dirty t))

(my-leader-def "asc" #'my/emms-cleanup-urls)
#+end_src
**** Fetching lyrics
My package for fetching EMMS lyrics and album covers.

#+begin_src emacs-lisp
(use-package lyrics-fetcher
  :straight t
  :after (emms)
  :init
  (my-leader-def
    "ast" #'lyrics-fetcher-show-lyrics
    "asT" #'lyrics-fetcher-show-lyrics-query)
  :config
  (setq lyrics-fetcher-genius-access-token
        (my/password-store-get "My_Online/APIs/genius.com"))
  (general-define-key
   :states '(emacs normal)
   :keymaps 'emms-browser-mode-map
   "gr" #'emms-browse-by-artist
   "gl" 'lyrics-fetcher-emms-browser-show-at-point
   "gC" 'lyrics-fetcher-emms-browser-fetch-covers-at-point
   "go" 'lyrics-fetcher-emms-browser-open-large-cover-at-point)

  (advice-add #'emms-lyrics-mode-line
              :override #'my/emms-lyrics-mode-line-override))
#+end_src

Also advice to change the location of the lyrics in the mode line.
#+begin_src emacs-lisp
(defun my/emms-lyrics-mode-line-override ()
  (add-to-list 'global-mode-string
               '(:eval emms-lyrics-mode-line-string)))

(defun my/emms-lyrics-restore-mode-line-override ()
  "Restore the mode line."
  (setq global-mode-string
	    (remove '(:eval emms-lyrics-mode-line-string) global-mode-string))
  (force-mode-line-update))

(with-eval-after-load 'emms-lyrics
  (advice-add #'emms-lyrics-mode-line
              :override #'my/emms-lyrics-mode-line-override)
  (advice-add #'emms-lyrics-restore-mode-line
              :override #'my/emms-lyrics-restore-mode-line-override))
#+end_src
**** Some keybindings
#+begin_src emacs-lisp
(with-eval-after-load 'emms-browser
  (general-define-key
   :states '(normal)
   :keymaps 'emms-browser-mode-map
   "q" 'quit-window))

(with-eval-after-load 'emms
  (general-define-key
   :states '(normal)
   :keymaps 'emms-playlist-mode-map
   "q" 'quit-window))
#+end_src
**** Setting volume
#+begin_src emacs-lisp
(defun my/set-volume (value)
  (start-process "ponymix" nil "ponymix"
                 (if (< 0 value) "increase" "decrease")
                 (number-to-string (abs value))
                 "--max-volume" "150"))

(setq emms-volume-change-function #'my/set-volume)
(setq emms-volume-change-amount 5)
#+end_src
**** EMMS & mpd Fixes
+Some fixes until I submit a patch.+ I've submitted a patch for with these fixes, so I'll remove this section eventually.

For some reason EMMS doesn't fetch =albumartist= from MPD. Overriding this function fixes that.

#+begin_src emacs-lisp :tangle no :noweb-ref emms-fixes
(defun emms-info-mpd-process (track info)
  (dolist (data info)
    (let ((name (car data))
          (value (cdr data)))
      (setq name (cond ((string= name "artist") 'info-artist)
                       ((string= name "albumartist") 'info-albumartist)
                       ((string= name "composer") 'info-composer)
                       ((string= name "performer") 'info-performer)
                       ((string= name "title") 'info-title)
                       ((string= name "album") 'info-album)
                       ((string= name "track") 'info-tracknumber)
                       ((string= name "disc") 'info-discnumber)
                       ((string= name "date") 'info-year)
                       ((string= name "genre") 'info-genre)
                       ((string= name "time")
                        (setq value (string-to-number value))
                        'info-playing-time)
                       (t nil)))
      (when name
        (emms-track-set track name value)))))
#+end_src

Also, =emms-player-mpd-get-alists= has an interesting bug. This function parses the response to =listallinfo=, which looks something like this:
#+begin_example
tag1: value1
tag2: value2
...
tag1: value1'
tag2: value2'
#+end_example

This structure has to be converted to list of alists, which looks like:
#+begin_example
(("tag1" . "value1"
  "tag2" . "value2")
  ("tag1" . "value1'"
  ("tag2" . "value2'")))
#+end_example

The original implementation creates a new alist whenever it encounters a tag it has already put in the current alist. Which doesn't work too well if some tags don't repeat, if the order is messed up, etc.

Fortunately, according to the [[https://mpd.readthedocs.io/en/latest/protocol.html#command-lsinfo][protocol specification]], each new record has to start with =file=, =directory= or =playlist=. I've overridden the function with that in mind and it fixed the import, at least for my case.

#+begin_src emacs-lisp :tangle no :noweb-ref emms-fixes
(defun emms-player-mpd-get-alists (info)
  "Turn the given parsed INFO from MusicPD into an list of alists.

The list will be in reverse order."
  (when (and info
             (null (car info))          ; no error has occurred
             (cdr info))                ; data exists
    (let ((alists nil)
          (alist nil)
          cell)
      (dolist (line (cdr info))
        (when (setq cell (emms-player-mpd-parse-line line))
          (if (member (car cell) '("file" "directory" "playlist"))
              (setq alists (cons alist alists)
                    alist (list cell))
            (setq alist (cons cell alist)))))
      (when alist
        (setq alists (cons alist alists)))
      alists)))
#+end_src
*** ytel
[[https://github.com/gRastello/ytel][ytel]] is a YouTube (actually Invidious) frontend, which lets one search YouTube (whereas the setup with elfeed just lets one view the pre-defined subscriptions).

**** Package config
The package doesn't provide evil bindings, so I define my own.
#+begin_src emacs-lisp
(use-package ytel
  :straight t
  :commands (ytel)
  :config
  (setq ytel-invidious-api-url "https://invidio.xamh.de/")
  (general-define-key
   :states '(normal)
   :keymaps 'ytel-mode-map
   "q" #'ytel-quit
   "s" #'ytel-search
   "L" #'ytel-search-next-page
   "H" #'ytel-search-previous-page
   "RET" #'my/ytel-add-emms))
#+end_src

**** EMMS integration
And here is the same kind of integration with EMMS as in the elfeed setup:
#+begin_src emacs-lisp
(with-eval-after-load 'emms
  (define-emms-source ytel (video)
    (let ((track (emms-track
                  'url (concat "https://www.youtube.com/watch?v="
                               (ytel-video-id video)))))
      (emms-track-set track 'info-title (ytel-video-title video))
      (emms-track-set track 'info-artist (ytel-video-author video))
      (emms-playlist-insert-track track))))

(defun my/ytel-add-emms ()
  (interactive)
  (emms-add-ytel (ytel-get-current-video)))
#+end_src

**** Choosing instances
Invidious instances aren't particularly reliable, but there plenty of them, and there's an API at =invidious.io= that returns the available instances and their health, so we can use that.

Inspired by [[https://github.com/grastello/ytel/issues/17#issuecomment-801745429][this comment]].
#+begin_src emacs-lisp
(setq my/invidious-instances-url
      "https://api.invidious.io/instances.json?pretty=1&sort_by=health")
#+end_src

#+begin_src emacs-lisp
(defun my/ytel-instances-fetch-json ()
  "Fetch list of invidious instances as json, sorted by health."
  (let
      ((url-request-method "GET")
       (url-request-extra-headers
        '(("Accept" . "application/json"))))
    (with-current-buffer
        (url-retrieve-synchronously my/invidious-instances-url)
      (goto-char (point-min))
      (re-search-forward "^$")
      (let* ((json-object-type 'alist)
             (json-array-type 'list)
             (json-key-type 'string))
        (json-read)))))

(defun my/ytel-instances-alist-from-json ()
  "Make the json of invidious instances into an alist."
  (let ((jsonlist (my/ytel-instances-fetch-json))
        (inst ()))
    (while jsonlist
      (push (concat "https://" (caar jsonlist)) inst)
      (setq jsonlist (cdr jsonlist)))
    (nreverse inst)))

(defun my/ytel-choose-instance ()
  "Prompt user to choose an invidious instance to use."
  (interactive)
  (setq ytel-invidious-api-url
        (or (condition-case nil
                (completing-read "Using instance: "
                                 (cl-subseq (my/ytel-instances-alist-from-json) 0 11) nil "confirm" "https://")
              (error nil))
            "https://invidious.synopyta.org")))
#+end_src

**** Some fixes
At some point in the last 2 years, Invidious started to return videos with =null= fields. I have no idea what causes that, but I suspect it's related to YouTube Music.

