lisp/faces.el

   1 ;;; faces.el --- Lisp interface to the c "face" structure
   2
   3 ;; Copyright (C) 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
   4
   5 ;; This file is part of GNU Emacs.
   6
   7 ;; GNU Emacs is free software; you can redistribute it and/or modify
   8 ;; it under the terms of the GNU General Public License as published by
   9 ;; the Free Software Foundation; either version 2, or (at your option)
  10 ;; any later version.
  11
  12 ;; GNU Emacs is distributed in the hope that it will be useful,
  13 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 ;; GNU General Public License for more details.
  16
  17 ;; You should have received a copy of the GNU General Public License
  18 ;; along with GNU Emacs; see the file COPYING.  If not, write to
  19 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  20
  21 ;;; Commentary:
  22
  23 ;; Mostly derived from Lucid.
  24
  25 ;;; Code:
  26
  27 (eval-when-compile
  28  ;; These used to be defsubsts, now they're subrs.  Avoid losing if we're
  29  ;; being compiled with an old Emacs that still has defsubrs in it.
  30  (put 'face-name 'byte-optimizer nil)
  31  (put 'face-id 'byte-optimizer nil)
  32  (put 'face-font 'byte-optimizer nil)
  33  (put 'face-foreground 'byte-optimizer nil)
  34  (put 'face-background 'byte-optimizer nil)
  35  (put 'face-stipple 'byte-optimizer nil)
  36  (put 'face-underline-p 'byte-optimizer nil)
  37  (put 'set-face-font 'byte-optimizer nil)
  38  (put 'set-face-foreground 'byte-optimizer nil)
  39  (put 'set-face-background 'byte-optimizer nil)
  40  (put 'set-face-stipple 'byte-optimizer nil)
  41  (put 'set-face-underline-p 'byte-optimizer nil))
  42 \f
  43 ;;;; Functions for manipulating face vectors.
  44
  45 ;;; A face vector is a vector of the form:
  46 ;;;    [face NAME ID FONT FOREGROUND BACKGROUND STIPPLE UNDERLINE]
  47
  48 ;;; Type checkers.
  49 (defsubst internal-facep (x)
  50   (and (vectorp x) (= (length x) 8) (eq (aref x 0) 'face)))
  51
  52 (defun facep (x)
  53   "Return t if X is a face name or an internal face vector."
  54   (and (or (internal-facep x)
  55            (and (symbolp x) (assq x global-face-data)))
  56        t))
  57
  58 (defmacro internal-check-face (face)
  59   (` (or (internal-facep (, face))
  60          (signal 'wrong-type-argument (list 'internal-facep (, face))))))
  61
  62 ;;; Accessors.
  63 (defun face-name (face)
  64   "Return the name of face FACE."
  65   (aref (internal-get-face face) 1))
  66
  67 (defun face-id (face)
  68   "Return the internal ID number of face FACE."
  69   (aref (internal-get-face face) 2))
  70
  71 (defun face-font (face &optional frame)
  72   "Return the font name of face FACE, or nil if it is unspecified.
  73 If the optional argument FRAME is given, report on face FACE in that frame.
  74 If FRAME is t, report on the defaults for face FACE (for new frames).
  75   The font default for a face is either nil, or a list
  76   of the form (bold), (italic) or (bold italic).
  77 If FRAME is omitted or nil, use the selected frame."
  78   (aref (internal-get-face face frame) 3))
  79
  80 (defun face-foreground (face &optional frame)
  81   "Return the foreground color name of face FACE, or nil if unspecified.
  82 If the optional argument FRAME is given, report on face FACE in that frame.
  83 If FRAME is t, report on the defaults for face FACE (for new frames).
  84 If FRAME is omitted or nil, use the selected frame."
  85   (aref (internal-get-face face frame) 4))
  86
  87 (defun face-background (face &optional frame)
  88   "Return the background color name of face FACE, or nil if unspecified.
  89 If the optional argument FRAME is given, report on face FACE in that frame.
  90 If FRAME is t, report on the defaults for face FACE (for new frames).
  91 If FRAME is omitted or nil, use the selected frame."
  92   (aref (internal-get-face face frame) 5))
  93
  94 (defun face-stipple (face &optional frame)
  95  "Return the stipple pixmap name of face FACE, or nil if unspecified.
  96 If the optional argument FRAME is given, report on face FACE in that frame.
  97 If FRAME is t, report on the defaults for face FACE (for new frames).
  98 If FRAME is omitted or nil, use the selected frame."
  99  (aref (internal-get-face face frame) 6))
 100
 101 (defalias 'face-background-pixmap 'face-stipple)
 102
 103 (defun face-underline-p (face &optional frame)
 104  "Return t if face FACE is underlined.
 105 If the optional argument FRAME is given, report on face FACE in that frame.
 106 If FRAME is t, report on the defaults for face FACE (for new frames).
 107 If FRAME is omitted or nil, use the selected frame."
 108  (aref (internal-get-face face frame) 7))
 109
 110 \f
 111 ;;; Mutators.
 112
 113 (defun set-face-font (face font &optional frame)
 114   "Change the font of face FACE to FONT (a string).
 115 If the optional FRAME argument is provided, change only
 116 in that frame; otherwise change each frame."
 117   (interactive (internal-face-interactive "font"))
 118   (if (stringp font) (setq font (x-resolve-font-name font 'default frame)))
 119   (internal-set-face-1 face 'font font 3 frame))
 120
 121 (defun set-face-foreground (face color &optional frame)
 122   "Change the foreground color of face FACE to COLOR (a string).
 123 If the optional FRAME argument is provided, change only
 124 in that frame; otherwise change each frame."
 125   (interactive (internal-face-interactive "foreground"))
 126   (internal-set-face-1 face 'foreground color 4 frame))
 127
 128 (defvar face-default-stipple "gray3"
 129   "Default stipple pattern used on monochrome displays.
 130 This stipple pattern is used on monochrome displays
 131 instead of shades of gray for a face background color.
 132 See `set-face-stipple' for possible values for this variable.")
 133
 134 (defun face-color-gray-p (color &optional frame)
 135   "Return t if COLOR is a shade of gray (or white or black).
 136 FRAME specifies the frame and thus the display for interpreting COLOR."
 137   (let* ((values (x-color-values color frame))
 138          (r (nth 0 values))
 139          (g (nth 1 values))
 140          (b (nth 2 values)))
 141     (and (< (abs (- r g)) (/ (max 1 (abs r) (abs g)) 20))
 142          (< (abs (- g b)) (/ (max 1 (abs g) (abs b)) 20))
 143          (< (abs (- b r)) (/ (max 1 (abs b) (abs r)) 20)))))
 144
 145 (defun set-face-background (face color &optional frame)
 146   "Change the background color of face FACE to COLOR (a string).
 147 If the optional FRAME argument is provided, change only
 148 in that frame; otherwise change each frame."
