dotfiles/emacs/.emacs.d/init.org

#+TITLE: Tom-Emacs Interface
#+STARTUP: content
#+MACRO: key   @@html:<kbd>$1</kbd>@@@@ascii:`$1'@@

This is my personal Emacs configuration. The name was inspired by
"Ghost in the Shell 2: Man-Machine Interface" and Ryan Rix's "Complete
Computing Environment".

* Preamble

  These are some settings that need to be taken care of before the
  rest.

** Lexical binding

   To start off, first I need to enable lexical binding. It offers
   better performance in some circumstances and enables me to use cool
   things such as closures.

   #+BEGIN_SRC emacs-lisp :padline no
     ;; -*- lexical-binding: t; -*-
   #+END_SRC

** Load path

   Emacs' load path is where it looks to find Emacs Lisp files when
   confronted with a ~load~ or ~require~ form. Most of my packages are
   managed through the package manager, but not all of them.

*** Mode-specific configuration directory

    Add the directory with my mode-specific configuration files to the
    load path.

    #+BEGIN_SRC emacs-lisp
      (add-to-list 'load-path (locate-user-emacs-file "init/"))
    #+END_SRC

*** Vendor directory

    Add all my vendored packages to the load path.

    #+BEGIN_SRC emacs-lisp
      (eval-and-compile
        (mapc (lambda (d) (add-to-list 'load-path d))
              (directory-files
               (locate-user-emacs-file "vendor-lisp/") t "^[^.]")))
    #+END_SRC

*** Site lisp

    Setup everything so that any autoloads in =site-lisp/= get loaded
    and can be used.

    #+BEGIN_SRC emacs-lisp
      (eval-and-compile
        (add-to-list 'load-path (locate-user-emacs-file "site-lisp/"))
        (let ((loaddefs (locate-user-emacs-file "site-lisp/site-autoloads.el")))
          (when (file-exists-p loaddefs)
            (load loaddefs))))
    #+END_SRC

** Helper functions

   Some things are best abstracted into special functions and/or
   macros so as not to make the setting itself too verbose.

   I have some helper functions stored away in a separate file.

   #+BEGIN_SRC emacs-lisp
    (require 'oni-helpers)
   #+END_SRC

** Package configuration

   Since Emacs 24 there has been a package manager in Emacs. A lot of
   packages have been added to a number of package repositories.

*** Load the package manager

    Require package.el since I immediately start using its variables
    and functions anyway, no need to delay loading.

    #+BEGIN_SRC emacs-lisp
      (require 'package)
    #+END_SRC

*** Add package archives

    The default package archive has some pretty neat packages, but the
    Melpa package archive is much more popular because it doesn't
    require copyright assignment to upload packages to it and it is
    well integrated with git.

    I add these archives both at compile-time and run-time because I
    install missing packages at compile-time. If the archives aren't
    added then, the packages can't be installed.

**** Add Melpa

     Add the Melpa package archive because I like living on the
     bleeding edge.

     #+BEGIN_SRC emacs-lisp
       (eval-and-compile
         (add-to-list 'package-archives '("melpa" . "https://melpa.org/packages/")))
     #+END_SRC

**** Add org

     Add the org package archive because it hosts the latest org
     development release, and as stated above, I like living on the
     bleeding edge.

     #+BEGIN_SRC emacs-lisp
       (eval-and-compile
         (add-to-list 'package-archives '("org" . "http://orgmode.org/elpa/")))
     #+END_SRC

*** Initialize the package manager

    Initialize package.el so that packages can be loaded and used.
    This also needs to be done at both run-time and compile-time so
    packages can be installed at compile-time.

    #+BEGIN_SRC emacs-lisp
      (eval-and-compile (package-initialize))
    #+END_SRC

*** Install missing packages

    Refresh the package contents so packages can be installed from all
    configured archives. Don't do this at run-time because it slows
    down the process too much. Afterwards

    #+BEGIN_SRC emacs-lisp
      (eval-when-compile
        (let* ((not-installed (seq-remove 'package-installed-p
                                          package-selected-packages))
               (available (seq-filter (lambda (p)
                                        (assq p package-archive-contents))
                                      not-installed))
               (difference (- (length not-installed) (length available))))
          (when (> difference 0)
            (silently "Refresh packages"
              (package-refresh-contents)))
          (when available
            (mapc (lambda (p) (package-install p t)) available))))
    #+END_SRC

* General settings

  These settings are generally not associated with a specific mode,
  but affect how the core of Emacs behaves.

** Files

   There are a lot of files that Emacs uses to keep track of things. I
   usually prefer to keep them all in one place together, instead of
   spreading them around the filesystem. With exceptions of course.

*** Backups

    I don't like having every directory filled with "filename~" files.
    So instead of saving backup files to the same directory, save them
    to a special one instead.

    #+BEGIN_SRC emacs-lisp
      (setq backup-directory-alist `((".*" . ,(oni:data-location "backup-files/"))))
    #+END_SRC

*** Auto saves

    I prefer to keep all autosave files in a single directory so they
    don't clog up my filesystem so much.

**** Auto save files

     Usually these files get deleted, but sometimes they don't, and I
     don't think they look pretty. Add it to the end of the list
     because the default value stores auto-saves for remote files in
     /tmp, which is fine by me.

     #+BEGIN_SRC emacs-lisp
       (add-to-list 'auto-save-file-name-transforms
                    `(".*" ,(oni:data-location "auto-save-files/") t) :append)
     #+END_SRC

**** Auto save indexes

     Place the files which contain the indexes of auto save files in a
     similar directory.

     #+BEGIN_SRC emacs-lisp
       (setq auto-save-list-file-prefix (oni:data-location "auto-save-list/.saves-"))
     #+END_SRC

*** Additional file type mappings

    Load =*.js= files with [[JavaScript IDE mode]]. ~js2-mode~ is a better
    JavaScript mode than plain old ~js-mode~.

    #+BEGIN_SRC emacs-lisp
      (add-to-list 'auto-mode-alist '("\\.js\\'" . js2-mode))
    #+END_SRC

** Global Keybindings

   Bind expand-region, which functions a lot like a better
   ~mark-sexp~.