=ytel= hasn't been updated in these two years, so it doesn't account for that change.

So, let's skip videos with null titles.
#+begin_src emacs-lisp
(defun my/ytel-draw--buffer-nil-videos-fix ()
  (let ((inhibit-read-only t)
	    (current-line      (line-number-at-pos)))
    (erase-buffer)
    (setf header-line-format
          (concat "Search results for "
				  (propertize ytel-search-term 'face 'ytel-video-published-face)
				  ", page "
				  (number-to-string ytel-current-page)))
    (seq-do
     (lambda (v)
	   (ytel--insert-video v)
	   (insert "\n"))
     (seq-filter
      (lambda (v)
        (ytel-video-title v))
      ytel-videos))
    (goto-char (point-min))))

(with-eval-after-load 'ytel
  (advice-add #'ytel--draw-buffer :override #'my/ytel-draw--buffer-nil-videos-fix))
#+end_src

And render other potentially =null= fields as "unknown".
#+begin_src emacs-lisp
(defun my/ytel--format-unknown-fix (fun &rest args)
  (if (car args)
      (apply fun args)
    "unknown   "))

(with-eval-after-load 'ytel
  (advice-add #'ytel--format-video-length :around #'my/ytel--format-unknown-fix)
  (advice-add #'ytel--format-video-published :around #'my/ytel--format-unknown-fix)
  (advice-add #'ytel--format-video-views :around #'my/ytel--format-unknown-fix))
#+end_src
**** Some functions
Also, a function to copy a URL to the video under cursor.
#+begin_src emacs-lisp
(defun my/ytel-kill-url ()
  (interactive)
  (kill-new
   (concat
    "https://www.youtube.com/watch?v="
    (ytel-video-id (ytel-get-current-video)))))
#+end_src

*** EWW
Emacs built-in web browser. +I wonder if anyone actually uses it.+

I use it occasionally to open links in elfeed.

Toggle using fonts in buffer:
#+begin_src emacs-lisp
(defun my/toggle-shr-use-fonts ()
  "Toggle the shr-use-fonts variable in buffer"
  (interactive)
  (setq-local shr-use-fonts (not shr-use-fonts)))
#+end_src

Setting the default font.
#+begin_src emacs-lisp
(defface my/shr-face
  `((t :inherit variable-pitch))
  "Default face for shr rendering.")

(my/use-colors
  (my/shr-face :foreground (my/color-value 'blue)))

(defun my/shr-insert-around (fun &rest args)
  (let ((shr-current-font (or shr-current-font 'my/shr-face)))
    (apply fun args)))

(defun my/shr-urlify-around (fun start url &optional title)
  (funcall fun start url title)
  (let ((faces (get-text-property start 'face)))
    (put-text-property
     start (point)
     'face
     (mapcar
      (lambda (face)
        (if (eq face 'my/shr-face)
            'link
          face))
      (if (sequencep faces) faces (list faces))))))

(with-eval-after-load 'shr
  (advice-add #'shr-insert :around #'my/shr-insert-around)
  (advice-add #'shr-urlify :around #'my/shr-urlify-around))
#+end_src

#+begin_src emacs-lisp
(my-leader-def "aw" 'eww)
(my/persp-add-rule
  eww-mode 2 "browser")

(with-eval-after-load 'eww
  (general-define-key
   :keymaps '(eww-mode-map)
   :states '(normal emacs)
   "f" #'ace-link-eww
   "+" 'text-scale-increase
   "-" 'text-scale-decrease))
#+end_src
*** ERC
ERC is a built-it Emacs IRC client.

#+begin_src emacs-lisp
(use-package erc
  :commands (erc erc-tls)
  :straight (:type built-in)
  :config
  (setq erc-log-channels-directory "~/.erc/logs")
  (setq erc-save-buffer-on-part t)
  (add-to-list 'erc-modules 'autojoin)
  (add-to-list 'erc-modules 'notifications)
  (add-to-list 'erc-modules 'log)
  (erc-update-modules)
  (setq erc-autojoin-channels-alist
        `((,(rx "libera.chat")
           "#systemcrafters" "#systemcrafters-emacs")))
  (setq erc-kill-buffer-on-part t)
  (setq erc-track-shorten-start 8))
#+end_src

Exclude everything but actual messages from notifications.
#+begin_src emacs-lisp
(setq erc-track-exclude-types '("NICK" "JOIN" "LEAVE" "QUIT" "PART"
                                "301"   ; away notice
                                "305"   ; return from awayness
                                "306"   ; set awayness
                                "324"   ; modes
                                "329"   ; channel creation date
                                "332"   ; topic notice
                                "333"   ; who set the topic
                                "353"   ; Names notice
                                ))
#+end_src

A plugin to highlight IRC nicknames:
#+begin_src emacs-lisp
(use-package erc-hl-nicks
  :hook (erc-mode . erc-hl-nicks-mode)
  :after (erc)
  :straight t)
#+end_src

ZNC support. Seems to provide a few nice features for ZNC.
#+begin_src emacs-lisp
(use-package znc
  :straight t
  :commands (znc-erc)
  :init
  ;; (my-leader-def "ai" #'znc-erc)
  (my/persp-add-rule
    erc-mode 3 "ERC")
  :config
  (setq znc-servers
        `(("sqrtminusone.xyz" 6697 t
           ((libera "sqrtminusone"
                    ,(my/password-store-get "Selfhosted/ZNC")))))))
#+end_src

Send =/detach= to all servers. Kinda strange that there's no such function already
#+begin_src emacs-lisp
(defun my/erc-detach-all ()
  (interactive)
  (cl-loop for buf being the buffers
           if (eq (buffer-local-value 'major-mode buf) 'erc-mode)
           do (with-current-buffer buf
                (when (erc-server-process-alive)
                  (let ((tgt (erc-default-target)))
                    (erc-server-send (format "DETACH %s" tgt) nil tgt))))))

#+end_src
*** Mastodon
Mastodon is a decentralized social media network. I use an instance called [[https://emacs.ch/][emacs.ch]].

**** Package configuration
[[https://codeberg.org/martianh/mastodon.el][mastodon.el]] is an Emacs client for Mastodon.

The default UI is rather rough, but Nicolas Rougier's [[https://github.com/rougier/mastodon-alt][mastodon-alt]] package makes things a bit more how I would like to see them.

#+begin_src emacs-lisp
(use-package mastodon
  :straight t
  :commands (my/mastodon)
  :init
  (my-leader-def "an" #'my/mastodon)
  :config
  (setq mastodon-instance-url "https://emacs.ch")
  (setq mastodon-active-user "sqrtminusone")
  (my/persp-add-rule mastodon-mode 0 "mastodon")
  ;; Hide spoilers by default
  (setq-default mastodon-toot--content-warning t)
  (setq mastodon-media--avatar-height 40)
  (setq mastodon-tl--show-avatars t)
  ;; The default emojis take two characters for me
  (setq mastodon-tl--symbols
        '((reply "" . "R")
          (boost "" . "B")
          (favourite "" . "F")
          (bookmark "" . "K")
          (media "" . "[media]")
          (verified "" . "V")
          (locked "" . "[locked]")
          (private "" . "[followers]")
          (direct "" . "[direct]")
          (edited "" . "[edited]"))))

(use-package mastodon-alt
  :straight (:host github :repo "rougier/mastodon-alt")
  :after (mastodon)
  :config
  (mastodon-alt-tl-activate))

(use-package transient
  :straight t
  :defer t)
#+end_src
**** UI and keymaps
=display-line-numbers-mode= screws the UI for some reason.

#+begin_src emacs-lisp
(defun my/mastodon-configure ()
  (display-line-numbers-mode -1))

(add-hook 'mastodon-mode-hook #'my/mastodon-configure)
#+end_src

Kill processes. Useful when the package stops working due to unstable connection.