 149   (interactive (internal-face-interactive "background"))
 150   ;; For a specific frame, use gray stipple instead of gray color
 151   ;; if the display does not support a gray color.
 152   (if (and frame (not (eq frame t))
 153            (not (face-color-supported-p frame color t)))
 154       (set-face-stipple face face-default-stipple frame)
 155     (if (null frame)
 156         (let ((frames (frame-list)))
 157           (while frames
 158             (set-face-background (face-name face) color (car frames))
 159             (setq frames (cdr frames)))
 160           (set-face-background face color t)
 161           color)
 162       (internal-set-face-1 face 'background color 5 frame))))
 163
 164 (defun set-face-stipple (face pixmap &optional frame)
 165   "Change the stipple pixmap of face FACE to PIXMAP.
 166 PIXMAP should be a string, the name of a file of pixmap data.
 167 The directories listed in the `x-bitmap-file-path' variable are searched.
 168
 169 Alternatively, PIXMAP may be a list of the form (WIDTH HEIGHT DATA)
 170 where WIDTH and HEIGHT are the size in pixels,
 171 and DATA is a string, containing the raw bits of the bitmap.
 172
 173 If the optional FRAME argument is provided, change only
 174 in that frame; otherwise change each frame."
 175   (interactive (internal-face-interactive "stipple"))
 176   (internal-set-face-1 face 'background-pixmap pixmap 6 frame))
 177
 178 (defalias 'set-face-background-pixmap 'set-face-stipple)
 179
 180 (defun set-face-underline-p (face underline-p &optional frame)
 181   "Specify whether face FACE is underlined.  (Yes if UNDERLINE-P is non-nil.)
 182 If the optional FRAME argument is provided, change only
 183 in that frame; otherwise change each frame."
 184   (interactive (internal-face-interactive "underline-p" "underlined"))
 185   (internal-set-face-1 face 'underline underline-p 7 frame))
 186 \f
 187 (defun modify-face-read-string (face default name alist)
 188   (let ((value
 189          (completing-read
 190           (if default
 191               (format "Set face %s %s (default %s): "
 192                       face name (downcase default))
 193             (format "Set face %s %s: " face name))
 194           alist)))
 195     (cond ((equal value "none")
 196            nil)
 197           ((equal value "")
 198            default)
 199           (t value))))
 200
 201 (defun modify-face (face foreground background stipple
 202                          bold-p italic-p underline-p)
 203   "Change the display attributes for face FACE.
 204 FOREGROUND and BACKGROUND should be color strings or nil.
 205 STIPPLE should be a stipple pattern name or nil.
 206 BOLD-P, ITALIC-P, and UNDERLINE-P specify whether the face should be set bold,
 207 in italic, and underlined, respectively.  (Yes if non-nil.)
 208 If called interactively, prompts for a face and face attributes."
 209   (interactive
 210    (let* ((completion-ignore-case t)
 211           (face        (symbol-name (read-face-name "Modify face: ")))
 212           (colors      (mapcar 'list x-colors))
 213           (stipples    (mapcar 'list
 214                                (apply 'nconc
 215                                       (mapcar 'directory-files
 216                                               x-bitmap-file-path))))
 217           (foreground  (modify-face-read-string
 218                         face (face-foreground (intern face))
 219                         "foreground" colors))
 220           (background  (modify-face-read-string
 221                         face (face-background (intern face))
 222                         "background" colors))
 223           (stipple     (modify-face-read-string
 224                         face (face-stipple (intern face))
 225                         "stipple" stipples))
 226           (bold-p      (y-or-n-p (concat "Set face " face " bold ")))
 227           (italic-p    (y-or-n-p (concat "Set face " face " italic ")))
 228           (underline-p (y-or-n-p (concat "Set face " face " underline "))))
 229      (message "Face %s: %s" face
 230       (mapconcat 'identity
 231        (delq nil
 232         (list (and foreground (concat (downcase foreground) " foreground"))
 233               (and background (concat (downcase background) " background"))
 234               (and stipple (concat (downcase stipple) " stipple"))
 235               (and bold-p "bold") (and italic-p "italic")
 236               (and underline-p "underline"))) ", "))
 237      (list (intern face) foreground background stipple
 238            bold-p italic-p underline-p)))
 239   (condition-case nil (set-face-foreground face foreground) (error nil))
 240   (condition-case nil (set-face-background face background) (error nil))
 241   (condition-case nil (set-face-stipple face stipple) (error nil))
 242   (funcall (if bold-p 'make-face-bold 'make-face-unbold) face nil t)
 243   (funcall (if italic-p 'make-face-italic 'make-face-unitalic) face nil t)
 244   (set-face-underline-p face underline-p)
 245   (and (interactive-p) (redraw-display)))
 246 \f
 247 ;;;; Associating face names (symbols) with their face vectors.
 248
 249 (defvar global-face-data nil
 250   "Internal data for face support functions.  Not for external use.
 251 This is an alist associating face names with the default values for
 252 their parameters.  Newly created frames get their data from here.")
 253
 254 (defun face-list ()
 255   "Returns a list of all defined face names."
 256   (mapcar 'car global-face-data))
 257
 258 (defun internal-find-face (name &optional frame)
 259   "Retrieve the face named NAME.  Return nil if there is no such face.
 260 If the optional argument FRAME is given, this gets the face NAME for
 261 that frame; otherwise, it uses the selected frame.
 262 If FRAME is the symbol t, then the global, non-frame face is returned.
 263 If NAME is already a face, it is simply returned."
 264   (if (and (eq frame t) (not (symbolp name)))
 265       (setq name (face-name name)))
 266   (if (symbolp name)
 267       (cdr (assq name
 268                  (if (eq frame t)
 269                      global-face-data
 270                    (frame-face-alist (or frame (selected-frame))))))
 271     (internal-check-face name)
 272     name))
 273
 274 (defun internal-get-face (name &optional frame)
 275   "Retrieve the face named NAME; error if there is none.
 276 If the optional argument FRAME is given, this gets the face NAME for
 277 that frame; otherwise, it uses the selected frame.
