code.delx.au - gnu-emacs-elpa/blob - packages/caps-lock/caps-lock.el

   1 ;;; caps-lock.el --- Caps-lock as a minor mode       -*- lexical-binding: t -*-
   2
   3 ;; Copyright (C) 2014  Free Software Foundation, Inc.
   4
   5 ;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
   6 ;; Version: 1.0
   7
   8 ;; This program is free software; you can redistribute it and/or modify
   9 ;; it under the terms of the GNU General Public License as published by
  10 ;; the Free Software Foundation, either version 3 of the License, or
  11 ;; (at your option) any later version.
  12
  13 ;; This program is distributed in the hope that it will be useful,
  14 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 ;; GNU General Public License for more details.
  17
  18 ;; You should have received a copy of the GNU General Public License
  19 ;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20
  21 ;;; Commentary:
  22
  23 ;;; Code:
  24
  25 (defvar caps-lock-commands
  26   '(self-insert-command isearch-printing-char)
  27   "List of commands that are subject to `caps-lock-mode'.")
  28
  29 ;;;###autoload
  30 (define-minor-mode caps-lock-mode
  31   "Make self-inserting keys invert the capitalization."
  32   :global t
  33   (if caps-lock-mode
  34       (add-hook 'pre-command-hook #'caps-lock--pch)
  35     (remove-hook 'pre-command-hook #'caps-lock--pch)))
  36
  37 (defun caps-lock--pch ()
  38   (when (and (characterp last-command-event)
  39              (or (memq this-command caps-lock-commands)
  40                  (eq this-command (key-binding [remap self-insert-command]))))
  41     (setq last-command-event
  42           (condition-case nil
  43               (let ((up (upcase last-command-event)))
  44                 (if (eq up last-command-event)
  45                     (downcase last-command-event)
  46                   up))
  47             (error last-command-event)))))
  48
  49 (provide 'caps-lock)
  50 ;;; caps-lock.el ends here