#+begin_src emacs-lisp
(defun my/mastodon-reset ()
  (interactive)
  (cl-loop for process in (process-list)
           if (string-match-p "emacs.ch" (process-name process))
           do (delete-process process)))
#+end_src

The package also doesn't have evil bindings. I implement a few basic bindings here:
#+begin_src emacs-lisp
(with-eval-after-load 'mastodon
  (general-define-key
   :states '(normal motion)
   :keymaps '(mastodon-mode-map)
   "J" #'mastodon-tl--goto-next-toot
   "K" #'mastodon-tl--goto-prev-toot
   "M-j" #'mastodon-tl--next-tab-item
   "M-k" #'mastodon-tl--prev-tab-item
   "<tab>" #'mastodon-tl--next-tab-item
   "<backtab>" #'mastodon-tl--previous-tab-item
   "o" #'my/mastodon-toot
   "r" 'mastodon-tl--update
   "c" #'mastodon-tl--toggle-spoiler-text-in-toot
   "q" #'kill-current-buffer))
#+end_src
**** Modeline segment
This is my attempt to make a modeline indicator for new mastodon notifications.

Edit [2023-07-28 Fri]: I'll probably remove that, don't feel like it's actually useful.

#+begin_src emacs-lisp
(defvar my/mastodon-mode-string "")

(defvar my/mastodon-mode-line-unread-ids nil)

(defvar my/mastodon-mode-line-saved-ids nil)

(defvar my/mastodon-mode-line-timer nil)

(defvar my/mastodon-mode-line-file
  (concat no-littering-var-directory "mastodon/notif-ids"))

(defun my/mastodon-mode-line-load-meta ()
  (when (file-exists-p my/mastodon-mode-line-file)
    (ignore-errors
      (with-temp-buffer
        (insert-file-contents my/mastodon-mode-line-file)
        (setq my/mastodon-mode-line-saved-ids
              (read (current-buffer)))))))

(defun my/mastodon-mode-line-persist-meta ()
  (mkdir (file-name-directory my/mastodon-mode-line-file) t)
  (let ((coding-system-for-write 'utf-8))
    (ignore-errors
      (with-temp-file my/mastodon-mode-line-file
        (let ((standard-output (current-buffer))
              (print-level nil)
              (print-length nil)
              (print-circle nil))
          (princ ";;; Mastodon Saved Notifications\n\n")
          (prin1 my/mastodon-mode-line-saved-ids))))))

(defun my/mastodon-mode-line-update ()
  (if my/mastodon-mode-line-unread-ids
      (setq my/mastodon-mode-string
            (concat "["
                    (propertize (number-to-string
                                 (length my/mastodon-mode-line-unread-ids))
                                'face 'success)
                    "]"))
    (setq my/mastodon-mode-string "")))

(defun my/mastodon-mode-line-update-fetch ()
  (mastodon-http--get-json-async
   (mastodon-http--api "notifications") nil
   (lambda (data)
     (let ((fetched-ids
            (cl-loop for datum in data collect (alist-get 'id datum))))
       (setq my/mastodon-mode-line-unread-ids
             (seq-difference fetched-ids my/mastodon-mode-line-saved-ids))
       (setq my/mastodon-mode-line-saved-ids
             (seq-intersection my/mastodon-mode-line-saved-ids fetched-ids)))
     (my/mastodon-mode-line-update))))

(defun my/mastodon-notifications--timeline-before (toots)
  (let* ((all-ids (seq-uniq
                   (append
                    my/mastodon-mode-line-saved-ids
                    (cl-loop for datum in toots
                             collect (alist-get 'id datum))))))
    (setq my/mastodon-mode-line-unread-ids
          (seq-difference my/mastodon-mode-line-unread-ids all-ids))
    (setq my/mastodon-mode-line-saved-ids all-ids))
  (my/mastodon-mode-line-update))

(with-eval-after-load 'mastodon
  (define-minor-mode my/mastodon-mode-line
    "Display mastodon notification count in mode line."
    :require 'mastodon
    :global t
    :group 'mastodon
    :after-hook
    (progn
      (when (timerp my/mastodon-mode-line-timer)
        (cancel-timer my/mastodon-mode-line-timer))
      (if my/mastodon-mode-line
          (progn
            (add-to-list 'mode-line-misc-info '(:eval my/mastodon-mode-string) t)
            (my/mastodon-mode-line-load-meta)
            (setq my/mastodon-mode-line-timer
                  (run-with-timer 0 150 #'my/mastodon-mode-line-update-fetch))
            (advice-add #'mastodon-notifications--timeline :before
                        #'my/mastodon-notifications--timeline-before)
            (add-hook 'kill-emacs-hook #'my/mastodon-mode-line-persist-meta))
        (setq mode-line-misc-info (delete '(:eval my/mastodon-mode-string)
                                          mode-line-misc-info))
        (advice-remove #'mastodon-notifications--timeline
                       #'my/mastodon-notifications--timeline-before)
        (remove-hook 'kill-emacs-hook #'my/mastodon-mode-line-persist-meta)
        (my/mastodon-mode-line-persist-meta)))))
#+end_src
**** Timeline Transient
The default =mastodon-tl--get-home-timeline= allows only to hide replies, and not boosted posts.

So here's a custom update function:
#+begin_src emacs-lisp
(defun my/mastodon-get-update-funciton (hide-replies hide-boosts)
  (lambda (toots)
    (let* ((is-profile (eq (mastodon-tl--get-buffer-type) 'profile-statuses))
           (hide-replies (and (not is-profile) hide-replies))
           (hide-boosts (and (not is-profile) hide-boosts))
           (toots (seq-filter
                   (lambda (toot)
                     (and
                      (or (not hide-replies)
                          ;; Why is the original function inverted??
                          (mastodon-tl--is-reply toot))
                      (or (not hide-boosts)
                          (not (alist-get 'reblog toot)))))
                   toots)))
      (mapc #'mastodon-tl--toot toots))))
#+end_src

In order to use it, the function has to be passed to =mastodon-tl--init=:
#+begin_src emacs-lisp
(defun my/mastodon-tl--get-home (hide-replies hide-boosts)
  (mastodon-tl--init
   "home"
   "timelines/home"
   (my/mastodon-get-update-funciton hide-replies hide-boosts)
   nil
   `(("limit" . ,mastodon-tl--timeline-posts-count))
   nil))
#+end_src

And a transient to use it.
#+begin_src emacs-lisp
(with-eval-after-load 'mastodon
  (require 'transient)
  (transient-define-prefix my/mastodon-tl ()
    ["Home timeline params"
     ("-r" "--hide-replies" "--hide-replies" :init-value
      (lambda (obj) (oset obj value "--hide-replies")))
     ("-b" "--hide-boosts" "--hide-boosts" :init-value
      (lambda (obj) (oset obj value "--hide-boosts")))]
    ["Timelines"
     :class transient-row
     ("t" "Home" (lambda (args)
                   (interactive (list (transient-args transient-current-command)))
                   (my/mastodon-tl--get-home
                    (seq-contains-p args "--hide-replies")
                    (seq-contains-p args "--hide-boosts"))))
     ("l" "Local" mastodon-tl--get-local-timeline)
     ("f" "Federated" mastodon-tl--get-federated-timeline)
     ("g" "One tag" mastodon-tl--get-tag-timeline)
     ("a" "Followed tags" mastodon-tl--followed-tags-timeline)
     ("s" "Some followed tags" mastodon-tl--some-followed-tags-timeline)]
    ["Misc"
     :class transient-row
     ("q" "Quit" transient-quit-one)]))
#+end_src
**** Main Transient
Also, there are so many commands that it's hard to remember all of them. So I define two transient prefixes.

The first dispatches "general" actions:

#+begin_src emacs-lisp
(with-eval-after-load 'mastodon
  (require 'transient)
  (transient-define-prefix my/mastodon ()
    "Mastodon."
    ["Various views"
     :class transient-row
     ("m" "Mastodon" mastodon)
     ("t" "Timelines" my/mastodon-tl)
     ("n" "Notifications" mastodon-notifications-get)
     ("s" "Search query" mastodon-search--search-query)]
    ["Tags"
     :class transient-row
     ("aa" "Followed tags" mastodon-tl--list-followed-tags)
     ("af" "Follow tag" mastodon-tl--follow-tag)
     ("aF" "Unfollow tag" mastodon-tl--unfollow-tag)]
    ["Own profile"
     :class transient-row
     ("c" "Toot" mastodon-toot)
     ("o" "My profile" mastodon-profile--my-profile)
     ("u" "Update profile note" mastodon-profile--update-user-profile-note)
     ("f" "Favourites" mastodon-profile--view-favourites)
     ("b" "Bookmarks" mastodon-profile--view-bookmarks)]
    ["Minor views"
     :class transient-row
     ("F" "Follow requests" mastodon-views--view-follow-requests)
     ("S" "Scheduled toots" mastodon-views--view-scheduled-toots)
     ("I" "Filters" mastodon-views--view-filters)
     ("G" "Follow suggestions" mastodon-views--view-follow-suggestions)
     ("L" "Lists" mastodon-views--view-lists)]
    ["Misc"
     :class transient-row
     ("/" "Switch to buffer" mastodon-switch-to-buffer)
     ("Q" "Kill all buffers" mastodon-kill-all-buffers)
     ("q" "Quit" transient-quit-one)]))
#+end_src
**** Toot Transient
And the second one dispatches actions related to particular toot / profile.

