unofficial mirror of bug-gnu-emacs@gnu.org 
 help / color / mirror / code / Atom feed
blob 4d7be7d65a8cf6188c3e721f4a9b70376f874aef 20412 bytes (raw)
name: lisp/face-remap.el 	 # note: path name is non-authoritative(*)

  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
 
;;; face-remap.el --- Functions for managing `face-remapping-alist'  -*- lexical-binding: t -*-
;;
;; Copyright (C) 2008-2020 Free Software Foundation, Inc.
;;
;; Author: Miles Bader <miles@gnu.org>
;; Keywords: faces, face remapping, display, user commands
;;
;; 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 <https://www.gnu.org/licenses/>.
;;

;;; Commentary:

;;
;; This file defines some simple operations that can be used for
;; maintaining the `face-remapping-alist' in a cooperative way.  This is
;; especially important for the `default' face.
;;
;; Each face-remapping definition in `face-remapping-alist' added by
;; this code uses the form:
;;
;;   (face RELATIVE_SPECS_1 RELATIVE_SPECS_2 ... BASE_SPECS)
;;
;; The "specs" values are a lists of face names or face attribute-value
;; pairs, and are merged together, with earlier values taking precedence.
;;
;; The RELATIVE_SPECS_* values are added by `face-remap-add-relative'
;; (and removed by `face-remap-remove-relative', and are intended for
;; face "modifications" (such as increasing the size).  Typical users of
;; relative specs would be minor modes.
;;
;; BASE_SPECS is the lowest-priority value, and by default is just the
;; face name, which causes the global definition of that face to be used.
;;
;; A non-default value of BASE_SPECS may also be set using
;; `face-remap-set-base'.  Because this _overwrites_ the default
;; value inheriting from the global face definition, it is up to the
;; caller of face-remap-set-base to add such inheritance if it is
;; desired.  A typical use of face-remap-set-base would be a major
;; mode setting face remappings, e.g., of the default face.
;;
;; All modifications cause face-remapping-alist to be made buffer-local.
;;


;;; Code:

\f
;; ----------------------------------------------------------------
;; Utility functions

;; Names of face attributes corresponding to lisp face-vector positions.
;; This variable should probably be defined in C code where the actual
;; definitions are available.
;; :vector must be always at the end as a guard
;;
(defvar internal-lisp-face-attributes
  [nil
   :family :foundry :width :height :weight :slant :underline
   :inverse-video
   :foreground :background :stipple :overline :strike-through :box
   :font :inherit :fontset :distant-foreground :extend :vector])

(defun face-attrs-more-relative-p (attrs1 attrs2)
  "Return true if ATTRS1 contains a greater number of relative
face-attributes than ATTRS2.  A face attribute is considered
relative if `face-attribute-relative-p' returns non-nil.

ATTRS1 and ATTRS2 may be any value suitable for a `face' text
property, including face names, lists of face names,
face-attribute plists, etc.

This function can be used as a predicate with `sort', to sort
face lists so that more specific faces are located near the end."
  (unless (vectorp attrs1)
    (setq attrs1 (face-attributes-as-vector attrs1)))
  (unless (vectorp attrs2)
    (setq attrs2 (face-attributes-as-vector attrs2)))
  (let ((rel1-count 0) (rel2-count 0))
    (dotimes (i (length attrs1))
      (let ((attr (aref internal-lisp-face-attributes i)))
	(when attr
	  (when (face-attribute-relative-p attr (aref attrs1 i))
	    (setq rel1-count (+ rel1-count 1)))
	  (when (face-attribute-relative-p attr (aref attrs2 i))
	    (setq rel2-count (+ rel2-count 1))))))
    (< rel1-count rel2-count)))

(defun face-remap-order (entry)
  "Order ENTRY so that more relative face specs are near the beginning.
The list structure of ENTRY may be destructively modified."
  (setq entry (nreverse entry))
  (setcdr entry (sort (cdr entry) 'face-attrs-more-relative-p))
  (nreverse entry))

;;;###autoload
(defun face-remap-add-relative (face &rest specs)
  "Add a face remapping entry of FACE to SPECS in the current buffer.
Return a cookie which can be used to delete this remapping with
`face-remap-remove-relative'.

