#+title: Emacs Configuration

* Package Setup

Bootstrap package management. I use =elpaca= with =use-package= to allow asynchronous declarative package management. This is just the necessary boilerplate.
#+begin_src emacs-lisp
  (defvar elpaca-installer-version 0.10)
  (defvar elpaca-directory (expand-file-name "elpaca/" user-emacs-directory))
  (defvar elpaca-builds-directory (expand-file-name "builds/" elpaca-directory))
  (defvar elpaca-repos-directory (expand-file-name "repos/" elpaca-directory))
  (defvar elpaca-order '(elpaca :repo "https://github.com/progfolio/elpaca.git"
                                :ref nil :depth 1 :inherit ignore
                                :files (:defaults "elpaca-test.el" (:exclude "extensions"))
                                :build (:not elpaca--activate-package)))
  (let* ((repo  (expand-file-name "elpaca/" elpaca-repos-directory))
         (build (expand-file-name "elpaca/" elpaca-builds-directory))
         (order (cdr elpaca-order))
         (default-directory repo))
    (add-to-list 'load-path (if (file-exists-p build) build repo))
    (unless (file-exists-p repo)
      (make-directory repo t)
      (when (<= emacs-major-version 28) (require 'subr-x))
      (condition-case-unless-debug err
          (if-let* ((buffer (pop-to-buffer-same-window "*elpaca-bootstrap*"))
                    ((zerop (apply #'call-process `("git" nil ,buffer t "clone"
                                                    ,@(when-let* ((depth (plist-get order :depth)))
                                                        (list (format "--depth=%d" depth) "--no-single-branch"))
                                                    ,(plist-get order :repo) ,repo))))
                    ((zerop (call-process "git" nil buffer t "checkout"
                                          (or (plist-get order :ref) "--"))))
                    (emacs (concat invocation-directory invocation-name))
                    ((zerop (call-process emacs nil buffer nil "-Q" "-L" "." "--batch"
                                          "--eval" "(byte-recompile-directory \".\" 0 'force)")))
                    ((require 'elpaca))
                    ((elpaca-generate-autoloads "elpaca" repo)))
              (progn (message "%s" (buffer-string)) (kill-buffer buffer))
            (error "%s" (with-current-buffer buffer (buffer-string))))
        ((error) (warn "%s"

                       err) (delete-directory repo 'recursive))))
    (unless (require 'elpaca-autoloads nil t)
      (require 'elpaca)
      (elpaca-generate-autoloads "elpaca" repo)
      (load "./elpaca-autoloads")))
  (add-hook 'after-init-hook #'elpaca-process-queues)
  (elpaca `(,@elpaca-order))

  (setq use-package-always-ensure t)

  (elpaca elpaca-use-package
    (elpaca-use-package-mode))
#+end_src

* Appearance

** Mode Line

Show the column number in the mode line.
#+begin_src emacs-lisp
  (column-number-mode 1)
#+end_src

Display the current time in the mode line.
#+begin_src emacs-lisp
  (display-time-mode)
#+end_src

** Colours!

=dired= needs more colour in my opinion. :3
#+begin_src emacs-lisp
  (use-package diredfl
    :init
    (diredfl-global-mode 1))
#+end_src

This package helps visually match delimiter pairs.
#+begin_src emacs-lisp
  (use-package rainbow-delimiters
    :hook
    (prog-mode . rainbow-delimiters-mode))
#+end_src

** macOS

This improves the look of the title-bar on macOS to make it look like other native applications.
#+begin_src emacs-lisp
  (use-package ns-auto-titlebar
    :init
    (when (memq window-system '(mac ns x))
      (ns-auto-titlebar-mode)))
#+end_src

** Miscellaneous

Show line numbers by default.
#+begin_src emacs-lisp
  (global-display-line-numbers-mode 1)
#+end_src

Install and configure =visual-fill-column= to make some file types display with a narrow window centred in the frame.
#+begin_src emacs-lisp
  (defun jj/run-visual-line-mode ()
    "run visual-line-mode"
    (visual-line-mode)
    (visual-fill-column-mode)
    (setq visual-fill-column-width 100
          visual-fill-column-center-text t))
  (use-package visual-fill-column
    :hook
    (org-mode . jj/run-visual-line-mode)
    (markdown-mode . jj/run-visual-line-mode)
    :config
    (setq visual-fill-column-width 100
          visual-fill-column-center-text t))
#+end_src