Also, some actions don't have any confirmations, so here's a macro that wraps a function with =y-or-n-p=:
#+begin_src emacs-lisp
(defmacro my/def-confirmer (func text)
  `(defun ,(intern (concat "my/" (symbol-name func) "-confirm")) ()
     (interactive)
     (when (y-or-n-p ,text)
       (call-interactively #',func))))
#+end_src

A function to open the toot in browser:
#+begin_src emacs-lisp
(defun my/mastodon-toot--browse ()
  "Copy URL of toot at point.
If the toot is a fave/boost notification, copy the URLof the
base toot."
  (interactive)
  (let* ((toot (or (mastodon-tl--property 'base-toot)
                   (mastodon-tl--property 'toot-json)))
         (url (if (mastodon-tl--field 'reblog toot)
                  (alist-get 'url (alist-get 'reblog toot))
                (alist-get 'url toot))))
    (browse-url url)))
#+end_src

And the prefix itself:
#+begin_src emacs-lisp
(with-eval-after-load 'mastodon
  (my/def-confirmer mastodon-toot--toggle-boost "Toggle boost for this post? ")
  (my/def-confirmer mastodon-toot--toggle-favourite "Toggle favourite this post? ")
  (my/def-confirmer mastodon-toot--toggle-bookmark "Toggle bookmark this post? ")
  (my/def-confirmer mastodon-tl--follow-user "Follow this user? ")
  (my/def-confirmer mastodon-tl--unfollow-user "Unfollow this user? ")
  (my/def-confirmer mastodon-tl--block-user "Block this user? ")
  (my/def-confirmer mastodon-tl--unblock-user "Unblock this user? ")
  (my/def-confirmer mastodon-tl--mute-user "Mute this user? ")
  (my/def-confirmer mastodon-tl--unmute-user "Unmute this user? ")
  (my/def-confirmer mastodon-tl--unmute-user "Unmute this user? ")

  (transient-define-prefix my/mastodon-toot ()
    "Mastodon toot actions."
    ["View"
     :class transient-row
     ("o" "Thread" mastodon-tl--thread)
     ("w" "Browser" my/mastodon-toot--browse)
     ("le" "List edits" mastodon-toot--view-toot-edits)
     ("lf" "List favouriters" mastodon-toot--list-toot-favouriters)
     ("lb" "List boosters" mastodon-toot--list-toot-boosters)]
    ["Toot Actions"
     :class transient-row
     ("r" "Reply" mastodon-toot--reply)
     ("v" "Vote" mastodon-tl--poll-vote)
     ("b" "Boost" my/mastodon-toot--toggle-boost-confirm)
     ("f" "Favourite" my/mastodon-toot--toggle-favourite-confirm)
     ("k" "Bookmark" my/mastodon-toot--toggle-bookmark-confirm)]
    ["My Toot Actions"
     :class transient-row
     ("md" "Delete" mastodon-toot--delete-toot)
     ("mD" "Delete and redraft" mastodon-toot--delete-and-redraft-toot)
     ("mp" "Pin" mastodon-toot--pin-toot-toggle)
     ("me" "Edit" mastodon-toot--edit-toot-at-point)]
    ["Profile Actions"
     :class transient-row
     ("pp" "Profile" mastodon-profile--show-user)
     ("pf" "List followers" mastodon-profile--open-followers)
     ("pF" "List following" mastodon-profile--open-following)
     ("ps" "List statues (no reblogs)" mastodon-profile--open-statuses-no-reblogs)]
    ["User Actions"
     :class transient-row
     ("uf" "Follow user" my/mastodon-tl--follow-user-confirm)
     ("uF" "Unfollow user" my/mastodon-tl--unfollow-user-confirm)
     ("ub" "Block user" my/mastodon-tl--block-user-confirm)
     ("uB" "Unblock user" my/mastodon-tl--unblock-user-confirm)
     ("um" "Mute user" my/mastodon-tl--mute-user-confirm)
     ("uB" "Unmute user" my/mastodon-tl--unmute-user-confirm)]
    ["Misc"
     :class transient-row
     ("q" "Quit" transient-quit-one)]))
#+end_src

*** ement.el
[[https://github.com/alphapapa/ement.el][ement.el]] is a Matrix client for Emacs. This package turned out to be somewhat complicated to setup.

**** General config
#+begin_src emacs-lisp
(use-package plz
  :straight (:host github :repo "alphapapa/plz.el")
  :defer t)

(defun my/ement ()
  (interactive)
  (ement-connect
   :user-id "@sqrtminusone:matrix.org"
   :password (my/password-store-get "My_Online/Accounts/matrix")))

(use-package ement
  :straight (:host github :repo "alphapapa/ement.el")
  :commands (ement-connect)
  :init
  (my-leader-def "ai" #'my/ement)
  :config
  (setq ement-room-list-auto-update t)
  (setq ement-room-mark-rooms-read 'send)
  (my/persp-add-rule
    ement-room-mode 3 "ement"
    ement-describe-room-mode 3 "ement"
    ement-room-occur-mode 3 "ement"
    ement-room-list-mode 3 "ement")
  ;; Room UI
  (setq ement-room-message-format-spec "%S> %W%B%r%R[%t]")
  (setq ement-room-left-margin-width 0)
  (setq ement-room-right-margin-width 10)
  (setq ement-room-sender-in-left-margin nil)
  (setq ement-room-sender-headers nil)
  (setq ement-room-sender-in-headers nil)
  (setq ement-room-wrap-prefix "-> ")
  ;; Changing some default faces
  (set-face-attribute 'ement-room-reactions nil :height 'unspecified)
  (set-face-attribute 'ement-room-reactions-key nil :height 'unspecified)
  (set-face-attribute 'ement-room-timestamp nil :inherit 'font-lock-function-name-face)
  (set-face-attribute 'ement-room-membership nil :height 0.9
                      :inherit 'font-lock-warning-face)
  (set-face-attribute 'ement-room-wrap-prefix nil :inherit 'unspecified)
  (set-face-attribute 'ement-room-timestamp-header nil :height 'unspecified)
  (set-face-attribute 'ement-room-wrap-prefix nil :inherit 'unspecified)
  ;; Notify only on mentions
  (setq ement-notify-notification-predicates
        '(ement-notify--event-mentions-session-user-p
          ement-notify--event-mentions-room-p
          ement-notify--room-unread-p))
  ;; Fix the anti-synergy with major mode re-activation in `ement-room-list-revert'
  (advice-add #'ement-room-list-revert
              :around #'my/perspective-assign-ignore-advice))
#+end_src

**** Keybindings
Some custom keymaps for room lists:
#+begin_src emacs-lisp
(with-eval-after-load 'ement-room-list
  (general-define-key
   :states '(normal visual)
   :keymaps '(ement-room-list-mode-map)
   "<tab>" #'magit-section-toggle
   "C-j" #'magit-section-forward
   "C-k" #'magit-section-backward
   "q" #'quit-window
   "gr" #'revert-buffer
   "RET" #'ement-room-list-RET))

(with-eval-after-load 'ement-tabulated-room-list
  (general-define-key
   :states '(normal visual)
   :keymaps '(ement-tabulated-room-list-mode-map)
   "q" #'quit-window))
#+end_src

#+begin_src emacs-lisp
(defun my/ement-room-send-reaction (key position)
  (interactive (list
                (completing-read "Add reaction: " (append telega-emoji-reaction-list '("👋")))
                (point)))
  (ement-room-send-reaction key position))

(defun my/ement-room-compose-quit ()
  (interactive)
  (when (or (string-empty-p (buffer-string))
            (y-or-n-p "Quit compose? "))
    (quit-window t)))