The remaining arguments, SPECS, should form a list of faces.
Each list element should be either a face name or a property list
of face attribute/value pairs.  If more than one face is listed,
that specifies an aggregate face, in the same way as in a `face'
text property, except for possible priority changes noted below.

The face remapping specified by SPECS takes effect alongside the
remappings from other calls to `face-remap-add-relative' for the
same FACE, as well as the normal definition of FACE (at lowest
priority).  This function tries to sort multiple remappings for
the same face, so that remappings specifying relative face
attributes are applied after remappings specifying absolute face
attributes.

The base (lowest priority) remapping may be set to something
other than the normal definition of FACE via `face-remap-set-base'."
  (while (and (consp specs) (null (cdr specs)))
    (setq specs (car specs)))
  (make-local-variable 'face-remapping-alist)
  (let ((entry (assq face face-remapping-alist)))
    (when (null entry)
      (setq entry (list face face))	; explicitly merge with global def
      (push entry face-remapping-alist))
    (let ((faces (cdr entry)))
      (if (symbolp faces)
	  (setq faces (list faces)))
      (setcdr entry (face-remap-order (cons specs faces)))
      ;; Force redisplay of this buffer.
      (force-mode-line-update))
    (cons face specs)))

(defun face-remap-remove-relative (cookie)
  "Remove a face remapping previously added by `face-remap-add-relative'.
COOKIE should be the return value from that function."
  (let ((remapping (assq (car cookie) face-remapping-alist)))
    (when remapping
      (let ((updated-entries (remq (cdr cookie) (cdr remapping))))
	(unless (eq updated-entries (cdr remapping))
	  (setcdr remapping updated-entries)
	  (when (or (null updated-entries)
		    (and (eq (car-safe updated-entries) (car cookie))
			 (null (cdr updated-entries))))
	    (setq face-remapping-alist
		  (remq remapping face-remapping-alist))
	    ;; Force redisplay of this buffer.
	    (force-mode-line-update))
	  (cdr cookie))))))

;;;###autoload
(defun face-remap-reset-base (face)
  "Set the base remapping of FACE to the normal definition of FACE.
This causes the remappings specified by `face-remap-add-relative'
to apply on top of the normal definition of FACE."
  (let ((entry (assq face face-remapping-alist)))
    (when entry
      ;; If there's nothing except a base remapping, we simply remove
      ;; the entire remapping entry, as setting the base to the default
      ;; would be the same as the global definition.  Otherwise, we
      ;; modify the base remapping.
      (if (null (cddr entry))		; nothing except base remapping
	  (setq face-remapping-alist	; so remove entire entry
		(remq entry face-remapping-alist))
	(setcar (last entry) face))
      ;; Force redisplay of this buffer.
      (force-mode-line-update))))  ; otherwise, just inherit global def

;;;###autoload
(defun face-remap-set-base (face &rest specs)
  "Set the base remapping of FACE in the current buffer to SPECS.
This causes the remappings specified by `face-remap-add-relative'
to apply on top of the face specification given by SPECS.

The remaining arguments, SPECS, should form a list of faces.
Each list element should be either a face name or a property list
of face attribute/value pairs, like in a `face' text property.

If SPECS is empty, call `face-remap-reset-base' to use the normal
definition of FACE as the base remapping; note that this is
different from SPECS containing a single value nil, which means
not to inherit from the global definition of FACE at all."
  (while (and (consp specs) (not (null (car specs))) (null (cdr specs)))
    (setq specs (car specs)))
  (if (or (null specs)
	  (and (eq (car specs) face) (null (cdr specs)))) ; default
      ;; Set entry back to default
      (face-remap-reset-base face)
    ;; Set the base remapping
    (make-local-variable 'face-remapping-alist)
    (let ((entry (assq face face-remapping-alist)))
      (if entry
	  (setcar (last entry) specs)	; overwrite existing base entry
	(push (list face specs) face-remapping-alist)))
    ;; Force redisplay of this buffer.
    (force-mode-line-update)))

\f
;; ----------------------------------------------------------------
;; text-scale-mode

(defcustom text-scale-mode-step 1.2
  "Scale factor used by `text-scale-mode'.
Each positive or negative step scales the default face height by this amount."
  :group 'display
  :type 'number
  :version "23.1")

;; current remapping cookie for text-scale-mode
(defvar text-scale-mode-remapping nil)
(make-obsolete-variable 'text-scale-mode-remapping "no longer used." "28.1")

(defvar text-scale-mode--remappings nil
  "List of current remapping cookies for `text-scale-mode'.")

