summaryrefslogtreecommitdiff
path: root/lisp/cus-theme.el
blob: 197d9787d9ab15e9558652d5d66d9a1d93128f64 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
;;; cus-theme.el -- custom theme creation user interface
;;
;; Copyright (C) 2001, 2002, 2003, 2004, 2005,
;;   2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
;;
;; Author: Alex Schroeder <alex@gnu.org>
;; Maintainer: FSF
;; Keywords: help, faces
;; Package: emacs

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

;;; Code:

(require 'widget)
(require 'cus-edit)

(eval-when-compile
  (require 'wid-edit))

(defvar custom-new-theme-mode-map
  (let ((map (make-keymap)))
    (set-keymap-parent map widget-keymap)
    (suppress-keymap map)
    (define-key map "\C-x\C-s" 'custom-theme-write)
    (define-key map "n" 'widget-forward)
    (define-key map "p" 'widget-backward)
    map)
  "Keymap for `custom-new-theme-mode'.")

(define-derived-mode custom-new-theme-mode nil "Cus-Theme"
  "Major mode for editing Custom themes.
Do not call this mode function yourself.  It is meant for internal use."
  (use-local-map custom-new-theme-mode-map)
  (custom--initialize-widget-variables)
  (set (make-local-variable 'revert-buffer-function) 'custom-theme-revert))
(put 'custom-new-theme-mode 'mode-class 'special)

(defvar custom-theme-name nil)
(defvar custom-theme-variables nil)
(defvar custom-theme-faces nil)
(defvar custom-theme-description nil)
(defvar custom-theme-insert-variable-marker nil)
(defvar custom-theme-insert-face-marker nil)

(defvar custom-theme--listed-faces '(default cursor fixed-pitch
  variable-pitch escape-glyph minibuffer-prompt highlight region
  shadow secondary-selection trailing-whitespace
  font-lock-builtin-face font-lock-comment-delimiter-face
  font-lock-comment-face font-lock-constant-face
  font-lock-doc-face font-lock-function-name-face
  font-lock-keyword-face font-lock-negation-char-face
  font-lock-preprocessor-face font-lock-regexp-grouping-backslash
  font-lock-regexp-grouping-construct font-lock-string-face
  font-lock-type-face font-lock-variable-name-face
  font-lock-warning-face button link link-visited fringe
  header-line tooltip mode-line mode-line-buffer-id
  mode-line-emphasis mode-line-highlight mode-line-inactive
  isearch isearch-fail lazy-highlight match next-error
  query-replace)
  "Faces listed by default in the *Custom Theme* buffer.")

(defvar custom-theme--save-name)

;;;###autoload
(defun customize-create-theme (&optional theme buffer)
  "Create or edit a custom theme.
THEME, if non-nil, should be an existing theme to edit.
BUFFER, if non-nil, should be a buffer to use."
  (interactive)
  (switch-to-buffer (get-buffer-create (or buffer "*Custom Theme*")))
  ;; Save current faces
  (let ((inhibit-read-only t))
    (erase-buffer))
  (custom-new-theme-mode)
  (make-local-variable 'custom-theme-name)
  (set (make-local-variable 'custom-theme--save-name) theme)
  (set (make-local-variable 'custom-theme-faces) nil)
  (set (make-local-variable 'custom-theme-variables) nil)
  (set (make-local-variable 'custom-theme-description) "")
  (make-local-variable 'custom-theme-insert-face-marker)
  (make-local-variable 'custom-theme-insert-variable-marker)
  (make-local-variable 'custom-theme--listed-faces)

  (widget-create 'push-button
		 :tag " Visit Theme "
		 :help-echo "Insert the settings of a pre-defined theme."
		 :action (lambda (widget &optional event)
			   (call-interactively 'custom-theme-visit-theme)))
  (widget-insert "  ")
  (widget-create 'push-button
		 :tag " Merge Theme "
		 :help-echo "Merge in the settings of a pre-defined theme."
		 :action (lambda (widget &optional event)
			   (call-interactively 'custom-theme-merge-theme)))
  (widget-insert "  ")
  (widget-create 'push-button :notify 'revert-buffer " Revert ")

