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55535639 PJ |
1 | ;;; custom.el --- tools for declaring and initializing options |
2 | ;; | |
00644b82 | 3 | ;; Copyright (C) 1996, 1997, 1999, 2001, 2002 Free Software Foundation, Inc. |
55535639 PJ |
4 | ;; |
5 | ;; Author: Per Abrahamsen <abraham@dina.kvl.dk> | |
6 | ;; Maintainer: FSF | |
7 | ;; Keywords: help, faces | |
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., 59 Temple Place - Suite 330, | |
24 | ;; Boston, MA 02111-1307, USA. | |
25 | ||
26 | ;;; Commentary: | |
27 | ;; | |
28 | ;; This file only contain the code needed to declare and initialize | |
29 | ;; user options. The code to customize options is autoloaded from | |
30 | ;; `cus-edit.el' and is documented in the Emacs Lisp Reference manual. | |
31 | ||
32 | ;; The code implementing face declarations is in `cus-face.el' | |
33 | ||
34 | ;;; Code: | |
35 | ||
36 | (require 'widget) | |
37 | ||
38 | (defvar custom-define-hook nil | |
39 | ;; Customize information for this option is in `cus-edit.el'. | |
40 | "Hook called after defining each customize option.") | |
41 | ||
d3b80e9b SM |
42 | (defvar custom-current-group-alist nil |
43 | "Alist of (FILE . GROUP) indicating the current group to use for FILE.") | |
44 | ||
55535639 PJ |
45 | ;;; The `defcustom' Macro. |
46 | ||
47 | (defun custom-initialize-default (symbol value) | |
48 | "Initialize SYMBOL with VALUE. | |
49 | This will do nothing if symbol already has a default binding. | |
50 | Otherwise, if symbol has a `saved-value' property, it will evaluate | |
51 | the car of that and used as the default binding for symbol. | |
52 | Otherwise, VALUE will be evaluated and used as the default binding for | |
53 | symbol." | |
54 | (unless (default-boundp symbol) | |
55 | ;; Use the saved value if it exists, otherwise the standard setting. | |
56 | (set-default symbol (if (get symbol 'saved-value) | |
57 | (eval (car (get symbol 'saved-value))) | |
58 | (eval value))))) | |
59 | ||
60 | (defun custom-initialize-set (symbol value) | |
61 | "Initialize SYMBOL based on VALUE. | |
62 | If the symbol doesn't have a default binding already, | |
63 | then set it using its `:set' function (or `set-default' if it has none). | |
64 | The value is either the value in the symbol's `saved-value' property, | |
65 | if any, or VALUE." | |
66 | (unless (default-boundp symbol) | |
67 | (funcall (or (get symbol 'custom-set) 'set-default) | |
68 | symbol | |
69 | (if (get symbol 'saved-value) | |
70 | (eval (car (get symbol 'saved-value))) | |
71 | (eval value))))) | |
72 | ||
73 | (defun custom-initialize-reset (symbol value) | |
74 | "Initialize SYMBOL based on VALUE. | |
75 | Set the symbol, using its `:set' function (or `set-default' if it has none). | |
76 | The value is either the symbol's current value | |
77 | \(as obtained using the `:get' function), if any, | |
78 | or the value in the symbol's `saved-value' property if any, | |
79 | or (last of all) VALUE." | |
80 | (funcall (or (get symbol 'custom-set) 'set-default) | |
81 | symbol | |
82 | (cond ((default-boundp symbol) | |
83 | (funcall (or (get symbol 'custom-get) 'default-value) | |
84 | symbol)) | |
85 | ((get symbol 'saved-value) | |
86 | (eval (car (get symbol 'saved-value)))) | |
87 | (t | |
88 | (eval value))))) | |
89 | ||
90 | (defun custom-initialize-changed (symbol value) | |
91 | "Initialize SYMBOL with VALUE. | |
92 | Like `custom-initialize-reset', but only use the `:set' function if | |
93 | not using the standard setting. | |
94 | For the standard setting, use `set-default'." | |
95 | (cond ((default-boundp symbol) | |
96 | (funcall (or (get symbol 'custom-set) 'set-default) | |
97 | symbol | |
98 | (funcall (or (get symbol 'custom-get) 'default-value) | |
99 | symbol))) | |
100 | ((get symbol 'saved-value) | |
101 | (funcall (or (get symbol 'custom-set) 'set-default) | |
102 | symbol | |
103 | (eval (car (get symbol 'saved-value))))) | |
104 | (t | |
105 | (set-default symbol (eval value))))) | |
106 | ||
107 | (defun custom-declare-variable (symbol default doc &rest args) | |
