#+TITLE: Emacs Configuration
#+AUTHOR: Preston Pan
#+DESCRIPTION: my personal emacs configuration for nixOS
#+html_head: <link rel="stylesheet" type="text/css" href="../style.css" />

* Introduction
This is my Vanilla Emacs configuration, made to work with my NixOS configuration. For that
reason, you will not see :ensure t inside any use-package declaration, for emacs packages
are all compiled natively and reproducibly on the NixOS side. This configuration uses the
emacs-lisp language only to configure variables for said packages, for the most part.
** UI Elements
This section contains important UI elements and starting customization variables to make
emacs work in a semi-sane way and make it not look ugly:
#+begin_src emacs-lisp
    (pixel-scroll-precision-mode 1)
    (setq scroll-conservatively 101)
    (display-battery-mode 1)
    (setq display-time-24hr-format t)
    (display-time-mode 1)
    (menu-bar-mode -1)
    (scroll-bar-mode -1)
    (tool-bar-mode -1)
    (load-theme 'catppuccin :no-confirm)
    (setq display-line-numbers-type 'relative)
    (add-hook 'prog-mode-hook #'display-line-numbers-mode)
    (add-hook 'org-mode-hook #'display-line-numbers-mode)
    (setq org-confirm-babel-evaluate nil)
    (set-face-attribute 'default nil :height 120)
    (setq use-short-answers t)
    (setq make-backup-files nil)
    (setq org-export-with-broken-links t)
    (setq org-src-fontify-natively t)
    ;; (setq org-highlight-latex-and-related '(latex script entities))
    (setq warning-minimum-level :emergency)
    (add-hook 'text-mode-hook 'visual-line-mode)
    (and window-system (server-start))
    (setq debug-ignored-errors
      (cons 'remote-file-error debug-ignored-errors))
    (set-face-attribute 'default nil :font "Iosevka Nerd Font" :height 140)
    (setq org-preview-latex-image-directory "/home/preston/.cache/ltximg/")
    (add-hook 'prog-mode-hook
    (lambda ()
     (setq prettify-symbols-alist
	'(("lambda" . ?λ)
	  ("->"     . ?→)
	  ("map"    . ?↦)
	  ("/="     . ?≠)
	  ("!="     . ?≠)
	  ("=="     . ?≡)
	  ("<="     . ?≤)
	  (">="     . ?≥)
	  ("&&"     . ?∧)
	  ("||"     . ?∨)
	  ("sqrt"   . ?√)
	  ("..."    . ?…)))
      (prettify-symbols-mode)))