* Behaviour

** Paths

Make Emacs use the correct =PATH= variable as macOS fails to load the =PATH= variable from my login shell.
#+begin_src emacs-lisp
  (use-package exec-path-from-shell
    :init
    (when (memq window-system '(mac ns x))
      (exec-path-from-shell-initialize)))
#+end_src

Disable =ls= for =dired=; the =--dired= option is not supported on macOS.
#+begin_src emacs-lisp
  (setq dired-use-ls-dired nil)
#+end_src

** Whitespace

Default to spaces over tabs and use a width of 4 by default.
#+begin_src emacs-lisp
  (setq-default indent-tabs-mode nil)
  (setq tab-width 4
        c-basic-offset tab-width)
#+end_src

Make Emacs delete trailing whitspace on save. This does not happen in =markdown-mode= which sometimes needs trailing whitespace.
#+begin_src emacs-lisp
  (add-hook 'before-save-hook
            (lambda ()
              (unless (eql (with-current-buffer (current-buffer) major-mode)
                           'markdown-mode)
                (delete-trailing-whitespace))))
#+end_src

** Window Management

Configure superior Emacs window management with =windmove=.
#+begin_src emacs-lisp
  (keymap-global-set "C-c w h" 'windmove-left)
  (keymap-global-set "C-c w j" 'windmove-down)
  (keymap-global-set "C-c w k" 'windmove-up)
  (keymap-global-set "C-c w l" 'windmove-right)

  (keymap-global-set "C-c C-w h" 'windmove-swap-states-left)
  (keymap-global-set "C-c C-w j" 'windmove-swap-states-down)
  (keymap-global-set "C-c C-w k" 'windmove-swap-states-up)
  (keymap-global-set "C-c C-w l" 'windmove-swap-states-right)
#+end_src

Automatically increase the size of the focused window.
#+begin_src emacs-lisp
  (use-package zoom
   :init
   (zoom-mode)
   :config
   (setq zoom-size '(0.618 . 0.618)))
#+end_src

** Miscellaneous

I hate macOS scroll inertia. Scrolling in one window, switching to Emacs, and hitting control occasionally changes the text size and can even cause Emacs (and my window manager for some reason) to hang forcing me to force quit Emacs.
#+begin_src emacs-lisp
  (global-unset-key (kbd "<C-wheel-up>"))
  (global-unset-key (kbd "<C-wheel-down>"))
#+end_src

Disable the bell sound on invalid commands.
#+begin_src emacs-lisp
  (setq ring-bell-function 'ignore)
#+end_src

Make Emacs confirm that I want to close it on kill.
#+begin_src emacs-lisp
  (setq confirm-kill-emacs 'yes-or-no-p)
#+end_src

Create directories if they don't exist when finding a file where the directory isn't found.
#+begin_src emacs-lisp
  (add-to-list 'find-file-not-found-functions
               (lambda ()
                 (let ((parent-directory (file-name-directory buffer-file-name)))
                   (when (and (not (file-exists-p parent-directory))
                              (y-or-n-p (format "Directory `%s' does not exist! Create it?" parent-directory)))
                     (make-directory parent-directory t)))))
#+end_src

Disable the creation of backup files which pollute the file system.
#+begin_src emacs-lisp
  (setq make-backup-files nil)
#+end_src

Make PDFs save where in the document it was last.
#+begin_src emacs-lisp
  (use-package saveplace-pdf-view
    :config
    (save-place-mode 1))
#+end_src

Don't show tooltips on hover; Aerospace on macOS tries to tile them and annoyingly resizes everything.
#+begin_src emacs-lisp
  (tooltip-mode -1)
#+end_src

Provide smooth scrolling.
#+begin_src emacs-lisp
  (use-package ultra-scroll
   :ensure (ultra-scroll :host github :repo "jdtsmith/ultra-scroll")
   :init
   (setq scroll-conservatively 101
     scroll-margin 0)
   :config
   (ultra-scroll-mode 1))
#+end_src

