lisp/facemenu.el

   1 ;;; facemenu.el --- create a face menu for interactively adding fonts to text
   2 ;; Copyright (c) 1994, 1995 Free Software Foundation, Inc.
   3
   4 ;; Author: Boris Goldowsky <boris@gnu.ai.mit.edu>
   5 ;; Keywords: faces
   6
   7 ;; This file is part of GNU Emacs.
   8
   9 ;; GNU Emacs is free software; you can redistribute it and/or modify
  10 ;; it under the terms of the GNU General Public License as published by
  11 ;; the Free Software Foundation; either version 2, or (at your option)
  12 ;; any later version.
  13
  14 ;; GNU Emacs is distributed in the hope that it will be useful,
  15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 ;; GNU General Public License for more details.
  18
  19 ;; You should have received a copy of the GNU General Public License
  20 ;; along with GNU Emacs; see the file COPYING.  If not, write to
  21 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  22
  23 ;;; Commentary:
  24 ;; This file defines a menu of faces (bold, italic, etc) which allows you to
  25 ;; set the face used for a region of the buffer.  Some faces also have
  26 ;; keybindings, which are shown in the menu.  Faces with names beginning with
  27 ;; "fg:" or "bg:", as in "fg:red", are treated specially.
  28 ;; Such faces are assumed to consist only of a foreground (if "fg:") or
  29 ;; background (if "bg:") color.  They are thus put into the color submenus
  30 ;; rather than the general Face submenu.  These faces can also be
  31 ;; automatically created by selecting the "Other..." menu items in the
  32 ;; "Foreground" and "Background" submenus.
  33 ;;
  34 ;; The menu also contains submenus for indentation and justification-changing
  35 ;; commands.
  36
  37 ;;; Usage:
  38 ;; Selecting a face from the menu or typing the keyboard equivalent will
  39 ;; change the region to use that face.  If you use transient-mark-mode and the
  40 ;; region is not active, the face will be remembered and used for the next
  41 ;; insertion.  It will be forgotten if you move point or make other
  42 ;; modifications before inserting or typing anything.
  43 ;;
  44 ;; Faces can be selected from the keyboard as well.
  45 ;; The standard keybindings are M-g (or ESC g) + letter:
  46 ;; M-g i = "set italic",  M-g b = "set bold", etc.
  47
  48 ;;; Customization:
  49 ;; An alternative set of keybindings that may be easier to type can be set up
  50 ;; using "Alt" or "Hyper" keys.  This requires that you either have or create
  51 ;; an Alt or Hyper key on your keyboard.  On my keyboard, there is a key
  52 ;; labeled "Alt", but to make it act as an Alt key I have to put this command
  53 ;; into my .xinitrc:
  54 ;;    xmodmap -e "add Mod3 = Alt_L"
  55 ;; Or, I can make it into a Hyper key with this:
  56 ;;    xmodmap -e "keysym Alt_L = Hyper_L" -e "add Mod2 = Hyper_L"
  57 ;; Check with local X-perts for how to do it on your system.
  58 ;; Then you can define your keybindings with code like this in your .emacs:
  59 ;;   (setq facemenu-keybindings
  60 ;;    '((default     . [?\H-d])
  61 ;;      (bold        . [?\H-b])
  62 ;;      (italic      . [?\H-i])
  63 ;;      (bold-italic . [?\H-l])
  64 ;;      (underline   . [?\H-u])))
  65 ;;   (setq facemenu-keymap global-map)
  66 ;;   (setq facemenu-key nil)
  67 ;;   (define-key global-map [?\H-c] 'facemenu-set-foreground) ; set fg color
  68 ;;   (define-key global-map [?\H-C] 'facemenu-set-background) ; set bg color
  69 ;;   (require 'facemenu)
  70 ;;
  71 ;; The order of the faces that appear in the menu and their keybindings can be
  72 ;; controlled by setting the variables `facemenu-keybindings' and
  73 ;; `facemenu-new-faces-at-end'.  List faces that you don't use in documents
  74 ;; (eg, `region') in `facemenu-unlisted-faces'.