      (add-hook 'org-mode-hook (lambda ()
       (setq prettify-symbols-alist
       '(("#+begin_src" . ?)
	("#+BEGIN_SRC" . ?)
	("#+end_src" . ?)
	("#+END_SRC" . ?)
	("#+begin_example" . ?)
	("#+BEGIN_EXAMPLE" . ?)
	("#+end_example" . ?)
	("#+END_EXAMPLE" . ?)
	("#+header:" . ?)
	("#+HEADER:" . ?)
	("#+name:" . ?﮸)
	("#+NAME:" . ?﮸)
	("#+results:" . ?)
	("#+RESULTS:" . ?)
	("#+call:" . ?)
	("#+CALL:" . ?)
	(":PROPERTIES:" . ?)
	(":properties:" . ?)
	("lambda" . ?λ)
	    ("->"     . ?→)
	    ("map"    . ?↦)
	    ("/="     . ?≠)
	    ("!="     . ?≠)
	    ("=="     . ?≡)
	    ("<="     . ?≤)
	    (">="     . ?≥)
	    ("&&"     . ?∧)
	    ("||"     . ?∨)
	    ("sqrt"   . ?√)
	    ("..."    . ?…))))
     (prettify-symbols-mode))
  (global-prettify-symbols-mode 1)
#+end_src
* Transparency
My NixOS configuration uses Hyprland to make things transparent:
#+begin_src emacs-lisp
  (set-frame-parameter nil 'alpha-background 90)
  (add-to-list 'default-frame-alist '(alpha-background . 90))
#+end_src
* Scrolling
Make emacs scroll in a sane way:
#+begin_src emacs-lisp
  (setq mouse-wheel-scroll-amount '(1 ((shift) . 1)))
  (setq mouse-wheel-progressive-speed nil)
  (setq mouse-wheel-follow-mouse 't)
  (setq scroll-step 1)
#+end_src
* Agenda
Configure org agenda variables:
#+begin_src emacs-lisp
  (require 'org-habit)
  (setq org-agenda-files (list "~/org/agenda.org"
			       "~/org/notes.org"))
  (setq org-default-notes-file (concat org-directory "/notes.org"))
  (setq org-habit-preceding-days 1)
#+end_src
* Publishing
This is the configuration required to publish my website:
#+begin_src emacs-lisp
  (require 'ox-publish)
  (setq org-publish-project-alist
	'(("website-org"
	   :base-directory "~/org/website"
	   :base-extension "org"
	   :publishing-directory "~/website_html"
	   :recursive t
	   :publishing-function org-html-publish-to-html
	   :headline-levels 4
	   :html-preamble t
	   :html-preamble-format (("en" "<p class=\"preamble\"><a href=\"/index.html\">home</a> | <a href=\"./index.html\">section main page</a></p><hr>")))
	  ("website-static"
	   :base-directory "~/org/website"
	   :base-extension "css\\|js\\|png\\|jpg\\|gif\\|pdf\\|mp3\\|ogg\\|swf\\|ico"
	   :publishing-directory "~/website_html/"
	   :recursive t
	   :publishing-function org-publish-attachment)
	  ("website" :auto-sitemap t :components ("website-org" "website-static"))))
  ;; (setq org-export-html-postamble-format '(("en" "<p class=\"preamble\"><a href=\"../index.html\">previous page</a> | <a href=\"/index.html\">home</a></p>")))
  (setq org-html-postamble "Copyright © 2024 Preston Pan")
#+end_src
* Autopair
Use electric-pair to automatically complete pairs of things. We need to change
what electric-pair does based on the mode.
#+begin_src emacs-lisp
  (defun electric-pair ()
    "If at end of line, insert character pair without surrounding spaces.
  Otherwise, just insert the typed character."
    (interactive)
    (if (eolp) (let (parens-require-spaces) (insert-pair)) (self-insert-command 1)))

  (add-hook 'org-mode-hook
	      (lambda ()
		(define-key org-mode-map "\"" 'electric-pair)
		(define-key org-mode-map "(" 'electric-pair)
		(define-key org-mode-map "[" 'electric-pair)
		(define-key org-mode-map "{" 'electric-pair)))
  (add-hook 'prog-mode-hook
	    (lambda ()
		(define-key prog-mode-map "\"" 'electric-pair)
		(define-key prog-mode-map "(" 'electric-pair)
		(define-key prog-mode-map "[" 'electric-pair)
		(define-key prog-mode-map "{" 'electric-pair)))
#+end_src
* Lyrics
#+begin_src emacs-lisp
  (use-package lyrics-fetcher
    :after (emms)
    :config
    (setq lyrics-fetcher-genius-access-token
      (password-store-get "genius_api"))
    (lyrics-fetcher-use-backend 'genius))
#+end_src
* Fragtog
#+begin_src emacs-lisp
  (use-package org-fragtog :hook (org-mode . org-fragtog-mode))
#+end_src
* Snippets
#+begin_src emacs-lisp
  (use-package yasnippet
    :config
    (add-to-list 'yas-snippet-dirs "~/org/website/yasnippet/")
    (yas-global-mode 1))
  (add-hook 'org-mode-hook
	  (lambda () (yas-minor-mode)
	      (yas-activate-extra-mode 'latex-mode)))
#+end_src
* Completion
Company-mode! We need this to do autocomplete stuff.
#+begin_src emacs-lisp
    (eval-after-load "company" '(add-to-list 'company-backends '(company-ispell company-capf company-yasnippet company-files))) (add-hook 'after-init-hook 'global-company-mode)
    (use-package ispell
      :init
      (setq ispell-program-name "aspell")
      (setq ispell-silently-savep t)
      (setq ispell-dictionary "en")
      (setq ispell-alternate-dictionary "/home/preston/.local/share/my.dict"))
#+end_src
* Spelling
#+begin_src emacs-lisp
(dolist (hook '(text-mode-hook))
  (add-hook hook (lambda () (flyspell-mode 1))))
#+end_src
* Org Babel
For some reason, org-babel doesn't load these languages by default:
#+begin_src emacs-lisp
  (org-babel-do-load-languages 'org-babel-load-languages
      '(
	  (shell . t)
	  (python . t)
	  (latex . t)
      )
  )
#+end_src
* Packages
First, some small configurations and some evil-mode initilaization because I like vim keybindings:
#+begin_src emacs-lisp
  (require 'org-tempo)
  (use-package evil
    :init
    (setq evil-want-keybinding nil)
    :config
    (evil-mode 1)
    (evil-set-undo-system 'undo-redo))