(defun my/ement-room-compose-setup ()
  (ement-room-compose-org)
  (setq company-backends '(telega-company-emoji company-capf))
  (general-define-key
   :states '(normal visual)
   :keymaps 'local
   "Q" #'my/ement-room-compose-quit
   "C-c C-k" (lambda () (interactive) (quit-window t))
   "C-c C-c" #'ement-room-compose-send))

(add-hook 'ement-room-compose-hook #'my/ement-room-compose-setup)
#+end_src

Also a keymap for room mode:
#+begin_src emacs-lisp
(with-eval-after-load 'ement
  (general-define-key
   :states '(normal visual)
   :keymaps '(ement-room-mode-map)
   "q" #'quit-window
   "?" #'ement-room-transient
   "C-u" #'ement-room-scroll-down-command
   "C-d" #'ement-room-scroll-up-mark-read
   "r" #'ement-room-write-reply
   "a" #'ement-room-send-message
   "i" #'ement-room-send-message
   "e" #'ement-room-edit-message
   "M-<RET>" #'ement-room-compose-message
   "<RET>" #'ement-room-send-message
   "K" #'ement-room-goto-prev
   "J" #'ement-room-goto-next
   "gr" #'ement-room-sync
   "g?" #'ement-describe-room
   "R?" #'ement-describe-room
   "Rm" #'ement-list-members
   "Rn" #'ement-room-set-notification-state
   "Rt" #'ement-room-set-topic
   "!" #'my/ement-room-send-reaction
   "m?" #'ement-room-view-event
   "Zf" #'ement-room-send-file
   "ui" #'ement-invite-user)
  (general-define-key
   :states '(normal visual)
   :keymaps '(ement-describe-room-mode-map)
   "q" #'quit-window)
  (general-define-key
   :states '(motion)
   :keymaps '(ement-room-mode-map)
   "C-u" #'ement-room-scroll-down-command
   "C-d" #'ement-room-scroll-up-mark-read))
#+end_src

**** Various functions
Scroll to the previous mention.

#+begin_quote
 alphapapa 🐃​> And, yes, that is a currently unsolved problem. As I said, in the future we can try using a different API endpoint to access those notifications similarly to Element. In the meantime, you can load old messages (e.g. "C-u 1000 M-v" to load 1000 old ones at a time), until you find it, maybe using "C-s sqrtm" to search for messages mentioning you.

Or you can load up Element for a moment to see what the mention was, if that's easier.
#+end_quote

#+begin_src emacs-lisp
(defun my/ement-about-me-p (event)
  (let ((me (ement-user-id (ement-session-user ement-session))))
    (or
     (equal (ement-user-id (ement-event-sender event)) me)
     (when-let ((formatted-body
                 (alist-get
                  'formatted_body
                  (ement-event-content event))))
       (string-match-p me formatted-body)))))

(defun my/ement-scroll-to-previous-about-me ()
  (interactive)
  (let ((scrolled 0))
    (when (< (line-number-at-pos) 20)
      (forward-line 20))
    (if ement-room-retro-loading
        (run-with-timer 0.5 nil #'my/ement-scroll-to-previous-about-me)
      (while (let ((event (ewoc-data (ewoc-locate ement-ewoc))))
               (and
                (not ement-room-retro-loading)
                (or
                 (not (ement-event-p event))
                 (not (my/ement-about-me-p event)))))
        (condition-case _err
            (scroll-down 1)
          (beginning-of-buffer
           (call-interactively #'ement-room-retro)
           (run-with-timer 0.5 nil #'my/ement-scroll-to-previous-about-me)))
        (cl-incf scrolled)
        (message "Scrolled %s" scrolled)))))
#+end_src
*** Telega
[[https://github.com/zevlg/telega.el/][telega.el]] is a Telegam client for Emacs.

| Guix dependency   |
|-------------------|
| tdlib-1.8.15      |
| font-gnu-unifont  |
| font-gnu-freefont |

#+begin_src emacs-lisp
(use-package telega
  :straight t
  :if (not (or my/remote-server my/is-termux))
  :commands (telega)
  :init
  (my-leader-def "a l" (my/command-in-persp "telega" "telega" 3 (telega)))
  (my/use-colors
   (telega-button-active :foreground (my/color-value 'base0)
                         :background (my/color-value 'cyan))
   (telega-webpage-chat-link :foreground (my/color-value 'base0)
                             :background (my/color-value 'fg)))
  :config
  (setq telega-emoji-use-images nil)
  (general-define-key
   :keymaps '(telega-root-mode-map telega-chat-mode-map)
   :states '(normal)
   "gp" telega-prefix-map)
  (general-define-key
   :keymaps '(telega-msg-button-map)
   "<SPC>" nil)
  (general-define-key
   :keymaps '(telega-chat-mode-map)
   "C-<return>" #'newline)
  (my/persp-add-rule
    telega-root-mode 3 "telega"
    telega-chat-mode 3 "telega"
    telega-image-mode 3 "telega"
    telega-webpage-mode 3 "telega"))
#+end_src

Building =telega-server= can create problems. It requires the latest version of =tdlib=, which isn't available anywhere, but I can inherit the Guix package definition.
#+begin_src emacs-lisp
(defun my/telega-server-build ()
  (interactive)
  (setq telega-server-libs-prefix
        (string-trim
         (shell-command-to-string "guix build tdlib-1.8.15")))
  (telega-server-build "CC=gcc"))
#+end_src

Setting up the modeline. The default mode string doesn't look great with my other modeline modules, so I override that.
#+begin_src emacs-lisp
(add-hook 'telega-load-hook #'telega-mode-line-mode)
(setq telega-mode-line-string-format
      '("["
        (:eval
         (telega-mode-line-online-status))
        (:eval
         (when telega-use-tracking-for
           (telega-mode-line-tracking)))
        (:eval
         (telega-mode-line-unread-unmuted))
        (:eval
         (telega-mode-line-mentions 'messages))
        "]"))
#+end_src

Configuring company backends for the chat buffer, as recommended in the manual:
#+begin_src emacs-lisp
(defun my/telega-chat-setup ()
  (set (make-local-variable 'company-backends)
       (append (list telega-emoji-company-backend
                     'telega-company-username
                     'telega-company-hashtag
                     'telega-company-markdown-precode)
               (when (telega-chat-bot-p telega-chatbuf--chat)
                 '(telega-company-botcmd))))
  (company-mode 1))
(add-hook 'telega-chat-mode-hook #'my/telega-chat-setup)
#+end_src

And custom online status. By default it marks you online when the Emacs frame is active, but I use EXWM, so I change that to when =telega.el= buffer is active. Otherwise, I'm online all the time.
#+begin_src emacs-lisp
(defun my/telega-online-status ()
  (derived-mode-p 'telega-root-mode 'telega-chat-mode
                  'telega-image-mode 'telega-webpage-mode))

(setq telega-online-status-function #'my/telega-online-status)
#+end_src
*** Google Translate
Emacs interface to Google Translate.

Can't make it load lazily for some strange reason.

References:
- [[https://github.com/atykhonov/google-translate][google-translate repo]]
- [[https://github.com/atykhonov/google-translate/issues/137#issuecomment-728278849][issue with ttk error fix]]

#+begin_src emacs-lisp
(use-package google-translate
  :straight t
  :if (not my/remote-server)
  :functions (my-google-translate-at-point google-translate--search-tkk)
  :custom
  (google-translate-backend-method 'curl)
  :config
  (require 'facemenu)
  (defun google-translate--search-tkk ()
    "Search TKK."
    (list 430675 2721866130))
  (defun my-google-translate-at-point()
    "reverse translate if prefix"
    (interactive)
    (if current-prefix-arg
        (google-translate-at-point)
      (google-translate-at-point-reverse)))
  (setq google-translate-translation-directions-alist
        '(("en" . "ru")
          ("ru" . "en"))))

(my-leader-def
  :infix "at"
  "" '(:which-key "google translate")
  "p" 'google-translate-at-point
  "P" 'google-translate-at-point-reverse
  "q" 'google-translate-query-translate
  "Q" 'google-translate-query-translate-reverse
  "t" 'google-translate-smooth-translate)
#+end_src
*** biome
[[https://github.com/SqrtMinusOne/biome][biome]] is my [[https://open-meteo.com/][open-meteo]] client.