  75
  76 ;;; Known Problems:
  77 ;; Bold and Italic do not combine to create bold-italic if you select them
  78 ;; both, although most other combinations (eg bold + underline + some color)
  79 ;; do the intuitive thing.
  80 ;;
  81 ;; There is at present no way to display what the faces look like in
  82 ;; the menu itself.
  83 ;;
  84 ;; `list-faces-display' shows the faces in a different order than
  85 ;; this menu, which could be confusing.  I do /not/ sort the list
  86 ;; alphabetically, because I like the default order: it puts the most
  87 ;; basic, common fonts first.
  88 ;;
  89 ;; Please send me any other problems, comments or ideas.
  90
  91 ;;; Code:
  92
  93 (provide 'facemenu)
  94
  95 ;;; Provide some binding for startup:
  96 ;;;###autoload (define-key global-map "\M-g" 'facemenu-keymap)
  97 ;;;###autoload (autoload 'facemenu-keymap "facemenu" "Keymap for face-changing commands." t 'keymap)
  98
  99 (defvar facemenu-key "\M-g"
 100   "Prefix key to use for facemenu commands.")
 101
 102 (defvar facemenu-keybindings
 103   '((default     . "d")
 104     (bold        . "b")
 105     (italic      . "i")
 106     (bold-italic . "l") ; {bold} intersect {italic} = {l}
 107     (underline   . "u"))
 108   "Alist of interesting faces and keybindings.
 109 Each element is itself a list: the car is the name of the face,
 110 the next element is the key to use as a keyboard equivalent of the menu item;
 111 the binding is made in facemenu-keymap.
 112
 113 The faces specifically mentioned in this list are put at the top of
 114 the menu, in the order specified.  All other faces which are defined,
 115 except for those in `facemenu-unlisted-faces', are listed after them,
 116 but get no keyboard equivalents.
 117
 118 If you change this variable after loading facemenu.el, you will need to call
 119 `facemenu-update' to make it take effect.")
 120
 121 (defvar facemenu-new-faces-at-end t
 122   "Where in the menu to insert newly-created faces.
 123 This should be nil to put them at the top of the menu, or t to put them
 124 just before \"Other\" at the end.")
 125
 126 (defvar facemenu-unlisted-faces
 127   '(modeline region secondary-selection highlight scratch-face
 128     font-lock-comment-face font-lock-string-face font-lock-keyword-face
 129     font-lock-function-name-face font-lock-variable-name-face
 130     font-lock-type-face font-lock-reference-face)
 131   "List of faces not to include in the Face menu.
 132 Set this before loading facemenu.el, or call `facemenu-update' after
 133 changing it.
 134
 135 If this variable is t, no faces will be added to the menu.  This is useful for
 136 temporarily turning off the feature that automatically adds faces to the menu
 137 when they are created.")
 138
 139 ;;;###autoload
 140 (defvar facemenu-face-menu
 141   (let ((map (make-sparse-keymap "Face")))
 142     (define-key map "o" (cons "Other..." 'facemenu-set-face))
 143     map)
 144   "Menu keymap for faces.")
 145 ;;;###autoload
 146 (defalias 'facemenu-face-menu facemenu-face-menu)
 147
 148 ;;;###autoload
 149 (defvar facemenu-foreground-menu
 150   (let ((map (make-sparse-keymap "Foreground Color")))
 151     (define-key map "o" (cons "Other..." 'facemenu-set-foreground))
 152     map)
 153   "Menu keymap for foreground colors.")
