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

#+TITLE: Tom-Emacs Interface
#+STARTUP: showall

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".

To start off, first I need to enable lexical binding.

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

* Package configuration

  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 the MELPA and org package archives because I like living on the
  bleeding edge. This should be done both at run-time and compile-time
  so I can install packages at compile time.

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

  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

  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

  Some actions produce a lot of output that is usually uninteresting
  during compilation. However, this information may be crucial when an
  error occurs. So for these actions I can use this macro, which
  stores all sent messages in a temporary buffer and prints them when
  an error occurs, and hides them when it doesn't.

  #+BEGIN_SRC emacs-lisp
    (defmacro silently (title &rest body)
      "Only output something when an error occurs.
    Prefix with TITLE any output that occurs while executing BODY,
    but only when an error occurs, otherwise discard it."
      (declare (indent 1))
      (let ((buffer-var (cl-gensym))
            (error-var (cl-gensym)))
       `(with-temp-buffer
          (let ((,buffer-var (current-buffer)))
            (cl-letf (((symbol-function 'message)
                       (lambda (msg &rest args)
                         (with-current-buffer ,buffer-var
                           (insert "  " (apply 'format msg args) "\n")))))
              (condition-case ,error-var
                  (progn ,@body)
                (error
                 (princ ,(concat title " output:\n"))
                 (princ (with-current-buffer ,buffer-var (buffer-string)))
                 (princ "Error:\n")
                 (princ "  ")
                 (princ (cadr ,error-var))
                 (princ "\n"))))))))
  #+END_SRC

  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.

  #+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

* 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

  I have noticed that I refer to the combination of
  =user-emacs-directory= and "data/" a lot, so I wrote this function
  to make referencing it cleaner. Also useful if I ever want to move
  my data directory.

  #+BEGIN_SRC emacs-lisp
    (defun oni:data-location (file-name)
      "Return the location of FILE-NAME within my data directory.
    This is currently the data directory under the
    `user-emacs-directory'."
      (concat user-emacs-directory "data/" file-name))
  #+END_SRC

  I also wrote a test for it.

  #+BEGIN_SRC emacs-lisp
    (with-eval-after-load 'ert
      (ert-deftest oni:data-location ()
        "Test that `oni:data-location' returns the correct locations."
        (should (string= "~/.emacs.d/data/backup-files/"
                         (oni:data-location "backup-files/")))
        (should (string= "~/.emacs.d/data/auto-save-files/"
                         (oni:data-location "auto-save-files/")))
        (should (string= "~/.emacs.d/data/auto-save-list/.saves-"
                         (oni:data-location "auto-save-list/.saves-")))))
  #+END_SRC

* 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. 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

  Place the files which contain the 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

* Tabs

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

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

  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

* 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

* Whitespace

  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

  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

* 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

* Theme

  #+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

* 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 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 "\\`\\.")
  #+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 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 Conkeror 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-conkeror))
  #+END_SRC

* Minibuffer

  Enable paredit mode in the minibuffer.

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

* Minor modes

** 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
   C-j and RET keys. I prefer the original situation because my
   muscle-memory still remembers to use 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

** 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

** 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.

   #+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-known-projects-file
           (oni:data-location "projectile-bookmarks.eld"))
     (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

** 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

* Major modes

** Emacs lisp mode

   Enable paredit mode.

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

** Scheme mode

   Enable paredit mode.

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

   Add scsh to the list of known interpreters for scheme mode. This
   way shell-scripts that don't have a file extension but specify scsh
   as the interpreter are opened in scheme mode.

   #+BEGIN_SRC emacs-lisp
     (add-to-list 'interpreter-mode-alist '("scsh" . scheme-mode))
   #+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

** CSS mode

   Enable electric indent mode.

   #+BEGIN_SRC emacs-lisp
     (add-hook 'css-mode-hook 'electric-indent-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

   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.

   Provides minibuffer documentation for the code you're typing into
   the repl.

   #+BEGIN_SRC emacs-lisp
     (add-hook 'cider-mode-hook 'cider-turn-on-eldoc-mode)
   #+END_SRC

   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

* Applications

** Magit

   Magit is a very nice interface to Git for Emacs. It allows you to
   do just about anything with Git without leaving the comfort of your
   Emacs session.

   Show refined diffs in magit. This makes it much easier to see
   /what/ has changed on a line.