* Tools

** Navigation

Use =consult= for better search and navigation.
#+begin_src emacs-lisp
  (use-package consult
    :bind
    (
         ("C-c M-x" . consult-mode-command)
         ("C-c h" . consult-history)
         ("C-c k" . consult-kmacro)
         ("C-c m" . consult-man)
         ("C-c i" . consult-info)
         ([remap Info-search] . consult-info)

         ("C-x M-:" . consult-complex-command)
         ("C-x b" . consult-buffer)
         ("C-x 4 b" . consult-buffer-other-window)
         ("C-x 5 b" . consult-buffer-other-frame)
         ("C-x t b" . consult-buffer-other-tab)
         ("C-x r b" . consult-bookmark)
         ("C-x p b" . consult-project-buffer)

         ("M-#" . consult-register-load)
         ("M-'" . consult-register-store)
         ("C-M-#" . consult-register)

         ("M-y" . consult-yank-pop)

         ("M-g e" . consult-compile-error)
         ("M-g f" . consult-flymake)
         ("M-g g" . consult-goto-line)
         ("M-g M-g" . consult-goto-line)
         ("M-g o" . consult-outline)
         ("M-g m" . consult-mark)
         ("M-g k" . consult-global-mark)
         ("M-g i" . consult-imenu)
         ("M-g I" . consult-imenu-multi)

         ("M-s d" . consult-find)
         ("M-s c" . consult-locate)
         ("M-s g" . consult-grep)
         ("M-s G" . consult-git-grep)
         ("M-s r" . consult-ripgrep)
         ("M-s l" . consult-line)
         ("M-s L" . consult-line-multi)
         ("M-s k" . consult-keep-lines)
         ("M-s u" . consult-focus-lines)

         ("M-s e" . consult-isearch-history)
         :map isearch-mode-map
         ("M-e" . consult-isearch-history)
         ("M-s e" . consult-isearch-history)
         ("M-s l" . consult-line)
         ("M-s L" . consult-line-multi)

         :map minibuffer-local-map
         ("M-s" . consult-history)
         ("M-r" . consult-history))

    :hook
    (completion-list-mode . consult-preview-at-point-mode)

    :init
    (advice-add #'register-preview :override #'consult-register-window)
    (setq register-preview-delay 0.5)
    (setq xref-show-xrefs-function #'consult-xref
          xref-show-definitions-function #'consult-xref)
    (setq consult-man-args "/usr/bin/man -k")

    :config
    (consult-customize
     consult-theme :preview-key '(:debounce 0.2 any)
     consult-ripgrep consult-git-grep consult-grep consult-man
     consult-bookmark consult-recent-file consult-xref
     consult--source-bookmark consult--source-file-register
     consult--source-recent-file consult--source-project-recent-file
     :preview-key '(:debounce 0.4 any))
    (setq consult-narrow-key "<"))
#+end_src

Jump to definition with =dumb-jump=.
#+begin_src emacs-lisp
  (use-package dumb-jump
    :init
    (add-hook 'xref-backend-functions #'dumb-jump-xref-activate))
#+end_src

** Project Management

Configure and install =magit= as a =git= front end.
#+begin_src emacs-lisp
  (use-package transient)
  (use-package magit)
#+end_src

Better project management than =project.el= packaged with Emacs.
#+begin_src emacs-lisp
  (use-package rg)
  (use-package projectile
    :init
    (projectile-mode)
    (setq projectile-project-search-path '("~/projects"))
    :bind
    (:map projectile-mode-map ("C-c p" . projectile-command-map)))
#+end_src