  (widget-insert "\n\nTheme name : ")
  (setq custom-theme-name
	(widget-create 'editable-field
		       :value (if theme (symbol-name theme) "")))
  (widget-insert "Description: ")
  (setq custom-theme-description
	(widget-create 'text
		       :value (format-time-string "Created %Y-%m-%d.")))
  (widget-insert "             ")
  (widget-create 'push-button
     		 :notify (function custom-theme-write)
     		 " Save Theme ")
  ;; Face widgets
  (widget-insert "\n\n  Theme faces:\n")
  (let (widget)
    (dolist (face custom-theme--listed-faces)
      (widget-insert "  ")
      (setq widget (widget-create 'custom-face
				  :documentation-shown t
				  :tag (custom-unlispify-tag-name face)
				  :value face
				  :display-style 'concise
				  :custom-state 'hidden
				  :sample-indent 34))
      (custom-magic-reset widget)
      (push (cons face widget) custom-theme-faces)))
  (insert " ")
  (setq custom-theme-insert-face-marker (point-marker))
  (insert " ")
  (widget-create 'push-button
		 :tag "Insert Additional Face"
		 :help-echo "Add another face to this theme."
		 :follow-link 'mouse-face
		 :button-face 'custom-link
		 :mouse-face 'highlight
		 :pressed-face 'highlight
		 :action (lambda (widget &optional event)
			   (call-interactively 'custom-theme-add-face)))
  (widget-insert "\n\n  Theme variables:\n ")
  (setq custom-theme-insert-variable-marker (point-marker))
  (widget-insert ?\s)
  (widget-create 'push-button
		 :tag "Insert Variable"
		 :help-echo "Add another variable to this theme."
		 :follow-link 'mouse-face
		 :button-face 'custom-link
		 :mouse-face 'highlight
		 :pressed-face 'highlight
		 :action (lambda (widget &optional event)
			   (call-interactively 'custom-theme-add-variable)))
  (widget-insert ?\n)
  (if theme
      (custom-theme-merge-theme theme))
  (widget-setup)
  (goto-char (point-min))
  (message ""))

(defun custom-theme-revert (ignore-auto noconfirm)
  (when (or noconfirm (y-or-n-p "Discard current changes? "))
    (customize-create-theme custom-theme--save-name (current-buffer))))

;;; Theme variables

(defun custom-theme-add-variable (symbol)
  (interactive "vVariable name: ")
  (cond ((assq symbol custom-theme-variables)
	 (message "%s is already in the theme" (symbol-name symbol)))
	((not (boundp symbol))
	 (message "%s is not defined as a variable" (symbol-name symbol)))
	((eq symbol 'custom-enabled-themes)
	 (message "Custom theme cannot contain `custom-enabled-themes'"))
	(t
	 (save-excursion
	   (goto-char custom-theme-insert-variable-marker)
	   (widget-insert " ")
	   (let ((widget (widget-create 'custom-variable
					:tag (custom-unlispify-tag-name symbol)
					:custom-level 0
					:action 'custom-theme-variable-action
					:custom-state 'unknown
					:value symbol)))
	     (push (cons symbol widget) custom-theme-variables)
	     (custom-magic-reset widget))
	   (widget-insert " ")
	   (move-marker custom-theme-insert-variable-marker (point))
	   (widget-setup)))))

(defvar custom-theme-variable-menu
  `(("Reset to Current" custom-redraw
     (lambda (widget)
       (and (boundp (widget-value widget))
	    (memq (widget-get widget :custom-state)
		  '(themed modified changed)))))
    ("Reset to Theme Value" custom-variable-reset-theme
     (lambda (widget)
       (let ((theme  (intern (widget-value custom-theme-name)))
	     (symbol (widget-value widget))
	     found)
	 (and (custom-theme-p theme)
	      (dolist (setting (get theme 'theme-settings) found)
	 	(if (and (eq (cadr setting) symbol)
	 		 (eq (car  setting) 'theme-value))
	 	    (setq found t)))))))
    ("---" ignore ignore)
    ("Delete" custom-theme-delete-variable nil))
  "Alist of actions for the `custom-variable' widget in Custom Theme Mode.
See the documentation for `custom-variable'.")