 278 If FRAME is the symbol t, then the global, non-frame face is returned.
 279 If NAME is already a face, it is simply returned."
 280   (or (internal-find-face name frame)
 281       (internal-check-face name)))
 282
 283
 284 (defun internal-set-face-1 (face name value index frame)
 285   (let ((inhibit-quit t))
 286     (if (null frame)
 287         (let ((frames (frame-list)))
 288           (while frames
 289             (internal-set-face-1 (face-name face) name value index (car frames))
 290             (setq frames (cdr frames)))
 291           (aset (internal-get-face (if (symbolp face) face (face-name face)) t)
 292                 index value)
 293           value)
 294       (or (eq frame t)
 295           (set-face-attribute-internal (face-id face) name value frame))
 296       (aset (internal-get-face face frame) index value))))
 297
 298
 299 (defun read-face-name (prompt)
 300   (let (face)
 301     (while (= (length face) 0)
 302       (setq face (completing-read prompt
 303                                   (mapcar '(lambda (x) (list (symbol-name x)))
 304                                           (face-list))
 305                                   nil t)))
 306     (intern face)))
 307
 308 (defun internal-face-interactive (what &optional bool)
 309   (let* ((fn (intern (concat "face-" what)))
 310          (prompt (concat "Set " what " of face"))
 311          (face (read-face-name (concat prompt ": ")))
 312          (default (if (fboundp fn)
 313                       (or (funcall fn face (selected-frame))
 314                           (funcall fn 'default (selected-frame)))))
 315          (value (if bool
 316                     (y-or-n-p (concat "Should face " (symbol-name face)
 317                                       " be " bool "? "))
 318                   (read-string (concat prompt " " (symbol-name face) " to: ")
 319                                default))))
 320     (list face (if (equal value "") nil value))))
 321
 322
 323
 324 (defun make-face (name)
 325   "Define a new FACE on all frames.
 326 You can modify the font, color, etc of this face with the set-face- functions.
 327 If the face already exists, it is unmodified."
 328   (interactive "SMake face: ")
 329   (or (internal-find-face name)
 330       (let ((face (make-vector 8 nil)))
 331         (aset face 0 'face)
 332         (aset face 1 name)
 333         (let* ((frames (frame-list))
 334                (inhibit-quit t)
 335                (id (internal-next-face-id)))
 336           (make-face-internal id)
 337           (aset face 2 id)
 338           (while frames
 339             (set-frame-face-alist (car frames)
 340                                   (cons (cons name (copy-sequence face))
 341                                         (frame-face-alist (car frames))))
 342             (setq frames (cdr frames)))
 343           (setq global-face-data (cons (cons name face) global-face-data)))
 344         ;; when making a face after frames already exist
 345         (if (eq window-system 'x)
 346             (make-face-x-resource-internal face))
 347         ;; add to menu
 348         (if (fboundp 'facemenu-add-new-face)
 349             (facemenu-add-new-face name))
 350         face))
 351   name)
 352
 353 ;; Fill in a face by default based on X resources, for all existing frames.
 354 ;; This has to be done when a new face is made.
 355 (defun make-face-x-resource-internal (face &optional frame set-anyway)
 356   (cond ((null frame)
 357          (let ((frames (frame-list)))
 358            (while frames
 359              (if (eq (framep (car frames)) 'x)
 360                  (make-face-x-resource-internal (face-name face)
 361                                                 (car frames) set-anyway))
 362              (setq frames (cdr frames)))))
 363         (t
 364          (setq face (internal-get-face (face-name face) frame))
 365          ;;
 366          ;; These are things like "attributeForeground" instead of simply
 367          ;; "foreground" because people tend to do things like "*foreground",
 368          ;; which would cause all faces to be fully qualified, making faces
 369          ;; inherit attributes in a non-useful way.  So we've made them slightly
 370          ;; less obvious to specify in order to make them work correctly in
 371          ;; more random environments.
 372          ;;
 373          ;; I think these should be called "face.faceForeground" instead of
 374          ;; "face.attributeForeground", but they're the way they are for
 375          ;; hysterical reasons.
 376          ;;
 377          (let* ((name (symbol-name (face-name face)))
 378                 (fn  (or (x-get-resource (concat name ".attributeFont")
 379                                          "Face.AttributeFont")
 380                          (and set-anyway (face-font face))))
 381                 (fg  (or (x-get-resource (concat name ".attributeForeground")
 382                                          "Face.AttributeForeground")
 383                          (and set-anyway (face-foreground face))))
 384                 (bg  (or (x-get-resource (concat name ".attributeBackground")
 385                                          "Face.AttributeBackground")
 386                          (and set-anyway (face-background face))))
 387                 (bgp (or (x-get-resource (concat name ".attributeStipple")
 388                                          "Face.AttributeStipple")
 389                          (x-get-resource (concat name ".attributeBackgroundPixmap")
 390                                          "Face.AttributeBackgroundPixmap")
 391                          (and set-anyway (face-stipple face))))
 392                 (ulp (let ((resource (x-get-resource
 393                                       (concat name ".attributeUnderline")
 394                                       "Face.AttributeUnderline")))
 395                        (if resource
 396                            (member (downcase resource) '("on" "true"))
 397                          (and set-anyway (face-underline-p face)))))
 398                 )
 399            (if fn
 400                (condition-case ()
 401                    (cond ((string= fn "italic")
 402                           (make-face-italic face))
 403                          ((string= fn "bold")
 404                           (make-face-bold face))
 405                          ((string= fn "bold-italic")
 406                           (make-face-bold-italic face))
 407                          (t
 408                           (set-face-font face fn frame)))
 409                  (error
 410                   (if (member fn '("italic" "bold" "bold-italic"))
 411                       (message "no %s version found for face `%s'" fn name)
 412                     (message "font `%s' not found for face `%s'" fn name)))))
 413            (if fg
 414                (condition-case ()
 415                    (set-face-foreground face fg frame)
 416                  (error (message "color `%s' not allocated for face `%s'" fg name))))
 417            (if bg
 418                (condition-case ()
 419                    (set-face-background face bg frame)
 420                  (error (message "color `%s' not allocated for face `%s'" bg name))))
 421            (if bgp
 422                (condition-case ()
 423                    (set-face-stipple face bgp frame)
 424                  (error (message "pixmap `%s' not found for face `%s'" bgp name))))
 425            (if (or ulp set-anyway)
 426                (set-face-underline-p face ulp frame))
 427            )))
 428   face)
 429
 430 (defun copy-face (old-face new-face &optional frame new-frame)
 431   "Define a face just like OLD-FACE, with name NEW-FACE.
 432 If NEW-FACE already exists as a face, it is modified to be like OLD-FACE.
 433 If it doesn't already exist, it is created.
 434
 435 If the optional argument FRAME is given as a frame,
 436 NEW-FACE is changed on FRAME only.
 437 If FRAME is t, the frame-independent default specification for OLD-FACE
 438 is copied to NEW-FACE.
 439 If FRAME is nil, copying is done for the frame-independent defaults
 440 and for each existing frame.
 441 If the optional fourth argument NEW-FRAME is given,
 442 copy the information from face OLD-FACE on frame FRAME
 443 to NEW-FACE on frame NEW-FRAME."
 444   (or new-frame (setq new-frame frame))
 445   (let ((inhibit-quit t))
 446     (if (null frame)
 447         (let ((frames (frame-list)))
 448           (while frames
 449             (copy-face old-face new-face (car frames))
 450             (setq frames (cdr frames)))
 451           (copy-face old-face new-face t))
 452       (setq old-face (internal-get-face old-face frame))
 453       (setq new-face (or (internal-find-face new-face new-frame)
 454                          (make-face new-face)))
 455       (condition-case nil
 456           ;; A face that has a global symbolic font modifier such as `bold'
 457           ;; might legitimately get an error here.