   #+BEGIN_SRC emacs-lisp
     (global-set-key (kbd "C-M-SPC") 'er/expand-region)
   #+END_SRC

   Using multiple cursors can be really handy when you have the same
   edits to make on multiple levels.

   #+BEGIN_SRC emacs-lisp
     (global-set-key (kbd "M-+") 'mc/mark-next-like-this)
   #+END_SRC

   I've been looking for something like Embrace for a long time. I
   really like the =surround.vim= module for vim (which I've only used
   as =evil-surround= in =evil-mode=). Though because Emacs is not a
   moded editor like vim, it's hard to find the right way to do
   things.

   #+BEGIN_SRC emacs-lisp
     (global-set-key (kbd "C-c (") 'embrace-commander)
   #+END_SRC

*** Hydra

    Hydra is an interesting way of managing keybindings, I want to
    experiment.

    Add a hydra for org.

    #+BEGIN_SRC emacs-lisp
      (global-set-key (kbd "C-c o") 'oni-hydra-org/body)
    #+END_SRC

    Add a hydra for magit.

    #+BEGIN_SRC emacs-lisp
      (global-set-key (kbd "C-c m") 'oni-hydra-magit/body)
    #+END_SRC

* Typographic style

  Emacs being a text editor has options on how to handle your text.

** Whitespace

   Even though whitespace technically isn't seen, it can still be an
   eyesore and highly annoying, you must always keep it well in check.

*** Remove trailing whitespace before saving

    I hate it when trailing whitespace is left around a file. I've
    been using this for years, and apart from having some trouble
    working with people who don't pay attention to it, it has worked
    flawlessly.

    #+BEGIN_SRC emacs-lisp
      (require 'destroy-trailing-whitespace)
      (global-destroy-trailing-whitespace-mode)
    #+END_SRC

*** Make sure there is a newline at the end of the file

    Having a final newline at the end of the file is always a good
    idea. Some programs just don't work without it and others produce
    some strange results. Github diffs are an example.

    #+BEGIN_SRC emacs-lisp
      (setq require-final-newline t)
    #+END_SRC

*** Tabs

    Unless absolutely necessary, I really don't want any tabs in my
    code.

**** Don't use tabs for indentation

     Generally I prefer using spaces over tabs. Especially for
     lisp-like languages.

     #+BEGIN_SRC emacs-lisp
       (setq-default indent-tabs-mode nil)
     #+END_SRC

**** Display tabs as 4 columns wide

     A tab-width of 8 is too wide for me, and 2 is too narrow. 4 is
     just right.

     #+BEGIN_SRC emacs-lisp
       (setq-default tab-width 4)
     #+END_SRC

*** Sentences end with a single space

    I'm not an American, and I don't follow American grammatical rules
    when I write. I have always ended my sentences with a single space
    and I'm sure I'll always keep doing that.

    #+BEGIN_SRC emacs-lisp
      (setq sentence-end-double-space nil)
    #+END_SRC

** User Interface

   Emacs' user interface is very configurable, from themes to hiding
   unnecessary elements.

*** Inhibit startup screen

    I've been using Emacs long enough not to need the startup screen
    anymore. I don't see it on my PC where I start Emacs in daemon
    mode, but on my laptop I always start it normally, so it gets in
    the way.

    #+BEGIN_SRC emacs-lisp
      (setq inhibit-startup-screen t)
    #+END_SRC

*** Font

    Set the default font to a more pleasing one, in my opinion, with a
    better size as well.

    #+BEGIN_SRC emacs-lisp
      (add-to-list 'default-frame-alist '(font . "Fantasque Sans Mono-15"))
    #+END_SRC

*** Internal border

    For aesthetics I like to have a thick border on the inside of my
    Emacs window. I have the same border in URxvt, but I haven't found
    out how to add it to Conkeror yet.

    #+BEGIN_SRC emacs-lisp
      (add-to-list 'default-frame-alist '(internal-border-width . 15))
    #+END_SRC

*** Menu bar

    I don't use the menu bar, so it just takes up space.

    #+BEGIN_SRC emacs-lisp
      (menu-bar-mode -1)
    #+END_SRC

*** Tool bar

    I don't use the tool bar, so it just takes up space.

    #+BEGIN_SRC emacs-lisp
      (tool-bar-mode -1)
    #+END_SRC

*** Scroll bar

    I don't use the scroll bar to either navigate my buffers or see
    whereabouts I am, so they just take up space.

    #+BEGIN_SRC emacs-lisp
      (scroll-bar-mode -1)
    #+END_SRC

*** Cursor

    Use a bar cursor instead of a box.

    #+BEGIN_SRC emacs-lisp
      (setq-default cursor-type '(bar . 2))
    #+END_SRC

*** Long lines

    By default Emacs wraps long lines around to the next line when
    they reach the far end of the window. However I prefer to have
    them truncated instead.

    #+BEGIN_SRC emacs-lisp
      (setq-default truncate-lines t)
    #+END_SRC

*** Suspend

    The {{{key(C-z)}}} key in a terminal suspends the current
    application to the background and lets you do other things on the
    command line without having to fully close the application. In GUI
    Emacs this minimizes the current frame. I have no place for it to
    minimize to (no task bar or anything), so this just freezes my
    frame. To prevent this from happening I unbind the {{{key(C-z)}}}
    key.

    #+BEGIN_SRC emacs-lisp
      (global-unset-key (kbd "C-z"))
    #+END_SRC

*** Don't ask for yes or no

    One of the more annoying things can be when Emacs starts asking
    for confirmation and you have to type in =yes= or =no=. I get that
    this is to prevent you from accidentally performing an action, but
    just =y= or =n= has since 2008 not made me accidentally perform
    any action I didn't mean to.

    #+BEGIN_SRC emacs-lisp
      (defalias 'yes-or-no-p 'y-or-n-p)
    #+END_SRC

*** Show any matching parenthesis

    When working in Lisp code (but other code as well) it can be very
    handy to see which parenthesis the one near the cursor matches.

    #+BEGIN_SRC emacs-lisp
      (show-paren-mode)
    #+END_SRC

* Theme

  Load my personal theme. I sometimes change it to a different theme,
  but for some reason I always come crawling back to it.