#+begin_src emacs-lisp
(use-package biome
  :straight (:host github :repo "SqrtMinusOne/biome")
  :commands (biome)
  :init
  (my-leader-def "ab" #'biome)
  :config
  (add-to-list 'biome-query-coords
               '("Saint-Petersburg, Russia" 59.93863 30.31413))
  (add-to-list 'biome-query-coords
               '("Tyumen, Russia" 57.15222 65.52722)))
#+end_src
** Reading documentation
*** tldr
[[https://tldr.sh/][tldr]] is a collaborative project providing cheatsheets for various console commands. For some reason, the built-in download in the package is broken, so I use my own function.

#+begin_src emacs-lisp
(use-package tldr
  :straight t
  :commands (tldr)
  :config
  (setq tldr-source-zip-url "https://github.com/tldr-pages/tldr/archive/refs/heads/main.zip")

  (defun tldr-update-docs ()
    (interactive)
    (shell-command-to-string (format "curl -L %s --output %s" tldr-source-zip-url tldr-saved-zip-path))
    (when (file-exists-p "/tmp/tldr")
      (delete-directory "/tmp/tldr" t))
    (shell-command-to-string (format "unzip -d /tmp/tldr/ %s" tldr-saved-zip-path))
    (when (file-exists-p tldr-directory-path)
      (delete-directory tldr-directory-path 'recursive 'no-trash))
    (shell-command-to-string (format "mv %s %s" "/tmp/tldr/tldr-main" tldr-directory-path))))

(my-leader-def "hT" 'tldr)
#+end_src
*** man & info
Of course, Emacs can also display man and info pages.

#+begin_src emacs-lisp
(setq Man-width-max 180)
(my-leader-def "hM" 'woman)
(setq woman-fill-column 90)

(general-define-key
 :states '(normal)
 :keymaps 'Info-mode-map
 (kbd "RET") #'Info-follow-nearest-node
 "H" #'Info-history-back
 "L" #'Info-history-forward
 "n" #'Info-search-next
 "b" #'Info-search-backward
 "f" #'ace-link-info)

(defun my/man-fix-width (&rest _)
  (setq-local Man-width (- (window-width) 4)))

(advice-add #'Man-update-manpage :before #'my/man-fix-width)
#+end_src
*** devdocs.io
There is a package called =devdocs= that does more or less the same, but I like =devdocs-browser= more because it uses =eww=.

#+begin_src emacs-lisp
(use-package devdocs-browser
  :straight t
  :init
  (my-leader-def
    :infix "hd"
    "" '(:wk "devdocs")
    "d" #'devdocs-browser-open
    "o" #'devdocs-browser-open-in
    "i" #'devdocs-browser-install-doc
    "n" #'devdocs-browser-uninstall-doc
    "o" #'devdocs-browser-download-offline-data
    "O" #'devdocs-browser-remove-offline-data
    "u" #'devdocs-browser-upgrade-all-docs
    "r" #'devdocs-browser-update-docs))
#+End_src
*** StackExchange
[[https://github.com/vermiculus/sx.el][sx.el]] is a StackExchange client for Emacs.

#+begin_src emacs-lisp
(use-package sx
  :straight t
  :config
  (general-define-key
   :states '(normal)
   :keymaps '(sx-question-mode-map sx-question-list-mode-map)
   "go" #'sx-visit-externally
   "q" #'quit-window
   "s*" #'sx-tab-starred
   "sU" #'sx-tab-unanswered-my-tags
   "sa" #'sx-ask
   "sf" #'sx-tab-featured
   "sh" #'sx-tab-frontpage
   "si" #'sx-inbox
   "sm" #'sx-tab-meta-or-main
   "sn" #'sx-tab-newest
   "su" #'sx-tab-unanswered
   "sv" #'sx-tab-topvoted
   "sw" #'sx-tab-week
   "u" #'sx-upvote
   "d" #'sx-downvote
   "j" nil
   "k" nil)
  (general-define-key
   :states '(normal)
   :keymaps '(sx-question-mode-map)
   "gr" #'sx-question-mode-refresh
   "J" #'sx-question-mode-next-section
   "K" #'sx-question-mode-previous-section
   "a" #'sx-answer
   "e" #'sx-edit
   "D" #'sx-delete
   "c" #'sx-comment)
  (general-define-key
   :states '(normal)
   :keymaps '(sx-question-list-mode-map)
   "RET" 'sx-display
   "j" #'sx-question-list-next
   "k" #'sx-question-list-previous
   "S" #'sx-search
   "m" #'sx-question-list-mark-read
   "O" #'sx-question-list-order-by
   "t" #'sx-tab-switch)
  (my-leader-def
   "hs" #'sx-search
   "hS" #'sx-tab-frontpage)
  (my/use-colors
   (sx-question-mode-accepted :foreground (my/color-value 'green)
                              :weight 'bold)
   (sx-question-mode-content :background nil))
  (add-hook 'sx-question-mode-hook #'doom-modeline-mode)
  (add-hook 'sx-question-list-mode-hook #'doom-modeline-mode))
#+end_src
** Utilities
*** pass
I use [[https://www.passwordstore.org/][pass]] as my password manager. Expectedly, there is Emacs frontend for it.

This package is pretty good to manage the password database. I use [[https://github.com/SqrtMinusOne/password-store-ivy][password-store-ivy]] (another package of mine) to actually type passwords. [[https://github.com/carnager/rofi-pass][rofi-pass]] is another good option.

#+begin_src emacs-lisp
(use-package pass
  :straight t
  :commands (pass)
  :init
  (my-leader-def "ak" #'pass)
  :config
  (setq pass-show-keybindings nil))
#+end_src

Also I use =password-store-get= in a few places in my config, and by default it returns =nil= if I make an error in the password, which inconvinient if I want to run the command in =setq=. So:
#+begin_src emacs-lisp
(defun my/password-store-get (entry)
  (if-let ((res (password-store-get entry)))
      res
    (my/password-store-get entry)))
#+end_src
*** Docker
A package to manage docker containers from Emacs.

#+begin_src emacs-lisp
(use-package docker
  :straight t
  :if (not (or my/remote-server my/is-termux))
  :commands (docker)
  :init
  (my-leader-def "ao" 'docker))
#+end_src

*** screenshot.el
Tecosaur's plugin to make beautiful code screenshots.

| Guix dependency |
|-----------------|
| imagemagick     |

#+begin_src emacs-lisp
(use-package screenshot
  :straight (:repo "tecosaur/screenshot"
                   :host github
                   :build (:not compile))
  :if (display-graphic-p)
  :commands (screenshot)
  :init
  (my-leader-def "S" 'screenshot))
#+end_src
*** proced
proced is an Emacs built-it process viewer, like top.

#+begin_src emacs-lisp
(my-leader-def "ah" 'proced)
(setq proced-auto-update-interval 1)
(add-hook 'proced-mode-hook (lambda ()
                              (visual-line-mode -1)
                              (setq-local truncate-lines t)
                              (proced-toggle-auto-update 1)))
#+end_src
*** Guix
An Emacs package to help managing GNU Guix.

#+begin_src emacs-lisp
(use-package guix
  :straight t
  :if (not (or my/remote-server my/is-termux))
  :commands (guix)
  :init
  (my-leader-def "ag" 'guix)
  (defun geiser-company--setup (&rest args)
    "A dummy function.")
  (defvar geiser-repl-company-p nil
    "A dummy variable."))
#+end_src
*** Atomic Chrome
[[https://github.com/alpha22jp/atomic-chrome][Atomic Chrome]] is an extension that allows to edit browser text fields in Emacs. Despite its name, it also works for Firefox with [[https://ghosttext.fregante.com/welcome/][GhostText]], which is what I use.

#+begin_src emacs-lisp
(use-package atomic-chrome
  :if (not (or my/remote-server my/is-termux))
  :commands (atomic-chrome-start-server)
  :straight t)
#+end_src

*** Pinentry
Emacs-based pinentry works great on Termux.

#+begin_src emacs-lisp
(use-package pinentry
  :straight t
  :if my/is-termux
  :config
  (setenv "GPG_AGENT_INFO" nil) ;; use emacs pinentry
  (setq auth-source-debug t)

  (setq epg-gpg-program "gpg2") ;; not necessary
  (require 'epa-file)
  (epa-file-enable)
  (setq epa-pinentry-mode 'loopback)
  (setq epg-pinentry-mode 'loopback)
  (pinentry-start))
#+end_src
** Productivity
*** pomm
My package for doing Pomodoro timer.