;; Lighter displayed for text-scale-mode in mode-line minor-mode list
(defvar text-scale-mode-lighter "+0")
(make-variable-buffer-local 'text-scale-mode-lighter)

;; Number of steps that text-scale-mode will increase/decrease text height
(defvar text-scale-mode-amount 0)
(make-variable-buffer-local 'text-scale-mode-amount)

(defvar text-scale-remap-header-line-face nil
  "If non-nil, also change font size of the `header-line' face.
This will also affect any face that inherits from
`header-line'.")
(make-variable-buffer-local 'text-scale-header-line)

(defun face-remap--clear-remappings ()
  (dolist (remapping text-scale-mode--remappings)
    (face-remap-remove-relative remapping))
  (setq text-scale-mode--remappings nil))

(defun face-remap--remap-face (sym)
  (push (face-remap-add-relative sym
                       :height
                       (expt text-scale-mode-step
                             text-scale-mode-amount))
        text-scale-mode--remappings))

(define-minor-mode text-scale-mode
  "Minor mode for displaying buffer text in a larger/smaller font.

The amount of scaling is determined by the variable
`text-scale-mode-amount': one step scales the global default
face size by the value of the variable `text-scale-mode-step'
\(a negative amount shrinks the text).

The `text-scale-increase', `text-scale-decrease', and
`text-scale-set' functions may be used to interactively modify
the variable `text-scale-mode-amount' (they also enable or
disable `text-scale-mode' as necessary).

If `text-scale-remap-header-line-face' is non-nil, also change
the font size of the `header-line' face (and any face that
inherits from it)."
  :lighter (" " text-scale-mode-lighter)
  (face-remap--clear-remappings)
  (setq text-scale-mode-lighter
	(format (if (>= text-scale-mode-amount 0) "+%d" "%d")
		text-scale-mode-amount))
  (when text-scale-mode
    (face-remap--remap-face 'default)
    (when text-scale-remap-header-line-face
      (face-remap--remap-face 'header-line)))
  (force-window-update (current-buffer)))

(defun text-scale-min-amount ()
  "Return the minimum amount of text-scaling we allow."
  ;; When the resulting pixel-height of characters will become smaller
  ;; than 1 pixel, we can expect trouble from the display engine.
  ;; E.g., it requires that the character glyph's ascent is
  ;; non-negative.
  (log (/ 1.0 (frame-char-height)) text-scale-mode-step))

(defun text-scale-max-amount ()
  "Return the maximum amount of text-scaling we allow."
  ;; The display engine uses a 16-bit short for pixel-width of
  ;; characters, thus the 0xffff limitation.  It also makes no sense
  ;; to have characters wider than the display.
  (log (/ (min (display-pixel-width) #xffff)
          (frame-char-width))
       text-scale-mode-step))

;;;###autoload
(defun text-scale-set (level)
  "Set the scale factor of the default face in the current buffer to LEVEL.
If LEVEL is non-zero, `text-scale-mode' is enabled, otherwise it is disabled.

LEVEL is a number of steps, with 0 representing the default size.
Each step scales the height of the default face by the variable
`text-scale-mode-step' (a negative number decreases the height by
the same amount)."
  (interactive "p")
  (setq text-scale-mode-amount
        (max (min level (text-scale-max-amount)) (text-scale-min-amount)))
  (text-scale-mode (if (zerop text-scale-mode-amount) -1 1)))

;;;###autoload
(defun text-scale-increase (inc)
  "Increase the height of the default face in the current buffer by INC steps.
If the new height is other than the default, `text-scale-mode' is enabled.