 154 ;;;###autoload
 155 (defalias 'facemenu-foreground-menu facemenu-foreground-menu)
 156
 157 ;;;###autoload
 158 (defvar facemenu-background-menu
 159   (let ((map (make-sparse-keymap "Background Color")))
 160     (define-key map "o" (cons "Other..." 'facemenu-set-background))
 161     map)
 162   "Menu keymap for background colors")
 163 ;;;###autoload
 164 (defalias 'facemenu-background-menu facemenu-background-menu)
 165
 166 ;;;###autoload
 167 (defvar facemenu-special-menu
 168   (let ((map (make-sparse-keymap "Special")))
 169     (define-key map [?s] (cons "Remove Special" 'facemenu-remove-special))
 170     (define-key map [?t] (cons "Intangible" 'facemenu-set-intangible))
 171     (define-key map [?v] (cons "Invisible" 'facemenu-set-invisible))
 172     (define-key map [?r] (cons "Read-Only" 'facemenu-set-read-only))
 173     map)
 174   "Menu keymap for non-face text-properties.")
 175 ;;;###autoload
 176 (defalias 'facemenu-special-menu facemenu-special-menu)
 177
 178 ;;;###autoload
 179 (defvar facemenu-justification-menu
 180   (let ((map (make-sparse-keymap "Justification")))
 181     (define-key map [?c] (cons "Center" 'set-justification-center))
 182     (define-key map [?b] (cons "Full" 'set-justification-full))
 183     (define-key map [?r] (cons "Right" 'set-justification-right))
 184     (define-key map [?l] (cons "Left" 'set-justification-left))
 185     (define-key map [?u] (cons "Unfilled" 'set-justification-none))
 186     map)
 187   "Submenu for text justification commands.")
 188 ;;;###autoload
 189 (defalias 'facemenu-justification-menu facemenu-justification-menu)
 190
 191 ;;;###autoload
 192 (defvar facemenu-indentation-menu
 193   (let ((map (make-sparse-keymap "Indentation")))
 194     (define-key map [decrease-right-margin]
 195       (cons "Indent Right Less" 'decrease-right-margin))
 196     (define-key map [increase-right-margin]
 197       (cons "Indent Right More" 'increase-right-margin))
 198     (define-key map [decrease-left-margin]
 199       (cons "Indent Less" 'decrease-left-margin))
 200     (define-key map [increase-left-margin]
 201       (cons "Indent More" 'increase-left-margin))
 202     map)
 203   "Submenu for indentation commands.")
 204 ;;;###autoload
 205 (defalias 'facemenu-indentation-menu facemenu-indentation-menu)
 206
 207 ;; This is split up to avoid an overlong line in loaddefs.el.
 208 ;;;###autoload
 209 (defvar facemenu-menu nil
 210   "Facemenu top-level menu keymap.")
 211 ;;;###autoload
 212 (setq facemenu-menu (make-sparse-keymap "Text Properties"))
 213 ;;;###autoload
 214 (let ((map facemenu-menu))
 215   (define-key map [dc] (cons "Display Colors" 'list-colors-display))
 216   (define-key map [df] (cons "Display Faces" 'list-faces-display))
 217   (define-key map [dp] (cons "List Properties" 'list-text-properties-at))
 218   (define-key map [ra] (cons "Remove All" 'facemenu-remove-all))
 219   (define-key map [rm] (cons "Remove Properties" 'facemenu-remove-props))
 220   (define-key map [s1] (list "-----------------")))
 221 ;;;###autoload
 222 (let ((map facemenu-menu))
 223   (define-key map [in] (cons "Indentation" 'facemenu-indentation-menu))
 224   (define-key map [ju] (cons "Justification" 'facemenu-justification-menu))
 225   (define-key map [s2] (list "-----------------"))
 226   (define-key map [sp] (cons "Special Properties" 'facemenu-special-menu))
 227   (define-key map [bg] (cons "Background Color" 'facemenu-background-menu))
 228   (define-key map [fg] (cons "Foreground Color" 'facemenu-foreground-menu))
 229   (define-key map [fc] (cons "Face" 'facemenu-face-menu)))
 230 ;;;###autoload
 231 (defalias 'facemenu-menu facemenu-menu)
 232
 233 (defvar facemenu-keymap
 234   (let ((map (make-sparse-keymap "Set face")))
 235     (define-key map "o" (cons "Other..." 'facemenu-set-face))
 236     map)
 237   "Keymap for face-changing commands.
