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1 | ;;; enriched.el --- read and save files in text/enriched format |
2 | ||
3 | ;; Copyright (c) 1994, 1995, 1996, 2002 Free Software Foundation, Inc. | |
4 | ||
5 | ;; Author: Boris Goldowsky <boris@gnu.org> | |
6 | ;; Keywords: wp, faces | |
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 | |
22 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | ;; Boston, MA 02111-1307, USA. | |
24 | ||
25 | ;;; Commentary: | |
26 | ||
27 | ;; This file implements reading, editing, and saving files with | |
28 | ;; text-properties such as faces, levels of indentation, and true line | |
29 | ;; breaks distinguished from newlines just used to fit text into the window. | |
30 | ||
31 | ;; The file format used is the MIME text/enriched format, which is a | |
32 | ;; standard format defined in internet RFC 1563. All standard annotations | |
33 | ;; are supported except for <smaller> and <bigger>, which are currently not | |
34 | ;; possible to display. | |
35 | ||
36 | ;; A separate file, enriched.doc, contains further documentation and other | |
37 | ;; important information about this code. It also serves as an example | |
38 | ;; file in text/enriched format. It should be in the etc directory of your | |
39 | ;; emacs distribution. | |
40 | ||
41 | ;;; Code: | |
42 | ||
43 | (provide 'enriched) | |
44 | ||
45 | ;;; | |
46 | ;;; Variables controlling the display | |
47 | ;;; | |
48 | ||
49 | (defgroup enriched nil | |
50 | "Read and save files in text/enriched format" | |
51 | :group 'wp) | |
52 | ||
53 | (defcustom enriched-verbose t | |
54 | "*If non-nil, give status messages when reading and writing files." | |
55 | :type 'boolean | |
56 | :group 'enriched) | |
57 | ||
58 | ;;; | |
59 | ;;; Set up faces & display table | |
60 | ;;; | |
61 | ||
62 | ;; Emacs doesn't have a "fixed" face by default, since all faces currently | |
63 | ;; have to be fixed-width. So we just pick one that looks different from the | |
64 | ;; default. | |
65 | (defface fixed | |
66 | '((t (:weight bold))) | |
67 | "Face used for text that must be shown in fixed width. | |
68 | Currently, emacs can only display fixed-width fonts, but this may change. | |
69 | This face is used for text specifically marked as fixed-width, for example | |
70 | in text/enriched files." | |
71 | :group 'enriched) | |
72 | ||
73 | (defface excerpt | |
74 | '((t (:slant italic))) | |
75 | "Face used for text that is an excerpt from another document. | |
76 | This is used in Enriched mode for text explicitly marked as an excerpt." | |
77 | :group 'enriched) | |
78 | ||
79 | (defconst enriched-display-table (or (copy-sequence standard-display-table) | |
80 | (make-display-table))) | |
81 | (aset enriched-display-table ?\f (make-vector (1- (frame-width)) ?-)) | |
82 | ||
83 | (defconst enriched-par-props '(left-margin right-margin justification) | |
84 | "Text-properties that usually apply to whole paragraphs. | |
85 | These are set front-sticky everywhere except at hard newlines.") | |
86 | ||
87 | ;;; | |
88 | ;;; Variables controlling the file format | |
89 | ;;; (bidirectional) | |
90 | ||
91 | (defconst enriched-initial-annotation | |
92 | (lambda () | |
93 | (format "Content-Type: text/enriched\nText-Width: %d\n\n" | |
94 | fill-column)) | |
95 | "What to insert at the start of a text/enriched file. | |
96 | If this is a string, it is inserted. If it is a list, it should be a lambda | |
97 | expression, which is evaluated to get the string to insert.") | |
98 | ||
99 | (defconst enriched-annotation-format "<%s%s>" | |
100 | "General format of enriched-text annotations.") | |
101 | ||
102 | (defconst enriched-annotation-regexp "<\\(/\\)?\\([-A-Za-z0-9]+\\)>" | |
103 | "Regular expression matching enriched-text annotations.") | |
104 | ||
105 | (defconst enriched-translations | |
106 | '((face (bold-italic "bold" "italic") | |
107 | (bold "bold") | |
