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