dotfiles/.emacs.d/emacs.org

#+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 'twilight '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
*** 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
* 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
* 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
* 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