#+begin_src emacs-lisp
(use-package pomm
  :straight t
  ;; :straight (:local-repo "~/Code/Emacs/pomm" :files (:defaults "resources"))
  :commands (pomm pomm-third-time)
  :init
  (my-leader-def "ap" #'pomm-third-time)
  (setq alert-default-style 'libnotify)
  :config
  (pomm-mode-line-mode))
#+end_src
*** hledger
[[hledger.org/][hledger]] is a plain-text double-entry accounting software. I use it for managing my personal finances, and thus far it's great.

| Guix dependency |
|-----------------|
| hledger         |

#+begin_src emacs-lisp
(use-package hledger-mode
  :straight t
  :mode (rx ".journal" eos)
  :config
  (setq hledger-jfile (concat org-directory "/ledger/ledger.journal"))
  (add-hook 'hledger-mode-hook
            (lambda ()
              (make-local-variable 'company-backends)
              (add-to-list 'company-backends 'hledger-company))))

(use-package flycheck-hledger
  :straight t
  :after (hledger-mode))
#+end_src

Here are some usage notes.

The fastest way to enter new entiries to the journal is by running =hledger add=

Then, run =hledger bs= to check whether the balance sheet matches the ground truth (e.g. the bank UI).

If it doesn't the simplest way to check for the differences is by running =hledger register <item>=.

Here are some interesting commands to run:
- =hledger incomestatement <query>=, where =<query>= is the account prefix. e.g. =expenses= or =revenues=.
  - add =--pivot=payee= to get grouping by transaction descriptions
  - add =-B= to cast currencies

*** Calendar
Emacs' built-in calendar. Can even calculate sunrise and sunset times.

#+begin_src emacs-lisp
(setq calendar-date-style 'iso) ;; YYYY/mm/dd
(setq calendar-week-start-day 1)
(setq calendar-time-display-form '(24-hours ":" minutes))

(setq calendar-latitude 59.9375)
(setq calendar-longitude 30.308611)
#+end_src
** Fun
*** Discord integration
Integration with Discord. Shows which file is being edited in Emacs.

In order for this to work in Guix, a service is necessary - [[file:Desktop.org::*Discord rich presence][Discord rich presence]].

Some functions to override the displayed message:
#+begin_src emacs-lisp
(defun my/elcord-mask-buffer-name (name)
  (cond
   ((string-match-p (rx bos (? "CAPTURE-") (= 14 num) "-" (* not-newline) ".org" eos) name)
    "<ORG-ROAM>")
   ((string-match-p (rx bos (+ num) "-" (+ num) "-" (+ num) ".org" eos) name)
    "<ORG-JOURNAL>")
   ((string-match-p (rx bos "EXWM") name)
    "<EXWM>")
   ((string-match-p (rx bos "*Org-Habit") name)
    "<ORG>")
   ((with-current-buffer (get-buffer name)
      (derived-mode-p 'telega-root-mode 'telega-chat-mode))
    "<TELEGA>")
   (t name)))

(defun my/elcord-buffer-details-format-functions ()
  (format "Editing %s" (my/elcord-mask-buffer-name (buffer-name))))

(defun my/elcord-update-presence-mask-advice (r)
  (list (my/elcord-mask-buffer-name (nth 0 r)) (nth 1 r)))
#+end_src

And the package configuration:
#+begin_src emacs-lisp
(use-package elcord
  :straight t
  :if (and (or
            (string= (system-name) "indigo")
            (string= (system-name) "eminence")
            (string= (system-name) "iris"))
           (not my/slow-ssh)
           (not my/remote-server))
  :config
  (setq elcord-buffer-details-format-function #'my/elcord-buffer-details-format-functions)
  (advice-add 'elcord--try-update-presence :filter-args #'my/elcord-update-presence-mask-advice)
  (add-to-list 'elcord-mode-text-alist '(telega-chat-mode . "Telega Chat"))
  (add-to-list 'elcord-mode-text-alist '(telega-root-mode . "Telega Root"))
  (elcord-mode))
#+end_src
*** Snow
#+begin_src emacs-lisp
(use-package snow
  :straight (:repo "alphapapa/snow.el" :host github)
  :commands (snow))
#+end_src
*** Power mode
When Emacs doesn't feel powerful enough.

Watch out if you are using EXWM.

#+begin_src emacs-lisp
(use-package power-mode
  :straight (:host github :repo "elizagamedev/power-mode.el")
  :disabled
  :commands (power-mode))
#+end_src
*** Redacted
#+begin_src emacs-lisp
(use-package redacted
  :commands (redacted-mode)
  :straight (:host github :repo "bkaestner/redacted.el"))
#+end_src
*** Zone
#+begin_src emacs-lisp
(use-package zone
  :ensure nil
  :config
  (setq original-zone-programs (copy-sequence zone-programs)))

(defun my/zone-with-select ()
  (interactive)
  (ivy-read "Zone programs"
            (cl-pairlis
             (cl-mapcar 'symbol-name original-zone-programs)
             original-zone-programs)
            :action (lambda (elem)
                      (setq zone-programs (vector (cdr elem)))
                      (zone))))
#+end_src

*** Gource
[[https://gource.io/][Gource]] is a program that draws an animated graph of users changing the repository over time.

Although it can work without extra effort (just run =gource= in a [[https://git-scm.com/][git]] repo), there are some tweaks that can be done:
- Gource supports using custom pictures for users. [[https://en.gravatar.com/][Gravatar]] is an obvious place to get these.
- Occasionally, the same people have different names and/or emails in history.\\
  It may happen when people use forges like [[https://gitlab.com/][GitLab]] or just have different settings on different machines. It would be nice to merge these names.
- Visualizing the history of multiple repositories (e.g. frontend and backend) requires combining multiple gource logs.

So, why not try doing that with Emacs?

**** Gravatars
Much to my surprise, Emacs turned out to have a built-in package called [[https://github.com/emacs-mirror/emacs/blob/master/lisp/image/gravatar.el][gravatar.el]].

So, let's make a function to retrieve a gravatar and save it:
#+begin_src emacs-lisp
(defun my/gravatar-retrieve-sync (email file-name)
  "Get gravatar for EMAIL and save it to FILE-NAME."
  (let ((gravatar-default-image "identicon")
        (gravatar-size nil)
        (coding-system-for-write 'binary)
        (write-region-annotate-functions nil)
        (write-region-post-annotation-function nil))
    (write-region
     (image-property (gravatar-retrieve-synchronously email) :data)
     nil file-name nil :silent)))
#+end_src

To use these images, we need to save them to some folder and use usernames as file names. The folder:
#+begin_src emacs-lisp
(setq my/gravatar-folder "/home/pavel/.cache/gravatars/")
#+end_src

And the function that downloads a gravatar if necessary:
#+begin_src emacs-lisp
(defun my/gravatar-save (email author)
  "Download gravatar for EMAIL.

AUTHOR is the username."
  (let ((file-name (concat my/gravatar-folder author ".png")))
    (mkdir my/gravatar-folder t)
    (unless (file-exists-p file-name)
      (message "Fetching gravatar for %s (%s)" author email)
      (my/gravatar-retrieve-sync email file-name))))
#+end_src

**** Merging authors
Now to merging authors.

Gource itself uses only usernames (without emails), but we can use =git log= to get both. The required information can be extracted like that:
#+begin_src bash
git log --pretty=format:"%ae|%an" | sort | uniq -c | sed "s/^[ \t]*//;s/ /|/"
#+end_src

The output is a list of pipe-separated strings, where the values are:
- Number of occurrences for this combination of username and email
- Email
- Username

Of course, that part would have to be changed appropriately for other version control systems if you happen to use one.

So, below is one hell of a function that wraps this command and tries to merge emails and usernames belonging to one author:
#+begin_src emacs-lisp
(defun my/git-get-authors (repo &optional authors-init)
  "Extract and merge all combinations of authors & emails from REPO.

REPO is the path to a git repository.

AUTHORS-INIT is the previous output of `my/git-get-authors'.  It can
be used to extract that information from multiple repositories.

