dotfiles/.emacs.d/emacs.org

#+TITLE: Emacs Configuration
#+STARTUP: indent

* Startup
** Disable the emacs startup screen.
#+name: startup
#+BEGIN_SRC emacs-lisp
  (setq inhibit-startup-screen +1)
#+END_SRC
* UI
** Theme
#+name: look-and-feel
#+BEGIN_SRC emacs-lisp
  (use-package solarized-theme
    :ensure t
    :init (load-theme 'solarized-dark 't))
#+END_SRC
** Helm
#+name: packages
#+BEGIN_SRC emacs-lisp
  (use-package helm
    :ensure t
    :diminish helm-mode
    :bind (("M-x" . helm-M-x)
           ("M-y" . helm-show-kill-ring)
           ("C-x b" . helm-mini)
           ("C-x C-b" . helm-buffers-list)
           ("C-x C-f" . helm-find-files)
           ("C-x C-r" . helm-recentf)
           ("C-x c o" . helm-occur)
           ("C-x c s" . helm-swoop))
    :config (progn
              (require 'helm-config)
              (helm-mode 1)
              (add-hook 'eshell-mode-hook
                        (lambda ()
                          (define-key eshell-mode-map (kbd "TAB") 'helm-esh-pcomplete)
                          (define-key eshell-mode-map (kbd "C-c C-l") 'helm-eshell-history)))))
#+END_SRC
*** helm-descbinds
#+name: packages
#+BEGIN_SRC emacs-lisp
  (use-package helm-descbinds
    :ensure t
    :bind (("C-h b" . helm-descbinds)
           ("C-h w" . helm-descbinds)))
#+END_SRC
*** helm-ag
Helm search plugin for [[Ag%20(The%20Silver%20Searcher)][Ag (The Silver Searcher)]]
#+name: packages
#+BEGIN_SRC emacs-lisp
    (use-package helm-ag
      :ensure t
      :defer t)
#+END_SRC
*** helm-projectile
Helm projectile integration
#+name: packages
#+BEGIN_SRC emacs-lisp
  (use-package helm-projectile
    :ensure t
    :defer t)
#+END_SRC
*** helm-flyspell
#+name: packages
#+begin_src emacs-lisp
  (use-package helm-flyspell
    :ensure t
    :commands helm-flyspell-correct
    :init (eval-after-load 'flyspell
            '(define-key flyspell-mode-map (kbd "C-;") 'helm-flyspell-correct)))
#+end_src
** Ace Jump
#+name: packages
#+BEGIN_SRC emacs-lisp
    (use-package ace-jump-mode
      :ensure t
      :defer t)
#+END_SRC
*** ace-isearch
#+name: packages
#+BEGIN_SRC emacs-lisp
  (use-package ace-isearch
    :ensure t
    :config (global-ace-isearch-mode t))
#+END_SRC
*** ace-window
#+name: packages
#+BEGIN_SRC emacs-lisp
  (use-package ace-window
    :ensure t
    :bind ("C-x o" . ace-window))    
#+END_SRC
** Guide Key
#+name: packages
#+BEGIN_SRC emacs-lisp
  (use-package guide-key
    :ensure t
    :diminish guide-key-mode
    :config (progn
              (setq guide-key/guide-key-sequence t)
              (guide-key-mode 1)))
#+END_SRC
** Expand Region
#+name: packages
#+BEGIN_SRC emacs-lisp
  (use-package expand-region
    :ensure t
    :bind ("C-=" . er/expand-region))
#+END_SRC
** Powerline
#+name: packages
#+BEGIN_SRC emacs-lisp
  (use-package powerline
    :ensure t
    :init (powerline-default-theme))
#+END_SRC
** Projectile
#+name: packages
#+BEGIN_SRC emacs-lisp
  (use-package projectile
    :ensure t
    :config (progn (setq projectile-mode-line
                         '(:eval (format " [%s]" (projectile-project-name))))
                   (require 'helm-projectile)
                   (helm-projectile-on)
                   (projectile-global-mode)))
#+END_SRC
* Coding
** Languages
*** Lisps
#+name: lisps
| Mode       | Description               |
|------------+---------------------------|
| lisp       | Common Lisp               |
| emacs-lisp | Emacs Lisp                |
| scheme     | Scheme                    |
| lfe        | Lisp-Flavored Erlang      |
| clojure    | Clojure                   |
| hy         | Hy (Lisp-flavored Python) |

