#+TITLE:Emacs config
#+AUTHOR: Crazazy
#+PROPERTY: header-args :tangle yes :noweb yes :results silent
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#+OPTIONS: ^:nil p:t

Welp, here it goes. This is a literal config for my emacs setup
I will prbably copy-paste what I have in my literal config, and provide small, fun explanations along the way
For now, prepare this to be not the best documented literal config you've seen.
Also, if you just stumbled accross this at random, there is an easy tangle button at [[file:readme.org][readme.org]]
* Before we start lisping
  This emacs config's dependencies are mostly managed by [[https://nixos.org][nix]], therefore we have to make a nix file before we
  do any emacs configuring by ourselves
  We also add webkitgtk support for (eventual) web browsing support
  #+begin_src nix :tangle emacs.nix
    let
      sources = import ./nix/sources.nix;
      packageOverlay = final: old: {
        emacs = old.emacs.override {
          withXwidgets = true;
        };
        emacsWithPackages = final.emacs.pkgs.withPackages;
      };
    in
    import sources.emacs {
      pkgs = import <nixpkgs> { overlays = [ packageOverlay ]; };
      configDir = ./emacsconfig;
    }
  #+end_src
* Emacs configuring
  Now the real configuring begins!
  for some backwards compat purposes I have decided to but different config subjects into different files
  This won't matter too much as the nix framework is expecting multiple files anyway!
** The bases
   This is only better-defaults. It comes with ido-mode and some other defaults that I forgot to set in my
   init file that I stole from [[https://github.com/editor-bootstrap/emacs-bootstrap][emacs-bootstrap]] months ago
   #+begin_src emacs-lisp :mkdirp yes :tangle emacsconfig/base.el
     (use-package better-defaults)
   #+end_src
** Generally nice emacs tools
*** Magit
    Simple. Nice. default config. (almost)
    #+begin_src emacs-lisp :tangle emacsconfig/extras.el
      (use-package magit
        :defer t
        :config
        (magit-add-section-hook 'magit-status-sections-hook
                                'magit-insert-modules
                                'magit-insert-stashes
                                'append)
        :bind
        ("C-x g" . magit-status))
      (use-package forge
        :after magit)
    #+end_src
*** IRC
    I use IRC in emacs, with ERC. There is even a small macro so that I can easily join new servers
    with my preferred nickname
    #+begin_src emacs-lisp :tangle emacsconfig/extras.el
      (use-package erc
        :custom
        (erc-server-reconnect-attempts 10)
        (erc-nick "crazazy")
        :config
        (defmacro irc-quickjoin (servername url &optional nick)
          "create a function to quickly join a server. Servers can be joined with M-x SERVERNAME-irc"
          `(defun ,(intern (concat (symbol-name servername) "-irc")) (password)
             (interactive (list (password-read "Password: ")))
             (erc-tls :server ,url
                      :nick ,(if nick
                                 nick
                               "crazazy")
                      :port 6697
                      :password password)))