108 | "Like `defcustom', but SYMBOL and DEFAULT are evaluated as normal arguments. | |
109 | DEFAULT should be an expression to evaluate to compute the default value, | |
110 | not the default value itself." | |
111 | ;; Remember the standard setting. | |
112 | (put symbol 'standard-value (list default)) | |
113 | ;; Maybe this option was rogue in an earlier version. It no longer is. | |
114 | (when (get symbol 'force-value) | |
115 | (put symbol 'force-value nil)) | |
116 | (when doc | |
117 | (put symbol 'variable-documentation doc)) | |
118 | (let ((initialize 'custom-initialize-reset) | |
119 | (requests nil)) | |
d3b80e9b SM |
120 | (unless (memq :group args) |
121 | (custom-add-to-group (custom-current-group) symbol 'custom-variable)) | |
55535639 PJ |
122 | (while args |
123 | (let ((arg (car args))) | |
124 | (setq args (cdr args)) | |
125 | (unless (symbolp arg) | |
126 | (error "Junk in args %S" args)) | |
127 | (let ((keyword arg) | |
128 | (value (car args))) | |
129 | (unless args | |
130 | (error "Keyword %s is missing an argument" keyword)) | |
131 | (setq args (cdr args)) | |
132 | (cond ((eq keyword :initialize) | |
133 | (setq initialize value)) | |
134 | ((eq keyword :set) | |
135 | (put symbol 'custom-set value)) | |
136 | ((eq keyword :get) | |
137 | (put symbol 'custom-get value)) | |
138 | ((eq keyword :require) | |
139 | (setq requests (cons value requests))) | |
140 | ((eq keyword :type) | |
141 | (put symbol 'custom-type (purecopy value))) | |
142 | ((eq keyword :options) | |
143 | (if (get symbol 'custom-options) | |
144 | ;; Slow safe code to avoid duplicates. | |
145 | (mapc (lambda (option) | |
146 | (custom-add-option symbol option)) | |
147 | value) | |
148 | ;; Fast code for the common case. | |
149 | (put symbol 'custom-options (copy-sequence value)))) | |
150 | (t | |
151 | (custom-handle-keyword symbol keyword value | |
152 | 'custom-variable)))))) | |
153 | (put symbol 'custom-requests requests) | |
154 | ;; Do the actual initialization. | |
155 | (funcall initialize symbol default)) | |
156 | (setq current-load-list (cons symbol current-load-list)) | |
157 | (run-hooks 'custom-define-hook) | |
158 | symbol) | |
159 | ||
160 | (defmacro defcustom (symbol value doc &rest args) | |
161 | "Declare SYMBOL as a customizable variable that defaults to VALUE. | |
162 | DOC is the variable documentation. | |
163 | ||
164 | Neither SYMBOL nor VALUE needs to be quoted. | |
165 | If SYMBOL is not already bound, initialize it to VALUE. | |
166 | The remaining arguments should have the form | |
167 | ||
168 | [KEYWORD VALUE]... | |
169 | ||
170 | The following keywords are meaningful: | |
171 | ||
172 | :type VALUE should be a widget type for editing the symbols value. | |
173 | :options VALUE should be a list of valid members of the widget type. | |
174 | :group VALUE should be a customization group. | |
175 | Add SYMBOL to that group. | |
3dc5f18e | 176 | :link LINK-DATA |
00644b82 EZ |
177 | Include an external link after the documentation string for this |
178 | item. This is a sentence containing an active field which | |
179 | references some other documentation. | |
180 | ||
181 | There are three alternatives you can use for LINK-DATA: | |
182 | ||
3dc5f18e | 183 | (custom-manual INFO-NODE) |
00644b82 | 184 | Link to an Info node; INFO-NODE is a string which specifies |
3dc5f18e | 185 | the node name, as in \"(emacs)Top\". The link appears as |
00644b82 EZ |
186 | `[manual]' in the customization buffer. |
187 | ||
3dc5f18e | 188 | (info-link INFO-NODE) |
00644b82 EZ |
189 | Like `custom-manual' except that the link appears in the |
190 | customization buffer with the Info node name. | |
191 | ||
3dc5f18e | 192 | (url-link URL) |
00644b82 EZ |
193 | Link to a web page; URL is a string which specifies the URL. |
194 | The link appears in the customization buffer as URL. | |
195 | ||
196 | You can specify the text to use in the customization buffer by | |
197 | adding `:tag NAME' after the first element of the LINK-DATA; for | |