#+name: programming
#+BEGIN_SRC emacs-lisp :noweb yes
  ;; SLIME
  (if (file-exists-p "~/quicklisp/slime-helper.el")
      (load (expand-file-name "~/quicklisp/slime-helper.el")))

  (setq inferior-lisp-program "clisp")

  (use-package paredit
    :ensure t)

  (use-package rainbow-identifiers
    :ensure t)

  (use-package rainbow-delimiters
    :ensure t)

  (let ((lisp-mode-hooks
         (mapcar (lambda (lisp)
                   (intern (concat lisp "-mode-hook")))
                 (mapcar 'car (cddr '<<lisps()>>)))))
    (mapc (lambda (hook)
            (message (format "Installing LISP mode hook for %S" hook))
            (add-hook hook (lambda ()
                             (show-paren-mode t)
                             (electric-indent-mode t)
                             (paredit-mode t)
                             (rainbow-delimiters-mode t)
                             (rainbow-identifiers-mode t))))
          (cons 'eval-expression-minibuffer-setup-hook
                lisp-mode-hooks)))
#+END_SRC
**** Lisp-Flavored Erlang
#+name: programming
#+BEGIN_SRC emacs-lisp
  (use-package lfe-mode
    :ensure t
    :mode "\\.lfe$")
#+END_SRC
**** Clojure
#+name: programming
#+BEGIN_SRC emacs-lisp
  (use-package clojure-mode
    :ensure t
    :mode (("\\.clj[sx]?$" . clojure-mode)
           ("\\.edn$" . clojure-mode)))
#+END_SRC
***** Cider
Communicates with the clojure REPL.
#+name: programming
#+BEGIN_SRC emacs-lisp
  (use-package cider
    :ensure t
    :commands (cider-jack-in cider))
#+END_SRC
**** Hy
#+name: programming
#+BEGIN_SRC emacs-lisp
  (use-package hy-mode
    :ensure t
    :mode "\\.hy$")
#+END_SRC
*** Erlang
A distributed, fault-tolerant functional language.
#+name: programming
#+BEGIN_SRC emacs-lisp
    (use-package erlang
      :ensure t
      :mode ("\.[eh]rl$" . erlang-mode)
      :config (add-hook 'erlang-mode-hook
                        (lambda ()
                          (setq inferior-erlang-machine-options '("-sname" "emacs"
                                                                  "-hidden")))))
#+END_SRC
*** Haskell
A strongly typed, pure functional language.
#+name: programming
#+BEGIN_SRC emacs-lisp
  (use-package haskell-mode
    :ensure t
    :mode "\.hs$")
#+END_SRC
*** PHP
#+name: programming
#+BEGIN_SRC emacs-lisp
  (use-package web-mode
    :ensure t
    :mode "\\.html?$")

  (use-package php-mode
    :ensure t
    :mode (("\\.php$" . php-mode)
           ("\\.inc$" . php-mode))
    :config (add-hook 'php-mode-hook (lambda ()
                                       "Customize PHP indentation"
                                       (c-set-offset 'arglist-cont-nonempty 'c-lineup-arglist)
                                       (c-set-offset 'substatement-open 0)
                                       (c-set-offset 'case-label '+))))
#+END_SRC
*** Python
#+name: programming
#+BEGIN_SRC emacs-lisp
  (use-package python-mode
    :ensure t
    :mode "\.py$")
#+END_SRC
**** Cython
#+name: programming
#+BEGIN_SRC emacs-lisp
  (use-package cython-mode
    :ensure t
    :mode "\.pyx$")
#+END_SRC
*** Ruby
#+name: programming
#+BEGIN_SRC emacs-lisp
  (use-package rvm
    :ensure t
    :config (rvm-use-default))
#+END_SRC
*** Yaml
#+name: programming
#+BEGIN_SRC emacs-lisp
  (use-package yaml-mode
    :ensure t
    :mode "\.yml$")
#+END_SRC
*** Docker
#+name: programming
#+BEGIN_SRC emacs-lisp
  (use-package dockerfile-mode
    :ensure t
    :mode "^Dockerfile$")
#+END_SRC
*** Graphviz
#+name: programming
#+BEGIN_SRC emacs-lisp
  (use-package graphviz-dot-mode
    :ensure t
    :mode "\.dot$")
#+END_SRC
** Tools
*** Autocomplete
#+name: autocomplete
#+BEGIN_SRC emacs-lisp
    (use-package auto-complete
      :ensure t
      :config
      (progn (global-auto-complete-mode t)
             (require 'auto-complete-config)
             (ac-config-default)
             (ac-set-trigger-key "TAB")
             (ac-set-trigger-key "<tab>")))
#+END_SRC
*** Flycheck
#+name: packages
#+BEGIN_SRC emacs-lisp
  (use-package flycheck
    :ensure t
    :init
    (add-hook 'after-init-hook #'global-flycheck-mode))
#+END_SRC
*** Web Mode
#+name: packages
#+BEGIN_SRC emacs-lisp
  (use-package web-mode
    :ensure t
    :mode ("\\.html$" . web-mode)
    :config (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
*** Yasnippet
#+name: packages
#+BEGIN_SRC emacs-lisp
  (use-package yasnippet
    :ensure t
    :diminish yas-minor-mode
    :config (yas-global-mode 1))
#+END_SRC
*** Ag (The Silver Searcher)
This is a code searching tool that replaces =ack=, and is an order of
magnitude faster.

