#+TITLE: Emacs Configuration

* Startup
  Disable the emacs startup screen.
  #+name: startup
  #+BEGIN_SRC emacs-lisp
    (setq inhibit-startup-screen +1)
  #+END_SRC
* Global key bindings
  #+name: global-keys
  #+BEGIN_SRC emacs-lisp
    (global-set-key (kbd "C-,") 'kill-whole-line)
  #+END_SRC
* Look and Feel
  #+name: look-and-feel
  #+BEGIN_SRC emacs-lisp
    (load-theme 'solarized-dark 't)
  #+END_SRC
* Autocomplete
  #+name: autocomplete
  #+BEGIN_SRC emacs-lisp
    (require 'auto-complete-config)
    (ac-config-default)
  #+END_SRC
* Package Configuration
** Ido
   #+name: packages
   #+BEGIN_SRC emacs-lisp
     (ido-mode +1)
     (setq ido-enable-flex-matching t)
   #+END_SRC
** Smex
   #+name: packages
   #+BEGIN_SRC emacs-lisp
     (global-set-key (kbd "M-x") 'smex)
     (global-set-key (kbd "M-X") 'smex-major-mode-commands)
   #+END_SRC
** Expand Region
   #+name: packages
   #+BEGIN_SRC emacs-lisp
     (global-set-key (kbd "C-=") 'er/expand-region)
   #+END_SRC
** Flycheck
   #+name: packages
   #+BEGIN_SRC emacs-lisp
     (add-hook 'after-init-hook #'global-flycheck-mode)
   #+END_SRC
** Git-Gutter
   #+name: packages
   #+BEGIN_SRC emacs-lisp
     (global-git-gutter-mode t)

     (defadvice ediff-make-temp-file (before make-temp-file-suspend-ll
                                             activate compile preactivate)
       "Disable git-gutter when running ediff"
       (global-git-gutter-mode 0))

     (add-hook 'ediff-cleanup-hook
               '(lambda ()
                  (global-git-gutter-mode t)))

   #+END_SRC
** Magit
   #+name: packages
   #+BEGIN_SRC emacs-lisp
     (defun magit-fullscreen ()
       (defadvice magit-status (around magit-fullscreen activate)
	 (window-configuration-to-register :magit-fullscreen)
	 ad-do-it
	 (delete-other-windows))

       (defadvice magit-quit-window (around magit-restore-screen activate)
	 ad-do-it
	 (jump-to-register :magit-fullscreen)))

     (eval-after-load 'magit '(magit-fullscreen))
   #+END_SRC
** Markdown
   #+name: packages
   #+BEGIN_SRC emacs-lisp
     (setq auto-mode-alist
           (cons '("\\.md" . markdown-mode) auto-mode-alist))
   #+END_SRC
** Org
*** Modules
    #+name: org-module-table
    | org-habit |

    #+name: packages
    #+BEGIN_SRC emacs-lisp :noweb yes
      (let ((modules (mapcar (lambda (m) (make-symbol (car m)))
                             '<<org-module-table()>>)))
        (mapcar (lambda (m) (add-to-list 'org-modules m))
                modules))
      (org-load-modules-maybe t)
    #+END_SRC
*** Tasks
**** Log completion
     #+name: packages
     #+BEGIN_SRC emacs-lisp
       (setq org-log-done 'time)
     #+END_SRC
**** Habits
     Shift the consistency graph over a bit to make room for task
     names.
     #+name: packages
     #+BEGIN_SRC emacs-lisp
       (setq org-habit-graph-column 70)
       (setq org-habit-show-habits-only-for-today nil)
     #+END_SRC
*** Babel
**** Syntax highlighting
     #+name: packages
     #+BEGIN_SRC emacs-lisp
       (setq-default org-src-fontify-natively t)
     #+END_SRC
**** Language evaluation
     #+name: packages
     #+BEGIN_SRC emacs-lisp
       (defvar my/org-babel-evaluated-languages
         '(emacs-lisp)
         "List of languages that may be evaluated in Org documents")

       <<org-babel-languages>>

       (org-babel-do-load-languages
        'org-babel-load-languages
        (mapcar (lambda (lang)
                  (cons lang t))
                my/org-babel-evaluated-languages))
     #+END_SRC
***** Graphviz
      #+name: org-babel-languages
      #+BEGIN_SRC emacs-lisp
        (add-to-list 'org-src-lang-modes (quote ("dot" . graphviz-dot)))

