unofficial mirror of bug-gnu-emacs@gnu.org 
 help / color / mirror / code / Atom feed
blob ac85ec8d94554b604d5a9a22bfd750cb779dfc66 25181 bytes (raw)
name: lisp/term/w32-win.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
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
 
;;; w32-win.el --- parse switches controlling interface with W32 window system -*- lexical-binding: t -*-

;; Copyright (C) 1993-1994, 2001-2024 Free Software Foundation, Inc.

;; Author: Kevin Gallo
;; Keywords: terminals

;; 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:

;; w32-win.el:  this file is loaded from ../lisp/startup.el when it recognizes
;; that W32 windows are to be used.  Command line switches are parsed and those
;; pertaining to W32 are processed and removed from the command line.  The
;; W32 display is opened and hooks are set for popping up the initial window.

;; startup.el will then examine startup files, and eventually call the hooks
;; which create the first window (s).

;;; Code:
\f

;; These are the standard X switches from the Xt Initialize.c file of
;; Release 4.

;; Command line		Resource Manager string

;; +rv			*reverseVideo
;; +synchronous		*synchronous
;; -background		*background
;; -bd			*borderColor
;; -bg			*background
;; -bordercolor		*borderColor
;; -borderwidth		.borderWidth
;; -bw			.borderWidth
;; -display		.display
;; -fg			*foreground
;; -fn			*font
;; -font		*font
;; -foreground		*foreground
;; -geometry		.geometry
;; -i			.iconType
;; -itype		.iconType
;; -iconic		.iconic
;; -name		.name
;; -reverse		*reverseVideo
;; -rv			*reverseVideo
;; -selectionTimeout    .selectionTimeout
;; -synchronous		*synchronous
;; -xrm

;; An alist of X options and the function which handles them.  See
;; ../startup.el.

;; (if (not (eq window-system 'w32))
;;     (error "%s: Loading w32-win.el but not compiled for w32" invocation-name))

(eval-when-compile (require 'cl-lib))
(require 'frame)
(require 'mouse)
(require 'scroll-bar)
(require 'select)
(require 'menu-bar)
(require 'dnd)
(require 'w32-vars)

(declare-function x-select-font "w32font.c"
                  (&optional frame exclude-proportional))

(defvar w32-color-map) ;; defined in w32fns.c

(declare-function w32-send-sys-command "w32fns.c")
(declare-function set-message-beep "w32fns.c")

(declare-function cygwin-convert-file-name-from-windows "cygw32.c"
		  (path &optional absolute_p))

;; Conditional on new-fontset so bootstrapping works on non-GUI compiles
(if (fboundp 'new-fontset)
    (require 'fontset))

;; The following definition is used for debugging scroll bar events.
;(defun w32-handle-scroll-bar-event (event) (interactive "e") (princ event))

;; (defun w32-drag-n-drop-debug (event)
;;   "Print the drag-n-drop EVENT in a readable form."
;;   (interactive "e")
;;   (princ event))

(defun w32-handle-dropped-file (window file-name)
  (dnd-handle-multiple-urls
   window
   (list
    (w32-dropped-file-to-url file-name))
   'private))

(defun w32-dropped-file-to-url (file-name)
  (let ((f (if (eq system-type 'cygwin)
               (cygwin-convert-file-name-from-windows file-name t)
             (subst-char-in-string ?\\ ?/ file-name)))
        (coding (if (eq system-type 'windows-nt)
		    ;; Native w32 build pretends that its file names
		    ;; are encoded in UTF-8, and converts to the
		    ;; appropriate encoding internally.
		    'utf-8
		  (or file-name-coding-system
		      default-file-name-coding-system))))

    (setq file-name
          (mapconcat 'url-hexify-string
                     (split-string (encode-coding-string f coding)
                                   "/")
                     "/")))
  (concat
   (if (eq system-type 'cygwin)
       "file://"
     "file:")
   file-name))

(defun w32-drag-n-drop (event &optional new-frame)
  "If the drag-n-drop EVENT is for a file or files, edit those
files. Switch to a buffer editing the last file dropped.