        (irc-quickjoin tilde "eu.tilde.chat")
        (irc-quickjoin libera "irc.libera.chat"))
    #+end_src
*** Dashboard
    Gives me access to the most recent files I edited, and some other stuff that I don't really care about
    #+begin_src emacs-lisp :tangle emacsconfig/extras.el
      (use-package dashboard
        :config (dashboard-setup-startup-hook))
    #+end_src
*** Elfeed
    I don't use elfeed in emacs that much anymore, as I have switched to [[https://www.seamonkey-project.org/][seamonkey]] for my RSS needs.
    Here is my old config anyways. If you want to browse through some default news feel free to remove the last
    =:custom= option
    #+begin_src emacs-lisp :tangle emacsconfig/extras.el
      (use-package elfeed
        :bind
        ("C-x w" . elfeed)
        (:map elfeed-search-mode-map
              ("C-c a" . elfeed-add-feed)
              ("C-c u" . elfeed-update)
              ("C-c f" . elfeed-update-feed)
              ("C-c r" . elfeed-mark-all-as-read))
        :config
        (defun elfeed-mark-all-as-read ()
          (interactive)
          (mark-whole-buffer)
          (elfeed-search-untag-all-unread))
        :custom
        (elfeed-search-filter  "@6-months-ago +quality")
        (elfeed-feeds  '(("http://feeds.feedburner.com/tweakers/nieuws" NL tech exportable)
                         ("https://discourse.nixos.org/c/announcements/8.rss" nixos programming quality)
                         ("http://www.dnbradio.com/feeds" music podcasts)
                         ("https://codepen.io/spark/feed/" programming quality)
                         ("https://envs.net/~lucidiot/rsrsss/feed.xml" RSS quality)
                         ("https://falseknees.tumblr.com/rss" comics quality)
                         ("https://hackspace.raspberrypi.org/feed" tech programming)
                         ("https://lobste.rs/rss" programming)
                         ("https://news.rickcarlino.com/rss.rss" tech)
                         ("https://nu.nl/rss" NL news exportable)
                         ("https://planet.haskell.org/atom.xml" haskell programming)
                         ("https://planet.nixos.org/atom.xml" nixos programming quality)
                         ("https://reddit.com/r/dnb/.rss" reddit music)
                         ("https://reddit.com/r/programming/.rss" reddit programming)
                         ("https://reddit.com/r/realdubstep/.rss" reddit music)
                         ("https://reddit.com/r/thenetherlands/.rss" NL reddit)
                         ("https://sachachua.com/blog/category/emacs-news/feed" emacs quality programming)
                         ("https://webzine.puffy.cafe/atom.xml" openbsd tech quality programming)
                         ("https://www.fosskers.ca/en/rss" programming quality exportable)
                         ("https://xkcd.com/atom.xml" comics)))
        (elfeed-feeds nil))
    #+end_src
*** Evil mode
    I am originally a vim user, and the standard vim bindings have not left my hands yet,
    I am not a big configurer, so this is mostly just the standard configuration that [[https://github.com/emacs-evil/evil-collection#installation][evil-mode]] advices you to do
    #+begin_src emacs-lisp :tangle emacsconfig/evil.el
      (use-package evil
        :init
        (setq evil-want-integration t) ;; This is optional since it's already set to t by default.
        (setq evil-want-keybinding nil)
        :config
        (evil-define-key 'normal global-map "," 'evil-execute-in-god-state)
        (evil-mode 1))

      (use-package evil-collection
        :after evil
        :config
        (evil-collection-init))
    #+end_src
**** God-mode
     To further prove that I have no intentions at all to be busy with making evil bindings for eveything I find
     I have also installed god-mode to help me do effortless keybinding for those programs that don't have evil
     support
     #+begin_src emacs-lisp :tangle emacsconfig/evil.el
       (use-package evil-god-state
         :bind
         ("M-," . evil-god-state-bail))

       (use-package god-mode)
     #+end_src
**** Tree-sitter
     There is a pre-configured package that allows for easy tree-sitter support for a few languages. Nixos + tree-sitter
     is surprisingly painless, so I figured I'd just add it
     #+begin_src emacs-lisp :tangle emacsconfig/evil.el
       (use-package evil-tree-edit
         :hook
         (java-mode . evil-tree-edit-mode)
         (python-mode . evil-tree-edit-mode))
     #+end_src
*** Which-key
    Has god-mode support
    #+begin_src emacs-lisp :tangle emacsconfig/extras.el
      (use-package which-key
        :after god-mode
        :config
        (which-key-enable-god-mode-support)
        (which-key-mode))
    #+end_src
** Programming-related emacs tools
   I do computer science, so from now and then I tend to program a bit. Here are all the tools I use to accomplish
   that stuff
*** Company
    Generally nice for auto-completion anywhere. I think here is also the place to note that I am not a huge fan
    of language-servers, as I've had bad experiences with them when I was still using vim
    #+begin_src emacs-lisp :tangle emacsconfig/extras.el
      (use-package company
        :bind
        ("C-SPC" . company-complete))
    #+end_src
*** Matching of parentheses and other stuff
    "ERROR: Unmatched parenteses/braces/whatever" is really a thing I would prefer to never see again
    It has nix and lisp support, but other langages are fairly standards so not much configuration needed there
    #+begin_src emacs-lisp :tangle emacsconfig/extras.el
      (use-package smartparens
        :hook
        (emacs-lisp-mode . smartparens-mode)
        (nix-mode . smartparens-mode)
        (lisp-mode . smartparens-mode)
        :config
        (sp-with-modes '(lisp-mode emacs-lisp-mode)
          (sp-local-pair "'" nil :actions nil)
          (sp-local-pair "`" nil :actions nil))