3dc5f18e | 198 | example, (info-link :tag \"foo\" \"(emacs)Top\") makes a link to the |
00644b82 EZ |
199 | Emacs manual which appears in the buffer as `foo'. |
200 | ||
201 | An item can have more than one external link; however, most items | |
202 | have none at all. | |
55535639 PJ |
203 | :initialize |
204 | VALUE should be a function used to initialize the | |
205 | variable. It takes two arguments, the symbol and value | |
206 | given in the `defcustom' call. The default is | |
a01639a3 | 207 | `custom-initialize-reset'. |
55535639 PJ |
208 | :set VALUE should be a function to set the value of the symbol. |
209 | It takes two arguments, the symbol to set and the value to | |
210 | give it. The default choice of function is `custom-set-default'. | |
211 | :get VALUE should be a function to extract the value of symbol. | |
212 | The function takes one argument, a symbol, and should return | |
213 | the current value for that symbol. The default choice of function | |
214 | is `custom-default-value'. | |
215 | :require | |
216 | VALUE should be a feature symbol. If you save a value | |
217 | for this option, then when your `.emacs' file loads the value, | |
218 | it does (require VALUE) first. | |
219 | :version | |
220 | VALUE should be a string specifying that the variable was | |
221 | first introduced, or its default value was changed, in Emacs | |
222 | version VERSION. | |
00644b82 EZ |
223 | :tag LABEL |
224 | Use LABEL, a string, instead of the item's name, to label the item | |
225 | a in customization menus and buffers. | |
226 | :load FILE | |
227 | Load file FILE (a string) before displaying this customization | |
228 | item. Loading is done with `load-library', and only if the file is | |
229 | not already loaded. | |
a2b38e51 GM |
230 | :set-after VARIABLE |
231 | Specifies that SYMBOL should be set after VARIABLE when | |
232 | both have been customized. | |
55535639 PJ |
233 | |
234 | Read the section about customization in the Emacs Lisp manual for more | |
235 | information." | |
236 | ;; It is better not to use backquote in this file, | |
237 | ;; because that makes a bootstrapping problem | |
238 | ;; if you need to recompile all the Lisp files using interpreted code. | |
239 | (nconc (list 'custom-declare-variable | |
240 | (list 'quote symbol) | |
241 | (list 'quote value) | |
242 | doc) | |
243 | args)) | |
244 | ||
245 | ;;; The `defface' Macro. | |
246 | ||
247 | (defmacro defface (face spec doc &rest args) | |
248 | "Declare FACE as a customizable face that defaults to SPEC. | |
249 | FACE does not need to be quoted. | |
250 | ||
251 | Third argument DOC is the face documentation. | |
252 | ||
253 | If FACE has been set with `custom-set-face', set the face attributes | |
254 | as specified by that function, otherwise set the face attributes | |
255 | according to SPEC. | |
256 | ||
257 | The remaining arguments should have the form | |
258 | ||
259 | [KEYWORD VALUE]... | |
260 | ||
261 | The following KEYWORDs are defined: | |
262 | ||
263 | :group VALUE should be a customization group. | |
264 | Add FACE to that group. | |
265 | ||
266 | SPEC should be an alist of the form ((DISPLAY ATTS)...). | |
267 | ||
268 | The first element of SPEC where the DISPLAY matches the frame | |
269 | is the one that takes effect in that frame. The ATTRs in this | |
270 | element take effect; the other elements are ignored, on that frame. | |
271 | ||
272 | ATTS is a list of face attributes followed by their values: | |
273 | (ATTR VALUE ATTR VALUE...) | |
274 | ||
275 | The possible attributes are `:family', `:width', `:height', `:weight', | |
276 | `:slant', `:underline', `:overline', `:strike-through', `:box', | |
3d58b15e | 277 | `:foreground', `:background', `:stipple', `:inverse-video', and `:inherit'. |
55535639 PJ |
278 | |
279 | DISPLAY can either be the symbol t, which will match all frames, or an | |
280 | alist of the form \((REQ ITEM...)...). For the DISPLAY to match a | |
281 | FRAME, the REQ property of the frame must match one of the ITEM. The | |
282 | following REQ are defined: | |
283 | ||
