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c7bd5d57 RS |
1 | ;;; image-mode.el --- support for visiting image files |
2 | ;; | |
3 | ;; Copyright (C) 2005 Free Software Foundation, Inc. | |
4 | ;; | |
5 | ;; Author: Richard Stallman <rms@gnu.org> | |
6 | ;; Keywords: multimedia | |
7 | ||
8 | ;; This file is part of GNU Emacs. | |
9 | ||
10 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
11 | ;; it under the terms of the GNU General Public License as published by | |
12 | ;; the Free Software Foundation; either version 2, or (at your option) | |
13 | ;; any later version. | |
14 | ||
15 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ;; GNU General Public License for more details. | |
19 | ||
20 | ;; You should have received a copy of the GNU General Public License | |
21 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
086add15 LK |
22 | ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
23 | ;; Boston, MA 02110-1301, USA. | |
c7bd5d57 RS |
24 | |
25 | ;;; Commentary: | |
26 | ||
27 | ;; Defines a major mode for visiting image files | |
28 | ;; that allows conversion between viewing the text of the file | |
29 | ;; and viewing the file as an image. Viewing the image | |
30 | ;; works by putting a `display' text-property on the | |
31 | ;; image data, with the image-data still present underneath; if the | |
32 | ;; resulting buffer file is saved to another name it will correctly save | |
33 | ;; the image data to the new file. | |
34 | ||
35 | ;;; Code: | |
36 | ||
37 | (require 'image) | |
38 | ||
d90e651e JL |
39 | ;;;###autoload (push '("\\.jpe?g\\'" . image-mode) auto-mode-alist) |
40 | ;;;###autoload (push '("\\.png\\'" . image-mode) auto-mode-alist) | |
41 | ;;;###autoload (push '("\\.gif\\'" . image-mode) auto-mode-alist) | |
42 | ;;;###autoload (push '("\\.tiff?\\'" . image-mode) auto-mode-alist) | |
43 | ;;;###autoload (push '("\\.p[bpgn]m\\'" . image-mode) auto-mode-alist) | |
44 | ;;;###autoload (push '("\\.x[bp]m\\'" . image-mode-maybe) auto-mode-alist) | |
c7bd5d57 RS |
45 | |
46 | (defvar image-mode-map | |
47 | (let ((map (make-sparse-keymap))) | |
48 | (define-key map "\C-c\C-c" 'image-toggle-display) | |
49 | map) | |
50 | "Major mode keymap for Image mode.") | |
51 | ||
52 | ;;;###autoload | |
53 | (defun image-mode () | |
54 | "Major mode for image files. | |
55 | You can use \\<image-mode-map>\\[image-toggle-display] | |
56 | to toggle between display as an image and display as text." | |
57 | (interactive) | |
58 | (kill-all-local-variables) | |
59 | (setq mode-name "Image") | |
60 | (setq major-mode 'image-mode) | |
61 | (use-local-map image-mode-map) | |
d90e651e JL |
62 | (add-hook 'change-major-mode-hook 'image-toggle-display-text nil t) |
63 | (if (not (get-text-property (point-min) 'display)) | |
64 | (image-toggle-display) | |
65 | ;; Set next vars when image is already displayed but local | |
66 | ;; variables were cleared by kill-all-local-variables | |
67 | (setq cursor-type nil truncate-lines t)) | |
c7bd5d57 | 68 | (run-mode-hooks 'image-mode-hook) |
d90e651e JL |
69 | (message (concat (substitute-command-keys |
70 | "Type \\[image-toggle-display] to view the image as ") | |
71 | (if (get-text-property (point-min) 'display) | |
72 | "text" "an image") "."))) | |
73 | ||
74 | ;;;###autoload | |
75 | (define-minor-mode image-minor-mode | |
76 | "Toggle Image minor mode. | |
77 | With arg, turn Image minor mode on if arg is positive, off otherwise. | |
78 | See the command `image-mode' for more information on this mode." | |
79 | nil " Image" image-mode-map | |
80 | :group 'image | |
81 | :version "22.1" | |
90d0be7d JL |
82 | (if (not image-minor-mode) |
83 | (image-toggle-display-text) | |
84 | (if (get-text-property (point-min) 'display) | |
85 | (setq cursor-type nil truncate-lines t)) | |