If the EVENT is for text, insert the text at point on the buffer shown
in the target window, or add to kill ring if that buffer is read-only."
  (interactive "e")
  (save-excursion
    ;; Make sure the drop target has positive co-ords
    ;; before setting the selected frame - otherwise it
    ;; won't work.  <skx@tardis.ed.ac.uk>
    (let* ((window (posn-window (event-start event)))
	   (coords (posn-x-y (event-start event)))
           (arg (car (cdr (cdr event))))
	   (x (car coords))
	   (y (cdr coords)))
      (if (and (> x 0) (> y 0))
	  (set-frame-selected-window nil window))

      (when new-frame
        (select-frame (make-frame)))
      (raise-frame)
      (setq window (selected-window))

      (if (stringp arg)
          (dnd-insert-text window 'copy arg)
        (dnd-handle-multiple-urls
         window
         (mapcar #'w32-dropped-file-to-url arg)
         'private)))))

(defun w32-drag-n-drop-other-frame (event)
  "Edit the files listed in the drag-n-drop EVENT, in other frames.
May create new frames, or reuse existing ones.  The frame editing
the last file dropped is selected."
  (interactive "e")
  (w32-drag-n-drop event t))

;; Bind the drag-n-drop event.
(global-set-key [drag-n-drop] 'w32-drag-n-drop)
(global-set-key [C-drag-n-drop] 'w32-drag-n-drop-other-frame)

;; Keyboard layout/language change events
;; For now ignore language-change events; in the future
;; we should switch the Emacs Input Method to match the
;; new layout/language selected by the user.
(global-set-key [language-change] 'ignore)

;; Some Windows applications send the 'noname' (VK_NONAME) pseudo-key
;; to prevent Windows from sleeping.  We want to ignore these key
;; events, to avoid annoying users by ringing the bell and announcing
;; that the key is not bound.
(global-set-key [noname]   'ignore)
(global-set-key [C-noname] 'ignore)
(global-set-key [M-noname] 'ignore)


(defvar x-resource-name)

\f
;;;; Function keys

 ;;; make f10 activate the real menubar rather than the mini-buffer menu
 ;;; navigation feature.
(defun w32-menu-bar-open (&optional frame)
   "Start key navigation of the menu bar in FRAME.

This initially activates the first menu-bar item, and you can then navigate
with the arrow keys, select a menu entry with the Return key or cancel with
one or two Escape keypresses.  (Two Escape keypresses are needed when a
menu was already dropped down by pressing Return.)

If FRAME has no menu bar, this function does nothing.

If FRAME is nil or not given, use the selected frame.
If FRAME does not have the menu bar enabled, display a text menu using
`tmm-menubar'."
   (interactive "i")
   (if menu-bar-mode
       (w32-send-sys-command ?\xf100 frame)
     (with-selected-frame (or frame (selected-frame))
       (tmm-menubar))))
\f

;; W32 systems have different fonts than commonly found on X, so
;; we define our own standard fontset here.
(defvar w32-standard-fontset-spec
 "-*-Courier New-normal-r-*-*-13-*-*-*-c-*-fontset-standard"
 "String of fontset spec of the standard fontset.
This defines a fontset consisting of the Courier New variations for
European languages which are distributed with Windows as
\"Multilanguage Support\".

See the documentation of `create-fontset-from-fontset-spec' for the format.")

(defun w32-win-suspend-error ()
  "Report an error when a suspend is attempted."
  (error "Suspending an Emacs running under W32 makes no sense"))

(defvar dynamic-library-alist)
(defvar libpng-version)                 ; image.c #ifdef HAVE_NTGUI
(defvar libgif-version)
(defvar libjpeg-version)