Each step scales the height of the default face by the variable
`text-scale-mode-step' (a negative number of steps decreases the
height by the same amount).  As a special case, an argument of 0
will remove any scaling currently active."
  (interactive "p")
  (let* ((current-value (if text-scale-mode text-scale-mode-amount 0))
         (new-value (if (= inc 0) 0 (+ current-value inc))))
    (if (or (> new-value (text-scale-max-amount))
            (< new-value (text-scale-min-amount)))
        (user-error "Cannot %s the default face height more than it already is"
                    (if (> inc 0) "increase" "decrease")))
    (setq text-scale-mode-amount new-value))
  (text-scale-mode (if (zerop text-scale-mode-amount) -1 1)))

;;;###autoload
(defun text-scale-decrease (dec)
  "Decrease the height of the default face in the current buffer by DEC steps.
See `text-scale-increase' for more details."
  (interactive "p")
  (text-scale-increase (- dec)))

;;;###autoload (define-key ctl-x-map [(control ?+)] 'text-scale-adjust)
;;;###autoload (define-key ctl-x-map [(control ?-)] 'text-scale-adjust)
;;;###autoload (define-key ctl-x-map [(control ?=)] 'text-scale-adjust)
;;;###autoload (define-key ctl-x-map [(control ?0)] 'text-scale-adjust)
;;;###autoload
(defun text-scale-adjust (inc)
  "Adjust the height of the default face by INC.

INC may be passed as a numeric prefix argument.

The actual adjustment made depends on the final component of the
key-binding used to invoke the command, with all modifiers removed:

   +, =   Increase the default face height by one step
   -      Decrease the default face height by one step
   0      Reset the default face height to the global default

After adjusting, continue to read input events and further adjust
the face height as long as the input event read
\(with all modifiers removed) is one of the above characters.

Each step scales the height of the default face by the variable
`text-scale-mode-step' (a negative number of steps decreases the
height by the same amount).  As a special case, an argument of 0
will remove any scaling currently active.

This command is a special-purpose wrapper around the
`text-scale-increase' command which makes repetition convenient
even when it is bound in a non-top-level keymap.  For binding in
a top-level keymap, `text-scale-increase' or
`text-scale-decrease' may be more appropriate."
  (interactive "p")
  (let ((ev last-command-event)
	(echo-keystrokes nil))
    (let* ((base (event-basic-type ev))
           (step
            (pcase base
              ((or ?+ ?=) inc)
              (?- (- inc))
              (?0 0)
              (_ inc))))
      (text-scale-increase step)
      ;; (unless (zerop step)
      (message "Use +,-,0 for further adjustment")
      (set-transient-map
       (let ((map (make-sparse-keymap)))
         (dolist (mods '(() (control)))
           (dolist (key '(?- ?+ ?= ?0)) ;; = is often unshifted +.
             (define-key map (vector (append mods (list key)))
               (lambda () (interactive) (text-scale-adjust (abs inc))))))
         map))))) ;; )

\f
;; ----------------------------------------------------------------
;; buffer-face-mode

(defcustom buffer-face-mode-face 'variable-pitch
  "The face specification used by `buffer-face-mode'.
It may contain any value suitable for a `face' text property,
including a face name, a list of face names, a face-attribute
plist, etc."
  :type '(choice (face)
		 (repeat :tag "List of faces" face)
		 (plist :tag "Face property list"))
  :group 'display
  :version "23.1")

;; current remapping cookie for  buffer-face-mode
(defvar buffer-face-mode-remapping nil)
(make-variable-buffer-local 'buffer-face-mode-remapping)

;;;###autoload
(define-minor-mode buffer-face-mode
  "Minor mode for a buffer-specific default face.

When enabled, the face specified by the variable
`buffer-face-mode-face' is used to display the buffer text."
  :lighter " BufFace"
  (when buffer-face-mode-remapping
    (face-remap-remove-relative buffer-face-mode-remapping))
  (setq buffer-face-mode-remapping
	(and buffer-face-mode
	     (face-remap-add-relative 'default buffer-face-mode-face)))
  (force-window-update (current-buffer)))

;;;###autoload
(defun buffer-face-set (&rest specs)
  "Enable `buffer-face-mode', using face specs SPECS.
Each argument in SPECS should be a face, i.e. either a face name
or a property list of face attributes and values.  If more than
one face is listed, that specifies an aggregate face, like in a
`face' text property.  If SPECS is nil or omitted, disable
`buffer-face-mode'.