 458           ;; Use the frame's default font in that case.
 459           (set-face-font new-face (face-font old-face frame) new-frame)
 460         (error
 461          (set-face-font new-face nil new-frame)))
 462       (set-face-foreground new-face (face-foreground old-face frame) new-frame)
 463       (set-face-background new-face (face-background old-face frame) new-frame)
 464       (set-face-stipple new-face
 465                         (face-stipple old-face frame)
 466                         new-frame)
 467       (set-face-underline-p new-face (face-underline-p old-face frame)
 468                             new-frame))
 469     new-face))
 470
 471 (defun face-equal (face1 face2 &optional frame)
 472   "True if the faces FACE1 and FACE2 display in the same way."
 473   (setq face1 (internal-get-face face1 frame)
 474         face2 (internal-get-face face2 frame))
 475   (and (equal (face-foreground face1 frame) (face-foreground face2 frame))
 476        (equal (face-background face1 frame) (face-background face2 frame))
 477        (equal (face-font face1 frame) (face-font face2 frame))
 478        (eq (face-underline-p face1 frame) (face-underline-p face2 frame))
 479        (equal (face-stipple face1 frame)
 480               (face-stipple face2 frame))))
 481
 482 (defun face-differs-from-default-p (face &optional frame)
 483   "True if face FACE displays differently from the default face, on FRAME.
 484 A face is considered to be ``the same'' as the default face if it is
 485 actually specified in the same way (equivalent fonts, etc) or if it is
 486 fully unspecified, and thus inherits the attributes of any face it
 487 is displayed on top of.
 488
 489 The optional argument FRAME specifies which frame to test;
 490 if FRAME is t, test the default for new frames.
 491 If FRAME is nil or omitted, test the selected frame."
 492   (let ((default (internal-get-face 'default frame)))
 493     (setq face (internal-get-face face frame))
 494     (not (and (or (equal (face-foreground default frame)
 495                          (face-foreground face frame))
 496                   (null (face-foreground face frame)))
 497               (or (equal (face-background default frame)
 498                          (face-background face frame))
 499                   (null (face-background face frame)))
 500               (or (equal (face-font default frame) (face-font face frame))
 501                   (null (face-font face frame)))
 502               (or (equal (face-stipple default frame)
 503                          (face-stipple face frame))
 504                   (null (face-stipple face frame)))
 505               (equal (face-underline-p default frame)
 506                      (face-underline-p face frame))
 507               ))))
 508
 509 (defun face-nontrivial-p (face &optional frame)
 510   "True if face FACE has some non-nil attribute.
 511 The optional argument FRAME specifies which frame to test;
 512 if FRAME is t, test the default for new frames.
 513 If FRAME is nil or omitted, test the selected frame."
 514   (setq face (internal-get-face face frame))
 515   (or (face-foreground face frame)
 516       (face-background face frame)
 517       (face-font face frame)
 518       (face-stipple face frame)
 519       (face-underline-p face frame)))
 520
 521
 522 (defun invert-face (face &optional frame)
 523   "Swap the foreground and background colors of face FACE.
 524 If the face doesn't specify both foreground and background, then
 525 set its foreground and background to the default background and foreground."
 526   (interactive (list (read-face-name "Invert face: ")))
 527   (setq face (internal-get-face face frame))
 528   (let ((fg (face-foreground face frame))
 529         (bg (face-background face frame)))
 530     (if (or fg bg)
 531         (progn
 532           (set-face-foreground face bg frame)
 533           (set-face-background face fg frame))
 534       (set-face-foreground face (or (face-background 'default frame)
 535                                     (cdr (assq 'background-color (frame-parameters frame))))
 536                            frame)
 537       (set-face-background face (or (face-foreground 'default frame)
 538                                     (cdr (assq 'foreground-color (frame-parameters frame))))
 539                            frame)))
 540   face)
 541
 542
 543 (defun internal-try-face-font (face font &optional frame)
 544   "Like set-face-font, but returns nil on failure instead of an error."
 545   (condition-case ()
 546       (set-face-font face font frame)
 547     (error nil)))
 548 \f
 549 ;; Manipulating font names.
 550
 551 (defconst x-font-regexp nil)
 552 (defconst x-font-regexp-head nil)
 553 (defconst x-font-regexp-weight nil)
 554 (defconst x-font-regexp-slant nil)
 555
 556 (defconst x-font-regexp-weight-subnum 1)
 557 (defconst x-font-regexp-slant-subnum 2)
 558 (defconst x-font-regexp-swidth-subnum 3)
 559 (defconst x-font-regexp-adstyle-subnum 4)
 560
 561 ;;; Regexps matching font names in "Host Portable Character Representation."
 562 ;;;
 563 (let ((-                "[-?]")
 564       (foundry          "[^-]+")
 565       (family           "[^-]+")
 566       (weight           "\\(bold\\|demibold\\|medium\\)")               ; 1
 567 ;     (weight\?         "\\(\\*\\|bold\\|demibold\\|medium\\|\\)")      ; 1
 568       (weight\?         "\\([^-]*\\)")                                  ; 1
 569       (slant            "\\([ior]\\)")                                  ; 2
 570 ;     (slant\?          "\\([ior?*]?\\)")                               ; 2
 571       (slant\?          "\\([^-]?\\)")                                  ; 2
 572 ;     (swidth           "\\(\\*\\|normal\\|semicondensed\\|\\)")        ; 3
 573       (swidth           "\\([^-]*\\)")                                  ; 3
 574 ;     (adstyle          "\\(\\*\\|sans\\|\\)")                          ; 4
 575       (adstyle          "\\([^-]*\\)")                                  ; 4
 576       (pixelsize        "[0-9]+")
 577       (pointsize        "[0-9][0-9]+")
 578       (resx             "[0-9][0-9]+")
 579       (resy             "[0-9][0-9]+")
 580       (spacing          "[cmp?*]")
 581       (avgwidth         "[0-9]+")
 582       (registry         "[^-]+")
 583       (encoding         "[^-]+")
 584       )
 585   (setq x-font-regexp
 586         (concat "\\`\\*?[-?*]"
 587                 foundry - family - weight\? - slant\? - swidth - adstyle -
 588                 pixelsize - pointsize - resx - resy - spacing - avgwidth -
 589                 registry - encoding "\\*?\\'"
 590                 ))
 591   (setq x-font-regexp-head
 592         (concat "\\`[-?*]" foundry - family - weight\? - slant\?
 593                 "\\([-*?]\\|\\'\\)"))
 594   (setq x-font-regexp-slant (concat - slant -))
 595   (setq x-font-regexp-weight (concat - weight -))
 596   nil)
 597
 598 (defun x-resolve-font-name (pattern &optional face frame)
 599   "Return a font name matching PATTERN.
