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112d54c1 | 1 | ;;; image-file.el --- support for visiting image files |
5859e61a | 2 | ;; |
65e70fc4 | 3 | ;; Copyright (C) 2000, 2001 Free Software Foundation, Inc. |
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4 | ;; |
5 | ;; Author: Miles Bader <miles@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 | |
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22 | ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
23 | ;; Boston, MA 02110-1301, USA. | |
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24 | |
25 | ;;; Commentary: | |
26 | ||
27 | ;; Defines a file-name-handler hook that transforms visited (or | |
112d54c1 | 28 | ;; inserted) image files so that they are displayed by Emacs as |
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29 | ;; images. This is done by putting a `display' text-property on the |
30 | ;; image data, with the image-data still present underneath; if the | |
31 | ;; resulting buffer file is saved to another name it will correctly save | |
32 | ;; the image data to the new file. | |
33 | ||
34 | ;;; Code: | |
35 | ||
36 | (require 'image) | |
37 | ||
75e5b373 | 38 | |
1c7e37a9 | 39 | ;;;###autoload |
75e5b373 | 40 | (defcustom image-file-name-extensions |
e0e6e9b8 | 41 | '("png" "jpeg" "jpg" "gif" "tiff" "tif" "xbm" "xpm" "pbm" "pgm" "ppm" "pnm") |
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42 | "*A list of image-file filename extensions. |
43 | Filenames having one of these extensions are considered image files, | |
44 | in addition to those matching `image-file-name-regexps'. | |
45 | ||
46 | See `auto-image-file-mode'; if `auto-image-file-mode' is enabled, | |
47 | setting this variable directly does not take effect unless | |
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48 | `auto-image-file-mode' is re-enabled; this happens automatically when |
49 | the variable is set using \\[customize]." | |
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50 | :type '(repeat string) |
51 | :set (lambda (sym val) | |
52 | (set-default sym val) | |
53 | (when auto-image-file-mode | |
54 | ;; Re-initialize the image-file handler | |
55 | (auto-image-file-mode t))) | |
5859e61a | 56 | :initialize 'custom-initialize-default |
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57 | :group 'image) |
58 | ||
1c7e37a9 | 59 | ;;;###autoload |
75e5b373 | 60 | (defcustom image-file-name-regexps nil |
34a19346 | 61 | "*List of regexps matching image-file filenames. |
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62 | Filenames matching one of these regexps are considered image files, |
63 | in addition to those with an extension in `image-file-name-extensions'. | |
5859e61a | 64 | |
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65 | See function `auto-image-file-mode'; if `auto-image-file-mode' is |
66 | enabled, setting this variable directly does not take effect unless | |
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67 | `auto-image-file-mode' is re-enabled; this happens automatically when |
68 | the variable is set using \\[customize]." | |
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69 | :type '(repeat regexp) |
70 | :set (lambda (sym val) | |
71 | (set-default sym val) | |
75e5b373 | 72 | (when auto-image-file-mode |
5859e61a | 73 | ;; Re-initialize the image-file handler |
75e5b373 | 74 | (auto-image-file-mode t))) |
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75 | :initialize 'custom-initialize-default |
76 | :group 'image) | |
77 | ||
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78 | |
79 | ;;;###autoload | |
80 | (defun image-file-name-regexp () | |
34a19346 | 81 | "Return a regular expression matching image-file filenames." |
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82 | (let ((exts-regexp |
83 | (and image-file-name-extensions | |
84 | (concat "\\." | |
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85 | (regexp-opt (nconc (mapcar #'upcase |
86 | image-file-name-extensions) | |
87 | image-file-name-extensions) | |
88 | t) | |
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89 | "\\'")))) |
90 | (if image-file-name-regexps | |
91 | (mapconcat 'identity | |
92 | (if exts-regexp | |
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93 | (cons exts-regexp image-file-name-regexps) |
94 | image-file-name-regexps) | |
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95 | "\\|") |
96 | exts-regexp))) | |
97 | ||
98 | ||
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99 | ;;;###autoload |
100 | (defun insert-image-file (file &optional visit beg end replace) | |