284 | `type' (the value of `window-system') | |
285 | Under X, in addition to the values `window-system' can take, | |
286 | `motif', `lucid' and `x-toolkit' are allowed, and match when | |
287 | the Motif toolkit, Lucid toolkit, or any X toolkit is in use. | |
288 | ||
289 | `class' (the frame's color support) | |
290 | Should be one of `color', `grayscale', or `mono'. | |
291 | ||
292 | `background' (what color is used for the background text) | |
293 | Should be one of `light' or `dark'. | |
294 | ||
295 | Read the section about customization in the Emacs Lisp manual for more | |
296 | information." | |
297 | ;; It is better not to use backquote in this file, | |
298 | ;; because that makes a bootstrapping problem | |
299 | ;; if you need to recompile all the Lisp files using interpreted code. | |
300 | (nconc (list 'custom-declare-face (list 'quote face) spec doc) args)) | |
301 | ||
302 | ;;; The `defgroup' Macro. | |
303 | ||
d3b80e9b SM |
304 | (defun custom-current-group () |
305 | (cdr (assoc load-file-name custom-current-group-alist))) | |
306 | ||
55535639 PJ |
307 | (defun custom-declare-group (symbol members doc &rest args) |
308 | "Like `defgroup', but SYMBOL is evaluated as a normal argument." | |
309 | (while members | |
310 | (apply 'custom-add-to-group symbol (car members)) | |
311 | (setq members (cdr members))) | |
312 | (put symbol 'custom-group (nconc members (get symbol 'custom-group))) | |
313 | (when doc | |
314 | ;; This text doesn't get into DOC. | |
315 | (put symbol 'group-documentation (purecopy doc))) | |
316 | (while args | |
317 | (let ((arg (car args))) | |
318 | (setq args (cdr args)) | |
319 | (unless (symbolp arg) | |
320 | (error "Junk in args %S" args)) | |
321 | (let ((keyword arg) | |
322 | (value (car args))) | |
323 | (unless args | |
324 | (error "Keyword %s is missing an argument" keyword)) | |
325 | (setq args (cdr args)) | |
326 | (cond ((eq keyword :prefix) | |
327 | (put symbol 'custom-prefix value)) | |
328 | (t | |
329 | (custom-handle-keyword symbol keyword value | |
330 | 'custom-group)))))) | |
d3b80e9b SM |
331 | ;; Record the group on the `current' list. |
332 | (let ((elt (assoc load-file-name custom-current-group-alist))) | |
333 | (if elt (setcdr elt symbol) | |
334 | (push (cons load-file-name symbol) custom-current-group-alist))) | |
55535639 PJ |
335 | (run-hooks 'custom-define-hook) |
336 | symbol) | |
337 | ||
338 | (defmacro defgroup (symbol members doc &rest args) | |
339 | "Declare SYMBOL as a customization group containing MEMBERS. | |
340 | SYMBOL does not need to be quoted. | |
341 | ||
342 | Third arg DOC is the group documentation. | |
343 | ||
344 | MEMBERS should be an alist of the form ((NAME WIDGET)...) where | |
345 | NAME is a symbol and WIDGET is a widget for editing that symbol. | |
346 | Useful widgets are `custom-variable' for editing variables, | |
347 | `custom-face' for edit faces, and `custom-group' for editing groups. | |
348 | ||
349 | The remaining arguments should have the form | |
350 | ||
351 | [KEYWORD VALUE]... | |
352 | ||
353 | The following KEYWORDs are defined: | |
354 | ||
355 | :group VALUE should be a customization group. | |
356 | Add SYMBOL to that group. | |
357 | ||
358 | :version VALUE should be a string specifying that the group was introduced | |
359 | in Emacs version VERSION. | |
360 | ||
361 | Read the section about customization in the Emacs Lisp manual for more | |
362 | information." | |
363 | ;; It is better not to use backquote in this file, | |
364 | ;; because that makes a bootstrapping problem | |
365 | ;; if you need to recompile all the Lisp files using interpreted code. | |
366 | (nconc (list 'custom-declare-group (list 'quote symbol) members doc) args)) | |
367 | ||
368 | (defun custom-add-to-group (group option widget) | |
369 | "To existing GROUP add a new OPTION of type WIDGET. | |
370 | If there already is an entry for OPTION and WIDGET, nothing is done." | |
371 | (let ((members (get group 'custom-group)) | |
372 | (entry (list option widget))) | |
373 | (unless (member entry members) | |
