lisp/iimage.el

   1 ;;; iimage.el --- Inline image minor mode.
   2
   3 ;; Copyright (C) 2004, 2005 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 2, or (at your option)
  14 ;; 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; see the file COPYING.  If not, write to the
  23 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  24 ;; Boston, MA 02110-1301, USA.
  25
  26 ;;; Commentary:
  27
  28 ;; Iimage is a minor mode that displays images, when image-filename
  29 ;; exists in the buffer.
  30 ;; http://www.netlaputa.ne.jp/~kose/Emacs/iimage.html
  31 ;;
  32 ;; Add to your `~/.emacs':
  33 ;; (autoload 'iimage-mode "iimage" "Support Inline image minor mode." t)
  34 ;; (autoload 'turn-on-iimage-mode "iimage" "Turn on Inline image minor mode." t)
  35 ;;
  36 ;; ** Display images in *Info* buffer.
  37 ;;
  38 ;; (add-hook 'info-mode-hook 'turn-on-iimage-mode)
  39 ;;
  40 ;; .texinfo:   @file{file://foo.png}
  41 ;; .info:      `file://foo.png'
  42 ;;
  43 ;; ** Display images in Wiki buffer.
  44 ;;
  45 ;; (add-hook 'wiki-mode-hook 'turn-on-iimage-mode)
  46 ;;
  47 ;; wiki-file:   [[foo.png]]
  48
  49 ;;; Code:
  50
  51 (eval-when-compile
  52   (require 'image-file))
  53
  54 (defgroup iimage nil
  55   "Support for inline images."
  56   :version "22.1"
  57   :group 'image)
  58
  59 (defconst iimage-version "1.1")
  60 (defvar iimage-mode nil)
  61 (defvar iimage-mode-map nil)
  62
  63 ;; Set up key map.
  64 (unless iimage-mode-map
  65   (setq iimage-mode-map (make-sparse-keymap))
  66   (define-key iimage-mode-map "\C-l" 'iimage-recenter))
  67
  68 (defun iimage-recenter (&optional arg)
  69 "Re-draw images and recenter."
  70   (interactive "P")
  71   (iimage-mode-buffer 0)
  72   (iimage-mode-buffer 1)
  73   (recenter arg))
  74
  75 (defvar iimage-mode-image-filename-regex
  76   (concat "[-+./_0-9a-zA-Z]+\\."
  77           (regexp-opt (nconc (mapcar #'upcase
  78                                      image-file-name-extensions)
  79                              image-file-name-extensions)
  80                       t)))
  81
  82 (defvar iimage-mode-image-regex-alist
  83   `((,(concat "\\(`?file://\\|\\[\\[\\|<\\|`\\)?"
  84               "\\(" iimage-mode-image-filename-regex "\\)"
  85               "\\(\\]\\]\\|>\\|'\\)?") . 2))
  86 "*Alist of filename REGEXP vs NUM.
  87 Each element looks like (REGEXP . NUM).
  88 NUM specifies which parenthesized expression in the regexp.
  89
  90 image filename regex exsamples:
  91     file://foo.png
  92     `file://foo.png'
  93     \\[\\[foo.gif]]
  94     <foo.png>
  95      foo.JPG
  96 ")
  97
  98 (defvar iimage-mode-image-search-path nil
  99 "*List of directories to search for image files for iimage-mode.")
 100
 101 ;;;###autoload
 102 (defun turn-on-iimage-mode ()
 103 "Unconditionally turn on iimage mode."
 104   (interactive)
 105   (iimage-mode 1))
 106
 107 (defun turn-off-iimage-mode ()
 108 "Unconditionally turn off iimage mode."
 109   (interactive)
 110   (iimage-mode 0))
 111
 112 ;; Emacs21.3 or earlier does not heve locate-file.
 113 (if (fboundp 'locate-file)
 114     (defalias 'iimage-locate-file 'locate-file)
 115   (defun iimage-locate-file (filename path)
 116     (locate-library filename t path)))
 117
 118 (defun iimage-mode-buffer (arg)
 119 "Display/Undisplay Images.
 120 With numeric ARG, display the images if and only if ARG is positive."
 121   (interactive)
 122   (let ((ing (if (numberp arg)
 123                  (> arg 0)
 124                iimage-mode))
 125         (modp (buffer-modified-p (current-buffer)))
 126         file buffer-read-only)
 127     (save-excursion
 128       (goto-char (point-min))
 129       (dolist (pair iimage-mode-image-regex-alist)
 130         (while (re-search-forward (car pair) nil t)
 131           (if (and (setq file (match-string (cdr pair)))
 132                    (setq file (iimage-locate-file file
 133                                    (cons default-directory
 134                                          iimage-mode-image-search-path))))
 135               (if ing
 136                   (add-text-properties (match-beginning 0) (match-end 0)
 137                                        (list 'display (create-image file)))
 138                 (remove-text-properties (match-beginning 0) (match-end 0)
 139                                         '(display)))))))
 140     (set-buffer-modified-p modp)))
 141
 142 ;;;###autoload
 143 (define-minor-mode iimage-mode
 144   "Toggle inline image minor mode."
 145   :group 'iimage :lighter " iImg" :keymap iimage-mode-map
 146   (run-hooks 'iimage-mode-hook)
 147   (iimage-mode-buffer iimage-mode))
 148
 149 (provide 'iimage)
 150
 151 ;;; arch-tag: f6f8e29a-08f6-4a12-9496-51e67441ce65
 152 ;;; iimage.el ends here