(defun custom-theme-variable-action (widget &optional event)
  "Show the Custom Theme Mode menu for a `custom-variable' widget.
Optional EVENT is the location for the menu."
  (let ((custom-variable-menu custom-theme-variable-menu))
    (custom-variable-action widget event)))

(defun custom-variable-reset-theme (widget)
  "Reset WIDGET to its value for the currently edited theme."
  (let ((theme  (intern (widget-value custom-theme-name)))
	(symbol (widget-value widget))
	found)
    (dolist (setting (get theme 'theme-settings))
      (if (and (eq (cadr setting) symbol)
	       (eq (car  setting) 'theme-value))
	  (setq found setting)))
    (widget-value-set (car (widget-get widget :children))
		      (nth 3 found)))
  (widget-put widget :custom-state 'themed)
  (custom-redraw-magic widget)
  (widget-setup))

(defun custom-theme-delete-variable (widget)
  (setq custom-theme-variables
	(assq-delete-all (widget-value widget) custom-theme-variables))
  (widget-delete widget))

;;; Theme faces

(defun custom-theme-add-face (symbol)
  (interactive (list (read-face-name "Face name" nil nil)))
  (cond ((assq symbol custom-theme-faces)
	 (message "%s is already in the theme" (symbol-name symbol)))
	((not (facep symbol))
	 (message "%s is not defined as a face" (symbol-name symbol)))
	(t
	 (save-excursion
	   (goto-char custom-theme-insert-face-marker)
	   (widget-insert " ")
	   (let ((widget (widget-create 'custom-face
					:tag (custom-unlispify-tag-name symbol)
					:custom-level 0
					:action 'custom-theme-face-action
					:custom-state 'unknown
					:display-style 'concise
					:sample-indent 34
					:value symbol)))
	     (push (cons symbol widget) custom-theme-faces)
	     (custom-magic-reset widget)
	     (widget-insert " ")
	     (move-marker custom-theme-insert-face-marker (point))
	     (widget-setup))))))

(defvar custom-theme-face-menu
  `(("Reset to Theme Value" custom-face-reset-theme
     (lambda (widget)
       (let ((theme  (intern (widget-value custom-theme-name)))
	     (symbol (widget-value widget))
	     found)
	 (and (custom-theme-p theme)
	      (dolist (setting (get theme 'theme-settings) found)
	 	(if (and (eq (cadr setting) symbol)
	 		 (eq (car  setting) 'theme-face))
	 	    (setq found t)))))))
    ("---" ignore ignore)
    ("Delete" custom-theme-delete-face nil))
  "Alist of actions for the `custom-variable' widget in Custom Theme Mode.
See the documentation for `custom-variable'.")

(defun custom-theme-face-action (widget &optional event)
  "Show the Custom Theme Mode menu for a `custom-face' widget.
Optional EVENT is the location for the menu."
  (let ((custom-face-menu custom-theme-face-menu))
    (custom-face-action widget event)))

(defun custom-face-reset-theme (widget)
  "Reset WIDGET to its value for the currently edited theme."
  (let ((theme  (intern (widget-value custom-theme-name)))
	(symbol (widget-value widget))
	found)
    (dolist (setting (get theme 'theme-settings))
      (if (and (eq (cadr setting) symbol)
	       (eq (car  setting) 'theme-face))
	  (setq found setting)))
    (widget-value-set (car (widget-get widget :children))
		      (nth 3 found)))
  (widget-put widget :custom-state 'themed)
  (custom-redraw-magic widget)
  (widget-setup))

(defun custom-theme-delete-face (widget)
  (setq custom-theme-faces
	(assq-delete-all (widget-value widget) custom-theme-faces))
  (widget-delete widget))

;;; Reading and writing

(defun custom-theme-visit-theme ()
  (interactive)
  (when (and (y-or-n-p "Discard current changes? ")
	     (progn (revert-buffer) t))
    (let ((theme (call-interactively 'custom-theme-merge-theme)))
      (unless (eq theme 'user)
	(widget-value-set custom-theme-name (symbol-name theme)))
      (widget-value-set custom-theme-description
			(or (get theme 'theme-documentation)
			    (format-time-string "Created %Y-%m-%d.")))
      (widget-setup))))