  #+BEGIN_SRC emacs-lisp
    (add-to-list 'custom-theme-load-path
                 (concat user-emacs-directory "vendor-lisp/yoshi-theme"))
    (load-theme 'yoshi :no-confirm)
  #+END_SRC

  Load my personal SVG mode-line theme.

  #+BEGIN_SRC emacs-lisp
    (require 'svg-mode-line-themes)
    (require 'oni-smt)

    (smt/enable)
    (smt/set-theme 'oni-smt)
  #+END_SRC

  Because SVG mode-line themes doesn't include the box around the
  mode-line, remove it (my personal theme adds it as padding).

  #+BEGIN_SRC emacs-lisp
    (set-face-attribute 'mode-line nil :box nil)
    (set-face-attribute 'mode-line-inactive nil :box nil)
  #+END_SRC

* Diminish

  I really don't need to see some of the minor modes.

  #+BEGIN_SRC emacs-lisp
    (require 'diminish)
  #+END_SRC

* Ivy

  Ivy is a completing read implementation that offers choises
  vertically. I'm surprised how much I like it. I've tried Swiper
  before and I didn't like that so much.

  Since I immediately use and enable Ivy, there's no need to autoload
  it, so require it to keep the byte-compiler quiet.

  #+BEGIN_SRC emacs-lisp
    (require 'ivy)
  #+END_SRC

  Don't show that ivy is enabled in the mode-line. It's enabled
  globally and I'll notice it from other things anyway (like it
  showing up).

  #+BEGIN_SRC emacs-lisp
    (diminish 'ivy-mode)
  #+END_SRC

  Enable fuzzy matching in Ivy.

  #+BEGIN_SRC emacs-lisp
    (setq ivy-re-builders-alist '((t . ivy--regex-fuzzy))
          ivy-initial-inputs-alist nil)
  #+END_SRC

  Enable Ivy.

  #+BEGIN_SRC emacs-lisp
    (ivy-mode)
  #+END_SRC

* Counsel

  Counsel is a group of functions that use Ivy to specialize on
  certain built-in commands, such as {{{key(M-x)}}}.

  Since I enable Counsel mode immediately, there's no point in leaving
  it to be autoloaded. Requiring it keeps the byte-compiler happy.

  #+BEGIN_SRC emacs-lisp
    (require 'counsel)
  #+END_SRC

  Hide dotfiles in ~counsel-find-file~.

  #+BEGIN_SRC emacs-lisp
    (setq counsel-find-file-ignore-regexp
          (rx (or (and bos ".")
                  (and ".zwc" eos))))
  #+END_SRC

  Enable Counsel.

  #+BEGIN_SRC emacs-lisp
    (counsel-mode)
  #+END_SRC

  Don't show that counsel is enabled in the mode-line. It's enabled
  globally and I'll notice whenever I press {{{key(M-x)}}} for
  example.

  #+BEGIN_SRC emacs-lisp
    (diminish 'counsel-mode)
  #+END_SRC

* Bookmarks

  Save bookmarks in my data directory so my ~user-emacs-directory~ is
  less cluttered.

  #+BEGIN_SRC emacs-lisp
    (eval-when-compile (require 'bookmark))
    (setq bookmark-default-file (oni:data-location "bookmarks"))
  #+END_SRC

* Personal info

  Set some personal info for, for example, Gnus to use.

  #+BEGIN_SRC emacs-lisp
    (setq user-full-name "Tom Willemse"
          user-mail-address "tom@ryuslash.org")
  #+END_SRC

* Automatic alignment

  Emacs has some powerful automatic alignment features.

  #+BEGIN_SRC emacs-lisp
    (eval-when-compile (require 'align))
  #+END_SRC

** CSS

   Align CSS files like so:

   #+BEGIN_SRC css
     body        { color: #ffffff;            }
     .some-class { background-color: #ffffff; }
     #some-id    { width: 200px;              }

     .some-more-class {
         color:            #ffffff;
         background-color: #ffffff;
         width:            200px;
     }
   #+END_SRC

   #+BEGIN_SRC emacs-lisp
     (with-eval-after-load 'align
       ;; Keep these in order. They are each added to the _front_ of the
       ;; list and are applied in order. Changing their order will change
       ;; the results.
       (add-to-list 'align-rules-list
                    `(css-closing-brace
                      (regexp . ,(rx (group (0+ whitespace)) "}" eol))
                      (group . (1))
                      (modes . '(scss-mode css-mode))))
       (add-to-list 'align-rules-list
                    `(css-colons
                      (regexp . ,(rx bol
                                     (0+ whitespace)
                                     (1+ (any (?a . ?z) ?- ?$))
                                     ":"
                                     (group (0+ whitespace))
                                     (0+ nonl)
                                     ";"
                                     eol))
                      (group . (1))
                      (modes . '(scss-mode css-mode))
                      (repeat . t)))
       (add-to-list 'align-rules-list
                    `(css-opening-brace
                      (regexp . ,(rx bol
                                     (0+ whitespace)
                                     (0+ (any ?# ?. ?, ?\s ?& ?: ?-
                                              (?a . ?z) (?A . ?Z) (?0 . ?9)))
                                     (any (?a . ?z) (?A . ?Z) (?0 . ?9))
                                     (group (0+ whitespace))
                                     "{"
                                     (0+ nonl)))
                      (group . (1))
                      (modes . '(scss-mode css-mode)))))
   #+END_SRC

** PHP

   In PHP code it's nice to have any ~=>~ aligned.

   #+BEGIN_SRC php
     <?php
     array(
         'foo'  => 'bar',
         'frob' => 'baz'
     );
     ?>
   #+END_SRC

   #+BEGIN_SRC emacs-lisp
     (with-eval-after-load 'align
       (add-to-list 'align-rules-list
                    `(php-array-arrow
                      (regexp . ,(rx any (group whitespace) "=>" any))
                      (group . (1))
                      (modes . '(php-mode web-mode))
                      (repeat . t))))
   #+END_SRC

* Url browsing

  Use Firefox to open URLs.

  #+BEGIN_SRC emacs-lisp
    (eval-when-compile (require 'browse-url))

    (with-eval-after-load 'browse-url
      (setq browse-url-browser-function 'browse-url-firefox))
  #+END_SRC

* Minibuffer

  Enable Electric pair mode in the minibuffer. I tried Paredit for a
  little while, but I forgot that it isn't always only lisp that I'm
  entering in the minibuffer.