374 | (put group 'custom-group (nconc members (list entry)))))) | |
375 | ||
376 | ;;; Properties. | |
377 | ||
378 | (defun custom-handle-all-keywords (symbol args type) | |
379 | "For customization option SYMBOL, handle keyword arguments ARGS. | |
380 | Third argument TYPE is the custom option type." | |
d3b80e9b SM |
381 | (unless (memq :group args) |
382 | (custom-add-to-group (custom-current-group) symbol 'custom-face)) | |
55535639 PJ |
383 | (while args |
384 | (let ((arg (car args))) | |
385 | (setq args (cdr args)) | |
386 | (unless (symbolp arg) | |
387 | (error "Junk in args %S" args)) | |
388 | (let ((keyword arg) | |
389 | (value (car args))) | |
390 | (unless args | |
391 | (error "Keyword %s is missing an argument" keyword)) | |
392 | (setq args (cdr args)) | |
393 | (custom-handle-keyword symbol keyword value type))))) | |
394 | ||
395 | (defun custom-handle-keyword (symbol keyword value type) | |
396 | "For customization option SYMBOL, handle KEYWORD with VALUE. | |
397 | Fourth argument TYPE is the custom option type." | |
398 | (if purify-flag | |
399 | (setq value (purecopy value))) | |
400 | (cond ((eq keyword :group) | |
401 | (custom-add-to-group value symbol type)) | |
402 | ((eq keyword :version) | |
403 | (custom-add-version symbol value)) | |
404 | ((eq keyword :link) | |
405 | (custom-add-link symbol value)) | |
406 | ((eq keyword :load) | |
407 | (custom-add-load symbol value)) | |
408 | ((eq keyword :tag) | |
409 | (put symbol 'custom-tag value)) | |
410 | ((eq keyword :set-after) | |
411 | (custom-add-dependencies symbol value)) | |
412 | (t | |
413 | (error "Unknown keyword %s" keyword)))) | |
414 | ||
415 | (defun custom-add-dependencies (symbol value) | |
416 | "To the custom option SYMBOL, add dependencies specified by VALUE. | |
417 | VALUE should be a list of symbols. For each symbol in that list, | |
418 | this specifies that SYMBOL should be set after the specified symbol, if | |
419 | both appear in constructs like `custom-set-variables'." | |
420 | (unless (listp value) | |
421 | (error "Invalid custom dependency `%s'" value)) | |
422 | (let* ((deps (get symbol 'custom-dependencies)) | |
423 | (new-deps deps)) | |
424 | (while value | |
425 | (let ((dep (car value))) | |
426 | (unless (symbolp dep) | |
427 | (error "Invalid custom dependency `%s'" dep)) | |
428 | (unless (memq dep new-deps) | |
429 | (setq new-deps (cons dep new-deps))) | |
430 | (setq value (cdr value)))) | |
431 | (unless (eq deps new-deps) | |
432 | (put symbol 'custom-dependencies new-deps)))) | |
433 | ||
434 | (defun custom-add-option (symbol option) | |
435 | "To the variable SYMBOL add OPTION. | |
436 | ||
437 | If SYMBOL is a hook variable, OPTION should be a hook member. | |
438 | For other types variables, the effect is undefined." | |
439 | (let ((options (get symbol 'custom-options))) | |
440 | (unless (member option options) | |
441 | (put symbol 'custom-options (cons option options))))) | |
442 | ||
443 | (defun custom-add-link (symbol widget) | |
444 | "To the custom option SYMBOL add the link WIDGET." | |
445 | (let ((links (get symbol 'custom-links))) | |
446 | (unless (member widget links) | |
447 | (put symbol 'custom-links (cons (purecopy widget) links))))) | |
448 | ||
449 | (defun custom-add-version (symbol version) | |
450 | "To the custom option SYMBOL add the version VERSION." | |
451 | (put symbol 'custom-version (purecopy version))) | |
452 | ||
453 | (defun custom-add-load (symbol load) | |
454 | "To the custom option SYMBOL add the dependency LOAD. | |
455 | LOAD should be either a library file name, or a feature name." | |
456 | (let ((loads (get symbol 'custom-loads))) | |
457 | (unless (member load loads) | |
458 | (put symbol 'custom-loads (cons (purecopy load) loads))))) | |
459 | ||
460 | ;;; Initializing. | |
461 | ||
462 | (defvar custom-local-buffer nil | |
463 | "Non-nil, in a Customization buffer, means customize a specific buffer. | |
464 | If this variable is non-nil, it should be a buffer, | |
465 | and it means customize the local bindings of that buffer. | |
