lisp/menu-bar.el

   1 ;;; menu-bar.el --- define a default menu bar.
   2
   3 ;; Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
   4
   5 ;; Author: RMS
   6 ;; Keywords: internal
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 2, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 ;; Boston, MA 02111-1307, USA.
  24
  25 ;; Avishai Yacobi suggested some menu rearrangements.
  26
  27 ;;; Code:
  28
  29 ;;; User options:
  30
  31 (defcustom buffers-menu-max-size 10
  32   "*Maximum number of entries which may appear on the Buffers menu.
  33 If this is 10, then only the ten most-recently-selected buffers are shown.
  34 If this is nil, then all buffers are shown.
  35 A large number or nil slows down menu responsiveness."
  36   :type '(choice integer
  37                  (const :tag "All" nil))
  38   :group 'mouse)
  39
  40 ;; Don't clobber an existing menu-bar keymap, to preserve any menu-bar key
  41 ;; definitions made in loaddefs.el.
  42 (or (lookup-key global-map [menu-bar])
  43     (define-key global-map [menu-bar] (make-sparse-keymap "menu-bar")))
  44 (defvar menu-bar-help-menu (make-sparse-keymap "Help"))
  45
  46 ;; Force Help item to come last, after the major mode's own items.
  47 ;; The symbol used to be called `help', but that gets confused with the
  48 ;; help key.
  49 (setq menu-bar-final-items '(help-menu))
  50
  51 (define-key global-map [menu-bar help-menu] (cons "Help" menu-bar-help-menu))
  52 (defvar menu-bar-search-menu (make-sparse-keymap "Search"))
  53 (define-key global-map [menu-bar search] (cons "Search" menu-bar-search-menu))
  54 (defvar menu-bar-edit-menu (make-sparse-keymap "Edit"))
  55 (define-key global-map [menu-bar edit] (cons "Edit" menu-bar-edit-menu))
  56 (defvar menu-bar-tools-menu (make-sparse-keymap "Tools"))
  57 (define-key global-map [menu-bar tools] (cons "Tools" menu-bar-tools-menu))
  58 (defvar menu-bar-files-menu (make-sparse-keymap "Files"))
  59 (define-key global-map [menu-bar files] (cons "Files" menu-bar-files-menu))
  60
  61 ;; This alias is for compatibility with 19.28 and before.
  62 (defvar menu-bar-file-menu menu-bar-files-menu)
  63 \f
  64 (defvar vc-menu-map (make-sparse-keymap "Version Control"))
  65
  66 (define-key menu-bar-tools-menu [gdb] '("Debugger..." . gdb))
  67 (define-key menu-bar-tools-menu [compile] '("Compile..." . compile))
  68 (define-key menu-bar-tools-menu [grep] '("Search Files..." . grep))
  69
  70 (define-key menu-bar-tools-menu [separator-1]
  71   '("--"))
  72
  73 (define-key menu-bar-tools-menu [calendar] '("Display Calendar" . calendar))
  74 (define-key menu-bar-tools-menu [compose-mail] '("Send Mail" . compose-mail))
  75 (define-key menu-bar-tools-menu [rmail] '("Read Mail" . rmail))
  76 (define-key menu-bar-tools-menu [gnus] '("Read Net News" . gnus))
  77
  78 (define-key menu-bar-tools-menu [separator-vc]
  79   '("--"))
  80
  81 (define-key menu-bar-tools-menu [vc]
  82   (cons "Version Control" vc-menu-map))
  83
  84 (define-key menu-bar-tools-menu [separator-compare]
  85   '("--"))
  86
  87 (define-key menu-bar-tools-menu [epatch]
  88   '("Apply Patch" . menu-bar-epatch-menu))
  89 (define-key menu-bar-tools-menu [ediff-merge]
  90   '("Merge" . menu-bar-ediff-merge-menu))
  91 (define-key menu-bar-tools-menu [compare]
  92   '("Compare" . menu-bar-ediff-menu))
  93
  94 (define-key menu-bar-tools-menu [separator-print]
  95   '("--"))
  96
  97 (put 'print-region 'menu-enable 'mark-active)
  98 (put 'ps-print-region-with-faces 'menu-enable 'mark-active)
  99
 100 (define-key menu-bar-tools-menu [ps-print-region]
 101   '("Postscript Print Region" . ps-print-region-with-faces))
 102 (define-key menu-bar-tools-menu [ps-print-buffer]
 103   '("Postscript Print Buffer" . ps-print-buffer-with-faces))
 104 (define-key menu-bar-tools-menu [print-region]
 105   '("Print Region" . print-region))
 106 (define-key menu-bar-tools-menu [print-buffer]
 107   '("Print Buffer" . print-buffer))
 108 \f
 109 (define-key menu-bar-files-menu [exit-emacs]
 110   '("Exit Emacs" . save-buffers-kill-emacs))
 111
 112 (define-key menu-bar-files-menu [separator-exit]
 113   '("--"))
 114
 115 (define-key menu-bar-files-menu [one-window]
 116   '("One Window" . delete-other-windows))
 117
 118 (define-key menu-bar-files-menu [split-window]
 119   '("Split Window" . split-window-vertically))
 120
 121 (if (fboundp 'delete-frame)
 122     (progn
 123       ;; Don't use delete-frame as event name
 124       ;; because that is a special event.
