lisp/menu-bar.el

   1 ;;; menu-bar.el --- define a default menu bar.
   2
   3 ;; Author: RMS
   4 ;; Keywords: internal
   5
   6 ;; Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
   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
  22 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  23
  24 ;;; Code:
  25
  26 ;; Don't clobber an existing menu-bar keymap, to preserve any menu-bar key
  27 ;; definitions made in loaddefs.el.
  28 (or (lookup-key global-map [menu-bar])
  29     (define-key global-map [menu-bar] (make-sparse-keymap "menu-bar")))
  30 (defvar menu-bar-help-menu (make-sparse-keymap "Help"))
  31
  32 ;; Force Help item to come last, after the major mode's own items.
  33 ;; The symbol used to be called `help', but that gets confused with the
  34 ;; help key.
  35 (setq menu-bar-final-items '(help-menu))
  36
  37 (define-key global-map [menu-bar help-menu] (cons "Help" menu-bar-help-menu))
  38 (defvar menu-bar-search-menu (make-sparse-keymap "Search"))
  39 (define-key global-map [menu-bar search] (cons "Search" menu-bar-search-menu))
  40 (defvar menu-bar-edit-menu (make-sparse-keymap "Edit"))
  41 (define-key global-map [menu-bar edit] (cons "Edit" menu-bar-edit-menu))
  42 (defvar menu-bar-tools-menu (make-sparse-keymap "Tools"))
  43 (define-key global-map [menu-bar tools] (cons "Tools" menu-bar-tools-menu))
  44 (defvar menu-bar-files-menu (make-sparse-keymap "Files"))
  45 (define-key global-map [menu-bar files] (cons "Files" menu-bar-files-menu))
  46
  47 ;; This alias is for compatibility with 19.28 and before.
  48 (defvar menu-bar-file-menu menu-bar-files-menu)
  49 \f
  50 (defvar vc-menu-map (make-sparse-keymap "Version Control"))
  51
  52 (define-key menu-bar-tools-menu [calendar] '("Display Calendar" . calendar))
  53 (define-key menu-bar-tools-menu [rmail] '("Read Mail" . rmail))
  54 (define-key menu-bar-tools-menu [gnus] '("Read Net News" . gnus))
  55
  56 (define-key menu-bar-tools-menu [separator-vc]
  57   '("--"))
  58
  59 (define-key menu-bar-tools-menu [vc-menu]
  60   (cons "Version Control" vc-menu-map))
  61
  62 (define-key menu-bar-tools-menu [separator-compare]
  63   '("--"))
  64
  65 (define-key menu-bar-tools-menu [epatch]
  66   '("Apply Patch" . menu-bar-epatch-menu))
  67 (define-key menu-bar-tools-menu [ediff-merge]
  68   '("Merge" . menu-bar-ediff-merge-menu))
  69 (define-key menu-bar-tools-menu [compare]
  70   '("Compare" . menu-bar-ediff-menu))
  71
  72 (define-key menu-bar-tools-menu [separator-print]
  73   '("--"))
  74
  75 (put 'print-region 'menu-enable 'mark-active)
  76 (put 'ps-print-region-with-faces 'menu-enable 'mark-active)
  77
  78 (define-key menu-bar-tools-menu [ps-print-region]
  79   '("Postscript Print Region" . ps-print-region-with-faces))
  80 (define-key menu-bar-tools-menu [ps-print-buffer]
  81   '("Postscript Print Buffer" . ps-print-buffer-with-faces))
  82 (define-key menu-bar-tools-menu [print-region]
  83   '("Print Region" . print-region))
  84 (define-key menu-bar-tools-menu [print-buffer]
  85   '("Print Buffer" . print-buffer))
  86 \f
  87 (define-key menu-bar-files-menu [exit-emacs]
  88   '("Exit Emacs" . save-buffers-kill-emacs))
  89
  90 (define-key menu-bar-files-menu [separator-exit]
  91   '("--"))
  92
  93 (define-key menu-bar-files-menu [one-window]
  94   '("One Window" . delete-other-windows))
  95
  96 (define-key menu-bar-files-menu [split-window]
  97   '("Split Window" . split-window-vertically))
  98
  99 (if (fboundp 'delete-frame)
 100     (progn
 101       (define-key menu-bar-files-menu [delete-frame]