  #+BEGIN_SRC emacs-lisp
    (add-hook 'minibuffer-setup-hook 'electric-pair-local-mode)
  #+END_SRC

* Shackle

  Shackle is an abstraction over ~display-buffer-alist~.

  #+BEGIN_SRC emacs-lisp
    (require 'shackle)
    (shackle-mode)
  #+END_SRC

* Libraries

  - [[file:init/oni-shr-init.org][shr]]

    #+BEGIN_SRC emacs-lisp
      (with-eval-after-load 'shr (load "oni-shr-init"))
    #+END_SRC

* Minor modes

  - [[file:init/oni-company-init.org][Company mode]] :: A better auto completion system than auto
       complete.

       #+BEGIN_SRC emacs-lisp
         (with-eval-after-load 'company (load "oni-company-init"))
       #+END_SRC

** Paredit

   Paredit is an awesome minor-mode to have when you write in any
   lisp-like languages. It can feel rather strict and uncomfortable at
   first, but once you get the hang of using it, you won't want to
   live without it.

   Don't show that paredit is enabled, it should be obvious from the
   effects it has. This will save some precious real-estate on my mode
   line.

   #+BEGIN_SRC emacs-lisp
     (with-eval-after-load 'paredit
       (diminish 'paredit-mode))
   #+END_SRC

** Electric indent mode

   By default ~electric-indent-mode~ is enabled globally, but I prefer
   to enable it locally where I need it.

   #+BEGIN_SRC emacs-lisp
     (electric-indent-mode -1)
   #+END_SRC

   Since Emacs 24 ~electric-indent-mode~ switches the behavior of the
   {{{key(C-j)}}} and {{{key(RET)}}} keys. I prefer the original
   situation because my muscle-memory still remembers to use
   {{{key(C-j)}}} for newline-and-indent behaviour.

   #+BEGIN_SRC emacs-lisp
     (defun oni:switch-newline-keys ()
       "Switch the C-j and RET keys in the local buffer."
       (if electric-indent-mode
           (progn
             (local-set-key (kbd "C-j") 'newline)
             (local-set-key (kbd "RET") 'electric-newline-and-maybe-indent))
         (local-unset-key (kbd "C-j"))
         (local-unset-key (kbd "RET"))))

     (add-hook 'electric-indent-local-mode-hook #'oni:switch-newline-keys)
   #+END_SRC

** Flycheck

   Flycheck lets me see (compiler) errors, warnings and info messages
   while writing code.

   When developing packages with Cask, some special care needs to be
   taken to ensure the checkers work correctly.

   #+BEGIN_SRC emacs-lisp
     (add-hook 'flycheck-mode-hook 'flycheck-cask-setup)
   #+END_SRC

   I disable the pylint and pyflakes checkers because they don't seem
   to add much except noise when used together with flake8. Also
   pylint seems hell-bent on making Python written like a
   statically-typed langauge.

   #+BEGIN_SRC emacs-lisp
     (with-eval-after-load 'flycheck
       (mapc (lambda (c) (delq c flycheck-checkers))
             '(python-pylint python-pyflakes)))
   #+END_SRC

   Also show which columns messages appear in.

   #+BEGIN_SRC emacs-lisp
     (with-eval-after-load 'flycheck
       (setq flycheck-highlighting-mode 'columns))
   #+END_SRC

   Show the error message at point in a tooltip.

   #+BEGIN_SRC emacs-lisp
     (with-eval-after-load 'flycheck
       (require 'flycheck-pos-tip)
       (flycheck-pos-tip-mode))
   #+END_SRC

   Shorten the flycheck mode line lighter.

   #+BEGIN_SRC emacs-lisp
     (with-eval-after-load 'flycheck
       (setq flycheck-mode-line-prefix "✓"))
   #+END_SRC

** Auto revert mode

   ARev isn't very descriptive, and fairly wide. Use a font-awesome
   icon instead.

   #+BEGIN_SRC emacs-lisp
     (with-eval-after-load 'autorevert
       (diminish 'auto-revert-mode
                 (propertize (concat "  " (char-to-string #xf021))
                             'face '(:family "Font Awesome" :height 0.75))))
   #+END_SRC

** Auto fill mode

   "Fill" is fine as a mode-line lighter, but I prefer something
   shorter.

   #+BEGIN_SRC emacs-lisp
     (diminish 'auto-fill-function
               (propertize (concat "  " (char-to-string #xf149))
                           'face '(:family "Font Awesome" :height 0.75)))
   #+END_SRC

** Diff highlight mode

   Show the state of lines added, changed and removed since the last
   commit.

   #+BEGIN_SRC emacs-lisp
     (require 'diff-hl)
     (global-diff-hl-mode)
   #+END_SRC

   Add p4 options for diff-hl to fix diff highlighting in Perforce projects.

   #+BEGIN_SRC emacs-lisp
     (defun oni:with-diff-hl-p4-args (orig-fun &rest args)
       (let ((p4-lowlevel-diff-switches '("-du0")))
         (apply orig-fun args)))

     (with-eval-after-load 'vc-p4
       (add-function :around (symbol-function 'diff-hl-changes-buffer)
                     #'oni:with-diff-hl-p4-args))
   #+END_SRC

** Isearch

   Replace the Isearch mode line lighter with a magnifying glass icon.

   #+BEGIN_SRC emacs-lisp
     (diminish 'isearch-mode
               (propertize (concat "  " (char-to-string #xf002))
                           'face '(:family "Font Awesome" :height 0.75)))
   #+END_SRC

** Projectile

   Projectile is, thus far, the best project module for Emacs.

   Set the known projects file before loading projectile because
   projectile loads the known projects as it's loading, not after.

   #+BEGIN_SRC emacs-lisp
     (setq projectile-known-projects-file
           (oni:data-location "projectile-bookmarks.eld"))
   #+END_SRC

   Since I'm just going to use it anyway, require it immediately.

   #+BEGIN_SRC emacs-lisp
     (require 'projectile)
   #+END_SRC

   I don't like that projectile tries to take up so much space in my
   mode-line, so I try to make it a little shorter.

