legacy-dotfiles/.emacs.d/functions.el

(defun quote-region ()
  (interactive)
  (let ((beginning (region-beginning))
        (end (region-end)))
    (save-excursion
      (goto-char end)
      (insert ?')
      (goto-char beginning)
      (insert ?'))))

(defun what-face (pos)
  "Find out which face the current position uses"
  (interactive "d")
  (let ((face (or (get-char-property (point) 'read-face-name)
                  (get-char-property (point) 'face))))
    (if face
        (message "Face: %s" face)
      (message "No face at %d" pos))))

(defun my-comp-finish-function (buf str)
  "Don't show compilation window if everything went ok"
  (if (string-match "exited abnormally" str)
      ;; there were errors
      (message "compilation errors, press C-x ` to visit")
    ;; no errors, make the compilation window go away in 0.5 seconds
    (run-at-time 0.5 nil 'delete-windows-on buf)
    (message "NO COMPILATION ERRORS!")))

(defun fullscreen ()
  "Fill the entire screen with emacs"
  (interactive)
  (x-send-client-message nil 0 nil "_NET_WM_STATE" 32
                         '(2 "_NET_WM_STATE_MAXIMIZED_VERT" 0))
  (x-send-client-message nil 0 nil "_NET_WM_STATE" 32
                         '(2 "_NET_WM_STATE_MAXIMIZED_HORZ" 0)))

(defun c-toggle-header-source ()
  "Toggle between a C source and header file"
  (interactive)
  (let ((ext (file-name-extension (buffer-file-name)))
        (noext (file-name-sans-extension (buffer-file-name))))
    (if (string= (substring ext 0 1) "c")
        (find-file (concat noext ".h"))
      (find-file (concat noext ".c")))))

(defun browse-to-current-file ()
  "Show current file in browser"
  (interactive)
  (browse-url buffer-file-name))

(defun comment-line ()
  "Toggle comment on a line"
  (interactive)
  (save-excursion
    (beginning-of-line)
    (insert "//")))

(defun add-php-keywords ()
  "Designed for c and c-style languages

Currently adds | & ! . + = - / % * , < > ? : ->"
  ;; Add ! at the beginning of font lock
  (font-lock-add-keywords
   'php-mode
   '(("\\([!]\\|\\=>\\)" 1 font-lock-operator-face)))
  ;; Add the rest at the end of font lock
  (font-lock-add-keywords
   'php-mode
   '(("\\(->\\|[|.+=&/%*,:?<>-]\\)" 1 font-lock-operator-face)
     ("\\(;\\)" 1 font-lock-end-statement)) 1))

(defun add-html-keywords ()
  "Designed for html, show some smarty tags"
  (font-lock-add-keywords
   'html-mode
   '(("{\\(\\*.*\\*\\)}" 1 font-comment-face)
     ("{\\/?\\(extends\\|block\\|foreach\\(else\\)?\\|if\\)"
      1 font-lock-builtin-face)
     ("\\$\\(\\(?:\\sw\\|\\s_\\)+\\)\\(?:|\\(\\(?:\\sw\\|\\s_\\)+\\):\\)"
      (1 font-lock-variable-name-face)
      (2 font-lock-function-name-face))
     ("\\$\\(\\(?:\\sw\\|\\s_\\)+\\)"
      1 font-lock-variable-name-face)
     ("{\\(\\(?:\\sw\\|\\s_\\)+\\).*}"
      1 font-lock-function-name-face))))

(defun buffer-major-mode (buffer-or-string)
  "Find out which major-mode is currently used"
  (with-current-buffer buffer-or-string major-mode))

(defun show-init-sections ()
  (interactive)
  (occur ";;\s +.*\s +;;")
  (other-window 1))

(defun list-functions ()
  (interactive)
  (occur
   "\\(?:\\(?:private\\|protected\\|public\\) \\)?function \\(?:\\sw\\)+(\\sw*)"))

(defun insert-init-title (title width)
  (interactive "stitle: \nnwidth: ")
  (insert-char ?\; width)
  (insert "\n;;")
  (insert-char ?\s (floor (/ (- (- width 4.0) (length title)) 2)))
  (insert title)
  (insert-char ?\s (ceiling (/ (- (- width 4.0) (length title)) 2)))
  (insert ";;\n")
  (insert-char ?\; width))

(defun replace-occurrences (from to)
  (save-excursion
    (goto-char (point-min))
    (while (search-forward from nil t)
      (replace-match to))))

(defun replace-html-special-chars ()
  (replace-occurrences "é" "&eacute;"))

(defun on-before-save ()
  (if (eq (buffer-major-mode (current-buffer)) 'html-mode)
      (replace-html-special-chars))
  (if (not (eq (buffer-major-mode (current-buffer)) 'markdown-mode))
      (delete-trailing-whitespace)))

(defun on-after-save ()
  (let ((fname (buffer-file-name)))
    (let ((suffix (file-name-extension fname)))
      (if (string-equal suffix "el")
          (byte-compile-file fname)))))

(defun on-prog-mode ()
  (font-lock-add-keywords
   nil
   '(("\\b\\(0[xX][0-9a-fA-F]+[lL]?\\|[0-9]+\\.?[0-9]*\\([eE][-+]?[0-9]+\\)?\\([lL]\\|[fF]\\|[dD]\\)?\\)\\b"
      0 font-lock-constant-face)
     ("\\b\\(\\.[0-9]+\\([eE][-+]?[0-9]+\\)?\\([lL]\\|[fF]\\|[dD]\\)?\\)\\b"
      0 font-lock-constant-face)))
  (rainbow-delimiters-mode)
  (pretty-lambdas))

(defun on-c-mode ()
  (local-set-key [f8]       'c-toggle-header-source)
  (local-set-key [f9]       'compile)
  (local-set-key [C-m]      'newline-and-indent)
  (local-set-key [C-return] 'newline))

(defun on-html-mode ()
  (local-set-key [f9] 'browse-to-current-file)
  (setq fill-column 73)
  (auto-fill-mode))

(defun pretty-lambdas ()
  (font-lock-add-keywords
   nil `(("(\\(lambda\\>\\)"
          (0 (progn
               (compose-region (match-beginning 1)
                               (match-end 1)
                               ?λ)))))))

;; http://emacs-fu.blogspot.com/2009/01/navigating-through-source-code-using.html
(defun djcb-gtags-create-or-update ()
  "create or update the gnu global tag file"
  (interactive)
  (if (not (= 0 (call-process "global" nil nil nil " -p"))) ; tagfile
      (let ((olddir default-directory)  ; doesn't exist?
            (topdir (read-directory-name
                     "gtags: top of source tree:" default-directory)))
        (cd topdir)
        (shell-command "gtags && echo 'created tagfile'")
        (cd olddir))                    ; restore
    ;; tagfile already exists; update it
    (shell-command "global -u && echo 'updated tagfile'")))