108 | (italic "italic") | |
109 | (underline "underline") | |
110 | (fixed "fixed") | |
111 | (excerpt "excerpt") | |
112 | (default ) | |
113 | (nil enriched-encode-other-face)) | |
114 | (left-margin (4 "indent")) | |
115 | (right-margin (4 "indentright")) | |
116 | (justification (none "nofill") | |
117 | (right "flushright") | |
118 | (left "flushleft") | |
119 | (full "flushboth") | |
120 | (center "center")) | |
121 | (PARAMETER (t "param")) ; Argument of preceding annotation | |
122 | ;; The following are not part of the standard: | |
123 | (FUNCTION (enriched-decode-foreground "x-color") | |
124 | (enriched-decode-background "x-bg-color") | |
125 | (enriched-decode-display-prop "x-display")) | |
126 | (read-only (t "x-read-only")) | |
127 | (display (nil enriched-handle-display-prop)) | |
128 | (unknown (nil format-annotate-value)) | |
129 | ; (font-size (2 "bigger") ; unimplemented | |
130 | ; (-2 "smaller")) | |
131 | ) | |
132 | "List of definitions of text/enriched annotations. | |
133 | See `format-annotate-region' and `format-deannotate-region' for the definition | |
134 | of this structure.") | |
135 | ||
136 | (defconst enriched-ignore | |
137 | '(front-sticky rear-nonsticky hard) | |
138 | "Properties that are OK to ignore when saving text/enriched files. | |
139 | Any property that is neither on this list nor dealt with by | |
140 | `enriched-translations' will generate a warning.") | |
141 | ||
142 | ;;; Internal variables | |
143 | ||
144 | ||
145 | (defcustom enriched-mode-hook nil | |
146 | "Hook run after entering/leaving Enriched mode. | |
147 | If you set variables in this hook, you should arrange for them to be restored | |
148 | to their old values if you leave Enriched mode. One way to do this is to add | |
149 | them and their old values to `enriched-old-bindings'." | |
150 | :type 'hook | |
151 | :group 'enriched) | |
152 | ||
153 | (defvar enriched-old-bindings nil | |
154 | "Store old variable values that we change when entering mode. | |
155 | The value is a list of \(VAR VALUE VAR VALUE...).") | |
156 | (make-variable-buffer-local 'enriched-old-bindings) | |
157 | ||
158 | ;;; | |
159 | ;;; Define the mode | |
160 | ;;; | |
161 | ||
162 | (put 'enriched-mode 'permanent-local t) | |
163 | ;;;###autoload | |
164 | (define-minor-mode enriched-mode | |
165 | "Minor mode for editing text/enriched files. | |
166 | These are files with embedded formatting information in the MIME standard | |
167 | text/enriched format. | |
168 | Turning the mode on runs `enriched-mode-hook'. | |
169 | ||
170 | More information about Enriched mode is available in the file | |
171 | etc/enriched.doc in the Emacs distribution directory. | |
172 | ||
173 | Commands: | |
174 | ||
175 | \\{enriched-mode-map}" | |
176 | nil " Enriched" nil | |
177 | (cond ((null enriched-mode) | |
178 | ;; Turn mode off | |
179 | (setq buffer-file-format (delq 'text/enriched buffer-file-format)) | |
180 | ;; restore old variable values | |
181 | (while enriched-old-bindings | |
182 | (set (pop enriched-old-bindings) (pop enriched-old-bindings)))) | |
183 | ||
184 | ((memq 'text/enriched buffer-file-format) | |
185 | ;; Mode already on; do nothing. | |
186 | nil) | |
187 | ||
188 | (t ; Turn mode on | |
189 | (push 'text/enriched buffer-file-format) | |
190 | ;; Save old variable values before we change them. | |
191 | ;; These will be restored if we exit Enriched mode. | |
192 | (setq enriched-old-bindings | |
193 | (list 'buffer-display-table buffer-display-table | |
194 | 'indent-line-function indent-line-function | |
195 | 'default-text-properties default-text-properties)) | |
196 | (make-local-variable 'indent-line-function) | |
197 | (make-local-variable 'default-text-properties) | |
198 | (setq indent-line-function 'indent-to-left-margin ;WHY?? -sm | |
199 | buffer-display-table enriched-display-table) | |
200 | (use-hard-newlines 1 nil) | |