        (sp-with-modes '(nix-mode)
          (sp-local-pair "'" nil :actions nil)
          (sp-local-pair "''" "''")))
    #+end_src
*** Languages
    Other than that, there are some language-specific setups that I want to do,which are a bit more complicated
    than just "editing a file"
**** Nix
     Nix is a fairly essential language here. Not just because I run NixOS, but also because it provides
     external packages (interpreters, compilers, tooling etc.) to the programs that need it
***** Nix mode
      This config is just part of editing nix config. It is supposed to come with company support, but
      the auto-completion backend turns out to not be that great. We'll see what I do with it
      #+begin_src emacs-lisp :tangle emacsconfig/nix.el
        (use-package nix-mode
          :mode "\\.nix\\'"
          :hook
          (nix-mode . company-mode)
          :config
          ;; the company-nix backend is not available in melpa, but has no new dependencies
          (unless (package-installed-p 'company-nix)
            (with-temp-buffer
              (url-insert-file-contents "https://github.com/NixOS/nix-mode/raw/master/nix-company.el")
              (eval-buffer)))
          (add-hook 'nix-mode-hook (lambda ()
                                     (set (make-local-variable 'company-backends)
                                          '((company-nix)))))
          (add-hook 'nix-mode-hook 'company-mode))
      #+end_src
***** Nix package management
      I use nix-sandbox for managing nix package for other languages.
      One of the functions doesn't work that well for me so I replaced it with something that does
      #+begin_src emacs-lisp :tangle emacsconfig/nix.el
        (use-package nix-sandbox
          :config
          (defun nix-executable-find (sandbox executable)
            "finds an EXECUTABLE in SANDBOX"
            (set (make-local-variable 'exec-path) (nix-exec-path sandbox))
            (executable-find executable)))
      #+end_src
      Beyond that, there is a helper function that makes it easy to quickly define environments with the required
      packages for a programming language
      #+begin_src emacs-lisp :tangle emacsconfig/nix.el
        (defun nix-env-from-packages (name &rest packages)
          "create a nix environment from nix packages. returns the location of the environment"
          (interactive (append
                        (list (read-string "Environment name: " nil nil "nameless"))
                        (split-string (read-string "Packages: "))))
          (with-temp-buffer
            (insert (format "
        { pkgs ? import %s {}}:
        pkgs.mkShell {
        buildInputs = with pkgs;[
        %s
        ];
        }
            " (or nix-nixpkgs-path "<nixpkgs>") (apply 'concat (intersperse "\n" packages))))
            (write-file (concat temporary-file-directory name "-env/shell.nix"))
            (nix-find-sandbox (concat temporary-file-directory name "-env"))))
      #+end_src
**** Python
     Python is a bit weird. It had no intentions at all to do things the way I wanted it to do things with
     use-package, so I had to find a weird work-arounds with add-hook and all that stuff
     #+begin_src emacs-lisp :tangle emacsconfig/python.el :padline no :noweb no-export
       (add-hook 'python-mode-hook (lambda ()
                                     <<el-python-config>>))