 125       (define-key menu-bar-files-menu [delete-this-frame]
 126         '("Delete Frame" . delete-frame))
 127       (define-key menu-bar-files-menu [make-frame-on-display]
 128         '("Open New Display..." . make-frame-on-display))
 129       (define-key menu-bar-files-menu [make-frame]
 130         '("Make New Frame" . make-frame))))
 131
 132 (define-key menu-bar-files-menu [separator-buffers]
 133   '("--"))
 134
 135 (define-key menu-bar-files-menu [kill-buffer]
 136   '("Kill Current Buffer" . kill-this-buffer))
 137 (define-key menu-bar-files-menu [insert-file]
 138   '("Insert File..." . insert-file))
 139 (define-key menu-bar-files-menu [revert-buffer]
 140   '("Revert Buffer" . revert-buffer))
 141 (define-key menu-bar-files-menu [write-file]
 142   '("Save Buffer As..." . write-file))
 143 (define-key menu-bar-files-menu [save-buffer] '("Save Buffer" . save-buffer))
 144 (define-key menu-bar-files-menu [dired] '("Open Directory..." . dired))
 145 (define-key menu-bar-files-menu [open-file] '("Open File..." . find-file))
 146
 147 \f
 148 (defun nonincremental-search-forward (string)
 149   "Read a string and search for it nonincrementally."
 150   (interactive "sSearch for string: ")
 151   (if (equal string "")
 152       (search-forward (car search-ring))
 153     (isearch-update-ring string nil)
 154     (search-forward string)))
 155
 156 (defun nonincremental-search-backward (string)
 157   "Read a string and search backward for it nonincrementally."
 158   (interactive "sSearch for string: ")
 159   (if (equal string "")
 160       (search-backward (car search-ring))
 161     (isearch-update-ring string nil)
 162     (search-backward string)))
 163
 164 (defun nonincremental-re-search-forward (string)
 165   "Read a regular expression and search for it nonincrementally."
 166   (interactive "sSearch for regexp: ")
 167   (if (equal string "")
 168       (re-search-forward (car regexp-search-ring))
 169     (isearch-update-ring string t)
 170     (re-search-forward string)))
 171
 172 (defun nonincremental-re-search-backward (string)
 173   "Read a regular expression and search backward for it nonincrementally."
 174   (interactive "sSearch for regexp: ")
 175   (if (equal string "")
 176       (re-search-backward (car regexp-search-ring))
 177     (isearch-update-ring string t)
 178     (re-search-backward string)))
 179
 180 (defun nonincremental-repeat-search-forward ()
 181   "Search forward for the previous search string."
 182   (interactive)
 183   (search-forward (car search-ring)))
 184
 185 (defun nonincremental-repeat-search-backward ()
 186   "Search backward for the previous search string."
 187   (interactive)
 188   (search-backward (car search-ring)))
 189
 190 (defun nonincremental-repeat-re-search-forward ()
 191   "Search forward for the previous regular expression."