** Shell

If I disable the default =eshell= prompt highlighting, the default =eshell-emit-prompt= function makes the prompt editable. Redefine the function after loading to not allow editing the prompt.
#+begin_src emacs-lisp
  ;; Overwrite a default function that makes the prompt editable for some reason
  (eval-after-load "em-prompt" '(defun eshell-emit-prompt ()
                                 "Emit a prompt if eshell is being used interactively."
                                 (when (boundp 'ansi-color-context-region)
                                   (setq ansi-color-context-region nil))
                                 (run-hooks 'eshell-before-prompt-hook)
                                 (if (not eshell-prompt-function)
                                     (set-marker eshell-last-output-end (point))
                                   (let ((prompt (funcall eshell-prompt-function)))
                                     (add-text-properties
                                      0 (length prompt)
                                      (if eshell-highlight-prompt
                                          '( read-only t
                                             field prompt
                                             font-lock-face eshell-prompt
                                             front-sticky (read-only field font-lock-face)
                                             rear-nonsticky (read-only field font-lock-face))
                                        '( read-only t
                                           field prompt
                                           front-sticky (read-only field font-lock-face)
                                           rear-nonsticky (read-only field font-lock-face)))
                                      prompt)
                                     (eshell-interactive-filter nil prompt)))
                                 (run-hooks 'eshell-after-prompt-hook)))
#+end_src

Define an =eshell= command to reinstall and update my dotfiles.
#+begin_src emacs-lisp
  (defun eshell/manage-configs (arg)
   "run the argument through make at the root of my dotfiles repository"
   (let ((dir (eshell/pwd)))
    (eshell/cd "~/.dotfiles")
    (compile (concat "make " arg))
    (eshell/cd dir)))
#+end_src

Define an =eshell= command to get the RSS link to a YouTube channel.
#+begin_src emacs-lisp
  (defun eshell/yt-2-rss (url)
   "convert a youtube channel link into an rss link"
   (if (not (libxml-available-p))
     (message "libxml is not available")
     (browse-url-emacs url t)
     (let* ((dom (libxml-parse-html-region))
            (rss (dom-elements dom 'title "RSS"))
            (href (dom-attr rss 'href)))
       (kill-buffer)
       href)))
#+end_src

Define functions for my =eshell= prompt. =jj/shorten-path-str= takes only the first character of all path components except the last two directories. =jj/curr-dir-git-branch= gets the current branch and git status and turns it into a string.
#+begin_src emacs-lisp
  (defun jj/shorten-path-str (path)
   (let* ((components (split-string (replace-regexp-in-string (getenv "HOME") "~" path) "/"))
          (head-items (butlast components 2))
          (shortened-head (mapcar (lambda (element)
                                    (if (= (length element) 0)
                                        ""
                                      (substring element 0 1)))
                                  head-items))
          (tail-items (last components 2))
          (new-components (append shortened-head tail-items)))
     (propertize (string-join new-components "/") 'font-lock-face '(:foreground "dark green"))))

  (defun jj/curr-dir-git-branch (path)
   (when (and (not (file-remote-p path))
              (eshell-search-path "git")
              (locate-dominating-file path ".git"))
     (let* ((git-branch (when (string-match "On branch \\(.*\\)$" (shell-command-to-string "git status"))
                          (match-string 1 (shell-command-to-string "git status"))))
            (git-status (s-trim (shell-command-to-string "git status")))
            (outofsync (if (string-match-p "use \"git push\" to publish your local commits" git-status)
                           " "
                         ""))
            (staged (if (string-match-p "Changes to be committed:" git-status)
                        " "
                      ""))
            (unstaged (if (string-match-p "Changes not staged for commit:" git-status)
                          " "
                        ""))
            (untracked (if (string-match-p "Untracked files:"git-status)
                           " "
                         "")))
        (concat (propertize (concat " " git-branch) 'font-lock-face '(:foreground "blue"))
                (propertize outofsync 'font-lock-face '(:foreground "dark green"))
                (propertize staged 'font-lock-face '(:foreground "orange"))
                (propertize unstaged 'font-lock-face '(:foreground "magenta"))
                (propertize untracked 'font-lock-face '(:foreground "dark red"))))))
#+end_src

Install and configure =eat= as a terminal emulator in Emacs with =eshell= as a shell.
#+begin_src emacs-lisp
  (use-package eat
    :init
    (setopt eat-kill-buffer-on-exit t)
    (eat-eshell-mode)

    (defun jj/eshell-quit-or-delete-char (arg)
      "Close the terminal if I hit C-d on an empty line"
      (interactive "p")
      (if (and (eolp) (looking-back eshell-prompt-regexp))
          (eshell-life-is-too-much)
        (delete-forward-char arg)))