 600 All wildcards in PATTERN become substantiated.
 601 If PATTERN is nil, return the name of the frame's base font, which never
 602 contains wildcards.
 603 Given optional arguments FACE and FRAME, return a font which is
 604 also the same size as FACE on FRAME, or fail."
 605   (or (symbolp face)
 606       (setq face (face-name face)))
 607   (and (eq frame t)
 608        (setq frame nil))
 609   (if pattern
 610       ;; Note that x-list-fonts has code to handle a face with nil as its font.
 611       (let ((fonts (x-list-fonts pattern face frame)))
 612         (or fonts
 613             (if face
 614                 (if (string-match "\\*" pattern)
 615                     (if (null (face-font face))
 616                         (error "No matching fonts are the same height as the frame default font")
 617                       (error "No matching fonts are the same height as face `%s'" face))
 618                   (if (null (face-font face))
 619                       (error "Height of font `%s' doesn't match the frame default font"
 620                              pattern)
 621                     (error "Height of font `%s' doesn't match face `%s'"
 622                            pattern face)))
 623               (error "No fonts match `%s'" pattern)))
 624         (car fonts))
 625     (cdr (assq 'font (frame-parameters (selected-frame))))))
 626
 627 (defun x-frob-font-weight (font which)
 628   (cond ((string-match x-font-regexp font)
 629          (concat (substring font 0 (match-beginning x-font-regexp-weight-subnum))
 630                  which
 631                  (substring font (match-end x-font-regexp-weight-subnum)
 632                             (match-beginning x-font-regexp-adstyle-subnum))
 633                  ;; Replace the ADD_STYLE_NAME field with *
 634                  ;; because the info in it may not be the same
 635                  ;; for related fonts.
 636                  "*"
 637                  (substring font (match-end x-font-regexp-adstyle-subnum))))
 638         ((or (string-match x-font-regexp-head font)
 639              (string-match x-font-regexp-weight font))
 640          (concat (substring font 0 (match-beginning 1)) which
 641                  (substring font (match-end 1))))))
 642
 643 (defun x-frob-font-slant (font which)
 644   (cond ((string-match x-font-regexp font)
 645          (concat (substring font 0 (match-beginning x-font-regexp-slant-subnum))
 646                  which
 647                  (substring font (match-end x-font-regexp-slant-subnum)
 648                             (match-beginning x-font-regexp-adstyle-subnum))
 649                  ;; Replace the ADD_STYLE_NAME field with *
 650                  ;; because the info in it may not be the same
 651                  ;; for related fonts.
 652                  "*"
 653                  (substring font (match-end x-font-regexp-adstyle-subnum))))
 654         ((or (string-match x-font-regexp-head font)
 655              (string-match x-font-regexp-slant font))
 656          (concat (substring font 0 (match-beginning 1)) which
 657                  (substring font (match-end 1))))))
 658
 659 (defun x-make-font-bold (font)
 660   "Given an X font specification, make a bold version of it.
 661 If that can't be done, return nil."
 662   (x-frob-font-weight font "bold"))
 663
 664 (defun x-make-font-demibold (font)
 665   "Given an X font specification, make a demibold version of it.
 666 If that can't be done, return nil."
 667   (x-frob-font-weight font "demibold"))
 668
 669 (defun x-make-font-unbold (font)
 670   "Given an X font specification, make a non-bold version of it.
 671 If that can't be done, return nil."
 672   (x-frob-font-weight font "medium"))
 673
 674 (defun x-make-font-italic (font)
 675   "Given an X font specification, make an italic version of it.
 676 If that can't be done, return nil."
 677   (x-frob-font-slant font "i"))
 678
 679 (defun x-make-font-oblique (font) ; you say tomayto...
 680   "Given an X font specification, make an oblique version of it.
 681 If that can't be done, return nil."
 682   (x-frob-font-slant font "o"))
 683
 684 (defun x-make-font-unitalic (font)
 685   "Given an X font specification, make a non-italic version of it.
 686 If that can't be done, return nil."
 687   (x-frob-font-slant font "r"))
 688 \f
 689 ;;; non-X-specific interface
 690
 691 (defun make-face-bold (face &optional frame noerror)
 692   "Make the font of the given face be bold, if possible.
 693 If NOERROR is non-nil, return nil on failure."
 694   (interactive (list (read-face-name "Make which face bold: ")))
 695   (if (and (eq frame t) (listp (face-font face t)))
 696       (set-face-font face (if (memq 'italic (face-font face t))
 697                               '(bold italic) '(bold))
 698                      t)
 699     (let (font)
 700       (if (null frame)
 701           (let ((frames (frame-list)))
 702             ;; Make this face bold in global-face-data.
 703             (make-face-bold face t noerror)
 704             ;; Make this face bold in each frame.
 705             (while frames
 706               (make-face-bold face (car frames) noerror)
 707               (setq frames (cdr frames))))
 708         (setq face (internal-get-face face frame))
 709         (setq font (or (face-font face frame)
 710                        (face-font face t)))
 711         (if (listp font)
 712             (setq font nil))
 713         (setq font (or font
 714                        (face-font 'default frame)
 715                        (cdr (assq 'font (frame-parameters frame)))))
 716         (or (and font (make-face-bold-internal face frame font))
 717             ;; We failed to find a bold version of the font.
 718             noerror
 719             (error "No bold version of %S" font))))))
 720
 721 (defun make-face-bold-internal (face frame font)
 722   (let (f2)
 723     (or (and (setq f2 (x-make-font-bold font))
 724              (internal-try-face-font face f2 frame))
 725         (and (setq f2 (x-make-font-demibold font))
 726              (internal-try-face-font face f2 frame)))))
 727
 728 (defun make-face-italic (face &optional frame noerror)
 729   "Make the font of the given face be italic, if possible.
 730 If NOERROR is non-nil, return nil on failure."
 731   (interactive (list (read-face-name "Make which face italic: ")))
 732   (if (and (eq frame t) (listp (face-font face t)))
 733       (set-face-font face (if (memq 'bold (face-font face t))
 734                               '(bold italic) '(italic))
 735                      t)
 736     (let (font)
 737       (if (null frame)
 738           (let ((frames (frame-list)))
 739             ;; Make this face italic in global-face-data.
 740             (make-face-italic face t noerror)
 741             ;; Make this face italic in each frame.
 742             (while frames
 743               (make-face-italic face (car frames) noerror)
 744               (setq frames (cdr frames))))
 745         (setq face (internal-get-face face frame))
 746         (setq font (or (face-font face frame)
 747                        (face-font face t)))
 748         (if (listp font)
 749             (setq font nil))
 750         (setq font (or font
 751                        (face-font 'default frame)
 752                        (cdr (assq 'font (frame-parameters frame)))))
 753         (or (and font (make-face-italic-internal face frame font))
 754             ;; We failed to find an italic version of the font.