 192   (interactive)
 193   (re-search-forward (car regexp-search-ring)))
 194
 195 (defun nonincremental-repeat-re-search-backward ()
 196   "Search backward for the previous regular expression."
 197   (interactive)
 198   (re-search-backward (car regexp-search-ring)))
 199
 200 (define-key menu-bar-search-menu [query-replace-regexp]
 201   '("Query Replace Regexp..." . query-replace-regexp))
 202 (define-key menu-bar-search-menu [query-replace]
 203   '("Query Replace..." . query-replace))
 204 (define-key menu-bar-search-menu [find-tag]
 205   '("Find Tag..." . find-tag))
 206 (define-key menu-bar-search-menu [bookmark]
 207   '("Bookmarks" . menu-bar-bookmark-map))
 208
 209 (define-key menu-bar-search-menu [separator-search]
 210   '("--"))
 211
 212 (define-key menu-bar-search-menu [repeat-regexp-back]
 213   '("Repeat Regexp Backwards" . nonincremental-repeat-re-search-backward))
 214 (define-key menu-bar-search-menu [repeat-search-back]
 215   '("Repeat Backwards" . nonincremental-repeat-search-backward))
 216 (define-key menu-bar-search-menu [repeat-regexp-fwd]
 217   '("Repeat Regexp" . nonincremental-repeat-re-search-forward))
 218 (define-key menu-bar-search-menu [repeat-search-fwd]
 219   '("Repeat Search" . nonincremental-repeat-search-forward))
 220
 221 (define-key menu-bar-search-menu [separator-repeat]
 222   '("--"))
 223
 224 (define-key menu-bar-search-menu [re-search-backward]
 225   '("Regexp Search Backwards..." . nonincremental-re-search-backward))
 226 (define-key menu-bar-search-menu [search-backward]
 227   '("Search Backwards..." . nonincremental-search-backward))
 228 (define-key menu-bar-search-menu [re-search-forward]
 229   '("Regexp Search..." . nonincremental-re-search-forward))
 230 (define-key menu-bar-search-menu [search-forward]
 231   '("Search..." . nonincremental-search-forward))
 232 \f
 233 (if (fboundp 'start-process)
 234     (define-key menu-bar-edit-menu [spell] '("Spell" . ispell-menu-map)))
 235 (define-key menu-bar-edit-menu [fill] '("Fill" . fill-region))
 236 (define-key menu-bar-edit-menu [props] '("Text Properties" . facemenu-menu))
 237
 238 (define-key menu-bar-edit-menu [separator-edit]
 239   '("--"))
 240
 241 (define-key menu-bar-edit-menu [clear] '("Clear" . delete-region))
 242
 243 (define-key menu-bar-edit-menu [paste] '("Paste Most Recent" . yank))
 244
 245 (defvar yank-menu (cons "Select Yank" nil))
 246 (fset 'yank-menu (cons 'keymap yank-menu))
 247 (define-key menu-bar-edit-menu [select-paste] '("Select and Paste" . yank-menu))
 248 (define-key menu-bar-edit-menu [copy] '("Copy" . menu-bar-kill-ring-save))
 249 (define-key menu-bar-edit-menu [cut] '("Cut" . kill-region))
 250 (define-key menu-bar-edit-menu [undo] '("Undo" . undo))
 251
 252 (defun menu-bar-kill-ring-save (beg end)
 253   (interactive "r")
 254   (if (mouse-region-match)
 255       (message "Select a region with the mouse does `copy' automatically")
 256     (kill-ring-save beg end)))
 257
 258 (put 'fill-region 'menu-enable '(and mark-active (not buffer-read-only)))
 259 (put 'kill-region 'menu-enable '(and mark-active (not buffer-read-only)))
 260 (put 'menu-bar-kill-ring-save 'menu-enable 'mark-active)
 261 (put 'yank 'menu-enable '(and (x-selection-exists-p) (not buffer-read-only)))
 262 (put 'yank-menu 'menu-enable '(and (cdr yank-menu) (not buffer-read-only)))
 263 (put 'delete-region 'menu-enable '(and mark-active
 264                                        (not buffer-read-only)
 265                                        (not (mouse-region-match))))
 266 (put 'undo 'menu-enable '(and (not buffer-read-only)
 267                               (if (eq last-command 'undo)
 268                                   pending-undo-list
 269                                 (consp buffer-undo-list))))
 270 (put 'query-replace 'menu-enable '(not buffer-read-only))
 271 (put 'query-replace-regexp 'menu-enable '(not buffer-read-only))
 272
 273 (autoload 'ispell-menu-map "ispell" nil t 'keymap)
 274
 275 ;; These are alternative definitions for the cut, paste and copy
 276 ;; menu items.  Use them if your system expects these to use the clipboard.