        (add-to-list 'my/org-babel-evaluated-languages 'dot)
      #+END_SRC
***** Ditaa
      #+name: org-babel-languages
      #+BEGIN_SRC emacs-lisp
        (add-to-list 'my/org-babel-evaluated-languages 'ditaa)
      #+END_SRC
***** PlantUML
      #+name: org-babel-languages
      #+BEGIN_SRC emacs-lisp
        (add-to-list 'my/org-babel-evaluated-languages 'plantuml)
      #+END_SRC
***** Mscgen
      A message sequence chart renderer.
      #+name: org-babel-languages
      #+BEGIN_SRC emacs-lisp
        (add-to-list 'my/org-babel-evaluated-languages 'mscgen)
      #+END_SRC
** Powerline
   #+name: packages
   #+BEGIN_SRC emacs-lisp
     (powerline-default-theme)
   #+END_SRC
** Projectile
   #+name: packages
   #+BEGIN_SRC emacs-lisp
     (projectile-global-mode)
   #+END_SRC
** Web Mode
   #+name: packages
   #+BEGIN_SRC emacs-lisp
     (add-hook 'web-mode-hook (lambda ()
                                (setq web-mode-markup-indent-offset 4)
                                (setq web-mode-css-indent-offset 4)
                                (setq web-mode-code-indent-offset 4)))
   #+END_SRC
** Gnus
   #+name: packages
   #+BEGIN_SRC emacs-lisp
     (defun my/configure-gnus ()
       <<gnus>>
       )

     (setq gnus-before-startup-hook 'my/configure-gnus)
   #+END_SRC
*** Avoid rich-text messages
    #+name: gnus
    #+BEGIN_SRC emacs-lisp
      (setq mm-discouraged-alternatives '("text/html" "text/richtext"))
    #+END_SRC
*** Summary view formatting
    Taken from http://groups.google.com/group/gnu.emacs.gnus/browse_thread/thread/a673a74356e7141f

    #+name: gnus
    #+BEGIN_SRC emacs-lisp
      (when window-system
        (setq gnus-sum-thread-tree-indent "  ")
        (setq gnus-sum-thread-tree-root "") ;; "● ")
        (setq gnus-sum-thread-tree-false-root "") ;; "◯ ")
        (setq gnus-sum-thread-tree-single-indent "") ;; "◎ ")
        (setq gnus-sum-thread-tree-vertical        "│")
        (setq gnus-sum-thread-tree-leaf-with-other "├─► ")
        (setq gnus-sum-thread-tree-single-leaf     "╰─► "))
      (setq gnus-summary-line-format
            (concat
             "%0{%U%R%z%}"
             "%3{│%}" "%1{%d%}" "%3{│%}" ;; date
             "  "
             "%4{%-20,20f%}"               ;; name
             "  "
             "%3{│%}"
             " "
             "%1{%B%}"
             "%s\n"))
      (setq gnus-summary-display-arrow t)
    #+END_SRC
*** Inline images
    #+name: gnus
    #+BEGIN_SRC emacs-lisp
      (add-to-list 'mm-attachment-override-types "image/.*")
      (setq mm-inline-large-images t)
    #+END_SRC
* Programming
** Lisps
   #+name: programming
   #+BEGIN_SRC emacs-lisp
     ;; SLIME
     (if (file-exists-p "~/quicklisp/slime-helper.el")
         (load (expand-file-name "~/quicklisp/slime-helper.el")))

     (setq inferior-lisp-program "clisp")

     (mapcar (lambda (mode-hook)
               (eval-after-load "paredit" `(add-hook ',mode-hook #'enable-paredit-mode))
               (eval-after-load "rainbow-delimiters" `(add-hook ',mode-hook #'rainbow-delimiters-mode))
               (eval-after-load "rainbow-identifiers" `(add-hook ',mode-hook #'rainbow-identifiers-mode))
               (add-hook mode-hook (lambda ()
                                (show-paren-mode)
                                (electric-indent-mode 1)
                                (paredit-mode 1)
                                (rainbow-delimiters-mode 1)
                                (rainbow-identifiers-mode 1)))
               )
             '(lisp-mode-hook
               emacs-lisp-mode-hook
               scheme-mode-hook
               lfe-mode-hook
               clojure-mode-hook))
   #+END_SRC
** Erlang
   #+name: programming
   #+BEGIN_SRC emacs-lisp
     (add-hook 'erlang-mode-hook
               (lambda ()
                 (setq inferior-erlang-machine-options '("-sname" "emacs"
                                                         "-hidden"))))
   #+END_SRC
** PHP
   #+name: programming
   #+BEGIN_SRC emacs-lisp
     (add-to-list 'auto-mode-alist '("\\.php$" . php-mode))
     (add-to-list 'auto-mode-alist '("\\.inc$" . php-mode))