This function makes the variable `buffer-face-mode-face' buffer
local, and sets it to FACE."
  (interactive (list (read-face-name "Set buffer face" (face-at-point t))))
  (while (and (consp specs) (null (cdr specs)))
    (setq specs (car specs)))
  (if (null specs)
      (buffer-face-mode 0)
    (set (make-local-variable 'buffer-face-mode-face) specs)
    (buffer-face-mode t)))

;;;###autoload
(defun buffer-face-toggle (&rest specs)
  "Toggle `buffer-face-mode', using face specs SPECS.
Each argument in SPECS should be a face, i.e. either a face name
or a property list of face attributes and values.  If more than
one face is listed, that specifies an aggregate face, like in a
`face' text property.

If `buffer-face-mode' is already enabled, and is currently using
the face specs SPECS, then it is disabled; if `buffer-face-mode'
is disabled, or is enabled and currently displaying some other
face, then is left enabled, but the face changed to reflect SPECS.

This function will make the variable `buffer-face-mode-face'
buffer local, and set it to SPECS."
  (interactive (list buffer-face-mode-face))
  (while (and (consp specs) (null (cdr specs)))
    (setq specs (car specs)))
  (if (or (null specs)
	  (and buffer-face-mode (equal buffer-face-mode-face specs)))
      (buffer-face-mode 0)
    (set (make-local-variable 'buffer-face-mode-face) specs)
    (buffer-face-mode t)))

(defun buffer-face-mode-invoke (specs arg &optional interactive)
  "Enable or disable `buffer-face-mode' using face specs SPECS.
ARG controls whether the mode is enabled or disabled, and is
interpreted in the usual manner for minor-mode commands.

SPECS can be any value suitable for a `face' text property,
including a face name, a plist of face attributes and values,
or a list of faces.

If INTERACTIVE is non-nil, display a message describing the
result.

This is a wrapper function which calls `buffer-face-set' or
`buffer-face-toggle' (depending on ARG), and prints a status
message in the echo area.  In many cases one of those functions
may be more appropriate."
  (let ((last-message (current-message)))
    (if (or (eq arg 'toggle) (not arg))
	(buffer-face-toggle specs)
      (buffer-face-set (and (> (prefix-numeric-value arg) 0) specs)))
    (when interactive
      (unless (and (current-message)
		   (not (equal last-message (current-message))))
	(message "Buffer-Face mode %sabled"
		 (if buffer-face-mode "en" "dis"))))))

\f
;; ----------------------------------------------------------------
;; variable-pitch-mode

;;;###autoload
(defun variable-pitch-mode (&optional arg)
  "Variable-pitch default-face mode.
An interface to `buffer-face-mode' which uses the `variable-pitch' face.
Besides the choice of face, it is the same as `buffer-face-mode'."
  (interactive (list (or current-prefix-arg 'toggle)))
  (buffer-face-mode-invoke 'variable-pitch (or arg t)
			   (called-interactively-p 'interactive)))


(provide 'face-remap)

;;; face-remap.el ends here

debug log:

solving 4d7be7d65a ...
found 4d7be7d65a in https://yhetil.org/emacs-bugs/CADwFkmmh23Wr7Lkg5kTSTVeSna1JYBngPhSknbUjCg9AXRMwNQ@mail.gmail.com/
found 028269a4b0 in https://git.savannah.gnu.org/cgit/emacs.git
preparing index
index prepared:
100644 028269a4b0c2ecc062c614ce849d55d4a2a0b195	lisp/face-remap.el

applying [1/1] https://yhetil.org/emacs-bugs/CADwFkmmh23Wr7Lkg5kTSTVeSna1JYBngPhSknbUjCg9AXRMwNQ@mail.gmail.com/
diff --git a/lisp/face-remap.el b/lisp/face-remap.el
index 028269a4b0..4d7be7d65a 100644

Checking patch lisp/face-remap.el...
Applied patch lisp/face-remap.el cleanly.

index at:
100644 4d7be7d65a8cf6188c3e721f4a9b70376f874aef	lisp/face-remap.el

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this public inbox

	https://git.savannah.gnu.org/cgit/emacs.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).