   #+BEGIN_SRC emacs-lisp
     (with-eval-after-load 'projectile
       (setq projectile-mode-line
             '(:eval
               (if (file-remote-p default-directory)
                   " P"
                 (let ((name (projectile-project-name)))
                   (if (string= "-" name)
                       ""
                     (format " P[%s]" name)))))))
   #+END_SRC

   Store projectile files in my data dir.

   #+BEGIN_SRC emacs-lisp
     (setq projectile-cache-file
           (oni:data-location "projectile.cache"))
   #+END_SRC

   Enable it globally so I can always switch to/from projects.

   #+BEGIN_SRC emacs-lisp
     (projectile-mode)
   #+END_SRC

   Use Ivy for projectile completions.

   #+BEGIN_SRC emacs-lisp
     (setq projectile-completion-system 'ivy)
   #+END_SRC

   Add ~yarn.lock~ as a possible root file for Projectile.

   #+BEGIN_SRC emacs-lisp
     (add-to-list 'projectile-project-root-files "yarn.lock")
   #+END_SRC

** Server mode

   Diminish server mode with a nice icon.

   #+BEGIN_SRC emacs-lisp
     (with-eval-after-load 'server
       (diminish 'server-buffer-clients
                 (propertize (concat "  " (char-to-string #xf233))
                             'face '(:family "Font Awesome" :height 0.75))))
   #+END_SRC

** Slime

   Slime is crucial for developing Common Lisp programs. Set the
   available Lisp implementations and the default implementation to
   use.

   #+BEGIN_SRC emacs-lisp
     (with-eval-after-load 'slime
       (setq slime-lisp-implementations
             '((sbcl ("sbcl" "--noinform") :coding-system utf-8-unix)
               (clisp ("clisp") :coding-system utf-8-unix)))
       (setq slime-default-lisp 'sbcl)
       (slime-setup '(slime-fancy slime-company)))
   #+END_SRC

* Major modes

  Configuration for major modes is specified in dedicated
  configuration files.

  - [[file:init/js-mode.org][js-mode]] :: JavaScript mode is used by me for json files. js2-mode
       doesn't work very nicely with json, always showing syntax
       errors.

       #+BEGIN_SRC emacs-lisp
         (with-eval-after-load 'js (load "oni-js-mode-init"))
       #+END_SRC

  - [[file:init/php-mode-init.org][php-mode]] :: I use PHP mode for files that only contain PHP code,
       no HTML or anything.

       #+BEGIN_SRC emacs-lisp
         (with-eval-after-load 'php-mode (load "oni-php-mode-init"))
       #+END_SRC

  - [[file:init/sh-mode-init.org][sh-mode]] :: Used for most types of shell scripting (bash, zsh,
       etc.).

       #+BEGIN_SRC emacs-lisp
         (with-eval-after-load 'sh-mode (load "oni-sh-mode-init"))
       #+END_SRC

  - [[file:init/oni-css-mode-init.org][css-mode]] :: CSS and SCSS mode are used for stylesheets!

       #+BEGIN_SRC emacs-lisp
         (with-eval-after-load 'css-mode (load "oni-css-mode-init"))
       #+END_SRC

  - [[file:init/oni-emacs-lisp-mode-init.org][emacs-lisp-mode]] :: Emacs lisp is what powers all this Emacs
       awesomeness.

       #+BEGIN_SRC emacs-lisp
         (with-eval-after-load 'elisp-mode (load "oni-emacs-lisp-mode-init"))
       #+END_SRC

  - [[file:init/oni-scheme-init.org][scheme-mode]] :: Scheme is an awesome lisp variant.

       #+BEGIN_SRC emacs-lisp
         (with-eval-after-load 'scheme (load "oni-scheme-init"))
       #+END_SRC

  - [[file:init/oni-compilation-init.org][compilation-mode]] :: Major mode for various compilation processes.

       #+BEGIN_SRC emacs-lisp
         (with-eval-after-load 'compile (load "oni-compilation-init"))
       #+END_SRC

  - [[file:init/oni-java-init.org][java-mode]] :: Major mode for the Java programming language.

       #+BEGIN_SRC emacs-lisp
         (with-eval-after-load 'cc-mode (load "oni-java-init"))
       #+END_SRC


** Inferior Emacs lisp mode (ielm)

   Enable paredit mode.

   #+BEGIN_SRC emacs-lisp
     (add-hook 'ielm-mode-hook 'paredit-mode)
   #+END_SRC

** Mbsync configuration mode

   I wrote a simple major-mode for editing my =.mbsyncrc= file. I
   might release it as a package, but for now I keep it with the rest
   of my configuration.

   Since it isn't installed by package.el, I need to specify the
   autoload myself.

   #+BEGIN_SRC emacs-lisp
     (autoload 'mbsync-conf-mode "mbsync-conf-mode"
       "Major mode for editing mbsync configuration files."
       :interactive)
   #+END_SRC

   I also need to add it to the ~auto-mode-alist~ so =.mbsyncrc= is
   opened with mbsync conf mode.

   #+BEGIN_SRC emacs-lisp
     (add-to-list 'auto-mode-alist '("\\.mbsyncrc\\'" . mbsync-conf-mode))
   #+END_SRC

** Msmtprc mode

   I wrote a simple major-mode for editing my =.msmtprc= file. I might
   release it as a package, but for now I keep it with the rest of my
   configuration.

   Since it isn't installed by package.el, I need to specify the
   autoload myself.

   #+BEGIN_SRC emacs-lisp
     (autoload 'msmtprc-mode "msmtprc-mode"
       "Major mode for editing msmtp configuration files."
       :interactive)
   #+END_SRC

   I also need to add it to the ~auto-mode-alist~ so =.msmtprc= is
   opened with msmtprc mode.

   #+BEGIN_SRC emacs-lisp
     (add-to-list 'auto-mode-alist '("\\.msmtprc\\'" . msmtprc-mode))
   #+END_SRC

** Git commit mode

   Enable ~electric-quote-local-mode~ to easily type nice-looking
   quotes while writing commits.

   #+BEGIN_SRC emacs-lisp
     (add-hook 'git-commit-mode-hook 'electric-quote-local-mode)
   #+END_SRC

** Python mode

   Enable electric pair mode.