     (defun my-php-mode-hook ()
       "Customize PHP indentation"

       (c-set-offset 'arglist-cont-nonempty 'c-lineup-arglist)
       (c-set-offset 'substatement-open 0)
       (c-set-offset 'case-label '+))

     (add-hook 'php-mode-hook 'my-php-mode-hook)
   #+END_SRC
** Ruby
   #+name: programming
   #+BEGIN_SRC emacs-lisp
     (require 'rvm)
     (rvm-use-default)
   #+END_SRC
* Other functionality
** Rename file and buffer
   Taken from [[http://emacsredux.com/blog/2013/05/04/rename-file-and-buffer/][Emacs Redux]]
   #+name: other
   #+BEGIN_SRC emacs-lisp
     ;; emacsredux.com
     (defun rename-file-and-buffer ()
       "Rename the current buffer and file it is visiting."
       (interactive)
       (let ((filename (buffer-file-name)))
	 (if (not (and filename (file-exists-p filename)))
	     (message "Buffer is not visiting a file!")
	   (let ((new-name (read-file-name "New name: " filename)))
	     (cond
	      ((vc-backend filename) (vc-rename-file filename new-name))
	      (t
	       (rename-file filename new-name t)
	       (rename-buffer new-name)
	       (set-visited-file-name new-name)
	       (set-buffer-modified-p nil)))))))
   #+END_SRC
** Eval and Replace
   Taken from [[http://emacsredux.com/blog/2013/06/21/eval-and-replace/][Emacs Redux]]
   #+name: other
   #+BEGIN_SRC emacs-lisp
     (defun eval-and-replace ()
       "Replace the preceding sexp with its value."
       (interactive)
       (backward-kill-sexp)
       (condition-case nil
           (prin1 (eval (read (current-kill 0)))
                  (current-buffer))
         (error (message "Invalid expression")
                (insert (current-kill 0)))))

     (global-set-key (kbd "C-)") 'eval-and-replace)
   #+END_SRC
** Smarter navigation to the beginning of a line
   Taken from [[http://emacsredux.com/blog/2013/05/22/smarter-navigation-to-the-beginning-of-a-line/][Emacs Redux]]
   #+name: other
   #+BEGIN_SRC emacs-lisp
     (defun smarter-move-beginning-of-line (arg)
       "Move point back to indentation of beginning of line.

     Move point to the first non-whitespace character on this line.
     If point is already there, move to the beginning of the line.
     Effectively toggle between the first non-whitespace character and
     the beginning of the line.

     If ARG is not nil or 1, move forward ARG - 1 lines first.  If
     point reaches the beginning or end of the buffer, stop there."
       (interactive "^p")
       (setq arg (or arg 1))

       ;; Move lines first
       (when (/= arg 1)
	 (let ((line-move-visual nil))
	   (forward-line (1- arg))))

       (let ((orig-point (point)))
	 (back-to-indentation)
	 (when (= orig-point (point))
	   (move-beginning-of-line 1))))

     ;; remap C-a to `smarter-move-beginning-of-line'
     (global-set-key [remap move-beginning-of-line]
		     'smarter-move-beginning-of-line)
   #+END_SRC
** Edit file with sudo
   Taken from [[http://www.emacswiki.org/TrampMode#toc32][EmacsWiki]]
   #+name: other
   #+BEGIN_SRC emacs-lisp
     (require 'dired)
     (defun sudo-edit-current-file ()
       (interactive)
       (let ((my-file-name) ; fill this with the file to open
             (position))    ; if the file is already open save position
         (if (equal major-mode 'dired-mode) ; test if we are in dired-mode 
             (progn
               (setq my-file-name (dired-get-file-for-visit))
               (find-alternate-file (prepare-tramp-sudo-string my-file-name)))
           (setq my-file-name (buffer-file-name); hopefully anything else is an already opened file
                 position (point))
           (find-alternate-file (prepare-tramp-sudo-string my-file-name))
           (goto-char position))))