 755             noerror
 756             (error "No italic version of %S" font))))))
 757
 758 (defun make-face-italic-internal (face frame font)
 759   (let (f2)
 760     (or (and (setq f2 (x-make-font-italic font))
 761              (internal-try-face-font face f2 frame))
 762         (and (setq f2 (x-make-font-oblique font))
 763              (internal-try-face-font face f2 frame)))))
 764
 765 (defun make-face-bold-italic (face &optional frame noerror)
 766   "Make the font of the given face be bold and italic, if possible.
 767 If NOERROR is non-nil, return nil on failure."
 768   (interactive (list (read-face-name "Make which face bold-italic: ")))
 769   (if (and (eq frame t) (listp (face-font face t)))
 770       (set-face-font face '(bold italic) t)
 771     (let (font)
 772       (if (null frame)
 773           (let ((frames (frame-list)))
 774             ;; Make this face bold-italic in global-face-data.
 775             (make-face-bold-italic face t noerror)
 776             ;; Make this face bold in each frame.
 777             (while frames
 778               (make-face-bold-italic face (car frames) noerror)
 779               (setq frames (cdr frames))))
 780         (setq face (internal-get-face face frame))
 781         (setq font (or (face-font face frame)
 782                        (face-font face t)))
 783         (if (listp font)
 784             (setq font nil))
 785         (setq font (or font
 786                        (face-font 'default frame)
 787                        (cdr (assq 'font (frame-parameters frame)))))
 788         (or (and font (make-face-bold-italic-internal face frame font))
 789             ;; We failed to find a bold italic version.
 790             noerror
 791             (error "No bold italic version of %S" font))))))
 792
 793 (defun make-face-bold-italic-internal (face frame font)
 794   (let (f2 f3)
 795     (or (and (setq f2 (x-make-font-italic font))
 796              (not (equal font f2))
 797              (setq f3 (x-make-font-bold f2))
 798              (not (equal f2 f3))
 799              (internal-try-face-font face f3 frame))
 800         (and (setq f2 (x-make-font-oblique font))
 801              (not (equal font f2))
 802              (setq f3 (x-make-font-bold f2))
 803              (not (equal f2 f3))
 804              (internal-try-face-font face f3 frame))
 805         (and (setq f2 (x-make-font-italic font))
 806              (not (equal font f2))
 807              (setq f3 (x-make-font-demibold f2))
 808              (not (equal f2 f3))
 809              (internal-try-face-font face f3 frame))
 810         (and (setq f2 (x-make-font-oblique font))
 811              (not (equal font f2))
 812              (setq f3 (x-make-font-demibold f2))
 813              (not (equal f2 f3))
 814              (internal-try-face-font face f3 frame)))))
 815
 816 (defun make-face-unbold (face &optional frame noerror)
 817   "Make the font of the given face be non-bold, if possible.
 818 If NOERROR is non-nil, return nil on failure."
 819   (interactive (list (read-face-name "Make which face non-bold: ")))
 820   (if (and (eq frame t) (listp (face-font face t)))
 821       (set-face-font face (if (memq 'italic (face-font face t))
 822                               '(italic) nil)
 823                      t)
 824     (let (font font1)
 825       (if (null frame)
 826           (let ((frames (frame-list)))
 827             ;; Make this face unbold in global-face-data.
 828             (make-face-unbold face t noerror)
 829             ;; Make this face unbold in each frame.
 830             (while frames
 831               (make-face-unbold face (car frames) noerror)
 832               (setq frames (cdr frames))))
 833         (setq face (internal-get-face face frame))
 834         (setq font1 (or (face-font face frame)
 835                         (face-font face t)))
 836         (if (listp font1)
 837             (setq font1 nil))
 838         (setq font1 (or font1
 839                         (face-font 'default frame)
 840                         (cdr (assq 'font (frame-parameters frame)))))
 841         (setq font (and font1 (x-make-font-unbold font1)))
 842         (or (if font (internal-try-face-font face font frame))
 843             noerror
 844             (error "No unbold version of %S" font1))))))
 845
 846 (defun make-face-unitalic (face &optional frame noerror)
 847   "Make the font of the given face be non-italic, if possible.
 848 If NOERROR is non-nil, return nil on failure."
 849   (interactive (list (read-face-name "Make which face non-italic: ")))
 850   (if (and (eq frame t) (listp (face-font face t)))
 851       (set-face-font face (if (memq 'bold (face-font face t))
 852                               '(bold) nil)
 853                      t)
 854     (let (font font1)
 855       (if (null frame)
 856           (let ((frames (frame-list)))
 857             ;; Make this face unitalic in global-face-data.
 858             (make-face-unitalic face t noerror)
 859             ;; Make this face unitalic in each frame.
 860             (while frames
 861               (make-face-unitalic face (car frames) noerror)
 862               (setq frames (cdr frames))))
 863         (setq face (internal-get-face face frame))
 864         (setq font1 (or (face-font face frame)
 865                         (face-font face t)))
 866         (if (listp font1)
 867             (setq font1 nil))
 868         (setq font1 (or font1
 869                         (face-font 'default frame)
 870                         (cdr (assq 'font (frame-parameters frame)))))
 871         (setq font (and font1 (x-make-font-unitalic font1)))
 872         (or (if font (internal-try-face-font face font frame))
 873             noerror
 874             (error "No unitalic version of %S" font1))))))
 875 \f
 876 (defvar list-faces-sample-text
 877   "abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 878   "*Text string to display as the sample text for `list-faces-display'.")
 879
 880 ;; The name list-faces would be more consistent, but let's avoid a conflict
 881 ;; with Lucid, which uses that name differently.
 882 (defun list-faces-display ()
 883   "List all faces, using the same sample text in each.
 884 The sample text is a string that comes from the variable
 885 `list-faces-sample-text'.
 886
 887 It is possible to give a particular face name different appearances in
 888 different frames.  This command shows the appearance in the
 889 selected frame."
 890   (interactive)
 891   (let ((faces (sort (face-list) (function string-lessp)))
 892         (face nil)
 893         (frame (selected-frame))
 894         disp-frame window)
 895     (with-output-to-temp-buffer "*Faces*"
 896       (save-excursion
 897         (set-buffer standard-output)
 898         (setq truncate-lines t)
 899         (while faces
 900           (setq face (car faces))
 901           (setq faces (cdr faces))
 902           (insert (format "%25s " (symbol-name face)))
 903           (let ((beg (point)))
 904             (insert list-faces-sample-text)
 905             (insert "\n")
 906             (put-text-property beg (1- (point)) 'face face)
 907             ;; If the sample text has multiple lines, line up all of them.