 277
 278 (put 'clipboard-kill-region 'menu-enable 'mark-active)
 279 (put 'clipboard-kill-ring-save 'menu-enable 'mark-active)
 280 (put 'clipboard-yank 'menu-enable
 281      '(or (x-selection-exists-p) (x-selection-exists-p 'CLIPBOARD)))
 282
 283 (defun clipboard-yank ()
 284   "Reinsert the last stretch of killed text, or the clipboard contents."
 285   (interactive)
 286   (let ((x-select-enable-clipboard t))
 287     (yank)))
 288
 289 (defun clipboard-kill-ring-save (beg end)
 290   "Copy region to kill ring, and save in the X clipboard."
 291   (interactive "r")
 292   (let ((x-select-enable-clipboard t))
 293     (kill-ring-save beg end)))
 294
 295 (defun clipboard-kill-region (beg end)
 296   "Kill the region, and save it in the X clipboard."
 297   (interactive "r")
 298   (let ((x-select-enable-clipboard t))
 299     (kill-region beg end)))
 300
 301 (defun menu-bar-enable-clipboard ()
 302   "Make CUT, PASTE and COPY (keys and menu bar items) use the clipboard.
 303 Do the same for the keys of the same name."
 304   (interactive)
 305   ;; We can't use constant list structure here because it becomes pure,
 306   ;; and because it gets modified with cache data.
 307   (define-key menu-bar-edit-menu [paste]
 308     (cons "Paste" 'clipboard-yank))
 309   (define-key menu-bar-edit-menu [copy]
 310     (cons "Copy" 'clipboard-kill-ring-save))
 311   (define-key menu-bar-edit-menu [cut]
 312     (cons "Cut" 'clipboard-kill-region))
 313
 314   (define-key global-map [f20] 'clipboard-kill-region)
 315   (define-key global-map [f16] 'clipboard-kill-ring-save)
 316   (define-key global-map [f18] 'clipboard-yank)
 317   ;; X11R6 versions
 318   (define-key global-map [cut] 'clipboard-kill-region)
 319   (define-key global-map [copy] 'clipboard-kill-ring-save)
 320   (define-key global-map [paste] 'clipboard-yank))
 321 \f
 322
 323 ;;; Menu support
 324
 325 (defvar menu-bar-custom-menu (make-sparse-keymap "Customize"))
 326
 327 (define-key menu-bar-custom-menu [custom-menu-update]
 328   '("Update This Menu" . custom-menu-update))
 329 (define-key menu-bar-custom-menu [customize-apropos]
 330   '("Apropos..." . customize-apropos))
 331 (define-key menu-bar-custom-menu [customize-group]
 332   '("Specific Group..." . customize-group))
 333 (define-key menu-bar-custom-menu [customize-face]
 334   '("Specific Face..." . customize-face))
 335 (define-key menu-bar-custom-menu [customize-variable]
 336   '("Specific Variable..." . customize-variable))
 337 (define-key menu-bar-custom-menu [customize]
 338   '("Browse Hierarchy of User Options" . customize))
 339
 340 (define-key menu-bar-help-menu [emacs-version]
 341   '("Show Version" . emacs-version))
 342 (define-key menu-bar-help-menu [report-emacs-bug]
 343   '("Send Bug Report..." . report-emacs-bug))
 344 (define-key menu-bar-help-menu [finder-by-keyword]
 345   '("Find Lisp Packages..." . finder-by-keyword))
 346 (define-key menu-bar-help-menu [emacs-tutorial]
 347   '("Emacs Tutorial" . help-with-tutorial))
 348 (define-key menu-bar-help-menu [man]
 349   '("Man..." . manual-entry))
 350 (define-key menu-bar-help-menu [describe-variable]
 351   '("Describe Variable..." . describe-variable))
 352 (define-key menu-bar-help-menu [describe-function]
 353   '("Describe Function..." . describe-function))
 354 (define-key menu-bar-help-menu [describe-key]
 355   '("Describe Key..." . describe-key))
 356 (define-key menu-bar-help-menu [list-keybindings]