201 | (let ((sticky (plist-get default-text-properties 'front-sticky)) | |
202 | (p enriched-par-props)) | |
203 | (dolist (x p) | |
204 | (add-to-list 'sticky x)) | |
205 | (if sticky | |
206 | (setq default-text-properties | |
207 | (plist-put default-text-properties | |
208 | 'front-sticky sticky))))))) | |
209 | ||
210 | ;;; | |
211 | ;;; Keybindings | |
212 | ;;; | |
213 | ||
214 | (defvar enriched-mode-map nil | |
215 | "Keymap for Enriched mode.") | |
216 | ||
217 | (if (null enriched-mode-map) | |
218 | (fset 'enriched-mode-map (setq enriched-mode-map (make-sparse-keymap)))) | |
219 | ||
220 | (if (not (assq 'enriched-mode minor-mode-map-alist)) | |
221 | (setq minor-mode-map-alist | |
222 | (cons (cons 'enriched-mode enriched-mode-map) | |
223 | minor-mode-map-alist))) | |
224 | ||
225 | (define-key enriched-mode-map "\C-a" 'beginning-of-line-text) | |
226 | (define-key enriched-mode-map "\C-m" 'reindent-then-newline-and-indent) | |
227 | (define-key enriched-mode-map "\C-j" 'reindent-then-newline-and-indent) | |
228 | (define-key enriched-mode-map "\M-j" 'facemenu-justification-menu) | |
229 | (define-key enriched-mode-map "\M-S" 'set-justification-center) | |
230 | (define-key enriched-mode-map "\C-x\t" 'increase-left-margin) | |
231 | (define-key enriched-mode-map "\C-c\C-l" 'set-left-margin) | |
232 | (define-key enriched-mode-map "\C-c\C-r" 'set-right-margin) | |
233 | ||
234 | ;;; | |
235 | ;;; Some functions dealing with text-properties, especially indentation | |
236 | ;;; | |
237 | ||
238 | (defun enriched-map-property-regions (prop func &optional from to) | |
239 | "Apply a function to regions of the buffer based on a text property. | |
240 | For each contiguous region of the buffer for which the value of PROPERTY is | |
241 | eq, the FUNCTION will be called. Optional arguments FROM and TO specify the | |
242 | region over which to scan. | |
243 | ||
244 | The specified function receives three arguments: the VALUE of the property in | |
245 | the region, and the START and END of each region." | |
246 | (save-excursion | |
247 | (save-restriction | |
248 | (if to (narrow-to-region (point-min) to)) | |
249 | (goto-char (or from (point-min))) | |
250 | (let ((begin (point)) | |
251 | end | |
252 | (marker (make-marker)) | |
253 | (val (get-text-property (point) prop))) | |
254 | (while (setq end (text-property-not-all begin (point-max) prop val)) | |
255 | (move-marker marker end) | |
256 | (funcall func val begin (marker-position marker)) | |
257 | (setq begin (marker-position marker) | |
258 | val (get-text-property marker prop))) | |
259 | (if (< begin (point-max)) | |
260 | (funcall func val begin (point-max))))))) | |
261 | ||
262 | (put 'enriched-map-property-regions 'lisp-indent-hook 1) | |
263 | ||
264 | (defun enriched-insert-indentation (&optional from to) | |
265 | "Indent and justify each line in the region." | |
266 | (save-excursion | |
267 | (save-restriction | |
268 | (if to (narrow-to-region (point-min) to)) | |
269 | (goto-char (or from (point-min))) | |
270 | (if (not (bolp)) (forward-line 1)) | |
271 | (while (not (eobp)) | |
272 | (if (eolp) | |
273 | nil ; skip blank lines | |
274 | (indent-to (current-left-margin)) | |
275 | (justify-current-line t nil t)) | |
276 | (forward-line 1))))) | |
277 | ||
278 | ;;; | |
279 | ;;; Encoding Files | |
280 | ;;; | |
281 | ||
282 | ;;;###autoload | |
283 | (defun enriched-encode (from to orig-buf) | |
284 | (if enriched-verbose (message "Enriched: encoding document...")) | |
285 | (save-restriction | |
286 | (narrow-to-region from to) | |
287 | (delete-to-left-margin) | |
288 | (unjustify-region) | |
289 | (goto-char from) | |
290 | (format-replace-strings '(("<" . "<<"))) | |
291 | (format-insert-annotations | |
292 | (format-annotate-region from (point-max) enriched-translations | |
293 | 'enriched-make-annotation enriched-ignore)) | |
294 | (goto-char from) | |
295 | (insert (if (stringp enriched-initial-annotation) | |