    (setq eshell-highlight-prompt nil)
    (setq eshell-prompt-function (lambda ()
                                   (concat (jj/shorten-path-str (eshell/pwd))
                                           (jj/curr-dir-git-branch (eshell/pwd))
                                           (unless (eshell-exit-success-p)
                                             (format " [%d]" eshell-last-command-status))
                                           (if (= (file-user-uid) 0) " # " " $ "))))

    :config
    (setq eshell-visual-commands '())

    :hook
    (eat-mode . (lambda () (display-line-numbers-mode -1)))
    (eshell-mode . (lambda ()
                     (display-line-numbers-mode -1)
                     (eshell/alias "ll" "ls -alF $@*")
                     (eshell/alias "la" "ls -a $@*")
                     (eshell/alias "l" "ls -F $@*")
                     (eshell/alias "ff" "find-file $@*")
                     (eshell/alias "clr" "clear-scrollback")))
    :bind
    ("C-c v" . eshell)
    (:map eshell-mode-map ("C-d" . jj/eshell-quit-or-delete-char)))
#+end_src

** Completions

Provide a user interface for inline completions.
#+begin_src emacs-lisp
  (use-package corfu
    :custom
    (corfu-cycle t)
    (corfu-auto t)
    :init
    (global-corfu-mode))
#+end_src

Provide a user interface for mini-buffer completions.
#+begin_src emacs-lisp
  (use-package vertico
    :custom
    (vertico-cycle t)
    (vertico-mode 1))
#+end_src

Allow fuzzy search in =vertico= completions.
#+begin_src emacs-lisp
  (use-package orderless
    :custom
    (completion-styles '(orderless basic))
    (completion-category-overrides '((file (styles basic partial-completion)))))
#+end_src

Give descriptions of items in =vertico= buffer.
#+begin_src emacs-lisp
  (use-package marginalia
    :bind
    (:map minibuffer-local-map
          ("M-A" . marginalia-cycle))
    :init
    (marginalia-mode 1))
#+end_src

** Checking Correctness

Provide syntax checking.
#+begin_src emacs-lisp
  (use-package flycheck
    :config
    (add-hook 'after-init-hook #'global-flycheck-mode))
#+end_src

Provide spell checking.
#+begin_src emacs-lisp
  (require 'flyspell)
  (add-hook 'text-mode-hook #'flyspell-mode)
  (use-package flyspell-correct
    :after flyspell
    :bind
    (:map flyspell-mode-map ("C-;" . flyspell-correct-wrapper)))
#+end_src

** Miscellaneous

Configure a convenient startup profiler.
#+begin_src emacs-lisp
  (use-package esup
    :config
    (setq esup-depth 0))
#+end_src

Allow multiple cursors.
#+begin_src emacs-lisp
  (use-package multiple-cursors
    :bind
    ("C->" . mc/mark-next-like-this)
    ("C-<" . mc/unmark-next-like-this))
#+end_src

Display available key bindings when typing commands.
#+begin_src emacs-lisp
  (use-package which-key
    :ensure t
    :config
    (which-key-mode))
#+end_src

Install a better PDF viewer than =DocView=.
#+begin_src emacs-lisp
  (use-package pdf-tools
    :hook
    (doc-view-mode . (lambda () (pdf-tools-install))) ;; install on first pdf opened instead of startup
    (pdf-view-mode . (lambda () (display-line-numbers-mode -1)))
    :init
    (add-hook 'TeX-after-compilation-finished-functions #'TeX-revert-document-buffer)
    :config
    (setq TeX-view-program-selection '((output-pdf "PDF Tools"))
          TeX-view-program-list '(("PDF Tools" TeX-pdf-tools-sync-view))
          TeX-source-correlate-start-server t))
#+end_src

Provide a snippet management system.
#+begin_src emacs-lisp
  (use-package yasnippet
    :init
    (yas-global-mode 1)
    :bind
    ("C-c s" . yas-insert-snippet))
#+end_src

Provide a set of useful snippets.
#+begin_src emacs-lisp
  (use-package yasnippet-snippets)
#+end_src

Enable automatic code formatting.
#+begin_src emacs-lisp
  (use-package apheleia
    :init (apheleia-global-mode 1))
#+end_src