 357   '("List Keybindings" . describe-bindings))
 358 (define-key menu-bar-help-menu [command-apropos]
 359   '("Command Apropos..." . command-apropos))
 360 (define-key menu-bar-help-menu [describe-mode]
 361   '("Describe Mode" . describe-mode))
 362 (define-key menu-bar-help-menu [info] '("Browse Manuals" . info))
 363 (define-key menu-bar-help-menu [emacs-faq] '("Emacs FAQ" . view-emacs-FAQ))
 364 (define-key menu-bar-help-menu [emacs-news] '("Emacs News" . view-emacs-news))
 365 (define-key menu-bar-help-menu [customize-menu]
 366   (cons "Customize" menu-bar-custom-menu))
 367
 368 (defun kill-this-buffer ()      ; for the menubar
 369   "Kills the current buffer."
 370   (interactive)
 371   (kill-buffer (current-buffer)))
 372
 373 (defun kill-this-buffer-enabled-p ()
 374   (let ((count 0)
 375         (buffers (buffer-list)))
 376     (while buffers
 377       (or (string-match "^ " (buffer-name (car buffers)))
 378           (setq count (1+ count)))
 379       (setq buffers (cdr buffers)))
 380     (and (not (window-minibuffer-p (frame-selected-window menu-updating-frame)))
 381          (> count 1))))
 382
 383 (put 'kill-this-buffer 'menu-enable '(kill-this-buffer-enabled-p))
 384
 385 (put 'save-buffer 'menu-enable
 386      '(and (buffer-modified-p)
 387            (not (window-minibuffer-p (frame-selected-window menu-updating-frame)))))
 388
 389 (put 'write-file 'menu-enable
 390      '(not (window-minibuffer-p (frame-selected-window menu-updating-frame))))
 391
 392 (put 'find-file 'menu-enable
 393      '(not (window-minibuffer-p (frame-selected-window menu-updating-frame))))
 394
 395 (put 'dired 'menu-enable
 396      '(not (window-minibuffer-p (frame-selected-window menu-updating-frame))))
 397
 398 (put 'insert-file 'menu-enable
 399      '(not (window-minibuffer-p (frame-selected-window menu-updating-frame))))
 400
 401 (put 'revert-buffer 'menu-enable
 402      '(or revert-buffer-function revert-buffer-insert-file-contents-function
 403           (and (buffer-file-name)
 404                (or (buffer-modified-p)
 405                    (not (verify-visited-file-modtime (current-buffer)))))))
 406
 407 ;; Permit deleting frame if it would leave a visible or iconified frame.
 408 (put 'delete-frame 'menu-enable
 409      '(delete-frame-enabled-p))
 410
 411 (defun delete-frame-enabled-p ()
 412   "Return non-nil if `delete-frame' should be enabled in the menu bar."
 413   (let ((frames (frame-list))
 414         (count 0))
 415     (while frames
 416       (if (frame-visible-p (car frames))
 417           (setq count (1+ count)))
 418       (setq frames (cdr frames)))
 419     (> count 1)))
 420
 421 (put 'advertised-undo 'menu-enable
 422      '(and (not (eq t buffer-undo-list))
 423            (if (eq last-command 'undo)
 424                (and (boundp 'pending-undo-list)
 425                     pending-undo-list)
 426              buffer-undo-list)))
 427
 428 (defcustom yank-menu-length 20
 429   "*Maximum length to display in the yank-menu."
 430   :type 'integer
 431   :group 'mouse)
 432
 433 (defun menu-bar-update-yank-menu (string old)
 434   (let ((front (car (cdr yank-menu)))
 435         (menu-string (if (<= (length string) yank-menu-length)
 436                          string
 437                        (concat
 438                         (substring string 0 (/ yank-menu-length 2))
 439                         "..."