  (use-package evil-collection
    :init
    (setq evil-want-keybinding nil)
    :config
    (evil-collection-init))
  (with-eval-after-load 'evil-maps
  (define-key evil-motion-state-map (kbd "SPC") nil)
  (define-key evil-motion-state-map (kbd "RET") nil)
  (define-key evil-motion-state-map (kbd "TAB") nil))

  (use-package evil-commentary
    :config
    (evil-commentary-mode))

  (use-package evil-org
    :after org
    :hook (org-mode . (lambda () evil-org-mode))
    :config
    (require 'evil-org-agenda)
    (evil-org-agenda-set-keys))

  (use-package which-key
    :config
    (which-key-mode))

  (use-package page-break-lines
    :init
    (page-break-lines-mode))
  (evil-set-initial-state 'pdf-view-mode 'normal)
#+end_src
** Journal
I use org-journal to journal about my life, and it's a part of my website:
#+begin_src emacs-lisp
  (use-package org-journal
    :after (org)
    :init
      (setq org-journal-dir "~/org/website/journal/")
      (setq org-journal-date-format "%A, %d %B %Y")

      (defun org-journal-file-header-func (time)
      "Custom function to create journal header."
      (concat
	(pcase org-journal-file-type
	  (`daily "#+TITLE: Daily Journal\n#+STARTUP: showeverything\n#+DESCRIPTION: My daily journal entry\n#+AUTHOR: Preston Pan\n#+HTML_HEAD: <link rel=\"stylesheet\" type=\"text/css\" href=\"../style.css\" />\n#+html_head: <script src=\"https://polyfill.io/v3/polyfill.min.js?features=es6\"></script>\n#+html_head: <script id=\"MathJax-script\" async src=\"https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js\"></script>\n#+options: broken-links:t")
	  (`weekly "#+TITLE: Weekly Journal\n#+STARTUP: folded")
	  (`monthly "#+TITLE: Monthly Journal\n#+STARTUP: folded")
	  (`yearly "#+TITLE: Yearly Journal\n#+STARTUP: folded"))))

    (setq org-journal-file-header 'org-journal-file-header-func)
    (setq org-journal-file-format "%Y%m%d.org")
    (setq org-journal-enable-agenda-integration t)
  )
#+end_src
** Doom Modeline
The default modeline is ugly.
#+begin_src emacs-lisp
  (use-package doom-modeline
    :config
    (doom-modeline-mode 1))
#+end_src
** Grammar
I want to write good!
#+begin_src emacs-lisp
  (use-package writegood-mode)