   #+BEGIN_SRC emacs-lisp
     (add-hook 'python-mode-hook 'electric-pair-local-mode)
   #+END_SRC

   Enable syntax and style checking with flycheck.

   #+BEGIN_SRC emacs-lisp
     (add-hook 'python-mode-hook 'flycheck-mode)
   #+END_SRC

** Web mode

   Web mode is a good general-purpose web template mode. It works well
   with many template languages and PHP as well.

   Enable a specialized whitespace mode for web mode that shows tabs
   at the beginning of a line.

   #+BEGIN_SRC emacs-lisp
     (add-hook 'web-mode-hook 'oni-whitespace-only-tabs-mode)
   #+END_SRC

** Makefile mode

   Show tabs in Makefiles. Tabs are required at the beginning of any
   non-continuation line in a recipe. I don't use it for indenting,
   however.

   #+BEGIN_SRC emacs-lisp
     (add-hook 'makefile-mode-hook 'oni-whitespace-only-tabs-mode)
   #+END_SRC

   Enable electric pairing.

   #+BEGIN_SRC emacs-lisp
     (add-hook 'makefile-mode-hook 'electric-pair-local-mode)
   #+END_SRC

** Clojure mode

   Install extra font-locking for clojure.

   #+BEGIN_SRC emacs-lisp
     (with-eval-after-load 'clojure-mode
       (require 'clojure-mode-extra-font-locking))
   #+END_SRC

   Enable paredit mode.

   #+BEGIN_SRC emacs-lisp
     (add-hook 'clojure-mode-hook 'paredit-mode)
   #+END_SRC

   Enable rainbow delimiters.

   #+BEGIN_SRC emacs-lisp
     (add-hook 'clojure-mode-hook 'rainbow-delimiters-mode)
   #+END_SRC

   Use the clojure repl as the inferior lisp mode.

   #+BEGIN_SRC emacs-lisp
     (eval-when-compile (require 'inf-lisp))

     (defun oni:clojure-set-inferior-lisp ()
       (setq inferior-lisp-program "lein repl"))
   #+END_SRC

   Add a little more font locking still, and some indentation. This is
   included in the Clojure for the Brave and True configuration.

   #+BEGIN_SRC emacs-lisp
     (add-hook 'clojure-mode-hook 'oni-clojure-add-font-lock)
     (add-hook 'clojure-mode-hook 'oni-clojure-add-indent)
   #+END_SRC

** Cider mode

   Cider is like Slime for Common Lisp. This configuration is copied
   from the one provided by Clojure for the Brave and True.

   Go right to the REPL buffer when it's finished connecting

   #+BEGIN_SRC emacs-lisp
     (with-eval-after-load 'cider
       (setq cider-repl-pop-to-buffer-on-connect t))
   #+END_SRC

   When there's a cider error, show its buffer and switch to it.

   #+BEGIN_SRC emacs-lisp
     (setq cider-show-error-buffer t
           cider-auto-select-error-buffer t)
   #+END_SRC

   Where to store the cider history.

   #+BEGIN_SRC emacs-lisp
     (setq cider-repl-history-file
           (oni:data-location "cider-history"))
   #+END_SRC

   Wrap when navigating history.

   #+BEGIN_SRC emacs-lisp
     (setq cider-repl-wrap-history t)
   #+END_SRC

   Enable paredit in your REPL.

   #+BEGIN_SRC emacs-lisp
     (add-hook 'cider-repl-mode-hook 'paredit-mode)
   #+END_SRC

** C Mode

   Enable electric pair mode.

   #+BEGIN_SRC emacs-lisp
     (add-hook 'c-mode-hook 'electric-pair-local-mode)
   #+END_SRC

   Enable electric indent mode.

   #+BEGIN_SRC emacs-lisp
     (add-hook 'c-mode-hook 'electric-indent-local-mode)
   #+END_SRC

** Lisp mode

   Enable paredit mode for Common Lisp programming.

   #+BEGIN_SRC emacs-lisp
     (add-hook 'lisp-mode-hook 'paredit-mode)
   #+END_SRC

   Enable rainbow-delimiters mode for Common Lisp programming.

   #+BEGIN_SRC emacs-lisp
     (add-hook 'lisp-mode-hook 'rainbow-delimiters-mode)
   #+END_SRC

   Enable company mode for Common Lisp programmind.

   #+BEGIN_SRC emacs-lisp
     (add-hook 'lisp-mode-hook 'company-mode)
   #+END_SRC

** JavaScript IDE mode
   :PROPERTIES:
   :header-args: :tangle "init/oni-js2-init.el"
   :END:

  Since ~js2-mode~ isn't loaded when Emacs starts put the
  configuration in a different file so that it doesn't cause a
  slowdown in startup time.

  #+BEGIN_SRC emacs-lisp :tangle yes
    (with-eval-after-load 'js2-mode (load "oni-js2-init"))
  #+END_SRC

  Keep the byte-compiler happy by requiring ~js2-mode~, by this time
  it will have been loaded anyway.

  #+BEGIN_SRC emacs-lisp
    (require 'js2-mode)
  #+END_SRC

  Silence warnings about trailing commas in JavaScript code. I usually
  write code that goes through Babel or something similar and doesn't
  actually die when a trailing comma is present. Also this should
  really be handled by a linter such as eslint.

  #+BEGIN_SRC emacs-lisp
    (setq js2-strict-trailing-comma-warning nil)
  #+END_SRC

  Enable ~subword-mode~ because a lot of JavaScript identifiers look
  either like =someIdentifier= or =SomeClassName=.

  #+BEGIN_SRC emacs-lisp
    (add-hook 'js2-mode-hook 'subword-mode)
  #+END_SRC

  Set the basic offset to 2 spaces for JavaScript.

  #+BEGIN_SRC emacs-lisp
    (setq js2-basic-offset 2)
  #+END_SRC

* Applications

  - [[file:init/dired-init.org][Dired]] :: The Emacs file manager. Very powerful, and I don't use it
       enough /yet/.

       #+BEGIN_SRC emacs-lisp
         (with-eval-after-load 'dired (load "oni-dired-init"))
       #+END_SRC

  - [[file:init/oni-magit-init.org][Magit]] :: The Emacs git interface. By now I think I may know magit
       better than the git cli.