 440                         (substring string (- (/ yank-menu-length 2)))))))
 441     ;; Don't let the menu string be all dashes
 442     ;; because that has a special meaning in a menu.
 443     (if (string-match "\\`-+\\'" menu-string)
 444         (setq menu-string (concat menu-string " ")))
 445     ;; If we're supposed to be extending an existing string, and that
 446     ;; string really is at the front of the menu, then update it in place.
 447     (if (and old (or (eq old (car front))
 448                      (string= old (car front))))
 449         (progn
 450           (setcar front string)
 451           (setcar (cdr front) menu-string))
 452       (setcdr yank-menu
 453               (cons
 454                (cons string (cons menu-string 'menu-bar-select-yank))
 455                (cdr yank-menu)))))
 456   (if (> (length (cdr yank-menu)) kill-ring-max)
 457       (setcdr (nthcdr kill-ring-max yank-menu) nil)))
 458
 459 (defun menu-bar-select-yank ()
 460   (interactive "*")
 461   (push-mark (point))
 462   (insert last-command-event))
 463 \f
 464 ;; This definition is just to show what this looks like.
 465 ;; It gets overridden below when menu-bar-update-buffers is called.
 466 (define-key global-map [menu-bar buffer]
 467   (cons "Buffers" (make-sparse-keymap "Buffers")))
 468
 469 (defvar list-buffers-directory nil)
 470
 471 (defvar menu-bar-update-buffers-maxbuf)
 472
 473 (defun menu-bar-select-buffer ()
 474   (interactive)
 475   (switch-to-buffer last-command-event))
 476
 477 (defun menu-bar-select-frame ()
 478   (interactive)
 479   (make-frame-visible last-command-event)
 480   (raise-frame last-command-event)
 481   (select-frame last-command-event))
 482
 483 (defun menu-bar-update-buffers-1 (elt)
 484   (cons (format
 485          (format "%%%ds  %%s%%s  %%s" menu-bar-update-buffers-maxbuf)
 486          (cdr elt)
 487          (if (buffer-modified-p (car elt))
 488              "*" " ")
 489          (save-excursion
 490            (set-buffer (car elt))
 491            (if buffer-read-only "%" " "))
 492          (let ((file
 493                 (or (buffer-file-name (car elt))
 494                     (save-excursion
 495                       (set-buffer (car elt))
 496                       list-buffers-directory)
 497                     "")))
 498            (setq file (or (file-name-directory file)
 499                           ""))
 500            (if (> (length file) 20)
 501                (setq file (concat "..." (substring file -17))))
 502            file))
 503         (car elt)))
 504
 505 (defvar menu-bar-buffers-menu-list-buffers-entry nil)
 506
 507 (defun menu-bar-update-buffers ()
 508   ;; If user discards the Buffers item, play along.
 509   (and (lookup-key (current-global-map) [menu-bar buffer])
 510        (frame-or-buffer-changed-p)
 511        (let ((buffers (buffer-list))
 512              (frames (frame-list))
 513              (maxlen 0)
 514              buffers-menu frames-menu)
 515          ;; If requested, list only the N most recently selected buffers.
 516          (if (and (integerp buffers-menu-max-size)
 517                   (> buffers-menu-max-size 1))
 518              (if (> (length buffers) buffers-menu-max-size)
 519                  (setcdr (nthcdr buffers-menu-max-size buffers) nil)))
 520
 521          ;; Make the menu of buffers proper.
 522          (setq buffers-menu
 523                (cons "Select Buffer"
 524                      (let* ((buffer-list
 525                              (mapcar 'list buffers))
 526                             tail
 527                             (menu-bar-update-buffers-maxbuf 0)
 528                             alist
 529                             head)
 530                        ;; Put into each element of buffer-list
 531                        ;; the name for actual display,
 532                        ;; perhaps truncated in the middle.
 533                        (setq tail buffer-list)
 534                        (while tail
 535                          (let ((name (buffer-name (car (car tail)))))
 536                            (setcdr (car tail)
 537                                    (if (> (length name) 27)
 538                                        (concat (substring name 0 12)
 539                                                "..."