 238 `Facemenu-update' fills in the keymap according to the bindings
 239 requested in `facemenu-keybindings'.")
 240 (defalias 'facemenu-keymap facemenu-keymap)
 241
 242 ;;; Internal Variables
 243
 244 (defvar facemenu-color-alist nil
 245   ;; Don't initialize here; that doesn't work if preloaded.
 246   "Alist of colors, used for completion.
 247 If null, `facemenu-read-color' will set it.")
 248
 249 (defun facemenu-update ()
 250   "Add or update the \"Face\" menu in the menu bar.
 251 You can call this to update things if you change any of the menu configuration
 252 variables."
 253   (interactive)
 254
 255   ;; Global bindings:
 256   (define-key global-map [C-down-mouse-2] 'facemenu-menu)
 257   (if facemenu-key (define-key global-map facemenu-key 'facemenu-keymap))
 258
 259   ;; Add each defined face to the menu.
 260   (facemenu-iterate 'facemenu-add-new-face
 261                     (facemenu-complete-face-list facemenu-keybindings)))
 262
 263 ;;;###autoload
 264 (defun facemenu-set-face (face &optional start end)
 265   "Add FACE to the region or next character typed.
 266 It will be added to the top of the face list; any faces lower on the list that
 267 will not show through at all will be removed.
 268
 269 Interactively, the face to be used is read with the minibuffer.
 270
 271 If the region is active and there is no prefix argument,
 272 this command sets the region to the requested face.
 273
 274 Otherwise, this command specifies the face for the next character
 275 inserted.  Moving point or switching buffers before
 276 typing a character to insert cancels the specification."
 277   (interactive (list (read-face-name "Use face: ")))
 278   (barf-if-buffer-read-only)
 279   (facemenu-add-new-face face)
 280   (if (and mark-active (not current-prefix-arg))
 281       (let ((start (or start (region-beginning)))
 282             (end (or end (region-end))))
 283         (facemenu-add-face face start end))
 284     (facemenu-self-insert-face face)))
 285
 286 ;;;###autoload
 287 (defun facemenu-set-foreground (color &optional start end)
 288   "Set the foreground color of the region or next character typed.
 289 The color is prompted for.  A face named `fg:color' is used \(or created).
 290 If the region is active, it will be set to the requested face.  If
 291 it is inactive \(even if mark-even-if-inactive is set) the next
 292 character that is typed \(via `self-insert-command') will be set to
 293 the selected face.  Moving point or switching buffers before
 294 typing a character cancels the request."
 295   (interactive (list (facemenu-read-color "Foreground color: ")))
 296   (let ((face (intern (concat "fg:" color))))
 297     (or (facemenu-get-face face)
 298         (error "Unknown color: %s" color))
 299     (facemenu-set-face face start end)))
 300
 301 ;;;###autoload
 302 (defun facemenu-set-background (color &optional start end)
 303   "Set the background color of the region or next character typed.
 304 The color is prompted for.  A face named `bg:color' is used \(or created).
 305 If the region is active, it will be set to the requested face.  If
 306 it is inactive \(even if mark-even-if-inactive is set) the next
 307 character that is typed \(via `self-insert-command') will be set to
 308 the selected face.  Moving point or switching buffers before
 309 typing a character cancels the request."
 310   (interactive (list (facemenu-read-color "Background color: ")))
 311   (let ((face (intern (concat "bg:" color))))
 312     (or (facemenu-get-face face)
 313         (error "Unknown color: %s" color))
 314     (facemenu-set-face face start end)))
 315
 316 ;;;###autoload
 317 (defun facemenu-set-face-from-menu (face start end)
 318   "Set the face of the region or next character typed.