(defun custom-theme-merge-theme (theme)
  (interactive
   (list
    (intern (completing-read "Merge custom theme: "
			     (mapcar 'symbol-name
				     (custom-available-themes))))))
  (unless (custom-theme-name-valid-p theme)
    (error "Invalid theme name `%s'" theme))
  (load-theme theme)
  (let ((settings (get theme 'theme-settings)))
    (dolist (setting settings)
      (if (eq (car setting) 'theme-value)
	  (custom-theme-add-variable (cadr setting))
	(custom-theme-add-face (cadr setting)))))
  (disable-theme theme)
  theme)

(defun custom-theme-write (&rest ignore)
  (interactive)
  (let* ((name (widget-value custom-theme-name))
	 (doc (widget-value custom-theme-description))
	 (vars  custom-theme-variables)
	 (faces custom-theme-faces)
	 filename)
    (when (string-equal name "")
      (setq name (read-from-minibuffer "Theme name: " (user-login-name)))
      (widget-value-set custom-theme-name name))
    (unless (custom-theme-name-valid-p (intern name))
      (error "Custom themes cannot be named `%s'" name))

    (setq filename (expand-file-name (concat name "-theme.el")
				     custom-theme-directory))
    (and (file-exists-p filename)
	 (not (y-or-n-p (format "File %s exists.  Overwrite? " filename)))
	 (error "Aborted"))

    (with-temp-buffer
      (emacs-lisp-mode)
      (unless (file-exists-p custom-theme-directory)
	(make-directory (file-name-as-directory custom-theme-directory) t))
      (setq buffer-file-name filename)
      (erase-buffer)
      (insert "(deftheme " name)
      (if doc (insert "\n  \"" doc "\""))
      (insert  ")\n")
      (custom-theme-write-variables name vars)
      (custom-theme-write-faces name faces)
      (insert "\n(provide-theme '" name ")\n")
      (save-buffer))
    (dolist (var vars)
      (when (widget-get (cdr var) :children)
	(widget-put (cdr var) :custom-state 'saved)
	(custom-redraw-magic (cdr var))))
    (dolist (face custom-theme-faces)
      (when (widget-get (cdr face) :children)
	(widget-put (cdr face) :custom-state 'saved)
	(custom-redraw-magic (cdr face))))
    (message "Theme written to %s" filename)))

(defun custom-theme-write-variables (theme vars)
  "Write a `custom-theme-set-variables' command for THEME.
It includes all variables in list VARS."
  (when vars
    (let ((standard-output (current-buffer)))
      (princ "\n(custom-theme-set-variables\n")
      (princ " '")
      (princ theme)
      (princ "\n")
      (dolist (spec vars)
	(let* ((symbol (car spec))
	       (child (car-safe (widget-get (cdr spec) :children)))
	       (value (if child
			  (widget-value child)
			;; For hidden widgets, use the standard value
			(get symbol 'standard-value))))
	  (when (boundp symbol)
	    (unless (bolp)
	      (princ "\n"))
	    (princ " '(")
	    (prin1 symbol)
	    (princ " ")
	    (prin1 (custom-quote value))
	    (princ ")"))))
      (if (bolp)
	  (princ " "))
      (princ ")")
      (unless (looking-at "\n")
	(princ "\n")))))

(defun custom-theme-write-faces (theme faces)
  "Write a `custom-theme-set-faces' command for THEME.
It includes all faces in list FACES."
  (when faces
    (let ((standard-output (current-buffer)))
      (princ "\n(custom-theme-set-faces\n")
      (princ " '")
      (princ theme)
      (princ "\n")
      (dolist (spec faces)
	(let* ((symbol (car spec))
	       (widget (cdr spec))
	       (child  (car-safe (widget-get widget :children)))
	       (state  (if child
			   (widget-get widget :custom-state)
			 (custom-face-state symbol)))
	       (value
		(cond ((eq state 'standard)
		       nil) ; do nothing
		      (child
		       (custom-face-widget-to-spec widget))
		      (t
		       ;; Widget is closed (hidden), but the face has
		       ;; a non-standard value.  Try to extract that
		       ;; value and save it.
		       (custom-face-get-current-spec symbol)))))
	  (when (and (facep symbol) value)
	    (if (bolp)
		(princ " '(")
	      (princ "\n '("))
	    (prin1 symbol)
	    (princ " ")
	    (prin1 value)
	    (princ ")"))))
      (if (bolp)
	  (princ " "))
      (princ ")")
      (unless (looking-at "\n")
	(princ "\n")))))


;;; Describing Custom themes.