#+name: packages
#+BEGIN_SRC emacs-lisp
  (use-package ag
    :ensure t
    :defer t)
#+END_SRC
** Libraries
*** Dash
A modern list api for Emacs. No 'cl required.

#+name: programming
#+BEGIN_SRC emacs-lisp
  (use-package dash
    :ensure t
    :config (dash-enable-font-lock))
#+END_SRC
* Writing
** Formats
*** Org
**** Modules
#+name: org-module-table
| org-habit |

#+name: packages
#+BEGIN_SRC emacs-lisp :noweb yes
  (let ((modules (mapcar (lambda (m) (intern (car m)))
                         '<<org-module-table()>>)))
    (mapcar (lambda (m) (add-to-list 'org-modules m))
            modules))
  (org-load-modules-maybe t)
#+END_SRC
**** Tasks
***** Keep logs in their own drawer
#+name: packages
#+BEGIN_SRC emacs-lisp
  (setq org-log-into-drawer t)
#+END_SRC
***** 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
**** Refiling
#+BEGIN_SRC emacs-lisp
  (setq org-refile-targets '((org-agenda-files . (:maxlevel . 6))))
#+END_SRC
**** Babel
***** Syntax highlighting
#+name: packages
#+BEGIN_SRC emacs-lisp
  (setq-default org-src-fontify-natively t)
#+END_SRC
***** Language evaluation

Org-babel evaluation will be turned on for the following
languages. Setting ~Confirm Evaluation~ to ~No~ disables the
[[http://orgmode.org/manual/Code-evaluation-security.html][security prompt]] for that language.

#+name: org-babel-languages
| Language     | Alias | Confirm Evaluation? | Description                     |
|--------------+-------+---------------------+---------------------------------|
| emacs-lisp   |       | Yes                 | Emacs Lisp                      |
| graphviz-dot | dot   | No                  | Directed and undirected graphs  |
| gnuplot      |       | No                  | Graphs                          |
| ditaa        |       | No                  | Ascii diagrams                  |
| plantuml     |       | No                  | Flow charts                     |
| mscgen       |       | No                  | Message sequence charts         |
| haskell      |       | Yes                 | A pure, functional language     |
| python       |       | Yes                 | A dynamic, all-purpose language |
| ruby         |       | Yes                 | A dynamic, all-purpose language |
| sh           |       | Yes                 | Shell scripts                   |

#+name: packages
#+BEGIN_SRC emacs-lisp :noweb yes
  (defvar my/org-babel-evaluated-languages ())
  (defvar my/org-src-lang-modes ())
  (defvar my/org-babel-no-confirm-languages ())

  (defun my/org-confirm-babel-evaluate (lang body)
    (not (member (intern lang) my/org-babel-no-confirm-languages)))

  (let ((language-table (cddr '<<org-babel-languages()>>)))
    (mapcar (lambda (lang-pair)
              (let* ((alias (if (not (string= (cadr lang-pair) "")) (cadr lang-pair)))
                     (lang (intern (car lang-pair)))
                     (lang-or-alias (if alias (intern alias) lang))
                     (confirm (not (string= (cl-caddr lang-pair) "No"))))
                (if alias
                    (add-to-list 'my/org-src-lang-modes (cons alias lang)))
                (if (not confirm)
                    (add-to-list 'my/org-babel-no-confirm-languages lang-or-alias))
                (add-to-list 'my/org-babel-evaluated-languages lang-or-alias)
                lang-or-alias))
            language-table))