 319 This function is designed to be called from a menu; the face to use
 320 is the menu item's name.
 321
 322 If the region is active and there is no prefix argument,
 323 this command sets the region to the requested face.
 324
 325 Otherwise, this command specifies the face for the next character
 326 inserted.  Moving point or switching buffers before
 327 typing a character to insert cancels the specification."
 328   (interactive (list last-command-event
 329                      (if (and mark-active (not current-prefix-arg))
 330                          (region-beginning))
 331                      (if (and mark-active (not current-prefix-arg))
 332                          (region-end))))
 333   (barf-if-buffer-read-only)
 334   (facemenu-get-face face)
 335   (if start
 336       (facemenu-add-face face start end)
 337     (facemenu-self-insert-face face)))
 338
 339 (defun facemenu-self-insert-face (face)
 340   (setq self-insert-face (if (eq last-command self-insert-face-command)
 341                              (cons face (if (listp self-insert-face)
 342                                             self-insert-face
 343                                           (list self-insert-face)))
 344                            face)
 345         self-insert-face-command this-command))
 346
 347 ;;;###autoload
 348 (defun facemenu-set-invisible (start end)
 349   "Make the region invisible.
 350 This sets the `invisible' text property; it can be undone with
 351 `facemenu-remove-special'."
 352   (interactive "r")
 353   (put-text-property start end 'invisible t))
 354
 355 ;;;###autoload
 356 (defun facemenu-set-intangible (start end)
 357   "Make the region intangible: disallow moving into it.
 358 This sets the `intangible' text property; it can be undone with
 359 `facemenu-remove-special'."
 360   (interactive "r")
 361   (put-text-property start end 'intangible t))
 362
 363 ;;;###autoload
 364 (defun facemenu-set-read-only (start end)
 365   "Make the region unmodifiable.
 366 This sets the `read-only' text property; it can be undone with
 367 `facemenu-remove-special'."
 368   (interactive "r")
 369   (put-text-property start end 'read-only t))
 370
 371 ;;;###autoload
 372 (defun facemenu-remove-props (start end)
 373   "Remove all text properties that facemenu added to region."
 374   (interactive "*r") ; error if buffer is read-only despite the next line.
 375   (let ((inhibit-read-only t))
 376     (remove-text-properties
 377      start end '(face nil invisible nil intangible nil
 378                       read-only nil category nil))))
 379
 380 ;;;###autoload
 381 (defun facemenu-remove-all (start end)
 382   "Remove all text properties from the region."
 383   (interactive "*r") ; error if buffer is read-only despite the next line.
 384   (let ((inhibit-read-only t))
 385     (set-text-properties start end nil)))
 386
 387 ;;;###autoload
 388 (defun facemenu-remove-special (start end)
 389   "Remove all the \"special\" text properties from the region.
 390 These special properties include `invisible', `intangible' and `read-only'."
 391   (interactive "*r") ; error if buffer is read-only despite the next line.
 392   (let ((inhibit-read-only t))
 393     (remove-text-properties
 394      start end '(invisible nil intangible nil read-only nil))))
 395
 396 ;;;###autoload
 397 (defun list-text-properties-at (p)
 398   "Pop up a buffer listing text-properties at LOCATION."
 399   (interactive "d")
 400   (let ((props (text-properties-at p)))
 401     (if (null props)
 402         (message "None")
 403       (with-output-to-temp-buffer "*Text Properties*"
 404         (princ (format "Text properties at %d:\n\n" p))
 405         (while props
 406           (princ (format "%-20s %S\n"
 407                          (car props) (car (cdr props))))
 408           (setq props (cdr (cdr props))))))))
 409
 410 ;;;###autoload
 411 (defun facemenu-read-color (&optional prompt)
 412   "Read a color using the minibuffer."