;;;###autoload
(defun describe-theme (theme)
  "Display a description of the Custom theme THEME (a symbol)."
  (interactive
   (list
    (intern (completing-read "Describe custom theme: "
			     (mapcar 'symbol-name
				     (custom-available-themes))))))
  (unless (custom-theme-name-valid-p theme)
    (error "Invalid theme name `%s'" theme))
  (help-setup-xref (list 'describe-theme theme)
		   (called-interactively-p 'interactive))
  (with-help-window (help-buffer)
    (with-current-buffer standard-output
      (describe-theme-1 theme))))

(defun describe-theme-1 (theme)
  (prin1 theme)
  (princ " is a custom theme")
  (let ((fn (locate-file (concat (symbol-name theme) "-theme.el")
			 (cons custom-theme-directory load-path)
			 '("" "c")))
	doc)
    (when fn
      (princ " in `")
      (help-insert-xref-button (file-name-nondirectory fn)
			       'help-theme-def fn)
      (princ "'"))
    (princ ".\n")
    (if (not (memq theme custom-known-themes))
	(progn
	  (princ "It is not loaded.")
	  ;; Attempt to grab the theme documentation
	  (when fn
	    (with-temp-buffer
	      (insert-file-contents fn)
	      (let ((sexp (let ((read-circle nil))
			    (condition-case nil
				(read (current-buffer))
			      (end-of-file nil)))))
		(and sexp (listp sexp)
		     (eq (car sexp) 'deftheme)
		     (setq doc (nth 2 sexp)))))))
      (if (custom-theme-enabled-p theme)
	  (princ "It is loaded and enabled.")
	(princ "It is loaded but disabled."))
      (setq doc (get theme 'theme-documentation)))

    (princ "\n\nDocumentation:\n")
    (princ (if (stringp doc)
	       doc
	     "No documentation available.")))
  (princ "\n\nYou can ")
  (help-insert-xref-button "customize" 'help-theme-edit theme)
  (princ " this theme."))


;;; Theme chooser

(defvar custom--listed-themes)

(defcustom custom-theme-allow-multiple-selections nil
  "Whether to allow multi-selections in the *Custom Themes* buffer."
  :type 'boolean
  :group 'custom-buffer)

(defvar custom-theme-choose-mode-map
  (let ((map (make-keymap)))
    (set-keymap-parent map widget-keymap)
    (suppress-keymap map)
    (define-key map "\C-x\C-s" 'custom-theme-save)
    (define-key map "n" 'widget-forward)
    (define-key map "p" 'widget-backward)
    (define-key map "?" 'custom-describe-theme)
    map)
  "Keymap for `custom-theme-choose-mode'.")

(define-derived-mode custom-theme-choose-mode nil "Cus-Theme"
  "Major mode for selecting Custom themes.
Do not call this mode function yourself.  It is meant for internal use."
  (use-local-map custom-theme-choose-mode-map)
  (custom--initialize-widget-variables)
  (set (make-local-variable 'revert-buffer-function)
       (lambda (ignore-auto noconfirm)
	 (when (or noconfirm (y-or-n-p "Discard current choices? "))
	   (customize-themes (current-buffer))))))
(put 'custom-theme-choose-mode 'mode-class 'special)

;;;###autoload
(defun customize-themes (&optional buffer)
  "Display a selectable list of Custom themes.
When called from Lisp, BUFFER should be the buffer to use; if
omitted, a buffer named *Custom Themes* is used."
  (interactive)
  (pop-to-buffer (get-buffer-create (or buffer "*Custom Themes*")))
  (let ((inhibit-read-only t))
    (erase-buffer))
  (custom-theme-choose-mode)
  (set (make-local-variable 'custom--listed-themes) nil)
  (make-local-variable 'custom-theme-allow-multiple-selections)
  (and (null custom-theme-allow-multiple-selections)
       (> (length custom-enabled-themes) 1)
       (setq custom-theme-allow-multiple-selections t))