86 | (add-hook 'change-major-mode-hook (lambda () (image-minor-mode -1)) nil t) | |
87 | (message (concat (substitute-command-keys | |
88 | "Type \\[image-toggle-display] to view the image as ") | |
89 | (if (get-text-property (point-min) 'display) | |
90 | "text" "an image") ".")))) | |
d90e651e JL |
91 | |
92 | ;;;###autoload | |
93 | (defun image-mode-maybe () | |
94 | "Set major or minor mode for image files. | |
95 | Set Image major mode only when there are no other major modes | |
96 | associated with a filename in `auto-mode-alist'. When an image | |
97 | filename matches another major mode in `auto-mode-alist' then | |
98 | set that major mode and Image minor mode. | |
99 | ||
100 | See commands `image-mode' and `image-minor-mode' for more | |
101 | information on these modes." | |
102 | (interactive) | |
103 | (let* ((mode-alist | |
104 | (delq nil (mapcar | |
105 | (lambda (elt) | |
106 | (unless (memq (or (car-safe (cdr elt)) (cdr elt)) | |
107 | '(image-mode image-mode-maybe)) | |
108 | elt)) | |
109 | auto-mode-alist)))) | |
110 | (if (assoc-default buffer-file-name mode-alist 'string-match) | |
111 | (let ((auto-mode-alist mode-alist)) | |
112 | (set-auto-mode) | |
113 | (image-minor-mode t)) | |
114 | (image-mode)))) | |
115 | ||
116 | (defun image-toggle-display-text () | |
117 | "Showing the text of the image file." | |
118 | (if (get-text-property (point-min) 'display) | |
119 | (image-toggle-display))) | |
c7bd5d57 RS |
120 | |
121 | (defun image-toggle-display () | |
122 | "Start or stop displaying an image file as the actual image. | |
123 | This command toggles between showing the text of the image file | |
124 | and showing the image as an image." | |
125 | (interactive) | |
126 | (if (get-text-property (point-min) 'display) | |
127 | (let ((inhibit-read-only t) | |
837daa0d RS |
128 | (buffer-undo-list t) |
129 | (modified (buffer-modified-p))) | |
c7bd5d57 RS |
130 | (remove-list-of-text-properties (point-min) (point-max) |
131 | '(display intangible read-nonsticky | |
132 | read-only front-sticky)) | |
837daa0d | 133 | (set-buffer-modified-p modified) |
c7bd5d57 RS |
134 | (kill-local-variable 'cursor-type) |
135 | (kill-local-variable 'truncate-lines) | |
d90e651e JL |
136 | (if (called-interactively-p) |
137 | (message "Repeat this command to go back to displaying the image"))) | |
c7bd5d57 RS |
138 | ;; Turn the image data into a real image, but only if the whole file |
139 | ;; was inserted | |
140 | (let* ((data | |
141 | (string-make-unibyte | |
142 | (buffer-substring-no-properties (point-min) (point-max)))) | |
143 | (image | |
144 | (create-image data nil t)) | |
145 | (props | |
146 | `(display ,image | |
147 | intangible ,image | |
148 | rear-nonsticky (display intangible) | |
149 | ;; This a cheap attempt to make the whole buffer | |
150 | ;; read-only when we're visiting the file (as | |
151 | ;; opposed to just inserting it). | |
152 | read-only t front-sticky (read-only))) | |
d90e651e | 153 | (inhibit-read-only t) |
837daa0d RS |
154 | (buffer-undo-list t) |
155 | (modified (buffer-modified-p))) | |
c7bd5d57 | 156 | (add-text-properties (point-min) (point-max) props) |
837daa0d | 157 | (set-buffer-modified-p modified) |
c7bd5d57 RS |
158 | ;; Inhibit the cursor when the buffer contains only an image, |
159 | ;; because cursors look very strange on top of images. | |
160 | (setq cursor-type nil) | |
161 | ;; This just makes the arrow displayed in the right fringe | |
162 | ;; area look correct when the image is wider than the window. | |
163 | (setq truncate-lines t) | |
d90e651e JL |
164 | (if (called-interactively-p) |
165 | (message "Repeat this command to go back to displaying the file as text"))))) | |
c7bd5d57 RS |
166 | |
167 | (provide 'image-mode) | |
168 | ||
8f7ee639 | 169 | ;; arch-tag: b5b2b7e6-26a7-4b79-96e3-1546b5c4c6cb |
c7bd5d57 | 170 | ;;; image-mode.el ends here |