Provide an RSS reader with =elfeed=. Get the feed from an =.org= file.
#+begin_src emacs-lisp
  (use-package elfeed
    :bind
    ("C-c e f" . elfeed)
    ("C-c e u" . elfeed-update))
  (use-package elfeed-goodies
    :after
    elfeed
    :config
    (elfeed-goodies/setup))
  (use-package elfeed-org
    :config
    (elfeed-org)
    (setq rmh-elfeed-org-files (list "~/.config/emacs/feed.org")))
#+end_src

Install my pomodoro timer package.
#+begin_src emacs-lisp
  (use-package pomodoro-mode
    :ensure (pomodoro-mode :host github :repo "jjanzenn/pomodoro-mode"))
#+end_src

Provide a music player and configure scrobbling to =libre.fm=.
#+begin_src emacs-lisp
  (use-package emms
    :init
    (emms-all)
    (setq emms-player-list '(emms-player-mpv)
          emms-info-functions '(emms-info-native)
          emms-browser-covers #'emms-browser-cache-thumbnail-async
          emms-browser-thumbnail-small-size 64
          emms-browser-thumbnail-medium-size 128
          emms-browser-thumbnail-large-size 256)
    :hook
    (emms-browser-mode . (lambda ()
                           (if (not emms-librefm-scrobbler-session-id)
                            (emms-librefm-scrobbler-enable))))
    (emms-playlist-mode . (lambda ()
                            (if (not emms-librefm-scrobbler-session-id)
                             (emms-librefm-scrobbler-enable)))))
#+end_src

* Languages

** Org

Configure =org-mode=. I use =~/org= as my =org= directory and hide emphasis markers because it's much easier to read that way. I enable =org-crypt= to allow reading and writing encrypted =org= files. I also replace bullets in bulleted lists with nicer looking icons. I configure faces to default to variable-width font, but switching to monospace where it is necessary. Finally, I use =visual-fill-column= to make =org= files display with a relatively narrow window centred in the frame.
#+begin_src emacs-lisp
  (use-package org
    :hook
    (org-mode . (lambda ()
                  (variable-pitch-mode)
                  (display-line-numbers-mode -1)))
    :bind
    (
     ("C-c l" . org-store-link)
     ("C-c a" . org-agenda)
     ("C-c c" . org-capture))

    :config
    (org-crypt-use-before-save-magic)

    (setq org-directory "~/org"
          org-agenda-files (list org-directory)
          org-agenda-file-regexp "\\`[^.].*\\.org\\\(\\.gpg\\\)?\\'"
          org-todo-keywords '((sequence "TODO(t)" "PLANNING(p)" "IN-PROGRESS(i@/!)" "VERIFYING(v!)" "BLOCKED(b@)"  "|" "DONE(d!)" "WONT-DO(w@/!)"))
          org-todo-keyword-faces '(
                                   ("TODO" . (:foreground "GoldenRod" :weight bold))
                                   ("PLANNING" . (:foreground "DeepPink" :weight bold))
                                   ("IN-PROGRESS" . (:foreground "DarkCyan" :weight bold))
                                   ("VERIFYING" . (:foreground "DarkOrange" :weight bold))
                                   ("BLOCKED" . (:foreground "Red" :weight bold))
                                   ("DONE" . (:foreground "LimeGreen" :weight bold))
                                   ("OBE" . (:foreground "LimeGreen" :weight bold))
                                   ("WONT-DO" . (:foreground "LimeGreen" :weight bold)))
          org-log-done 'time
          org-hide-emphasis-markers t
          org-format-latex-options (plist-put org-format-latex-options :scale 2.0)
          org-return-follows-link t
          org-tags-exclude-from-inheritance '("crypt")
          org-crypt-key nil
          auto-save-default nil)
    (setq org-capture-templates
        '(
          ("n" "Note"
           entry (file+headline "~/org/notes.org.gpg" "Random Notes")
           "** %?"
           :empty-lines 0)
          ("g" "General To-Do"
           entry (file+headline "~/org/todos.org.gpg" "General Tasks")
           "* TODO [#B] %?\n:Created: %T\n "
           :empty-lines 0)
          ("d" "To-Do with Deadline"
           entry (file+headline "~/org/todos.org.gpg" "Time Dependent Tasks")
           "* TODO [#B] %?\n:Created: %T\n:Deadline: %^t\n"
           :empty-lines 0)))
    (font-lock-add-keywords 'org-mode
                            '(("^ *\\([-]\\) "
                               (0 (prog1 () (compose-region (match-beginning 1) (match-end 1) "•"))))))
    :custom-face
    (org-block ((t :font ,jj/mono-font)))
    (org-code ((t :font ,jj/mono-font (:inherit (shadow)))))
    (org-document-info-keyword ((t :font ,jj/mono-font (:inherit (shadow)))))
    (org-meta-line ((t :font ,jj/mono-font (:inherit (font-lock-comment-face)))))
    (org-verbatim ((t :font ,jj/mono-font (:inherit (shadow)))))
    (org-table ((t :font ,jj/mono-font (:inherit (shadow)))))
    (org-document-title ((t (:inherit title :height 2.0 :underline nil))))
    (org-level-1 ((t (:inherit outline-1 :weight bold :height 1.75))))
    (org-level-2 ((t (:inherit outline-2 :weight bold :height 1.5))))
    (org-level-3 ((t (:inherit outline-3 :weight bold :height 1.25))))
    (org-level-4 ((t (:inherit outline-4 :weight bold :height 1.1))))
    (org-level-5 ((t (:inherit outline-5 :height 1.1))))
    (org-level-6 ((t (:inherit outline-6)))))
#+end_src