 908             (goto-char beg)
 909             (forward-line 1)
 910             (while (not (eobp))
 911               (insert "                          ")
 912               (forward-line 1))))
 913         (goto-char (point-min))))
 914     ;; If the *Faces* buffer appears in a different frame,
 915     ;; copy all the face definitions from FRAME,
 916     ;; so that the display will reflect the frame that was selected.
 917     (setq window (get-buffer-window (get-buffer "*Faces*") t))
 918     (setq disp-frame (if window (window-frame window)
 919                        (car (frame-list))))
 920     (or (eq frame disp-frame)
 921         (let ((faces (face-list)))
 922           (while faces
 923             (copy-face (car faces) (car faces) frame disp-frame)
 924             (setq faces (cdr faces)))))))
 925
 926 (defun describe-face (face)
 927   "Display the properties of face FACE."
 928   (interactive (list (read-face-name "Describe face: ")))
 929   (with-output-to-temp-buffer "*Help*"
 930     (princ "Properties of face `")
 931     (princ (face-name face))
 932     (princ "':") (terpri)
 933     (princ "Foreground: ") (princ (face-foreground face)) (terpri)
 934     (princ "Background: ") (princ (face-background face)) (terpri)
 935     (princ "      Font: ") (princ (face-font face)) (terpri)
 936     (princ "Underlined: ") (princ (if (face-underline-p face) "yes" "no")) (terpri)
 937     (princ "   Stipple: ") (princ (or (face-stipple face) "none"))))
 938 \f
 939 ;;; Make the standard faces.
 940 ;;; The C code knows the default and modeline faces as faces 0 and 1,
 941 ;;; so they must be the first two faces made.
 942 (defun face-initialize ()
 943   (make-face 'default)
 944   (make-face 'modeline)
 945   (make-face 'highlight)
 946
 947   ;; These aren't really special in any way, but they're nice to have around.
 948
 949   (make-face 'bold)
 950   (make-face 'italic)
 951   (make-face 'bold-italic)
 952   (make-face 'region)
 953   (make-face 'secondary-selection)
 954   (make-face 'underline)
 955
 956   (setq region-face (face-id 'region))
 957
 958   ;; Specify the global properties of these faces
 959   ;; so they will come out right on new frames.
 960
 961   (make-face-bold 'bold t)
 962   (make-face-italic 'italic t)
 963   (make-face-bold-italic 'bold-italic t)
 964
 965   (set-face-background 'highlight '("darkseagreen2" "green" t) t)
 966   (set-face-background 'region '("gray" underline) t)
 967   (set-face-background 'secondary-selection '("paleturquoise" "green" t) t)
 968   (set-face-background 'modeline '(t) t)
 969   (set-face-underline-p 'underline t t)
 970
 971   ;; Set up the faces of all existing X Window frames
 972   ;; from those global properties, unless already set in a given frame.
 973
 974   (let ((frames (frame-list)))
 975     (while frames
 976       (if (not (memq (framep (car frames)) '(t nil)))
 977           (let ((frame (car frames))
 978                 (rest global-face-data))
 979             (while rest
 980               (let ((face (car (car rest))))
 981                 (or (face-differs-from-default-p face)
 982                     (face-fill-in face (cdr (car rest)) frame)))
 983               (setq rest (cdr rest)))))
 984       (setq frames (cdr frames)))))
 985
 986 \f
 987 ;; Like x-create-frame but also set up the faces.
 988
 989 (defun x-create-frame-with-faces (&optional parameters)
 990   ;; Read this frame's geometry resource, if it has an explicit name,
 991   ;; and put the specs into PARAMETERS.
 992   (let* ((name (or (cdr (assq 'name parameters))
 993                    (cdr (assq 'name default-frame-alist))))
 994          (x-resource-name name)
 995          (res-geometry (if name (x-get-resource "geometry" "Geometry")))
 996          parsed)
 997     (if res-geometry
 998         (progn
 999           (setq parsed (x-parse-geometry res-geometry))
1000           ;; If the resource specifies a position,
1001           ;; call the position and size "user-specified".
1002           (if (or (assq 'top parsed) (assq 'left parsed))
1003               (setq parsed (cons '(user-position . t)
1004                                  (cons '(user-size . t) parsed))))
1005           ;; Put the geometry parameters at the end.
1006           ;; Copy default-frame-alist so that they go after it.
1007           (setq parameters (append parameters
1008                                    default-frame-alist
1009                                    parsed)))))
1010   (let (frame)
1011     (if (null global-face-data)
1012         (setq frame (x-create-frame parameters))
1013       (let* ((visibility-spec (assq 'visibility parameters))
1014              (faces (copy-alist global-face-data))
1015              success
1016              (rest faces))
1017         (setq frame (x-create-frame (cons '(visibility . nil) parameters)))
1018         (unwind-protect
1019             (progn
1020               (set-frame-face-alist frame faces)
1021
1022               (if (cdr (or (assq 'reverse parameters)
1023                            (assq 'reverse default-frame-alist)
1024                            (let ((resource (x-get-resource "reverseVideo"
1025                                                            "ReverseVideo")))
1026                              (if resource
1027                                  (cons nil (member (downcase resource)
1028                                                    '("on" "true")))))))
1029                   (let* ((params (frame-parameters frame))
1030                          (bg (cdr (assq 'foreground-color params)))
1031                          (fg (cdr (assq 'background-color params))))
1032                     (modify-frame-parameters frame
1033                                              (list (cons 'foreground-color fg)
1034                                                    (cons 'background-color bg)))
1035                     (if (equal bg (cdr (assq 'border-color params)))
1036                         (modify-frame-parameters frame
1037                                                  (list (cons 'border-color fg))))
1038                     (if (equal bg (cdr (assq 'mouse-color params)))
1039                         (modify-frame-parameters frame
1040                                                  (list (cons 'mouse-color fg))))
1041                     (if (equal bg (cdr (assq 'cursor-color params)))
1042                         (modify-frame-parameters frame
1043                                                  (list (cons 'cursor-color fg))))))
1044               ;; Copy the vectors that represent the faces.
1045               ;; Also fill them in from X resources.
1046               (while rest
1047                 (let ((global (cdr (car rest))))
1048                   (setcdr (car rest) (vector 'face
1049                                              (face-name (cdr (car rest)))
1050                                              (face-id (cdr (car rest)))
1051                                              nil nil nil nil nil))
1052                   (face-fill-in (car (car rest)) global frame))
1053                 (make-face-x-resource-internal (cdr (car rest)) frame t)
1054                 (setq rest (cdr rest)))
1055               (if (null visibility-spec)
1056                   (make-frame-visible frame)
1057                 (modify-frame-parameters frame (list visibility-spec)))
1058               (setq success t))
1059           (or success
1060               (delete-frame frame)))))
1061     ;; Set up the background-mode frame parameter
1062     ;; so that programs can decide good ways of highlighting
1063     ;; on this frame.