(dolist (hook '(text-mode-hook))
  (add-hook hook (lambda () (writegood-mode))))
#+end_src
** Make Org Look Better
Org superstar adds those nice looking utf-8 bullets:
#+begin_src emacs-lisp
  (use-package org-superstar
    :after (org)
    :config
    (add-hook 'org-mode-hook (lambda () (org-superstar-mode 1))))
#+end_src
** LSP
We set up eglot, the LSP manager for emacs, now built in:
#+begin_src emacs-lisp
  (use-package eglot 
    :config
    (add-hook 'prog-mode-hook 'eglot-ensure))
#+end_src
** Projectile
Manages projects and shit.
#+begin_src emacs-lisp
  (use-package projectile
    :init
    (setq projectile-project-search-path '("~/org" "~/src"))
    :config
    (projectile-mode +1))
#+end_src
** Dashboard
We want our emacs initialization to be pretty and display useful things.
#+begin_src emacs-lisp
  (use-package dashboard
    :after (projectile)
    :init
    (setq dashboard-banner-logo-title "Welcome, Commander!")
    (setq dashboard-icon-type 'nerd-icons)
    (setq dashboard-vertically-center-content t)
    (setq dashboard-set-init-info t)
    (setq dashboard-week-agenda t)
    (setq dashboard-items '((recents   . 5)
			(bookmarks . 5)
			(projects  . 5)
			(agenda    . 5)
			(registers . 5)))
    :config
    (dashboard-setup-startup-hook))
#+end_src
** Ivy
Ivy is a pretty cool general program for displaying stuff:
#+begin_src emacs-lisp
    (use-package counsel)
    (use-package ivy
      :init
      (setq ivy-use-virtual-buffers t)
      (setq enable-recursive-minibuffers t)
      ;; enable this if you want `swiper' to use it
      ;; (setq search-default-mode #'char-fold-to-regexp)
      (global-set-key "\C-s" 'swiper)
      (global-set-key (kbd "C-c C-r") 'ivy-resume)
      (global-set-key (kbd "<f6>") 'ivy-resume)
      (global-set-key (kbd "M-x") 'counsel-M-x)
      (global-set-key (kbd "C-x C-f") 'counsel-find-file)
      (global-set-key (kbd "<f1> f") 'counsel-describe-function)
      (global-set-key (kbd "<f1> v") 'counsel-describe-variable)
      (global-set-key (kbd "<f1> o") 'counsel-describe-symbol)
      (global-set-key (kbd "<f1> l") 'counsel-find-library)
      (global-set-key (kbd "<f2> i") 'counsel-info-lookup-symbol)
      (global-set-key (kbd "<f2> u") 'counsel-unicode-char)
      (global-set-key (kbd "C-c g") 'counsel-git)
      (global-set-key (kbd "C-c j") 'counsel-git-grep)
      (global-set-key (kbd "C-c k") 'counsel-ag)
      (global-set-key (kbd "C-x l") 'counsel-locate)
      (global-set-key (kbd "C-S-o") 'counsel-rhythmbox)
      :config
      (ivy-mode))
    (define-key ivy-minibuffer-map (kbd "C-j") 'ivy-immediate-done)
#+end_src
** Magit
#+begin_src emacs-lisp
(use-package magit)
#+end_src
** IRC
#+begin_src emacs-lisp
  (setq
   erc-nick "prestonpan"
   erc-user-full-name "Preston Pan")