       #+BEGIN_SRC emacs-lisp
         (with-eval-after-load 'magit (load "oni-magit-init"))
       #+END_SRC

  - [[file:init/ediff-init.org][Ediff]] :: A reall diff application.

       #+BEGIN_SRC emacs-lisp
         (with-eval-after-load 'ediff (load "oni-ediff-init"))
       #+END_SRC

  - [[file:init/oni-eshell-init.org][Eshell]] :: The best shell on the planet.

       #+BEGIN_SRC emacs-lisp
         (with-eval-after-load 'eshell (load "oni-eshell-init"))
       #+END_SRC

  - [[file:init/oni-slack-init.org][Slack]] :: A slack client for Emacs.

       #+BEGIN_SRC emacs-lisp
         (with-eval-after-load 'slack (load "oni-slack-init"))
       #+END_SRC

  - [[file:init/oni-circe-init.org][Circe]] :: A very nice and clean IRC client for Emacs.

       #+BEGIN_SRC emacs-lisp
         (with-eval-after-load 'circe (load "oni-circe-init"))
       #+END_SRC

** Linewise user-interface

   This is the library used by Circe and Slack to display messages.

   #+BEGIN_SRC emacs-lisp
     (eval-when-compile (require 'lui))
   #+END_SRC

   Put the time stamp in lui buffers in the right margin. This gives
   the text some extra room.

   #+BEGIN_SRC emacs-lisp
     (with-eval-after-load 'lui
       (setq lui-time-stamp-position 'right-margin))
   #+END_SRC

   Remove the "[]" from the time stamp, it's not really necessary.

   #+BEGIN_SRC emacs-lisp
     (with-eval-after-load 'lui
       (setq lui-time-stamp-format "%H:%M"))
   #+END_SRC

   Give the right margin just enough room to show the time-stamps, no
   more, no less.

   #+BEGIN_SRC emacs-lisp
     (defun oni:set-circe-margin-width ()
       (setq right-margin-width 5))

     (add-hook 'lui-mode-hook #'oni:set-circe-margin-width)
   #+END_SRC

   Fix the wrap prefix so that text at the prompt is aligned properly.

   #+BEGIN_SRC emacs-lisp
     (defun oni:set-lui-prompt-wrap-prefix ()
       (setq wrap-prefix "  "))

     (add-hook 'lui-mode-hook #'oni:set-lui-prompt-wrap-prefix)
   #+END_SRC

   Enable visual line mode in lui buffers so my text doesn't go
   off-screen.

   #+BEGIN_SRC emacs-lisp
     (add-hook 'lui-mode-hook 'visual-line-mode)
   #+END_SRC

   Turn off filling in lui buffers. I use visual-line mode instead.

   #+BEGIN_SRC emacs-lisp
     (setq lui-fill-type nil)
   #+END_SRC

** Jabber

   I like using XMPP to talk to people, jabber.el is very good at
   this.

   #+BEGIN_SRC emacs-lisp
     (eval-when-compile (require 'jabber))
   #+END_SRC

   Add my account.

   #+BEGIN_SRC emacs-lisp
     (setq jabber-account-list
           `((,(concat "ryuslash@dukgo.com/" (system-name))
              (:connection-type . starttls))))
   #+END_SRC

   Store any persistent data in the data directory.

   #+BEGIN_SRC emacs-lisp
     (setq jabber-avatar-cache-directory (oni:data-location "jabber/avatars/")
           jabber-history-dir (oni:data-location "jabber/hist/"))
   #+END_SRC

   Change the default prompts.

   #+BEGIN_SRC emacs-lisp
     (setq jabber-chat-buffer-format         "+%n"
           jabber-chat-foreign-prompt-format "%t %n "
           jabber-chat-local-prompt-format   "%t %n "
           jabber-chat-delayed-time-format   "%H:%M"
           jabber-groupchat-buffer-format    "++%n"
           jabber-groupchat-prompt-format    "%t %n ")
   #+END_SRC

   Don't show avatars, publish or retrieve avatars.

   #+BEGIN_SRC emacs-lisp
     (setq jabber-chat-buffer-show-avatar nil
           jabber-vcard-avatars-publish   nil
           jabber-vcard-avatars-retrieve  nil)
   #+END_SRC

   Don't fill long lines in jabber chat buffers, but use visual line
   mode.

   #+BEGIN_SRC emacs-lisp
     (setq jabber-chat-fill-long-lines nil)

     (add-hook 'jabber-chat-mode-hook 'visual-line-mode)
   #+END_SRC

   Don't send notifications about chat states.

   #+BEGIN_SRC emacs-lisp
     (setq jabber-chatstates-confirm nil)
   #+END_SRC

   Colorize text in multi-user chats.

   #+BEGIN_SRC emacs-lisp
     (setq jabber-muc-colorize-local   t
           jabber-muc-colorize-foreign t)
   #+END_SRC

   Enable recording history.

   #+BEGIN_SRC emacs-lisp
     (setq jabber-history-enabled    t
           jabber-use-global-history nil)
   #+END_SRC

   Clean up the default view of the roster buffer.

   #+BEGIN_SRC emacs-lisp
     (setq jabber-roster-show-bindings  nil
           jabber-show-offline-contacts nil)

     (add-hook 'jabber-roster-mode-hook 'oni-jabber-set-roster-mode-line)
   #+END_SRC

   Use libnotify to send jabber notifications.

   #+BEGIN_SRC emacs-lisp
     (add-hook 'jabber-alert-message-hooks 'jabber-message-libnotify)
     (add-hook 'jabber-alert-muc-hooks     'jabber-muc-libnotify)
   #+END_SRC

   Don't echo presence changes in the mode line, show them in the
   relevant buffer instead.

   #+BEGIN_SRC emacs-lisp
     (with-eval-after-load 'jabber-alert
       (remove-hook 'jabber-alert-presence-hooks 'jabber-presence-echo))

     (add-hook 'jabber-alert-presence-hooks 'oni-jabber-show-status-in-buffer)
   #+END_SRC

   Set the default directory to my home directory for jabber chat
   buffers.