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

     (with-eval-after-load 'magit
       (setq magit-diff-refine-hunk 'all))
   #+END_SRC

** Gnus

   Gnus is one of the most extensible Email programs on the
   planet. And it's not even made for email but NNTP.

   Store all Gnus-related data in my data directory.

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

     (with-eval-after-load 'gnus
       (setq gnus-directory (oni:data-location "News")
             gnus-article-save-directory gnus-directory
             gnus-cache-directory gnus-directory
             gnus-kill-files-directory gnus-directory))
   #+END_SRC

   Store all Mail source-related data in my data directory.

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

     (with-eval-after-load 'mail-source
       (setq mail-source-directory (oni:data-location "Mail")))
   #+END_SRC

   Store all message-related data in the same place as the Mail source
   data.

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

     (with-eval-after-load 'message
       (setq message-directory (oni:data-location "Mail")))
   #+END_SRC

   Store all nnfolder-related data in the same place as the Mail
   source data.

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

     (with-eval-after-load 'nnfolder
       (setq nnfolder-directory (oni:data-location "Mail")))
   #+END_SRC

   Use msmtp to send mail.

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

     (with-eval-after-load 'sendmail
       (setq send-mail-function 'sendmail-send-it)
       (setq sendmail-program "/usr/bin/msmtp"))
   #+END_SRC

   Tell Gnus I'm not a novice anymore. One of the features of Gnus I
   use a lot is deleting messages and as long as Gnus thinks I'm a
   novice it will ask me if I'm sure every single time.

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

*** ryuslash.org

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

    #+BEGIN_SRC emacs-lisp
      (with-eval-after-load 'gnus
        (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
      (eval-when-compile (require 'gnus-msg))

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

*** picturefix

    Add my work email account as a secondary select method.

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

    When sending mail from the picturefix account, use the picturefix
    msmtp account and set the proper name and email address.

    #+BEGIN_SRC emacs-lisp
      (with-eval-after-load 'gnus-msg
        (add-to-list 'gnus-posting-styles
                     '("picturefix:"
                       (name "Tom Willemsen")
                       (address "tom@picturefix.nl")
                       (eval (setq message-sendmail-extra-arguments
                                   '("-a" "picturefix"))))))
    #+END_SRC

*** gmail

    Add my other personal email as a secondary select method.

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

** Circe

   I switched to Circe from ERC because I couldn't make the
   customizations I wanted to, Circe seems much better at this.

   Make sure that Emacs knows these function exist when the file is
   being compiled.

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

   I spend most of my time on IRC on Freenode.

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

     (with-eval-after-load 'circe
       (add-to-list 'circe-network-options
                    `("Freenode"
                      :nick "ryuslash"
                      :channels ("#emacs"
                                 "#mowedline"
                                 "#ninthfloor"
                                 "#dispass"
                                 "#linuxvoice"
                                 "#conkeror")
                      :nickserv-password
                      ,(oni-circe-get-password-for "irc.freenode.net"))))
   #+END_SRC

   Sometimes I watch some Twitch streams as well.

   #+BEGIN_SRC emacs-lisp
     (with-eval-after-load 'circe
       (add-to-list 'circe-network-options
                    `("Twitch"
                      :use-tls nil
                      :nick "ryuslash"
                      :host "irc.twitch.tv"
                      :pass ,(oni-circe-get-password-for "irc.twitch.tv")
                      :port 6667)))
   #+END_SRC

   Enable coloring of nicks.

   #+BEGIN_SRC emacs-lisp
     (with-eval-after-load 'circe
       (require 'circe-color-nicks)
       (enable-circe-color-nicks))
   #+END_SRC

   Align all nicks.

   #+BEGIN_SRC emacs-lisp
     (with-eval-after-load 'circe
       (require 'sermon)
       (enable-sermon))
   #+END_SRC

** Org

   Tell org-mode to fontify code blocks in their specified languages.

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

     (with-eval-after-load 'org
       (setq org-src-fontify-natively t))
   #+END_SRC

   Enable automatic text filling for org-mode.

   #+BEGIN_SRC emacs-lisp
     (add-hook 'org-mode-hook 'auto-fill-mode)
   #+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 %u "
           jabber-chat-local-prompt-format   "%t %u "
           jabber-chat-delayed-time-format   "%H:%M"
           jabber-groupchat-buffer-format    "++%n"
           jabber-groupchat-prompt-format    "%t %u ")
   #+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

* 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