296 | enriched-initial-annotation | |
297 | (save-excursion | |
298 | ;; Eval this in the buffer we are annotating. This | |
299 | ;; fixes a bug which was saving incorrect File-Width | |
300 | ;; information, since we were looking at local | |
301 | ;; variables in the wrong buffer. | |
302 | (if orig-buf (set-buffer orig-buf)) | |
303 | (funcall enriched-initial-annotation)))) | |
304 | (enriched-map-property-regions 'hard | |
305 | (lambda (v b e) | |
306 | (if (and v (= ?\n (char-after b))) | |
307 | (progn (goto-char b) (insert "\n")))) | |
308 | (point) nil) | |
309 | (if enriched-verbose (message nil)) | |
310 | ;; Return new end. | |
311 | (point-max))) | |
312 | ||
313 | (defun enriched-make-annotation (internal-ann positive) | |
314 | "Format an annotation INTERNAL-ANN. | |
315 | INTERNAL-ANN may be a string, for a flag, or a list of the form (PARAM VALUE). | |
316 | If POSITIVE is non-nil, this is the opening annotation; | |
317 | if nil, the matching close." | |
318 | (cond ((stringp internal-ann) | |
319 | (format enriched-annotation-format (if positive "" "/") internal-ann)) | |
320 | ;; Otherwise it is an annotation with parameters, represented as a list | |
321 | (positive | |
322 | (let ((item (car internal-ann)) | |
323 | (params (cdr internal-ann))) | |
324 | (concat (format enriched-annotation-format "" item) | |
325 | (mapconcat (lambda (i) (concat "<param>" i "</param>")) | |
326 | params "")))) | |
327 | (t (format enriched-annotation-format "/" (car internal-ann))))) | |
328 | ||
329 | (defun enriched-encode-other-face (old new) | |
330 | "Generate annotations for random face change. | |
331 | One annotation each for foreground color, background color, italic, etc." | |
332 | (cons (and old (enriched-face-ans old)) | |
333 | (and new (enriched-face-ans new)))) | |
334 | ||
335 | (defun enriched-face-ans (face) | |
336 | "Return annotations specifying FACE. | |
337 | FACE may be a list of faces instead of a single face; | |
338 | it can also be anything allowed as an element of a list | |
339 | which can be the value of the `face' text property." | |
340 | (cond ((and (consp face) (eq (car face) 'foreground-color)) | |
341 | (list (list "x-color" (cdr face)))) | |
342 | ((and (consp face) (eq (car face) 'background-color)) | |
343 | (list (list "x-bg-color" (cdr face)))) | |
344 | ((and (listp face) (eq (car face) :foreground)) | |
345 | (list (list "x-color" (cadr face)))) | |
346 | ((and (listp face) (eq (car face) :background)) | |
347 | (list (list "x-bg-color" (cadr face)))) | |
348 | ((listp face) | |
349 | (apply 'append (mapcar 'enriched-face-ans face))) | |
350 | ((let* ((fg (face-attribute face :foreground)) | |
351 | (bg (face-attribute face :background)) | |
352 | (props (face-font face t)) | |
353 | (ans (cdr (format-annotate-single-property-change | |
354 | 'face nil props enriched-translations)))) | |
355 | (unless (eq fg 'unspecified) | |
356 | (setq ans (cons (list "x-color" fg) ans))) | |
357 | (unless (eq bg 'unspecified) | |
358 | (setq ans (cons (list "x-bg-color" bg) ans))) | |
359 | ans)))) | |
360 | ||
361 | ;;; | |
362 | ;;; Decoding files | |
363 | ;;; | |
364 | ||
365 | ;;;###autoload | |
366 | (defun enriched-decode (from to) | |
367 | (if enriched-verbose (message "Enriched: decoding document...")) | |
368 | (use-hard-newlines 1 'never) | |
369 | (save-excursion | |
370 | (save-restriction | |
371 | (narrow-to-region from to) | |
372 | (goto-char from) | |
373 | ||
374 | ;; Deal with header | |
375 | (let ((file-width (enriched-get-file-width))) | |
376 | (enriched-remove-header) | |
377 | ||
378 | ;; Deal with newlines | |
379 | (while (search-forward-regexp "\n\n+" nil t) | |
380 | (if (current-justification) | |
381 | (delete-char -1)) | |
382 | (set-hard-newline-properties (match-beginning 0) (point))) | |
383 | ||
384 | ;; Translate annotations | |
385 | (format-deannotate-region from (point-max) enriched-translations | |