(defvar libgnutls-version)              ; gnutls.c

;;; Set default known names for external libraries
(setq dynamic-library-alist
      (list
       '(gdiplus "gdiplus.dll")
       '(shlwapi "shlwapi.dll")
       '(xpm "libxpm.dll" "xpm4.dll" "libXpm-nox4.dll")
       ;; Versions of libpng 1.4.x and later are incompatible with
       ;; earlier versions.  Set up the list of libraries according to
       ;; the version we were compiled against.  (If we were compiled
       ;; without PNG support, libpng-version's value is -1.)
       (if (>= libpng-version 10400)
	   (let ((major (/ libpng-version 10000))
		 (minor (mod (/ libpng-version 100) 10)))
	     (list 'png
		   ;; libpngXY.dll is the default name when building
		   ;; with CMake or from a lpngXYY tarball on w32,
		   ;; libpngXY-XY.dll is the DLL name when building
		   ;; with libtool / autotools
		   (format "libpng%d%d.dll" major minor)
		   (format "libpng%d%d-%d%d.dll" major minor major minor)))
	 '(png "libpng12d.dll" "libpng12.dll" "libpng3.dll" "libpng.dll"
	       ;; these are libpng 1.2.8 from GTK+
	       "libpng13d.dll" "libpng13.dll"))
       '(tiff "libtiff-5.dll" "libtiff3.dll" "libtiff.dll")
       (if (> libjpeg-version 62)
	   ;; Versions of libjpeg after 6b are incompatible with
	   ;; earlier versions, and each of versions 7, 8, and 9 is
	   ;; also incompatible with the preceding ones (the core data
	   ;; structures used for communications with the library
	   ;; gained additional members with each new version).  So we
	   ;; must use only the version of the library which Emacs was
	   ;; compiled against.
	   (list 'jpeg (format "libjpeg-%d.dll" (/ libjpeg-version 10)))
	 '(jpeg "jpeg62.dll" "libjpeg.dll" "jpeg-62.dll" "jpeg.dll"))
       ;; Versions of giflib 5.0.0 and later changed signatures of
       ;; several functions used by Emacs, which makes those versions
       ;; incompatible with previous ones.  We select the correct
       ;; libraries according to the version of giflib we were
       ;; compiled against.  (If we were compiled without GIF support,
       ;; libgif-version's value is -1.)
       (if (>= libgif-version 50100)
	   ;; Yes, giflib 5.0 uses 6 as the major version of the API,
	   ;; and giflib 5.1 uses 7, thus "libgif-7.dll" and
	   ;; "libgif-6.dll" below (giflib 4.x used 5 as the major API
	   ;; version).  giflib5.dll is from the lua-files project,
	   ;; and gif.dll is from luapower.
	   '(gif "libgif-7.dll")
	 (if (>= libgif-version 50000)
	     '(gif "libgif-6.dll" "giflib5.dll" "gif.dll")
	 '(gif "libgif-5.dll" "giflib4.dll" "libungif4.dll" "libungif.dll")))
       '(svg "librsvg-2-2.dll")
       '(webp "libwebp-7.dll" "libwebp.dll")
       '(webpdemux "libwebpdemux-2.dll" "libwebpdemux.dll")
       '(sqlite3 "libsqlite3-0.dll")
       '(gdk-pixbuf "libgdk_pixbuf-2.0-0.dll")
       '(glib "libglib-2.0-0.dll")
       '(gio "libgio-2.0-0.dll")
       '(gobject "libgobject-2.0-0.dll")
       (if (>= libgnutls-version 30400)
	   '(gnutls "libgnutls-30.dll")
	 '(gnutls "libgnutls-28.dll" "libgnutls-26.dll"))
       '(libxml2 "libxml2-2.dll" "libxml2.dll")
       '(zlib "zlib1.dll" "libz-1.dll")
       '(lcms2 "liblcms2-2.dll")
       '(gccjit "libgccjit-0.dll")
       ;; MSYS2 distributes libtree-sitter.dll, without API version
       ;; number...
       '(tree-sitter "libtree-sitter.dll" "libtree-sitter-0.dll")))

;;; multi-tty support
(defvar w32-initialized nil
  "Non-nil if the w32 window system has been initialized.")

(declare-function x-open-connection "w32fns.c"
                  (display &optional xrm-string must-succeed))
(declare-function create-default-fontset "fontset" ())
(declare-function create-fontset-from-fontset-spec "fontset"
                  (fontset-spec &optional style-variant noerror))
(declare-function create-fontset-from-x-resource "fontset" ())
(declare-function x-get-resource "frame.c"
                  (attribute class &optional component subclass))
(declare-function x-handle-args "common-win" (args))
(declare-function x-parse-geometry "frame.c" (string))
(defvar x-command-line-resources)

(cl-defmethod window-system-initialization (&context (window-system w32)
                                            &optional _display)
  "Initialize Emacs for W32 GUI frames."
  (cl-assert (not w32-initialized))

  ;; Do the actual Windows setup here; the above code just defines
  ;; functions and variables that we use now.