  (widget-insert
   (substitute-command-keys
    "Type RET or click to enable/disable listed custom themes.
Type \\[custom-describe-theme] to describe the theme at point.
Theme files are named *-theme.el in `"))
  (when (stringp custom-theme-directory)
    (widget-create 'link :value custom-theme-directory
		   :button-face 'custom-link
		   :mouse-face 'highlight
		   :pressed-face 'highlight
		   :help-echo "Describe `custom-theme-directory'."
		   :keymap custom-mode-link-map
		   :follow-link 'mouse-face
		   :action (lambda (widget &rest ignore)
			     (describe-variable 'custom-theme-directory)))
    (widget-insert "' or `"))
  (widget-create 'link :value "load-path"
		 :button-face 'custom-link
		 :mouse-face 'highlight
		 :pressed-face 'highlight
		 :help-echo "Describe `load-path'."
		 :keymap custom-mode-link-map
		 :follow-link 'mouse-face
		 :action (lambda (widget &rest ignore)
			   (describe-variable 'load-path)))
  (widget-insert "'.\n\n")
  (widget-create 'push-button
		 :tag " Save Theme Settings "
		 :help-echo "Save the selected themes for future sessions."
		 :action 'custom-theme-save)
  (widget-insert ?\n)
  (widget-create 'checkbox
		 :value custom-theme-allow-multiple-selections
		 :action 'custom-theme-selections-toggle)
  (widget-insert (propertize " Allow more than one theme at a time"
			     'face '(variable-pitch (:height 0.9))))

  (widget-insert "\n\nAvailable Custom Themes:\n")
  (let (widget)
    (dolist (theme (custom-available-themes))
      (setq widget (widget-create 'checkbox
				  :value (custom-theme-enabled-p theme)
				  :theme-name theme
				  :action 'custom-theme-checkbox-toggle))
      (push (cons theme widget) custom--listed-themes)
      (widget-create-child-and-convert widget 'push-button
				       :button-face-get 'ignore
				       :mouse-face-get 'ignore
				       :value (format " %s" theme)
				       :action 'widget-parent-action)
      (widget-insert ?\n)))
  (goto-char (point-min))
  (widget-setup))

(defun custom-theme-checkbox-toggle (widget &optional event)
  (let ((this-theme (widget-get widget :theme-name)))
    (if (widget-value widget)
	;; Disable the theme.
	(disable-theme this-theme)
      ;; Enable the theme.
      (unless custom-theme-allow-multiple-selections
	;; If only one theme is allowed, disable all other themes and
	;; uncheck their boxes.
	(dolist (theme custom-enabled-themes)
	  (and (not (eq theme this-theme))
	       (assq theme custom--listed-themes)
	       (disable-theme theme)))
	(dolist (theme custom--listed-themes)
	  (unless (eq (car theme) this-theme)
	    (widget-value-set (cdr theme) nil)
	    (widget-apply (cdr theme) :notify (cdr theme) event))))
      (load-theme this-theme)))
  ;; Mark `custom-enabled-themes' as "set for current session".
  (put 'custom-enabled-themes 'customized-value
       (list (custom-quote custom-enabled-themes)))
  ;; Check/uncheck the widget.
  (widget-toggle-action widget event))

(defun custom-describe-theme ()
  "Describe the Custom theme on the current line."
  (interactive)
  (let ((widget (widget-at (line-beginning-position))))
    (and widget
	 (describe-theme (widget-get widget :theme-name)))))

(defun custom-theme-save (&rest ignore)
  (interactive)
  (customize-save-variable 'custom-enabled-themes custom-enabled-themes)
  (message "Custom themes saved for future sessions."))

(defun custom-theme-selections-toggle (widget &optional event)
  (when (widget-value widget)
    ;; Deactivate multiple-selections.
    (if (> (length (delq nil (mapcar (lambda (x) (widget-value (cdr x)))
				     custom--listed-themes)))
	   1)
	(error "More than one theme is currently selected")))
  (widget-toggle-action widget event)
  (setq custom-theme-allow-multiple-selections (widget-value widget)))

;; arch-tag: cd6919bc-63af-410e-bae2-b6702e762344
;;; cus-theme.el ends here