  (mapcar (lambda (alias)
            (add-to-list 'org-src-lang-modes alias))
          my/org-src-lang-modes)

  (org-babel-do-load-languages
   'org-babel-load-languages
   (mapcar (lambda (lang)
             (cons lang t))
           my/org-babel-evaluated-languages))

  (setq org-confirm-babel-evaluate 'my/org-confirm-babel-evaluate)
#+END_SRC
*** LaTeX
**** AUCTeX
#+name: packages
#+BEGIN_SRC emacs-lisp
  (use-package tex-site
    :ensure auctex)
#+END_SRC
**** LaTeX-Extra
#+name: packages
#+BEGIN_SRC emacs-lisp
  (use-package latex-extra
    :ensure t
    :diminish latex-extra-mode
    :commands latex-extra-mode
    :init (add-hook 'LaTeX-mode-hook #'latex-extra-mode))
#+END_SRC
*** Markdown
#+name: packages
#+begin_src emacs-lisp
  (use-package markdown-mode
    :ensure t
    :mode "\\.md$")
#+end_src
** Tools
*** Flyspell
#+name: packages
#+BEGIN_SRC emacs-lisp
  (use-package flyspell
    :ensure t
    :commands flyspell-mode
    :diminish flyspell-mode
    :init (mapcar (lambda (mode-hook)
                    (add-to-list mode-hook #'flyspell-mode))
                  '(text-mode-hook
                    org-mode-hook)))
#+END_SRC
*** Unfill
Re-flowing paragraphs with =fill-paragraph= is nice, but there are
occasions when it's useful to do the inverse, and get rid of the line
breaks.

#+name: packages
#+BEGIN_SRC emacs-lisp
  (use-package unfill
    :ensure t
    :commands (unfill-paragraph
               unfill-region)
    :bind ("M-Q" . unfill-paragraph))
#+END_SRC
*** Writegood
#+name: packages
#+BEGIN_SRC emacs-lisp
  (use-package writegood-mode
   :ensure t
   :commands writegood-mode
   :diminish writegood-mode
   :init (mapcar (lambda (mode-hook)
                   (add-hook mode-hook #'writegood-mode))
                 '(text-mode-hook
                   org-mode-hook)))

#+END_SRC
* Mail
** BBDB
#+name: packages
#+BEGIN_SRC emacs-lisp
  (use-package bbdb
    :ensure t
    :init (progn (require 'bbdb)
                 (bbdb-initialize 'gnus 'message)
                 (bbdb-mua-auto-update-init 'gnus 'message)
                 (setq bbdb-message-all-addresses t)
                 (add-hook 'gnus-summary-mode-hook
                           (lambda ()
                             (define-key gnus-summary-mode-map
                               (kbd ";") 'bbdb-mua-edit-field)))))
#+END_SRC
** Gnus
#+name: packages
#+BEGIN_SRC emacs-lisp
  (use-package gnus
    :commands gnus
    :init (progn (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
* Publishing
** Htmlize
#+name: packages
#+BEGIN_SRC emacs-lisp
  (use-package htmlize
    :ensure t
    :defer t
    :commands (htmlize-region htmlize-buffer htmlize-file))
#+END_SRC
* Source Control
** Git-Gutter
#+name: packages
#+BEGIN_SRC emacs-lisp
  (use-package git-gutter
    :ensure t
    :diminish git-gutter-mode
    :config
    (progn
      (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
  (use-package magit
    :ensure t
    :diminish magit-auto-revert-mode
    :commands (magit-init
               magit-status
               magit-diff
               magit-commit)
    :config
    (progn
      (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))))

  (use-package magit-blame
    :ensure magit
    :commands (magit-blame-mode))
#+END_SRC
* Other functionality
** Disable tab indenting by default
#+name: other
#+BEGIN_SRC emacs-lisp
  (setq-default indent-tabs-mode nil)
#+END_SRC
** 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.

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

Disk space is cheap. Save lots.

#+name: other
#+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

#+name: other
#+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

#+name: other
#+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
** Prompt for 'y or n' instead of 'yes or no'
Because typing out "yes" and "no" is irritating.

#+name: other
#+BEGIN_SRC emacs-lisp
  (defalias 'yes-or-no-p #'y-or-n-p)
#+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.

I usually use this is a testing ground for new configuration before
adding it here, and also for any personal / sensitive configuration.

#+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.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.
  ;;;;

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