     (defun prepare-tramp-sudo-string (tempfile)
       (if (file-remote-p tempfile)
           (let ((vec (tramp-dissect-file-name tempfile)))

             (tramp-make-tramp-file-name
              "sudo"
              (tramp-file-name-user nil)
              (tramp-file-name-host vec)
              (tramp-file-name-localname vec)
              (format "ssh:%s@%s|"
                      (tramp-file-name-user vec)
                      (tramp-file-name-host vec))))
         (concat "/sudo:root@localhost:" tempfile)))

     (define-key dired-mode-map [s-return] 'sudo-edit-current-file)
   #+END_SRC
** Backups
   Borrowed from Sacha Chua
   https://github.com/sachac/.emacs.d/

   This is one of the things people usually want to change right away. By default, Emacs saves backup files in the current directory. These are the files ending in =~= that are cluttering up your directory lists. The following code stashes them all in =~/.emacs.d/backups=, where I can find them with =C-x C-f= (=find-file=) if I really need to.

   #+begin_src emacs-lisp
     (setq backup-directory-alist '(("." . "~/.emacs.d/backups")))
   #+end_src

   Disk space is cheap. Save lots.

   #+begin_src emacs-lisp
     (setq delete-old-versions -1)
     (setq version-control t)
     (setq vc-make-backup-files t)
     (setq auto-save-file-name-transforms '((".*" "~/.emacs.d/auto-save-list/" t)))
   #+end_src
** History
   From http://www.wisdomandwonder.com/wordpress/wp-content/uploads/2014/03/C3F.html
   #+begin_src emacs-lisp
     (setq savehist-file "~/.emacs.d/savehist")
     (savehist-mode 1)
     (setq history-length t)
     (setq history-delete-duplicates t)
     (setq savehist-save-minibuffer-history 1)
     (setq savehist-additional-variables
           '(kill-ring
             search-ring
             regexp-search-ring))
   #+end_src
** Copy filename to clipboard

   http://emacsredux.com/blog/2013/03/27/copy-filename-to-the-clipboard/
   https://github.com/bbatsov/prelude

   #+begin_src emacs-lisp
     (defun prelude-copy-file-name-to-clipboard ()
       "Copy the current buffer file name to the clipboard."
       (interactive)
       (let ((filename (if (equal major-mode 'dired-mode)
                           default-directory
                         (buffer-file-name))))
         (when filename
           (kill-new filename)
           (message "Copied buffer file name '%s' to the clipboard." filename))))
   #+end_src
* Custom settings
  Store options set via =customize-*= in a separate file (Emacs stores
  them in =init.el= by default).
  
  #+name: custom-settings
  #+BEGIN_SRC emacs-lisp
    (setq custom-file "~/.emacs.d/custom.el")
    (if (file-exists-p custom-file)
        (load custom-file))
  #+END_SRC
* Auto-loading elisp files
  Any elisp files dropped into =~/.emacs.local.d/= will be
  automatically loaded.

  #+name: auto-load
  #+BEGIN_SRC emacs-lisp
    (defun my/load-elisp-directory (path)
      (let ((file-pattern "\\.elc?$"))
        (when (file-directory-p path)
          (mapcar (lambda (lisp-file)
                    (load-file lisp-file))
                  (directory-files (expand-file-name path) t file-pattern)))))

    (my/load-elisp-directory "~/.emacs.d/init.d")
    (my/load-elisp-directory "~/.emacs.local.d")
  #+END_SRC
* Configuration file layout
  
  Here I define the emacs.el file that gets generated by the code in
  this org file.
  
  #+BEGIN_SRC emacs-lisp :tangle yes :noweb no-export :exports code
    ;;;; Do not modify this file by hand.  It was automatically generated
    ;;;; from `emacs.org` in the same directory. See that file for more
    ;;;; information.
    ;;;;

    <<custom-settings>>
    <<look-and-feel>>
    <<autocomplete>>
    <<packages>>
    <<programming>>
    <<other>>
    <<auto-load>>
    <<startup>>
  #+END_SRC