  (setq command-line-args (x-handle-args command-line-args))

  ;; Make sure we have a valid resource name.
  (or (stringp x-resource-name)
      (setq x-resource-name
            ;; Change any . or * characters in x-resource-name to hyphens,
            ;; so as not to choke when we use it in X resource queries.
            (replace-regexp-in-string "[.*]" "-" invocation-name)))

  (x-open-connection "w32" x-command-line-resources
                     ;; Exit with a fatal error if this fails and we
                     ;; are the initial display
                     (eq initial-window-system 'w32))

  ;; Create the default fontset.
  (create-default-fontset)
  ;; Create the standard fontset.
  (condition-case err
      (create-fontset-from-fontset-spec w32-standard-fontset-spec t)
    (error (display-warning
	    'initialization
	    (format "Creation of the standard fontset failed: %s" err)
	    :error)))
  ;; Create fontset specified in X resources "Fontset-N" (N is 0, 1,...).
  (create-fontset-from-x-resource)

  ;; Apply a geometry resource to the initial frame.  Put it at the end
  ;; of the alist, so that anything specified on the command line takes
  ;; precedence.
  (let* ((res-geometry (x-get-resource "geometry" "Geometry"))
         parsed)
    (if res-geometry
        (progn
          (setq parsed (x-parse-geometry res-geometry))
          ;; If the resource specifies a position,
          ;; call the position and size "user-specified".
          (if (or (assq 'top parsed) (assq 'left parsed))
              (setq parsed (cons '(user-position . t)
                                 (cons '(user-size . t) parsed))))
          ;; All geometry parms apply to the initial frame.
          (setq initial-frame-alist (append initial-frame-alist parsed))
          ;; The size parms apply to all frames.
          (if (and (assq 'height parsed)
                   (not (assq 'height default-frame-alist)))
              (setq default-frame-alist
                    (cons (cons 'height (cdr (assq 'height parsed)))
                          default-frame-alist))
          (if (and (assq 'width parsed)
                   (not (assq 'width default-frame-alist)))
              (setq default-frame-alist
                    (cons (cons 'width (cdr (assq 'width parsed)))
                          default-frame-alist)))))))

  ;; Check the reverseVideo resource.
  (let ((case-fold-search t))
    (let ((rv (x-get-resource "reverseVideo" "ReverseVideo")))
      (if (and rv (string-match "^\\(true\\|yes\\|on\\)$" rv))
          (setq default-frame-alist
                (cons '(reverse . t) default-frame-alist)))))

  ;; Don't let Emacs suspend under Windows.
  (add-hook 'suspend-hook #'w32-win-suspend-error)

  ;; Turn off window-splitting optimization; w32 is usually fast enough
  ;; that this is only annoying.
  (setq split-window-keep-point t)

  ;; W32 expects the menu bar cut and paste commands to use the clipboard.
  (menu-bar-enable-clipboard)

  ;; Don't show the frame name; that's redundant.
  (setq-default mode-line-frame-identification "  ")

  ;; Set to a system sound if you want a fancy bell.
  (set-message-beep 'ok)
  (x-apply-session-resources)
  (setq w32-initialized t))

(add-to-list 'display-format-alist '("\\`w32\\'" . w32))
(cl-defmethod handle-args-function (args &context (window-system w32))
  (x-handle-args args))

(cl-defmethod frame-creation-function (params &context (window-system w32))
  (x-create-frame-with-faces params))

;;;; Selections

(declare-function w32-set-clipboard-data "w32select.c"
		  (string &optional ignored))
(declare-function w32-get-clipboard-data "w32select.c"
                  (&optional ignored))
(declare-function w32-selection-exists-p "w32select.c"
                  (&optional selection terminal))
(declare-function w32-selection-targets "w32select.c"
                  (&optional selection terminal))

;;; Fix interface to (X-specific) mouse.el
(defun w32--set-selection (type value)
  (if (eq type 'CLIPBOARD)
      (w32-set-clipboard-data (string-replace "\0" "\\0" value))
    (put 'x-selections (or type 'PRIMARY) value)))

(defun w32--get-selection  (&optional type data-type)
  (cond ((and (eq type 'CLIPBOARD)
              (eq data-type 'STRING))
         (with-demoted-errors "w32-get-clipboard-data:%S"
           (w32-get-clipboard-data)))
        ((eq data-type 'TARGETS)
         (if (eq type 'CLIPBOARD)
             (w32-selection-targets type)
           (if (get 'x-selections (or type 'PRIMARY)) '[STRING])))
        (t (get 'x-selections (or type 'PRIMARY)))))

(defun w32--selection-owner-p (selection)
  (and (memq selection '(nil PRIMARY SECONDARY))
       (get 'x-selections (or selection 'PRIMARY))))