 540                                                (substring name -12))
 541                                      name)))
 542                          (setq tail (cdr tail)))
 543                        ;; Compute the maximum length of any name.
 544                        (setq tail buffer-list)
 545                        (while tail
 546                          (or (eq ?\ (aref (cdr (car tail)) 0))
 547                              (setq menu-bar-update-buffers-maxbuf
 548                                    (max menu-bar-update-buffers-maxbuf
 549                                         (length (cdr (car tail))))))
 550                          (setq tail (cdr tail)))
 551                        ;; Set ALIST to an alist of the form
 552                        ;; ITEM-STRING . BUFFER
 553                        (setq tail buffer-list)
 554                        (while tail
 555                          (let ((elt (car tail)))
 556                            (or (eq ?\ (aref (cdr elt) 0))
 557                                (setq alist (cons
 558                                             (menu-bar-update-buffers-1 elt)
 559                                             alist)))
 560                            (and alist (> (length (car (car alist))) maxlen)
 561                                 (setq maxlen (length (car (car alist))))))
 562                          (setq tail (cdr tail)))
 563                        (setq alist (nreverse alist))
 564                        ;; Make the menu item for list-buffers
 565                        ;; or reuse the one we already have.
 566                        ;; The advantage in reusing one
 567                        ;; is that it already has the keyboard equivalent
 568                        ;; cached, so we save the time to look that up again.
 569                        (or menu-bar-buffers-menu-list-buffers-entry
 570                            (setq menu-bar-buffers-menu-list-buffers-entry
 571                                  (cons
 572                                   'list-buffers
 573                                   (cons
 574                                    ""
 575                                    'list-buffers))))
 576                        ;; Update the item string for menu's new width.
 577                        (setcar (cdr menu-bar-buffers-menu-list-buffers-entry)
 578                                (concat (make-string (max (- (/ maxlen 2) 8) 0)
 579                                                     ?\ )
 580                                        "List All Buffers"))
 581                        ;; Now make the actual list of items,
 582                        ;; ending with the list-buffers item.
 583                        (nconc (mapcar '(lambda (pair)
 584                                          ;; This is somewhat risque, to use
 585                                          ;; the buffer name itself as the event
 586                                          ;; type to define, but it works.
 587                                          ;; It would not work to use the buffer
 588                                          ;; since a buffer as an event has its
 589                                          ;; own meaning.
 590                                          (nconc (list (buffer-name (cdr pair))
 591                                                       (car pair)
 592                                                       (cons nil nil))
 593                                                 'menu-bar-select-buffer))
 594                                       alist)
 595                               (list menu-bar-buffers-menu-list-buffers-entry)))))
 596
 597
 598          ;; Make a Frames menu if we have more than one frame.
 599          (if (cdr frames)
 600              (let ((name (concat (make-string (max (- (/ maxlen 2) 3) 0)
 601                                               ?\ )
 602                                  "Frames"))
 603                    (frames-menu
 604                     (cons 'keymap
 605                           (cons "Select Frame"
 606                                 (mapcar '(lambda (frame)
 607                                            (nconc (list frame
 608                                                         (cdr (assq 'name
 609                                                                    (frame-parameters frame)))
 610                                                         (cons nil nil))
 611                                                   'menu-bar-select-frame))
 612                                         frames)))))
 613                ;; Put it underneath the Buffers menu.
 614                (setq buffers-menu (cons (cons 'frames (cons name frames-menu))
 615                                         buffers-menu))))
 616          (if buffers-menu
 617              (setq buffers-menu (cons 'keymap buffers-menu)))
 618          (define-key (current-global-map) [menu-bar buffer]
 619            (cons "Buffers" buffers-menu)))))
 620
 621 (add-hook 'menu-bar-update-hook 'menu-bar-update-buffers)
 622
 623 (menu-bar-update-buffers)
 624
 625 ;; this version is too slow
 626 ;;;(defun format-buffers-menu-line (buffer)
 627 ;;;  "Returns a string to represent the given buffer in the Buffer menu.
 628 ;;;nil means the buffer shouldn't be listed.  You can redefine this."