1064     (let ((bg-resource (x-get-resource ".backgroundMode"
1065                                        "BackgroundMode"))
1066           (params (frame-parameters frame))
1067           (bg-mode))
1068       (setq bg-mode
1069             (cond (bg-resource (intern (downcase bg-resource)))
1070                   ((< (apply '+ (x-color-values
1071                                  (cdr (assq 'background-color params))
1072                                  frame))
1073                       (/ (apply '+ (x-color-values "white" frame)) 3))
1074                    'dark)
1075                   (t 'light)))
1076       (modify-frame-parameters frame
1077                                (list (cons 'background-mode bg-mode)
1078                                      (cons 'display-type
1079                                            (cond ((x-display-color-p frame)
1080                                                   'color)
1081                                                  ((x-display-grayscale-p frame)
1082                                                   'grayscale)
1083                                                  (t 'mono))))))
1084     frame))
1085
1086 ;; Update a frame's faces when we change its default font.
1087 (defun frame-update-faces (frame)
1088   (let* ((faces global-face-data)
1089          (rest faces))
1090     (while rest
1091       (let* ((face (car (car rest)))
1092              (font (face-font face t)))
1093         (if (listp font)
1094             (let ((bold (memq 'bold font))
1095                   (italic (memq 'italic font)))
1096               ;; Ignore any previous (string-valued) font, it might not even
1097               ;; be the right size anymore.
1098               (set-face-font face nil frame)
1099               (cond ((and bold italic)
1100                      (make-face-bold-italic face frame t))
1101                     (bold
1102                      (make-face-bold face frame t))
1103                     (italic
1104                      (make-face-italic face frame t)))))
1105       (setq rest (cdr rest)))
1106     frame)))
1107
1108 ;; Update the colors of FACE, after FRAME's own colors have been changed.
1109 ;; This applies only to faces with global color specifications
1110 ;; that are not simple constants.
1111 (defun frame-update-face-colors (frame)
1112   (let ((faces global-face-data))
1113     (while faces
1114       (condition-case nil
1115           (let* ((data (cdr (car faces)))
1116                  (face (car (car faces)))
1117                  (foreground (face-foreground data))
1118                  (background (face-background data)))
1119             ;; If the global spec is a specific color,
1120             ;; which doesn't depend on the frame's attributes,
1121             ;; we don't need to recalculate it now.
1122             (or (listp foreground)
1123                 (setq foreground nil))
1124             (or (listp background)
1125                 (setq background nil))
1126             ;; If we are going to frob this face at all,
1127             ;; reinitialize it first.
1128             (if (or foreground background)
1129                 (progn (set-face-foreground face nil frame)
1130                        (set-face-background face nil frame)))
1131             (if foreground
1132                 (face-try-color-list 'set-face-foreground
1133                                      face foreground frame))
1134             (if background
1135                 (face-try-color-list 'set-face-background
1136                                      face background frame)))
1137         (error nil))
1138       (setq faces (cdr faces)))))
1139
1140 ;; Fill in the face FACE from frame-independent face data DATA.
1141 ;; DATA should be the non-frame-specific ("global") face vector
1142 ;; for the face.  FACE should be a face name or face object.
1143 ;; FRAME is the frame to act on; it must be an actual frame, not nil or t.
1144 (defun face-fill-in (face data frame)
1145   (condition-case nil
1146       (let ((foreground (face-foreground data))
1147             (background (face-background data))
1148             (font (face-font data))
1149             (stipple (face-stipple data)))
1150         (set-face-underline-p face (face-underline-p data) frame)
1151         (if foreground
1152             (face-try-color-list 'set-face-foreground
1153                                  face foreground frame))
1154         (if background
1155             (face-try-color-list 'set-face-background
1156                                  face background frame))
1157         (if (listp font)
1158             (let ((bold (memq 'bold font))
1159                   (italic (memq 'italic font)))
1160               (cond ((and bold italic)
1161                      (make-face-bold-italic face frame))
1162                     (bold
1163                      (make-face-bold face frame))
1164                     (italic
1165                      (make-face-italic face frame))))
1166           (if font
1167               (set-face-font face font frame)))
1168         (if stipple
1169             (set-face-stipple face stipple frame)))
1170     (error nil)))
1171
1172 ;; Assuming COLOR is a valid color name,
1173 ;; return t if it can be displayed on FRAME.
1174 (defun face-color-supported-p (frame color background-p)
1175   (or (x-display-color-p frame)
1176       ;; A black-and-white display can implement these.
1177       (member color '("black" "white"))
1178       ;; A black-and-white display can fake gray for background.
1179       (and background-p
1180            (face-color-gray-p color frame))
1181       ;; A grayscale display can implement colors that are gray (more or less).
1182       (and (x-display-grayscale-p frame)
1183            (face-color-gray-p color frame))))
1184
1185 ;; Use FUNCTION to store a color in FACE on FRAME.
1186 ;; COLORS is either a single color or a list of colors.
1187 ;; If it is a list, try the colors one by one until one of them
1188 ;; succeeds.  We signal an error only if all the colors failed.
1189 ;; t as COLORS or as an element of COLORS means to invert the face.
1190 ;; That can't fail, so any subsequent elements after the t are ignored.
1191 (defun face-try-color-list (function face colors frame)
1192   (if (stringp colors)
1193       (if (face-color-supported-p frame colors
1194                                   (eq function 'set-face-background))
1195           (funcall function face colors frame))
1196     (if (eq colors t)
1197         (invert-face face frame)
1198       (let (done)
1199         (while (and colors (not done))
1200           (if (or (memq (car colors) '(t underline))
1201                   (face-color-supported-p frame (car colors)
1202                                           (eq function 'set-face-background)))
1203               (if (cdr colors)
1204                   ;; If there are more colors to try, catch errors
1205                   ;; and set `done' if we succeed.
1206                   (condition-case nil
1207                       (progn
1208                         (cond ((eq (car colors) t)
1209                                (invert-face face frame))
1210                               ((eq (car colors) 'underline)
1211                                (set-face-underline-p face t frame))
1212                               (t
1213                                (funcall function face (car colors) frame)))
1214                         (setq done t))
1215                     (error nil))
1216                 ;; If this is the last color, let the error get out if it fails.
1217                 ;; If it succeeds, we will exit anyway after this iteration.
1218                 (cond ((eq (car colors) t)
1219                        (invert-face face frame))
1220                       ((eq (car colors) 'underline)
1221                        (set-face-underline-p face t frame))
1222                       (t
1223                        (funcall function face (car colors) frame)))))
1224           (setq colors (cdr colors)))))))
1225
1226 ;; If we are already using x-window frames, initialize faces for them.
1227 (if (eq (framep (selected-frame)) 'x)
1228     (face-initialize))
1229
1230 (provide 'faces)
1231
1232 ;;; faces.el ends here