(cl-defmethod gui-backend-set-selection (type value
                                         &context (window-system w32))
  (w32--set-selection type value))

(cl-defmethod gui-backend-get-selection (type data-type
                                         &context (window-system w32))
  (w32--get-selection type data-type))

(cl-defmethod gui-backend-selection-owner-p (selection
                                             &context (window-system w32))
  (w32--selection-owner-p selection))

(cl-defmethod gui-backend-selection-exists-p (selection
                                              &context (window-system w32))
  (w32-selection-exists-p selection))

(when (eq system-type 'windows-nt)
  ;; Make copy&pasting in w32's console interact with the system's clipboard!
  ;; We could move those cl-defmethods outside of the `when' and use
  ;; "&context (system-type (eql windows-nt))" instead!
  (cl-defmethod gui-backend-set-selection (type value
                                           &context (window-system nil))
    (w32--set-selection type value))

  (cl-defmethod gui-backend-get-selection (type data-type
                                           &context (window-system nil))
    (w32--get-selection type data-type))

  (cl-defmethod gui-backend-selection-owner-p (selection
                                               &context (window-system nil))
    (w32--selection-owner-p selection))

  (cl-defmethod gui-selection-exists-p (selection
                                        &context (window-system nil))
    (w32-selection-exists-p selection)))

;; The "Windows" keys on newer keyboards bring up the Start menu
;; whether you want it or not - make Emacs ignore these keystrokes
;; rather than beep.
(global-set-key [lwindow] 'ignore)
(global-set-key [rwindow] 'ignore)

(declare-function x-server-version "w32fns.c" (&optional terminal))

(defun w32-version ()
  "Return the MS-Windows version numbers.
The value is a list of three integers: the major and minor version
numbers, and the build number."
  (x-server-version))

(defun w32-using-nt ()
  "Return non-nil if running on a Windows NT descendant.
That includes all Windows systems except for 9X/Me."
  (getenv "SystemRoot"))

;; The value of the following variable was calculated using the table in
;; https://docs.microsoft.com/windows/desktop/Intl/unicode-subset-bitfields,
;; by looking for Unicode subranges for which no USB bits are defined.
(defconst w32-no-usb-subranges
  '((#x000800 . #x0008ff)
    (#x0018b0 . #x0018ff)
    (#x001a20 . #x001aff)
    (#x001bc0 . #x001bff)
    (#x001c80 . #x001cff)
    (#x002fe0 . #x002fef)
    (#x00a4d0 . #x00a4ff)
    (#x00a6a0 . #x00a6ff)
    (#x00a830 . #x00a83f)
    (#x00a8e0 . #x00a8ff)
    (#x00a960 . #x00a9ff)
    (#x00aa60 . #x00abff)
    (#x00d7b0 . #x00d7ff)
    (#x010200 . #x01027f)
    (#x0102e0 . #x0102ff)
    (#x010350 . #x01037f)
    (#x0103e0 . #x0103ff)
    (#x0104b0 . #x0107ff)
    (#x010840 . #x0108ff)
    (#x010940 . #x0109ff)
    (#x010a60 . #x011fff)
    (#x012480 . #x01cfff)
    (#x01d250 . #x01d2ff)
    (#x01d380 . #x01d3ff)
    (#x01d800 . #x01efff)
    (#x01f0a0 . #x01ffff)
    (#x02a6e0 . #x02f7ff)
    (#x02fa20 . #x0dffff)
    (#x0e0080 . #x0e00ff)
    (#x0e01f0 . #x0fefff))
  "List of Unicode subranges whose support cannot be announced by a font.
The FONTSIGNATURE structure reported by MS-Windows for a font
includes 123 Unicode Subset bits (USBs) to identify subranges of
the Unicode codepoint space supported by the font.  Since the
number of bits is fixed, not every Unicode block can have a
corresponding USB bit; fonts that support characters from blocks
that have no USBs cannot communicate their support to Emacs,
unless the font is opened and physically tested for glyphs for
characters from these blocks.")