     #+end_src
     First we set an interpreter with nix, it comes with all the python autocompletion tools we need
     #+begin_src emacs-lisp :noweb-ref el-python-config :tangle no
       (setq python-shell-interpreter
             (nix-executable-find
              (nix-env-from-packages "python" "(python3.withPackages (p: with p; [pygame virtualenvwrapper pip sqlite jedi flake8 yapf autopep8 black]))")
              "python"))

     #+end_src
     Then we introduce elpy with so that it can use all the tools immidiately without downloading them
     #+begin_src emacs-lisp :noweb-ref el-python-config :tangle no
       (use-package elpy
         :config
         (elpy-enable)
         (setq elpy-rpc-python-command python-shell-interpreter))

     #+end_src
**** Web stuff
     I also have made some basic webpages. I haven't gotten too deep into JS with emacs yet, so this section
     might expand later, but so far this is what I have
***** Web mode
      General xml stuff editing. Fairly standard
      #+begin_src emacs-lisp :tangle emacsconfig/web.el
        (use-package web-mode
          :mode (("\\.x?html?\\'" . web-mode)
                 ("\\.x[sm]l\\'"  . web-mode)
                 ("\\.css\\'"     . web-mode)
                 ("\\.jsx?\\'"    . web-mode)
                 ("\\.tsx?\\'"    . web-mode)
                 ("\\.json\\'"    . web-mode))
          :custom
          (web-mode-markup-indent-offset 2) ; HTML
          (web-mode-css-indent-offset 2)    ; CSS
          (web-mode-code-indent-offset 2)   ; JS/JSX/TS/TSX
          (web-mode-content-types-alist '(("jsx" . "\\.js[x]?\\'"))))
        (use-package elnode)

      #+end_src
***** Emmet mode
      for quickly inserting a whole XML tree
      #+begin_src emacs-lisp :tangle emacsconfig/web.el
        (use-package emmet-mode
          :hook
          (sgml-mode . emmet-mode)
          (web-mode . emmet-mode)
          (css-mode . emmet-mode)
          :bind
          ("TAB" . emmet-dwim)
          :config
          (defun emmet-dwim (prefix)
            (interactive "p")
            (or
             (emmet-go-to-edit-point prefix)
             (emmet-expand-line prefix)
             (evil-jump-forward prefix))))
      #+end_src
** Other, less useful stuff
*** Themes
    I like to have a nice theme in my setup
    #+begin_src emacs-lisp :tangle emacsconfig/misc.el
      (use-package flatland-theme
        :config
        (load-theme 'flatland))
    #+end_src
*** Discord
    My discord buddies /have/ to know I'm using emacs whenever I have my computer running
    #+begin_src emacs-lisp :tangle emacsconfig/misc.el
      (use-package elcord
        :config
        (elcord-mode))
    #+end_src
*** Emenu
    Since I'm using emacs as a daemon, it can also be benefical to make an application launcer
    #+begin_src emacs-lisp :tangle emacsconfig/misc.el
      (defun all-commands ()
        "does a completing read of all the programs accessible to you in $PATH"
        (let ((ls-output (mapcan (lambda (path)
                                   (when (file-readable-p path)
                                     (cl-remove-if (lambda (file)
                                                     (let ((fullpath (concat path "/" file)))
                                                       (or (file-directory-p fullpath)
                                                           (not (file-executable-p fullpath)))))
                                                   (directory-files path nil directory-files-no-dot-files-regexp nil))))
                                 (split-string (getenv "PATH") ":" t)))
              (alias-output (split-string (shell-command-to-string "alias -p | sed -E 's/^alias ([^=]*)=.*$/\1/'") "\n")))
          (ido-completing-read "Command: " (append ls-output alias-output))))

      (defun emenu ()
        "A dmenu-inspired application launcher using a separate emacs frame"
        (interactive)
        (with-selected-frame (make-frame '((name . "emenu")
                                           (minibuffer . only)
                                           (width . 151)
                                           (height . 1)))
          (unwind-protect
              (progn
                (call-process (all-commands) nil 0)
                (keyboard-quit))
            (delete-frame))))
    #+end_src