The output is a list of alists with following keys:
- emails: list of (<email> . <count>)
- authors: list of (<username> . <count>)
- email: the most popular email
- author: the most popular username
I.e. one alist is all emails and usernames of one author."
  (let* ((default-directory repo)
         (data (shell-command-to-string
                "git log --pretty=format:\"%ae|%an\" | sort | uniq -c | sed \"s/^[ \t]*//;s/ /|/\""))
         (authors
          (cl-loop for string in (split-string data "\n")
                   if (= (length (split-string string "|")) 3)
                   collect (let ((datum (split-string string "|")))
                             `((count . ,(string-to-number (nth 0 datum)))
                               (email . ,(downcase (nth 1 datum)))
                               (author . ,(nth 2 datum)))))))
    (mapcar
     (lambda (datum)
       (setf (alist-get 'author datum)
             (car (cl-reduce
                   (lambda (acc author)
                     (if (> (cdr author) (cdr acc))
                         author
                       acc))
                   (alist-get 'authors datum)
                   :initial-value '(nil . -1))))
       (setf (alist-get 'email datum)
             (car (cl-reduce
                   (lambda (acc email)
                     (if (> (cdr email) (cdr acc))
                         email
                       acc))
                   (alist-get 'emails datum)
                   :initial-value '(nil . -1))))
       datum)
     (cl-reduce
      (lambda (acc val)
        (let* ((author (alist-get 'author val))
               (email (alist-get 'email val))
               (count (alist-get 'count val))
               (saved-value
                (seq-find
                 (lambda (cand)
                   (or (alist-get email (alist-get 'emails cand)
                                  nil nil #'string-equal)
                       (alist-get author (alist-get 'authors cand)
                                  nil nil #'string-equal)
                       (alist-get email (alist-get 'authors cand)
                                  nil nil #'string-equal)
                       (alist-get author (alist-get 'emails cand)
                                  nil nil #'string-equal)))
                 acc)))
          (if saved-value
              (progn
                (if (alist-get email (alist-get 'emails saved-value)
                               nil nil #'string-equal)
                    (cl-incf (alist-get email (alist-get 'emails saved-value)
                                        nil nil #'string-equal)
                             count)
                  (push (cons email count) (alist-get 'emails saved-value)))
                (if (alist-get author (alist-get 'authors saved-value)
                               nil nil #'string-equal)
                    (cl-incf (alist-get author (alist-get 'authors saved-value)
                                        nil nil #'string-equal)
                             count)
                  (push (cons author count) (alist-get 'authors saved-value))))
            (setq saved-value
                  (push `((emails . ((,email . ,count)))
                          (authors . ((,author . ,count))))
                        acc)))
          acc))
      authors
      :initial-value authors-init))))
#+end_src

Despite the probable we-enjoy-typing-ness of the implementation, it's actually pretty simple:
- The output of =git log= is parsed into a list of alists with =count=, =email= and =author= as keys.
- This list is reduced by =cl-reduce= into a list of alists with =emails= and =authors= as keys and the respective counts as values, e.g. =((<email-1> . 1) (<email-2> . 3))=.\\
  I've seen a couple of cases where people would swap their username and email (lol), so =seq-find= also looks for an email in the list of authors and vice versa.
- The =mapcar= call determines the most popular email and username for each authors.

The output is another list of alists, now with the following keys:
- =emails= - list of elements like =(<email> . <count>)=
- =authors= - list of elements like =(<author-name> . <count>)=
- =email= - the most popular email
- =author= - the most popular username.

**** Running for multiple repos
This section was mostly informed by [[https://github.com/acaudwell/Gource/wiki/Visualizing-Multiple-Repositories][this page]] in the [[https://github.com/acaudwell/Gource/wiki][gource wiki]].

As I said above, by default =gource= just creates a visualization for the current repo. To change something in it, we need to invoke the program like that: =gource --output-custom-log PATH=, where =PATH= is either the path to the log file or =-= for stdout.

The log consists of lines of pipe-separated strings, e.g.:
#+begin_example
1600769568|dsofronov|A|/studentor/.dockerignore
1600769568|dsofronov|A|/studentor/.editorconfig
1600769568|dsofronov|A|/studentor/.flake8
1600769568|dsofronov|A|/studentor/.gitignore
#+end_example

where the values of one line are:
- UNIX timestamp
- Author name
- =A= for add, =M= for modify, and =D= for delete
- Path to file

The file has to be sorted by the timestamp in ascending order.

So, the function that prepares the log for one repository:
#+begin_src emacs-lisp
(defun my/gource-prepare-log (repo authors)
  "Create gource log string for REPO.

AUTHORS is the output of `my/git-get-authors'."
  (let ((log (shell-command-to-string
              (concat
               "gource --output-custom-log - "
               repo)))
        (authors-mapping (make-hash-table :test #'equal))
        (prefix (file-name-base repo)))
    (cl-loop for author-datum in authors
             for author = (alist-get 'author author-datum)
             do (my/gravatar-save (alist-get 'email author-datum) author)
             do (cl-loop for other-author in (alist-get 'authors author-datum)
                         unless (string-equal (car other-author) author)
                         do (puthash (car other-author) author
                                     authors-mapping)))
    (cl-loop for line in (split-string log "\n")
             concat (let ((fragments (split-string line "|")))
                      (when (> (length fragments) 3)
                        (when-let (mapped-author (gethash (nth 1 fragments)
                                                          authors-mapping))
                          (setf (nth 1 fragments) mapped-author))
                        (setf (nth 3 fragments)
                              (concat "/" prefix (nth 3 fragments))))
                      (string-join fragments "|"))
             concat "\n")))
#+end_src

This function:
- Downloads a gravatar for each author
- Replaces all usernames of one author with the most frequent one
- Prepends the file path with the repository name.

The output is a string in the gource log format as described above.

Finally, as we need to invoke all of this for multiple repositories, why not do that with [[https://www.gnu.org/software/emacs/manual/html_node/emacs/Dired.html][dired]]:
#+begin_src emacs-lisp
(defun my/gource-dired-create-logs (repos log-name)
  "Create combined gource log for REPOS.

REPOS is a list of strings, where a string is a path to a git repo.
LOG-NAME is the path to the resulting log file.

This function is meant to be invoked from `dired', where the required
repositories are marked."
  (interactive (list (or (dired-get-marked-files nil nil #'file-directory-p)
                         (user-error "Select at least one directory"))
                     (read-file-name "Log file name: " nil "combined.log")))
  (let ((authors
         (cl-reduce
          (lambda (acc repo)
            (my/git-get-authors repo acc))
          repos
          :initial-value nil)))
    (with-temp-file log-name
      (insert
       (string-join
        (seq-filter
         (lambda (line)
           (not (string-empty-p line)))
         (seq-sort-by
          (lambda (line)
            (if-let (time (car (split-string line "|")))
                (string-to-number time)
              0))
          #'<
          (split-string
           (mapconcat
            (lambda (repo)
              (my/gource-prepare-log repo authors))
            repos "\n")
           "\n")))
        "\n")))))
#+end_src

This function extracts authors from each repository and merges the logs as required by gource, that is sorting the result by time in ascending order.

**** Using the function
To use the function above, mark the required repos in a dired buffer and run =M-x my/gource-dired-create-logs=. This also works nicely with [[https://github.com/Fuco1/dired-hacks][dired-subtree]], in case your repos are located in different folders.

The function will create a combined log file (by default =combined.log=). To visualize the log, run:
#+begin_src bash
gource <log-file> --user-image-dir <path-to-gravatars>
#+end_src

Check the [[https://github.com/acaudwell/Gource][README]] for possible parameters, such as the speed of visualization, different elements, etc. That's it!

I thought about making something like a [[https://github.com/magit/transient][transient.el]] wrapper around the =gource= command but figured it wasn't worth the effort for something that I run just a handful of times in a year.

* Guix settings
| Guix dependency     | Description                   |
|---------------------+-------------------------------|
| emacs-vterm         | The vterm package             |
| ripgrep             | A recursive search tool       |
| the-silver-searcher | Another recursive search tool |
| texinfo             |                               |

#+NAME: packages
#+begin_src emacs-lisp :tangle no
(when (fboundp #'my/format-guix-dependencies)
  (my/format-guix-dependencies))
#+end_src

#+begin_src scheme :tangle .config/guix/manifests/emacs.scm :noweb yes
(specifications->manifest
 '("emacs-next-tree-sitter"
   <<packages()>>))
#+end_src