Highlight comment tags like =TODO= and whatnot.
#+begin_src emacs-lisp
  (use-package comment-tags
    :init
    (setq comment-tags-keyword-faces
          `(("TODO" . ,(list :weight 'bold :foreground "#28ABE3"))
            ("FIXME" . ,(list :weight 'bold :foreground "#DB3340"))
            ("BUG" . ,(list :weight 'bold :foreground "#DB3340"))
            ("HACK" . ,(list :weight 'bold :foreground "#E8B71A"))
            ("KLUDGE" . ,(list :weight 'bold :foreground "#E8B71A"))
            ("XXX" . ,(list :weight 'bold :foreground "#F7EAC8"))
            ("INFO" . ,(list :weight 'bold :foreground "#F7EAC8"))
            ("DONE" . ,(list :weight 'bold :foreground "#1FDA9A"))))
    (setq comment-tags-comment-start-only t
          comment-tags-require-colon t
          comment-tags-case-sensitive t
          comment-tags-show-faces t
          comment-tags-lighter t)
    :hook
    (prog-mode . comment-tags-mode))
#+end_src

** CMake

Install =cmake-mode=.
#+begin_src emacs-lisp
  (use-package cmake-mode)
#+end_src

** Go

Install =go-mode= and tools for =go= source code. Namely, =go-eldoc= gets documentation for =go= variables, functions, and arguments, =go-gen-tests= automatically generates tests for =go= code, and =go-guru= helps with refactoring =go= code.
#+begin_src emacs-lisp
  (use-package go-mode)
  (use-package go-eldoc
    :hook
    (go-mode . go-eldoc-setup))
  (use-package go-gen-test)
  (use-package go-guru
    :hook
    (go-mode . go-guru-hl-identifier-mode))
#+end_src

** LaTeX

Install tools for LaTeX. Namely, =auctex= for better integration with Emacs and =cdlatex= for environment and macro insertion.
#+begin_src emacs-lisp
  (use-package auctex
    :hook
    (LaTeX-mode . (lambda () (put 'LaTeX-mode 'eglot-language-id "latex"))))
  (use-package cdlatex
    :hook
    (LaTeX-mode . turn-on-cdlatex))
#+end_src

** Lisp

Install tools for Emacs Lisp. Namely =parinfer-rust-mode= which handles parentheses nicely in Emacs Lisp.
#+begin_src emacs-lisp :tangle yes
  (use-package parinfer-rust-mode
    :hook
    (emacs-lisp-mode . parinfer-rust-mode)
    :init
    (setq parinfer-rust-auto-download t))
#+end_src