(defun w32--filter-USB-scripts ()
  "Filter USB scripts out of `script-representative-chars'."
  (let (val)
    (dolist (elt script-representative-chars)
      (let ((subranges w32-no-usb-subranges)
            (chars (append (cdr elt) nil)) ; handle vectors as well
            ch found subrange)
        (while (and (consp chars) (not found))
          (setq ch (car chars)
                chars (cdr chars))
          (while (and (consp subranges) (not found))
            (setq subrange (car subranges)
                  subranges (cdr subranges))
            (when (and (>= ch (car subrange)) (<= ch (cdr subrange)))
              (setq found t)
              (push elt val))))))
    (nreverse val)))

(defvar w32-non-USB-fonts nil
  "Alist of script symbols and corresponding fonts.
Each element of the alist has the form (SCRIPT FONTS...), where
SCRIPT is a symbol of a script and FONTS are one or more fonts installed
on the system that can display SCRIPT's characters.  FONTS are
specified as symbols.
Only scripts that have no corresponding Unicode Subset Bits (USBs) can
be found in this alist.
This alist is used by w32font.c when it looks for fonts that can display
characters from scripts for which no USBs are defined.")

(declare-function x-list-fonts "xfaces.c"
                  (pattern &optional face frame maximum width))

(defun w32-find-non-USB-fonts (&optional frame size)
  "Compute the value of `w32-non-USB-fonts' for specified SIZE and FRAME.
FRAME defaults to the selected frame.
SIZE is the required font size and defaults to the nominal size of the
default font on FRAME, or its best approximation."
  (let* ((inhibit-compacting-font-caches t)
         (all-fonts
          (delete-dups
           (x-list-fonts "-*-*-medium-r-normal-*-*-*-*-*-*-iso10646-1"
                         'default frame)))
         val)
    (mapc (lambda (script-desc)
            (let* ((script (car script-desc))
                   (script-chars (vconcat (cdr script-desc)))
                   (nchars (length script-chars))
                   (fntlist all-fonts)
                   (entry (list script))
                   fspec ffont font-obj glyphs idx)
              ;; For each font in FNTLIST, determine whether it
              ;; supports the representative character(s) of any
              ;; scripts that have no USBs defined for it.
              (dolist (fnt fntlist)
                (setq fspec (ignore-errors (font-spec :name fnt)))
                (if fspec
                    (setq ffont (find-font fspec frame)))
                (when ffont
                  (setq font-obj
                        (open-font ffont size frame))
                  ;; Ignore fonts for which open-font returns nil:
                  ;; they are buggy fonts that we cannot use anyway.
                  (setq glyphs
                        (if font-obj
                            (font-get-glyphs font-obj
                                             0 nchars script-chars)
                          '[nil]))
                  ;; Does this font support ALL of the script's
                  ;; representative characters?  Note that, when the
                  ;; representative characters are specified as a
                  ;; vector, this is a more stringent test than font
                  ;; selection does, because supporting _any_
                  ;; character from the vector is enough.
                  (setq idx 0)
                  (while (and (< idx nchars) (not (null (aref glyphs idx))))
                    (setq idx (1+ idx)))
                  (if (= idx nchars)
                      ;; It does; add this font to the script's entry in alist.
                      (let ((font-family (font-get font-obj :family)))
                        ;; Unifont is an ugly font, and it is already
                        ;; present in the default fontset.
                        (unless (string= (downcase (symbol-name font-family))
                                         "unifont")
                          (push font-family entry))))))
              (if (> (length entry) 1)
                  (push (nreverse entry) val))))
          (w32--filter-USB-scripts))
    ;; We've opened a lot of fonts, so clear the font caches to free
    ;; some memory.
    (clear-font-cache)
    (and val (setq w32-non-USB-fonts val))))

(provide 'w32-win)
(provide 'term/w32-win)

;;; w32-win.el ends here

debug log:

solving ac85ec8d945 ...
found ac85ec8d945 in https://yhetil.org/emacs-bugs/8ba4e567-550e-4ac2-96f4-c6f7bacd78d0@imayhem.com/
found b57b3dd3bef in https://git.savannah.gnu.org/cgit/emacs.git
preparing index
index prepared:
100644 b57b3dd3bef3aea1d0a56b314721f1f3af734697	lisp/term/w32-win.el

applying [1/1] https://yhetil.org/emacs-bugs/8ba4e567-550e-4ac2-96f4-c6f7bacd78d0@imayhem.com/
diff --git a/lisp/term/w32-win.el b/lisp/term/w32-win.el
index b57b3dd3bef..ac85ec8d945 100644

Checking patch lisp/term/w32-win.el...
Applied patch lisp/term/w32-win.el cleanly.

index at:
100644 ac85ec8d94554b604d5a9a22bfd750cb779dfc66	lisp/term/w32-win.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).