386 | 'enriched-next-annotation) | |
387 | ||
388 | ;; Indent or fill the buffer | |
389 | (cond (file-width ; File was filled to this width | |
390 | (setq fill-column file-width) | |
391 | (if enriched-verbose (message "Indenting...")) | |
392 | (enriched-insert-indentation)) | |
393 | (t ; File was not filled. | |
394 | (if enriched-verbose (message "Filling paragraphs...")) | |
395 | (fill-region (point-min) (point-max)))) | |
396 | (if enriched-verbose (message nil))) | |
397 | (point-max)))) | |
398 | ||
399 | (defun enriched-next-annotation () | |
400 | "Find and return next text/enriched annotation. | |
401 | Any \"<<\" strings encountered are converted to \"<\". | |
402 | Return value is \(begin end name positive-p), or nil if none was found." | |
403 | (while (and (search-forward "<" nil 1) | |
404 | (progn (goto-char (match-beginning 0)) | |
405 | (not (looking-at enriched-annotation-regexp)))) | |
406 | (forward-char 1) | |
407 | (if (= ?< (char-after (point))) | |
408 | (delete-char 1) | |
409 | ;; A single < that does not start an annotation is an error, | |
410 | ;; which we note and then ignore. | |
411 | (message "Warning: malformed annotation in file at %s" | |
412 | (1- (point))))) | |
413 | (if (not (eobp)) | |
414 | (let* ((beg (match-beginning 0)) | |
415 | (end (match-end 0)) | |
416 | (name (downcase (buffer-substring | |
417 | (match-beginning 2) (match-end 2)))) | |
418 | (pos (not (match-beginning 1)))) | |
419 | (list beg end name pos)))) | |
420 | ||
421 | (defun enriched-get-file-width () | |
422 | "Look for file width information on this line." | |
423 | (save-excursion | |
424 | (if (search-forward "Text-Width: " (+ (point) 1000) t) | |
425 | (read (current-buffer))))) | |
426 | ||
427 | (defun enriched-remove-header () | |
428 | "Remove file-format header at point." | |
429 | (while (looking-at "^[-A-Za-z]+: .*\n") | |
430 | (delete-region (point) (match-end 0))) | |
431 | (if (looking-at "^\n") | |
432 | (delete-char 1))) | |
433 | ||
434 | (defun enriched-decode-foreground (from to &optional color) | |
435 | (if color | |
436 | (list from to 'face (list ':foreground color)) | |
437 | (message "Warning: no color specified for <x-color>") | |
438 | nil)) | |
439 | ||
440 | (defun enriched-decode-background (from to &optional color) | |
441 | (if color | |
442 | (list from to 'face (list ':background color)) | |
443 | (message "Warning: no color specified for <x-bg-color>") | |
444 | nil)) | |
445 | \f | |
446 | ;;; Handling the `display' property. | |
447 | ||
448 | ||
449 | (defun enriched-handle-display-prop (old new) | |
450 | "Return a list of annotations for a change in the `display' property. | |
451 | OLD is the old value of the property, NEW is the new value. Value | |
452 | is a list `(CLOSE OPEN)', where CLOSE is a list of annotations to | |
453 | close and OPEN a list of annotations to open. Each of these lists | |
454 | has the form `(ANNOTATION PARAM ...)'." | |
455 | (let ((annotation "x-display") | |
456 | (param (prin1-to-string (or old new)))) | |
457 | (if (null old) | |
458 | (cons nil (list (list annotation param))) | |
459 | (cons (list (list annotation param)) nil)))) | |
460 | ||
461 | (defun enriched-decode-display-prop (start end &optional param) | |
462 | "Decode a `display' property for text between START and END. | |
463 | PARAM is a `<param>' found for the property. | |
464 | Value is a list `(START END SYMBOL VALUE)' with START and END denoting | |
3592613a | 465 | the range of text to assign text property SYMBOL with value VALUE." |
5e046f6d JB |
466 | (let ((prop (when (stringp param) |
467 | (condition-case () | |
468 | (car (read-from-string param)) | |
469 | (error nil))))) | |
470 | (unless prop | |
471 | (message "Warning: invalid <x-display> parameter %s" param)) | |
472 | (list start end 'display prop))) | |
473 | ||
474 | ;;; enriched.el ends here |