** Lua

Install =lua-mode=.
#+begin_src emacs-lisp
  (use-package lua-mode)
#+end_src

** Markdown

Configure how Markdown is displayed (default to variable-width font and use monospace where necessary) and installs =markdown-mode=.
#+begin_src emacs-lisp
  (use-package markdown-mode
    :hook
    (markdown-mode . (lambda ()
                       (variable-pitch-mode)
                       (display-line-numbers-mode -1)
                       (eglot-ensure)))
    :config
    (setq markdown-hide-markup t)
    :custom-face
    (markdown-header-face ((t :font ,jj/var-font :weight bold)))
    (markdown-header-face-1 ((t (:inherit markdown-header-face :height 2.0))))
    (markdown-header-face-2 ((t (:inherit markdown-header-face :height 1.75))))
    (markdown-header-face-3 ((t (:inherit markdown-header-face :height 1.5))))
    (markdown-header-face-4 ((t (:inherit markdown-header-face :height 1.25))))
    (markdown-header-face-5 ((t (:inherit markdown-header-face :height 1.1))))
    (markdown-header-face-6 ((t (:inherit markdown-header-face :height 1.1))))
    (markdown-blockquote-face ((t :font ,jj/var-font)))
    (markdown-code-face ((t :font ,jj/mono-font)))
    (markdown-html-attr-name-face ((t :font ,jj/mono-font)))
    (markdown-html-attr-value-face ((t :font ,jj/mono-font)))
    (markdown-html-entity-face ((t :font ,jj/mono-font)))
    (markdown-html-tag-delimiter-face ((t :font ,jj/mono-font)))
    (markdown-html-tag-name-face ((t :font ,jj/mono-font)))
    (markdown-html-comment-face ((t :font ,jj/mono-font)))
    (markdown-header-delimiter-face ((t :font ,jj/mono-font)))
    (markdown-hr-face ((t :font ,jj/mono-font)))
    (markdown-inline-code-face ((t :font ,jj/mono-font)))
    (markdown-language-info-face ((t :font ,jj/mono-font)))
    (markdown-language-keyword-face ((t :font ,jj/mono-font)))
    (markdown-link-face ((t :font ,jj/mono-font)))
    (markdown-markup-face ((t :font ,jj/mono-font)))
    (markdown-math-face ((t :font ,jj/mono-font)))
    (markdown-metadata-key-face ((t :font ,jj/mono-font)))
    (markdown-metadata-value-face ((t :font ,jj/mono-font)))
    (markdown-missing-link-face ((t :font ,jj/mono-font)))
    (markdown-plain-url-face ((t :font ,jj/mono-font)))
    (markdown-reference-face ((t :font ,jj/mono-font)))
    (markdown-table-face ((t :font ,jj/mono-font)))
    (markdown-url-face ((t :font ,jj/mono-font))))
#+end_src

** Nix

Install =nix-mode=.
#+begin_src emacs-lisp
  (use-package nix-mode
    :mode
    "\\.nix\\'")
#+end_src

** Python

Use =pet= to handle Python virtual environments.
#+begin_src emacs-lisp
  (use-package pet
    :config
    (add-hook 'python-base-mode-hook 'pet-mode -10))
#+end_src

** YAML

Install =yaml-mode=.
#+begin_src emacs-lisp :tangle yes
  (use-package yaml-mode)
#+end_src

** Zig

Install =zig-mode=.
#+begin_src emacs-lisp
  (use-package zig-mode)
#+end_src

** Eglot Setup

Set up =eglot= to run on languages that have been configured.
#+begin_src emacs-lisp
  (global-set-key (kbd "C-c r") 'eglot-rename)
  (use-package tree-sitter)
  (use-package tree-sitter-langs)
  (dolist (lang-hook '(sh-mode-hook
                       c-mode-hook
                       c++-mode-hook
                       cc-mode-hook
                       cmake-mode-hook
                       html-mode-hook
                       css-mode-hook
                       js-mode-hook
                       python-mode-hook
                       go-mode-hook
                       lua-mode-hook
                       tex-mode-hook
                       LaTeX-mode-hook
                       yaml-mode-hook
                       nix-mode-hook
                       zig-mode-hook))
    (add-hook lang-hook (lambda ()
                          (eglot-ensure)
                          (tree-sitter-mode 1)
                          (tree-sitter-hl-mode 1))))
#+end_src