lisp/iimage.el

   1 ;;; iimage.el --- Inline image minor mode.
   2
   3 ;; Copyright (C) 2004-2014 Free Software Foundation, Inc.
   4
   5 ;; Author: KOSEKI Yoshinori <kose@meadowy.org>
   6 ;; Maintainer: KOSEKI Yoshinori <kose@meadowy.org>
   7 ;; Keywords: multimedia
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;; Iimage is a minor mode that displays images, when image-filename
  27 ;; exists in the buffer.
  28 ;; http://www.netlaputa.ne.jp/~kose/Emacs/iimage.html
  29 ;;
  30 ;; ** Display images in *Info* buffer.
  31 ;;
  32 ;; (add-hook 'info-mode-hook 'iimage-mode)
  33 ;;
  34 ;; .texinfo:   @file{file://foo.png}
  35 ;; .info:      `file://foo.png'
  36 ;;
  37 ;; ** Display images in Wiki buffer.
  38 ;;
  39 ;; (add-hook 'wiki-mode-hook 'iimage-mode)
  40 ;;
  41 ;; wiki-file:   [[foo.png]]
  42
  43 ;;; Code:
  44
  45 (eval-when-compile
  46   (require 'image-file))
  47
  48 (defgroup iimage nil
  49   "Support for inline images."
  50   :version "22.1"
  51   :group 'image)
  52
  53 (defcustom iimage-mode-image-search-path nil
  54   "List of directories to search for image files for iimage-mode."
  55   :type '(choice (const nil) (repeat directory))
  56   :group 'iimage)
  57
  58 (defvar iimage-mode-image-filename-regex
  59   (concat "[-+./_0-9a-zA-Z]+\\."
  60           (regexp-opt (nconc (mapcar #'upcase
  61                                      image-file-name-extensions)
  62                              image-file-name-extensions)
  63                       t)))
  64
  65 (defcustom iimage-mode-image-regex-alist
  66   `((,(concat "\\(`?file://\\|\\[\\[\\|<\\|`\\)?"
  67               "\\(" iimage-mode-image-filename-regex "\\)"
  68               "\\(\\]\\]\\|>\\|'\\)?") . 2))
  69   "Alist of filename REGEXP vs NUM.
  70 Each element looks like (REGEXP . NUM).
  71 NUM specifies which parenthesized expression in the regexp.
  72
  73 Examples of image filename patterns to match:
  74     file://foo.png
  75     `file://foo.png'
  76     \\[\\[foo.gif]]
  77     <foo.png>
  78      foo.JPG
  79 "
  80   :type '(alist :key-type regexp :value-type integer)
  81   :group 'iimage)
  82
  83 (defvar iimage-mode-map
  84   (let ((map (make-sparse-keymap)))
  85     (define-key map "\C-l" 'iimage-recenter)
  86     map)
  87   "Keymap used in `iimage-mode'.")
  88
  89 (defun iimage-recenter (&optional arg)
  90   "Re-draw images and recenter."
  91   (interactive "P")
  92   (iimage-mode-buffer nil)
  93   (iimage-mode-buffer t)
  94   (recenter arg))
  95
  96 ;;;###autoload
  97 (define-obsolete-function-alias 'turn-on-iimage-mode 'iimage-mode "24.1")
  98
  99 (defun turn-off-iimage-mode ()
 100   "Unconditionally turn off iimage mode."
 101   (interactive)
 102   (iimage-mode 0))
 103
 104 (defun iimage-modification-hook (beg end)
 105   "Remove display property if a display region is modified."
 106   ;;(debug-print "ii1 begin %d, end %d\n" beg end)
 107   (let ((inhibit-modification-hooks t)
 108         (beg (previous-single-property-change end 'display
 109                                               nil (line-beginning-position)))
 110         (end (next-single-property-change     beg 'display
 111                                               nil (line-end-position))))
 112     (when (and beg end (plist-get (text-properties-at beg) 'display))
 113       ;;(debug-print "ii2 begin %d, end %d\n" beg end)
 114       (remove-text-properties beg end
 115                               '(display nil modification-hooks nil)))))
 116
 117 (defun iimage-mode-buffer (arg)
 118   "Display images if ARG is non-nil, undisplay them otherwise."
 119   (let ((image-path (cons default-directory iimage-mode-image-search-path))
 120         file)
 121     (with-silent-modifications
 122       (save-excursion
 123         (goto-char (point-min))
 124         (dolist (pair iimage-mode-image-regex-alist)
 125           (while (re-search-forward (car pair) nil t)
 126             (when (and (setq file (match-string (cdr pair)))
 127                        (setq file (locate-file file image-path)))
 128               ;; FIXME: we don't mark our images, so we can't reliably
 129               ;; remove them either (we may leave some of ours, and we
 130               ;; may remove other packages's display properties).
 131               (if arg
 132                   (add-text-properties (match-beginning 0) (match-end 0)
 133                                        `(display ,(create-image file)
 134                                          modification-hooks
 135                                          (iimage-modification-hook)))
 136                 (remove-text-properties (match-beginning 0) (match-end 0)
 137                                         '(display modification-hooks))))))))))
 138
 139 ;;;###autoload
 140 (define-minor-mode iimage-mode nil
 141   :group 'iimage :lighter " iImg" :keymap iimage-mode-map
 142   (iimage-mode-buffer iimage-mode))
 143
 144 (provide 'iimage)
 145
 146 ;;; iimage.el ends here