  (defun prestonpan ()
    (interactive)
    (erc-tls :server "nullring.xyz"
	     :port   "6697"))
#+end_src
** Matrix
#+begin_src emacs-lisp
  (defun matrix-org ()
    (interactive)
    (ement-connect :uri-prefix "http://localhost:8009"))
#+end_src
** LLMs
#+begin_src emacs-lisp
  (use-package gptel
   :init
   (setq gptel-default-mode 'org-mode)
   (setq-default
   gptel-model "zephyr:latest"
   gptel-backend (gptel-make-ollama "Ollama"
		   :host "localhost:11434"
		   :stream t
		   :models '("zephyr:latest"))))
#+end_src
** Keybindings
#+begin_src emacs-lisp
  (use-package general
    :config
    (general-create-definer leader-key
      :prefix "SPC")
    (leader-key 'normal
      "o a" '(org-agenda :wk "Open agenda")
      "o c" '(org-capture :wk "Capture")
      "n j j" '(org-journal-new-entry :wk "Make new journal entry")
      "n r f" '(org-roam-node-find :wk "Find roam node")
      "n r i" '(org-roam-node-insert :wk "Insert roam node")
      "n r a" '(org-roam-alias-add :wk "Add alias to org roam node")
      "n r g" '(org-roam-graph :wk "Graph roam database")
      "r s s" '(elfeed :wk "rss feed")
      "." '(counsel-find-file :wk "find file")
      "g /" '(magit-dispatch :wk "git commands")
      "g P" '(magit-push :wk "git push")
      "g c" '(magit-commit :wk "git commit")
      "g p" '(magit-pull :wk "Pull from git")
      "g s" '(magit-status :wk "Change status of files")
      "o t" '(vterm :wk "Terminal")
      "o e" '(eshell :wk "Elisp Interpreter")
      "o m" '(mu4e :wk "Email")
      "e w w" '(eww :wk "web browser")
      "e c c" '(ellama-chat :wk "Chat with Ollama")
      "e a b" '(ellama-ask-about :wk "Ask Ollama")
      "e s" '(ellama-summarize :wk "Summarize text with Ollama")
      "e c r" '(ellama-code-review :wk "Review code with Ollama")
      "e c C" '(ellama-code-complete :wk "Complete code with Ollama")
      "e c a" '(ellama-code-add :wk "Add code with Ollama")
      "e c e" '(ellama-code-edit :wk "Edit code with Ollama")
      "e w i" '(ellama-improve-wording :wk "Improve wording with Ollama")
      "e g i" '(ellama-improve-grammar :wk "Improve grammar with Ollama")
      "g s" '(gptel-send :wk "Send to Ollama")
      "g e" '(gptel :wk "Ollama interface")
      "p w" '(ivy-pass :wk "Password manager interface")
      "m P p" '(org-publish :wk "Publish website components")
      "s e" '(sudo-edit :wk "Edit file with sudo")
      "m m" '(emms :wk "Music player")
      "m l" '(lyrics-fetcher-show-lyrics :wk "Music lyrics")
      "o p" '(treemacs :wk "Project Drawer")
      "o P" '(treemacs-projectile :wk "Import Projectile project to treemacs")
      "f f" '(eglot-format :wk "Format code buffer")
      "i c" '(prestonpan :wk "Connect to my IRC server")
      "h m" '(woman :wk "Manual")
      "h i" '(info :wk "Info")
      "s m" '(proced :wk "System Manager")
      "l p" '(list-processes :wk "List Emacs Processes")
      "m I" '(org-id-get-create :wk "Make org id")
      "y n s" '(yas-new-snippet :wk "Create new snippet")
      "u w" '((lambda () (interactive) (shell-command "rsync -azvP ~/website_html/ root@nullring.xyz:/usr/share/nginx/ret2pop/")) :wk "rsync website update")
      "h r r" '(lambda () (interactive) (org-babel-load-file (expand-file-name "~/org/website/config/emacs.org")))
      ))
#+end_src
** RSS Feed
I use really simple syndication (RSS) in order to read news. As a result, I use
elfeed to fetch feeds found on my website:
#+begin_src emacs-lisp
  (use-package elfeed
    :init
    (add-hook 'elfeed-search-mode-hook #'elfeed-update)
    (setq elfeed-search-filter "@1-month-ago +unread"))
  (use-package elfeed-org
    :init
    (setq rmh-elfeed-org-files '("~/org/website/config/elfeed.org"))
    :config
    (elfeed-org))
#+end_src
** Project Drawer
#+begin_src emacs-lisp
  (use-package treemacs)
  (use-package treemacs-evil
    :after (treemacs evil))
  (use-package treemacs-projectile
    :after (treemacs projectile))
  (use-package treemacs-magit
    :after (treemacs magit))
#+end_src
** Eww
Used only for the purpose of viewing RSS feed items in emacs if I can, only resorting
to Chromium if I have to:
#+begin_src emacs-lisp
(setq search-engines
      '(
        (("google" "g") "https://google.com/search?q=%s")
        (("duckduckgo" "d" "ddg") "https://duckduckgo.com/?q=%s")
        (("rfc" "r") "https://www.rfc-editor.org/rfc/rfc%s.txt")
        (("rfc-kw" "rk") "https://www.rfc-editor.org/search/rfc_search_detail.php?title=%s")))

(setq search-engine-default "google")
(setq eww-search-prefix "https://google.com/search?q=")
(setq browse-url-secondary-browser-function 'browse-url-generic browse-url-generic-program "chromium")
(setq browse-url-browser-function 'eww-browse-url)
(add-hook 'eww-mode-hook
          (lambda () (local-set-key (kbd "y Y") #'eww-copy-page-url)))
#+end_src
** Org Roam
For all my mathematics and programming notes:
#+begin_src emacs-lisp
    (use-package org-roam
      :init
      (setq org-roam-db-update-on-save t)
      (setq org-roam-graph-viewer "chromium")
      (setq org-roam-directory (file-truename "~/org/website/mindmap"))
      (setq org-roam-capture-templates '(("d" "default" plain "%?"
      :target (file+head "${title}.org"
	   "#+title: ${title}\n#+author: Preston Pan\n#+html_head: <link rel=\"stylesheet\" type=\"text/css\" href=\"../style.css\" />\n#+html_head: <script src=\"https://polyfill.io/v3/polyfill.min.js?features=es6\"></script>\n#+html_head: <script id=\"MathJax-script\" async src=\"https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js\"></script>\n#+options: broken-links:t")
	:unnarrowed t)))
      :config
      (org-roam-db-autosync-mode))