   #+BEGIN_SRC emacs-lisp
     (defun oni:set-default-directory ()
       (setq default-directory "~/"))

     (add-hook 'jabber-chat-mode-hook 'oni:set-default-directory)
   #+END_SRC

** Gnus
   :PROPERTIES:
   :header-args: :tangle "init/oni-gnus-init.el"
   :END:

   Gnus is the very extensible Emacs news reader, which just happens
   to also function very well as a mail reader. Since it is so
   extensible and also configurable the configuration for it tends to
   get big, so I split it into a separate file.

   #+BEGIN_SRC emacs-lisp :tangle yes
     (with-eval-after-load 'gnus (load "oni-gnus-init"))
   #+END_SRC

   Configuring Gnus is actually configuring a handful of packages, so
   I require them all when Gnus is loaded so the byte compiler won't
   yell at me.

   #+BEGIN_SRC emacs-lisp
     (require 'gnus)
     (require 'gnus-msg)
     (require 'mail-source)
     (require 'message)
     (require 'nnfolder)
     (require 'sendmail)
   #+END_SRC

   I don't like having a lot of files spread around in my =.emacs.d=
   directory, so put all of Gnus', Message's and nnfolder's data in
   =.emacs.d/data=.

   #+BEGIN_SRC emacs-lisp
     (setq gnus-directory (locate-user-emacs-file "data/News")
           gnus-article-save-directory gnus-directory
           gnus-cache-directory gnus-directory
           gnus-kill-files-directory gnus-directory)

     (setq mail-source-directory (locate-user-emacs-file "data/Mail")
           message-directory mail-source-directory
           nnfolder-directory mail-source-directory)
   #+END_SRC

   Use msmtp to send my messages.

   #+BEGIN_SRC emacs-lisp
     (setq send-mail-function 'send-mail-send-it
           message-send-mail-function 'message-send-mail-with-sendmail
           sendmail-program "/usr/bin/msmtp")
   #+END_SRC

   I've been using Gnus for a while now and I don't think I fit the
   profile of a novice anymore. Turning this off will stop Gnus from
   asking me if I'm sure I want to delete a certain message, I do this
   a lot because expiring messages seems to take too long for my
   tastes.

   #+BEGIN_SRC emacs-lisp
     (setq gnus-novice-user nil)
   #+END_SRC

   Add a keybinding to the Gnus summary mode to easily delete
   messages.

   #+BEGIN_SRC emacs-lisp
     (defun oni-gnus-delete-forward (&optional n)
       "Delete the article under point and move to the next one.
     Do this N times."
       (interactive "p")
       (dotimes (_ (or n 1))
         (gnus-summary-delete-article)
         (gnus-summary-next-subject 1)))

     (define-key gnus-summary-mode-map (kbd "M-d") #'oni-gnus-delete-forward)
   #+END_SRC

   Change the format of how each line for a group in the Group buffer
   is displayed. This shows the group name, the select method, group
   subscription status, the process mark (whatever that is), whether
   there is a summary buffer open for that group, number of unread
   articles and the number of ticked articles.

   #+BEGIN_SRC emacs-lisp
     (setq gnus-group-line-format "%P%(%20G%): %-10s %S%p%B %5y %5T\n")
   #+END_SRC

*** Mail accounts

    I mostly use two email accounts.

**** ryuslash.org

     Set my main email account as the primary select method for Gnus.

     #+BEGIN_SRC emacs-lisp
       (setq gnus-select-method
             '(nnmaildir "ryuslash" (directory "~/documents/mail/ryuslash/")))
     #+END_SRC

     When sending mail from the ryuslash inbox, use the ryuslash msmtp
     account.

     #+BEGIN_SRC emacs-lisp
       (add-to-list 'gnus-posting-styles
                    '(".*"
                      (address "tom@ryuslash.org")
                      (eval (setq message-sendmail-extra-arguments
                                  '("-a" "ryuslash")))))
     #+END_SRC

**** gmail.com

     Add my other personal email as a secondary select method.

     #+BEGIN_SRC emacs-lisp
       (add-to-list 'gnus-secondary-select-methods
                    '(nnmaildir "gmail"
                                (directory "~/documents/mail/gmail/")))
     #+END_SRC

     When sending mail from the gmail account, use the gmail msmtp
     accound and set the proper email address.

     #+BEGIN_SRC emacs-lisp
       (add-to-list 'gnus-posting-styles
                    '("gmail:"
                      (name "Tom Willemse")
                      (address "ryuslash@gmail.com")
                      (eval (setq message-sendmail-extra-arguments
                                  '("-a" "gmail")))))
     #+END_SRC

** Org mode
   :PROPERTIES:
   :header-args: :tangle "init/oni-org-init.el"
   :END:

   Since Org mode is a big package and I end up customizing it /a lot/
   I always keep its settings in a separate file since it might be
   awhile before org-mode is loaded.

   #+BEGIN_SRC emacs-lisp :tangle yes
     (with-eval-after-load 'org (load "oni-org-init"))
   #+END_SRC

   To keep the byte-compiler from complaining, require any libraries
   that are used by my configuration when this file is loaded.

   #+BEGIN_SRC emacs-lisp
     (require 'org)
     (require 'org-bullets)
     (require 'org-capture)
   #+END_SRC

   Fontify source code blocks in Org mode natively, meaning that they
   should be fontified using the major mode specified in the source
   block language.

   #+BEGIN_SRC emacs-lisp
     (setq org-src-fontify-natively t)
   #+END_SRC

   Follow the link at point when {{{key(RET)}}} is pressed.

   #+BEGIN_SRC emacs-lisp
     (setq org-return-follows-link t)
   #+END_SRC

   Automatically fill paragraphs while editing text.

   #+BEGIN_SRC emacs-lisp
     (add-hook 'org-mode-hook 'auto-fill-mode)
   #+END_SRC

   Show pretty bullets instead of the default asterisk characters.

   #+BEGIN_SRC emacs-lisp
     (add-hook 'org-mode-hook 'org-bullets-mode)
   #+END_SRC

* Custom

  Put the customize settings in a different file so that Emacs doesn't
  have to modify this file whenever something changes through
  customize. I put this into my init file last so any settings made in
  there *can* overwrite the ones in the rest of the file, not that I
  usually like to do that.

  #+BEGIN_SRC emacs-lisp
    (setq custom-file (concat user-emacs-directory "custom.el"))
    (load custom-file)
  #+END_SRC