 413   (let ((col (completing-read (or prompt "Color: ")
 414                               (or facemenu-color-alist
 415                                   (if (eq 'x window-system)
 416                                       (mapcar 'list (x-defined-colors))))
 417                               nil t)))
 418     (if (equal "" col)
 419         nil
 420       col)))
 421
 422 ;;;###autoload
 423 (defun list-colors-display (&optional list)
 424   "Display names of defined colors, and show what they look like.
 425 If the optional argument LIST is non-nil, it should be a list of
 426 colors to display.  Otherwise, this command computes a list
 427 of colors that the current display can handle."
 428   (interactive)
 429   (if (and (null list) (eq 'x window-system))
 430       (progn
 431         (setq list (x-defined-colors))
 432         ;; Delete duplicate colors.
 433         (let ((l list))
 434           (while (cdr l)
 435             (if (facemenu-color-equal (car l) (car (cdr l)))
 436                 (setcdr l (cdr (cdr l)))
 437               (setq l (cdr l)))))))
 438   (with-output-to-temp-buffer "*Colors*"
 439     (save-excursion
 440       (set-buffer standard-output)
 441       (let ((facemenu-unlisted-faces t)
 442             s)
 443         (while list
 444           (setq s (point))
 445           (insert (car list))
 446           (indent-to 20)
 447           (put-text-property s (point) 'face
 448                              (facemenu-get-face
 449                               (intern (concat "bg:" (car list)))))
 450           (setq s (point))
 451           (insert "  " (car list) "\n")
 452           (put-text-property s (point) 'face
 453                              (facemenu-get-face
 454                               (intern (concat "fg:" (car list)))))
 455           (setq list (cdr list)))))))
 456
 457 (defun facemenu-color-equal (a b)
 458   "Return t if colors A and B are the same color.
 459 A and B should be strings naming colors.
 460 This function queries the window-system server to find out what the
 461 color names mean.  It returns nil if the colors differ or if it can't
 462 determine the correct answer."
 463   (cond ((equal a b) t)
 464         ((and (eq 'x window-system)
 465               (equal (x-color-values a) (x-color-values b))))))
 466
 467 (defun facemenu-add-face (face start end)
 468   "Add FACE to text between START and END.
 469 For each section of that region that has a different face property, FACE will
 470 be consed onto it, and other faces that are completely hidden by that will be
 471 removed from the list.
 472
 473 As a special case, if FACE is `default', then the region is left with NO face
 474 text property.  Otherwise, selecting the default face would not have any
 475 effect."
 476   (interactive "*xFace:\nr")
 477   (if (eq face 'default)
 478       (remove-text-properties start end '(face default))
 479     (let ((part-start start) part-end)
 480       (while (not (= part-start end))
 481         (setq part-end (next-single-property-change part-start 'face nil end))
 482         (let ((prev (get-text-property part-start 'face)))
 483           (put-text-property part-start part-end 'face
 484                              (if (null prev)
 485                                  face
 486                                (facemenu-discard-redundant-faces
 487                                 (cons face
 488                                       (if (listp prev) prev (list prev)))))))
 489         (setq part-start part-end)))))
 490
 491 (defun facemenu-discard-redundant-faces (face-list &optional mask)
 492   "Remove from FACE-LIST any faces that won't show at all.
 493 This means they have no non-nil elements that aren't also non-nil in an
 494 earlier face."
 495   (let ((useful nil))
 496     (cond ((null face-list) nil)
 497           ((null mask)
 498            (cons (car face-list)
 499                  (facemenu-discard-redundant-faces
 500                   (cdr face-list)
 501                   (copy-sequence (internal-get-face (car face-list))))))
 502           ((let ((i (length mask))
 503                  (face (internal-get-face (car face-list))))
 504              (while (>= (setq i (1- i)) 0)
 505                (if (and (aref face i)
 506                         (not (aref mask i)))
 507                    (progn (setq useful t)
 508                           (aset mask i t))))
 509              useful)
 510            (cons (car face-list)
 511                  (facemenu-discard-redundant-faces (cdr face-list) mask)))
 512           (t (facemenu-discard-redundant-faces (cdr face-list) mask)))))
 513
 514 (defun facemenu-get-face (symbol)
 515   "Make sure FACE exists.