101 | "Insert the image file FILE into the current buffer. | |
102 | Optional arguments VISIT, BEG, END, and REPLACE are interpreted as for | |
103 | the command `insert-file-contents'." | |
104 | (let ((rval | |
105 | (image-file-call-underlying #'insert-file-contents-literally | |
106 | 'insert-file-contents | |
107 | file visit beg end replace))) | |
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108 | ;; Turn the image data into a real image, but only if the whole file |
109 | ;; was inserted | |
110 | (when (and (or (null beg) (zerop beg)) (null end)) | |
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111 | (let* ((ibeg (point)) |
112 | (iend (+ (point) (cadr rval))) | |
33155ffb | 113 | (visitingp (and visit (= ibeg (point-min)) (= iend (point-max)))) |
5859e61a | 114 | (data |
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115 | (string-make-unibyte |
116 | (buffer-substring-no-properties ibeg iend))) | |
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117 | (image |
118 | (create-image data nil t)) | |
119 | (props | |
120 | `(display ,image | |
121 | intangible ,image | |
a02b5bb4 | 122 | rear-nonsticky (display intangible) |
5859e61a | 123 | ;; This a cheap attempt to make the whole buffer |
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124 | ;; read-only when we're visiting the file (as |
125 | ;; opposed to just inserting it). | |
33155ffb | 126 | ,@(and visitingp |
5859e61a | 127 | '(read-only t front-sticky (read-only)))))) |
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128 | (add-text-properties ibeg iend props) |
129 | (when visitingp | |
130 | ;; Inhibit the cursor when the buffer contains only an image, | |
131 | ;; because cursors look very strange on top of images. | |
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132 | (setq cursor-type nil) |
133 | ;; This just makes the arrow displayed in the right fringe | |
134 | ;; area look correct when the image is wider than the window. | |
135 | (setq truncate-lines t)))) | |
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136 | rval)) |
137 | ||
15a420bd | 138 | (put 'image-file-handler 'safe-magic t) |
5859e61a | 139 | (defun image-file-handler (operation &rest args) |
34a19346 | 140 | "Filename handler for inserting image files. |
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141 | OPERATION is the operation to perform, on ARGS. |
142 | See `file-name-handler-alist' for details." | |
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143 | (if (and (eq operation 'insert-file-contents) |
144 | auto-image-file-mode) | |
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145 | (apply #'insert-image-file args) |
146 | ;; We don't handle OPERATION, use another handler or the default | |
147 | (apply #'image-file-call-underlying operation operation args))) | |
148 | ||
149 | (defun image-file-call-underlying (function operation &rest args) | |
150 | "Call FUNCTION with `image-file-handler' and OPERATION inhibited. | |
151 | Optional argument ARGS are the arguments to call FUNCTION with." | |
152 | (let ((inhibit-file-name-handlers | |
153 | (cons 'image-file-handler | |
154 | (and (eq inhibit-file-name-operation operation) | |
155 | inhibit-file-name-handlers))) | |
156 | (inhibit-file-name-operation operation)) | |
157 | (apply function args))) | |
158 | ||
5859e61a | 159 | |
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160 | ;;;###autoload |
161 | (define-minor-mode auto-image-file-mode | |
162 | "Toggle visiting of image files as images. | |
163 | With prefix argument ARG, turn on if positive, otherwise off. | |
164 | Returns non-nil if the new state is enabled. | |
165 | ||
166 | Image files are those whose name has an extension in | |
167 | `image-file-name-extensions', or matches a regexp in | |
168 | `image-file-name-regexps'." | |
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169 | :global t |
170 | :group 'image | |
171 | ;; Remove existing handler | |
172 | (let ((existing-entry | |
173 | (rassq 'image-file-handler file-name-handler-alist))) | |
174 | (when existing-entry | |
175 | (setq file-name-handler-alist | |
176 | (delq existing-entry file-name-handler-alist)))) | |
177 | ;; Add new handler, if enabled | |
178 | (when auto-image-file-mode | |
179 | (push (cons (image-file-name-regexp) 'image-file-handler) | |
180 | file-name-handler-alist))) | |
181 | ||
182 | ||
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183 | (provide 'image-file) |
184 | ||
ab5796a9 | 185 | ;;; arch-tag: 04cafe36-f7ba-4c80-9f47-4cb656520ce1 |
5859e61a | 186 | ;;; image-file.el ends here |