  (use-package org-roam-ui
      :after org-roam
      :hook (after-init . org-roam-ui-mode)
      :config
      (setq org-roam-ui-sync-theme t
	    org-roam-ui-follow t
	    org-roam-ui-update-on-save t
	    org-roam-ui-open-on-start t))
#+end_src

** Pinentry
Set up pinentry so that I can use emacs as my pinentry frontend:
#+begin_src emacs-lisp
  (use-package pinentry
    :init (setq epa-pinentry-mode `loopback)
    :config (pinentry-start))
#+end_src
** LaTeX
Make LaTeX a litle better:
#+begin_src emacs-lisp
  (setq TeX-PDF-mode t)
  (setq org-format-latex-options (plist-put org-format-latex-options :scale 1.5))
  (setq org-return-follows-link t)
  ;; (use-package latex-preview-pane
  ;;   :config
  ;;   (latex-preview-pane-enable))
#+end_src
** Email
Email in emacs can be done with Mu4e.
#+begin_src emacs-lisp
      ;; SMTP settings:
    (setq user-mail-address "preston@nullring.xyz")
    (setq user-full-name "Preston Pan")
    (setq sendmail-program "msmtp"
	send-mail-function 'smtpmail-send-it
	message-sendmail-f-is-evil t
	message-sendmail-extra-arguments '("--read-envelope-from")
	message-send-mail-function 'message-send-mail-with-sendmail)

    (require 'smtpmail)
    (use-package mu4e
      :init
      (setq mu4e-drafts-folder "/Drafts")
      (setq mu4e-sent-folder   "/Sent")
      (setq mu4e-trash-folder  "/Trash")
      (setq mu4e-attachment-dir  "~/Downloads")
      (setq mu4e-view-show-addresses 't)
      (setq mu4e-confirm-quit nil)


      (setq message-kill-buffer-on-exit t)
      (setq mu4e-compose-dont-reply-to-self t)
      (setq mu4e-change-filenames-when-moving t)
      (setq mu4e-get-mail-command "mbsync prestonpan")
      (setq mu4e-compose-reply-ignore-address '("no-?reply" "ret2pop@gmail.com"))
      (setq mu4e-html2text-command "w3m -T text/html" ; how to hanfle html-formatted emails
	    mu4e-update-interval 300                  ; seconds between each mail retrieval
	    mu4e-headers-auto-update t                ; avoid to type `g' to update
	    mu4e-view-show-images t                   ; show images in the view buffer
	    mu4e-compose-signature-auto-include nil   ; I don't want a message signature
	    mu4e-use-fancy-chars t))
#+end_src
** Password Manager
I use ~pass~ in order to manage my passwords on linux, and this is an ivy frontend for it:
#+begin_src emacs-lisp
(use-package ivy-pass)
#+end_src
** Music
Set up emms in order to play music from my music directory:
#+begin_src emacs-lisp
  (use-package emms
    :init
    (emms-all)
    (setq emms-source-file-default-directory (expand-file-name "~/music/"))
    (setq emms-player-mpd-music-directory (expand-file-name "~/music/"))
    (setq emms-player-mpd-server-name "localhost")
    (setq emms-player-mpd-server-port "6600")
    (setq emms-player-list '(emms-player-mpd))
    (add-to-list 'emms-info-functions 'emms-info-mpd)
    (add-to-list 'emms-player-list 'emms-player-mpd)
  :config
    (emms-player-mpd-connect))
#+end_src
** Stem
My own programming language.
#+begin_src emacs-lisp
  (use-package stem-mode)
  (add-to-list 'auto-mode-alist '("\\.stem\\'" . stem-mode))
#+end_src
** Server
So that emacsclient can connect.
#+begin_src emacs-lisp
(server-start)
#+end_src