 629 ;;;  (if (string-match "\\` " (buffer-name buffer))
 630 ;;;      nil
 631 ;;;    (save-excursion
 632 ;;;     (set-buffer buffer)
 633 ;;;     (let ((size (buffer-size)))
 634 ;;;       (format "%s%s %-19s %6s %-15s %s"
 635 ;;;            (if (buffer-modified-p) "*" " ")
 636 ;;;            (if buffer-read-only "%" " ")
 637 ;;;            (buffer-name)
 638 ;;;            size
 639 ;;;            mode-name
 640 ;;;            (or (buffer-file-name) ""))))))
 641 \f
 642 ;;; Set up a menu bar menu for the minibuffer.
 643
 644 (mapcar
 645  (function
 646   (lambda (map)
 647     (define-key map [menu-bar minibuf]
 648       (cons "Minibuf" (make-sparse-keymap "Minibuf")))))
 649  (list minibuffer-local-ns-map
 650        minibuffer-local-must-match-map
 651        minibuffer-local-isearch-map
 652        minibuffer-local-map
 653        minibuffer-local-completion-map))
 654
 655 (mapcar
 656  (function
 657   (lambda (map)
 658     (define-key map [menu-bar minibuf ?\?]
 659       '("List Completions" . minibuffer-completion-help))
 660     (define-key map [menu-bar minibuf space]
 661       '("Complete Word" . minibuffer-complete-word))
 662     (define-key map [menu-bar minibuf tab]
 663       '("Complete" . minibuffer-complete))
 664     ))
 665  (list minibuffer-local-must-match-map
 666        minibuffer-local-completion-map))
 667
 668 (mapcar
 669  (function
 670   (lambda (map)
 671     (define-key map [menu-bar minibuf quit]
 672       '("Quit" . keyboard-escape-quit))
 673     (define-key map [menu-bar minibuf return]
 674       '("Enter" . exit-minibuffer))
 675     ))
 676  (list minibuffer-local-ns-map
 677        minibuffer-local-must-match-map
 678        minibuffer-local-isearch-map
 679        minibuffer-local-map
 680        minibuffer-local-completion-map))
 681 \f
 682 (defvar menu-bar-mode nil)
 683
 684 (defun menu-bar-mode (flag)
 685   "Toggle display of a menu bar on each frame.
 686 This command applies to all frames that exist and frames to be
 687 created in the future.
 688 With a numeric argument, if the argument is negative,
 689 turn off menu bars; otherwise, turn on menu bars."
 690  (interactive "P")
 691
 692   ;; Make menu-bar-mode and default-frame-alist consistent.
 693   (let ((default (assq 'menu-bar-lines default-frame-alist)))
 694     (if default
 695         (setq menu-bar-mode (not (eq (cdr default) 0)))
 696       (setq default-frame-alist
 697             (cons (cons 'menu-bar-lines (if menu-bar-mode 1 0))
 698                   default-frame-alist))))
 699
 700   ;; Toggle or set the mode, according to FLAG.
 701  (setq menu-bar-mode (if (null flag) (not menu-bar-mode)
 702                        (> (prefix-numeric-value flag) 0)))
 703
 704  ;; Apply it to default-frame-alist.
 705  (let ((parameter (assq 'menu-bar-lines default-frame-alist)))
 706    (if (consp parameter)
 707        (setcdr parameter (if menu-bar-mode 1 0))
 708      (setq default-frame-alist
 709            (cons (cons 'menu-bar-lines (if menu-bar-mode 1 0))
 710                  default-frame-alist))))
 711
 712  ;; Apply it to existing frames.
 713  (let ((frames (frame-list)))
 714    (while frames
 715      (let ((height (cdr (assq 'height (frame-parameters (car frames))))))
 716        (modify-frame-parameters (car frames)
 717                                 (list (cons 'menu-bar-lines
 718                                           (if menu-bar-mode 1 0))))
 719        (modify-frame-parameters (car frames)
 720                                 (list (cons 'height height))))
 721      (setq frames (cdr frames)))))
 722
 723 (provide 'menu-bar)
 724
 725 ;;; menu-bar.el ends here