 516 If not, it is created.  If it is created and is of the form `fg:color', then
 517 set the foreground to that color. If of the form `bg:color', set the
 518 background.  In any case, add it to the appropriate menu.  Returns the face,
 519 or nil if given a bad color."
 520   (if (or (internal-find-face symbol)
 521           (let* ((face (make-face symbol))
 522                  (name (symbol-name symbol))
 523                  (color (substring name 3)))
 524             (cond ((string-match "^fg:" name)
 525                    (set-face-foreground face color)
 526                    (and (eq 'x window-system) (x-color-defined-p color)))
 527                   ((string-match "^bg:" name)
 528                    (set-face-background face color)
 529                    (and (eq 'x window-system) (x-color-defined-p color)))
 530                   (t))))
 531       symbol))
 532
 533 (defun facemenu-add-new-face (face)
 534   "Add a FACE to the appropriate Face menu.
 535 Automatically called when a new face is created."
 536   (let* ((name (symbol-name face))
 537          (menu (cond ((string-match "^fg:" name)
 538                       (setq name (substring name 3))
 539                       'facemenu-foreground-menu)
 540                      ((string-match "^bg:" name)
 541                       (setq name (substring name 3))
 542                       'facemenu-background-menu)
 543                      (t 'facemenu-face-menu)))
 544          (key (cdr (assoc face facemenu-keybindings)))
 545          function menu-val)
 546     (cond ((eq t facemenu-unlisted-faces))
 547           ((memq face facemenu-unlisted-faces))
 548           (key ; has a keyboard equivalent.  These go at the front.
 549            (setq function (intern (concat "facemenu-set-" name)))
 550            (fset function
 551                  (` (lambda () (interactive)
 552                       (facemenu-set-face (quote (, face))))))
 553            (define-key 'facemenu-keymap key (cons name function))
 554            (define-key menu key (cons name function)))
 555           ((facemenu-iterate ; check if equivalent face is already in the menu
 556             (lambda (m) (and (listp m)
 557                              (symbolp (car m))
 558                              (face-equal (car m) face)))
 559             (cdr (symbol-function menu))))
 560           (t   ; No keyboard equivalent.  Figure out where to put it:
 561            (setq key (vector face)
 562                  function 'facemenu-set-face-from-menu
 563                  menu-val (symbol-function menu))
 564            (if (and facemenu-new-faces-at-end
 565                    (> (length menu-val) 3))
 566                (define-key-after menu-val key (cons name function)
 567                  (car (nth (- (length menu-val) 3) menu-val)))
 568              (define-key menu key (cons name function))))))
 569   nil) ; Return nil for facemenu-iterate
 570
 571 (defun facemenu-complete-face-list (&optional oldlist)
 572   "Return list of all faces that are look different.
 573 Starts with given ALIST of faces, and adds elements only if they display
 574 differently from any face already on the list.
 575 The faces on ALIST will end up at the end of the returned list, in reverse
 576 order."
 577   (let ((list (nreverse (mapcar 'car oldlist))))
 578     (facemenu-iterate
 579      (lambda (new-face)
 580        (if (not (memq new-face list))
 581            (setq list (cons new-face list)))
 582        nil)
 583      (nreverse (face-list)))
 584     list))
 585
 586 (defun facemenu-iterate (func iterate-list)
 587   "Apply FUNC to each element of LIST until one returns non-nil.
 588 Returns the non-nil value it found, or nil if all were nil."
 589   (while (and iterate-list (not (funcall func (car iterate-list))))
 590     (setq iterate-list (cdr iterate-list)))
 591   (car iterate-list))
 592
 593 (facemenu-update)
 594
 595 ;;; facemenu.el ends here