466 | This variable is a permanent local, and it normally has a local binding | |
467 | in every Customization buffer.") | |
468 | (put 'custom-local-buffer 'permanent-local t) | |
469 | ||
470 | (defun custom-set-variables (&rest args) | |
471 | "Initialize variables according to user preferences. | |
472 | ||
473 | The arguments should be a list where each entry has the form: | |
474 | ||
475 | (SYMBOL VALUE [NOW [REQUEST [COMMENT]]]) | |
476 | ||
477 | The unevaluated VALUE is stored as the saved value for SYMBOL. | |
478 | If NOW is present and non-nil, VALUE is also evaluated and bound as | |
479 | the default value for the SYMBOL. | |
480 | REQUEST is a list of features we must require for SYMBOL. | |
481 | COMMENT is a comment string about SYMBOL." | |
482 | (setq args | |
483 | (sort args | |
484 | (lambda (a1 a2) | |
485 | (let* ((sym1 (car a1)) | |
486 | (sym2 (car a2)) | |
487 | (1-then-2 (memq sym1 (get sym2 'custom-dependencies))) | |
488 | (2-then-1 (memq sym2 (get sym1 'custom-dependencies)))) | |
489 | (cond ((and 1-then-2 2-then-1) | |
490 | (error "Circular custom dependency between `%s' and `%s'" | |
491 | sym1 sym2)) | |
492 | (1-then-2 t) | |
cb3f945f GM |
493 | (2-then-1 nil) |
494 | ;; Put symbols with :require last. The macro | |
495 | ;; define-minor-mode generates a defcustom | |
496 | ;; with a :require and a :set, where the | |
497 | ;; setter function calls the mode function. | |
498 | ;; Putting symbols with :require last ensures | |
499 | ;; that the mode function will see other | |
500 | ;; customized values rather than default | |
501 | ;; values. | |
be48584d | 502 | (t (nth 3 a2))))))) |
55535639 PJ |
503 | (while args |
504 | (let ((entry (car args))) | |
505 | (if (listp entry) | |
506 | (let* ((symbol (nth 0 entry)) | |
507 | (value (nth 1 entry)) | |
508 | (now (nth 2 entry)) | |
509 | (requests (nth 3 entry)) | |
510 | (comment (nth 4 entry)) | |
511 | set) | |
512 | (when requests | |
513 | (put symbol 'custom-requests requests) | |
514 | (mapc 'require requests)) | |
515 | (setq set (or (get symbol 'custom-set) 'custom-set-default)) | |
516 | (put symbol 'saved-value (list value)) | |
517 | (put symbol 'saved-variable-comment comment) | |
518 | ;; Allow for errors in the case where the setter has | |
519 | ;; changed between versions, say, but let the user know. | |
520 | (condition-case data | |
521 | (cond (now | |
522 | ;; Rogue variable, set it now. | |
523 | (put symbol 'force-value t) | |
524 | (funcall set symbol (eval value))) | |
525 | ((default-boundp symbol) | |
526 | ;; Something already set this, overwrite it. | |
527 | (funcall set symbol (eval value)))) | |
528 | (error | |
529 | (message "Error setting %s: %s" symbol data))) | |
530 | (setq args (cdr args)) | |
531 | (and (or now (default-boundp symbol)) | |
532 | (put symbol 'variable-comment comment))) | |
533 | ;; Old format, a plist of SYMBOL VALUE pairs. | |
534 | (message "Warning: old format `custom-set-variables'") | |
535 | (ding) | |
536 | (sit-for 2) | |
537 | (let ((symbol (nth 0 args)) | |
538 | (value (nth 1 args))) | |
539 | (put symbol 'saved-value (list value))) | |
540 | (setq args (cdr (cdr args))))))) | |
541 | ||
542 | (defun custom-set-default (variable value) | |
543 | "Default :set function for a customizable variable. | |
544 | Normally, this sets the default value of VARIABLE to VALUE, | |
545 | but if `custom-local-buffer' is non-nil, | |
546 | this sets the local binding in that buffer instead." | |
547 | (if custom-local-buffer | |
548 | (with-current-buffer custom-local-buffer | |
549 | (set variable value)) | |
550 | (set-default variable value))) | |
551 | ||
552 | ;;; The End. | |
553 | ||
554 | ;; Process the defcustoms for variables loaded before this file. | |
555 | (while custom-declare-variable-list | |
556 | (apply 'custom-declare-variable (car custom-declare-variable-list)) | |
557 | (setq custom-declare-variable-list (cdr custom-declare-variable-list))) | |
558 | ||
559 | (provide 'custom) | |
560 | ||
561 | ;;; custom.el ends here |