 102         '("Delete Frame" . delete-frame))
 103       (define-key menu-bar-files-menu [make-frame-on-display]
 104         '("Open New Display..." . make-frame-on-display))
 105       (define-key menu-bar-files-menu [make-frame]
 106         '("Make New Frame" . make-frame))))
 107
 108 (define-key menu-bar-files-menu [separator-buffers]
 109   '("--"))
 110
 111 (define-key menu-bar-files-menu [kill-buffer]
 112   '("Kill Current Buffer" . kill-this-buffer))
 113 (define-key menu-bar-files-menu [insert-file]
 114   '("Insert File..." . insert-file))
 115 (define-key menu-bar-files-menu [revert-buffer]
 116   '("Revert Buffer" . revert-buffer))
 117 (define-key menu-bar-files-menu [write-file]
 118   '("Save Buffer As..." . write-file))
 119 (define-key menu-bar-files-menu [save-buffer] '("Save Buffer" . save-buffer))
 120 (define-key menu-bar-files-menu [dired] '("Open Directory..." . dired))
 121 (define-key menu-bar-files-menu [open-file] '("Open File..." . find-file))
 122
 123 ;; This is just one element of the ediff menu--the first.
 124 (define-key menu-bar-ediff-menu [window]
 125   '("This Window And Next Window" . compare-windows))
 126 \f
 127 (defun nonincremental-search-forward (string)
 128   "Read a string and search for it nonincrementally."
 129   (interactive "sSearch for string: ")
 130   (if (equal string "")
 131       (search-forward (car search-ring))
 132     (isearch-update-ring string nil)
 133     (search-forward string)))
 134
 135 (defun nonincremental-search-backward (string)
 136   "Read a string and search backward for it nonincrementally."
 137   (interactive "sSearch for string: ")
 138   (if (equal string "")
 139       (search-backward (car search-ring))
 140     (isearch-update-ring string nil)
 141     (search-backward string)))
 142
 143 (defun nonincremental-re-search-forward (string)
 144   "Read a regular expression and search for it nonincrementally."
 145   (interactive "sSearch for regexp: ")
 146   (if (equal string "")
 147       (re-search-forward (car regexp-search-ring))
 148     (isearch-update-ring string t)
 149     (re-search-forward string)))
 150
 151 (defun nonincremental-re-search-backward (string)
 152   "Read a regular expression and search backward for it nonincrementally."
 153   (interactive "sSearch for regexp: ")
 154   (if (equal string "")
 155       (re-search-backward (car regexp-search-ring))
 156     (isearch-update-ring string t)
 157     (re-search-backward string)))
 158
 159 (defun nonincremental-repeat-search-forward ()
 160   "Search forward for the previous search string."
 161   (interactive)
 162   (search-forward (car search-ring)))
 163
 164 (defun nonincremental-repeat-search-backward ()
 165   "Search backward for the previous search string."
 166   (interactive)
 167   (search-backward (car search-ring)))
 168
 169 (defun nonincremental-repeat-re-search-forward ()
 170   "Search forward for the previous regular expression."
 171   (interactive)
 172   (re-search-forward (car regexp-search-ring)))
 173
 174 (defun nonincremental-repeat-re-search-backward ()
 175   "Search backward for the previous regular expression."
 176   (interactive)
 177   (re-search-backward (car regexp-search-ring)))
 178
 179 (define-key menu-bar-search-menu [query-replace-regexp]
 180   '("Query Replace Regexp..." . query-replace-regexp))
 181 (define-key menu-bar-search-menu [query-replace]
 182   '("Query Replace..." . query-replace))
 183 (define-key menu-bar-search-menu [find-tag]
 184   '("Find Tag..." . find-tag))
 185 (put 'find-tag 'menu-enable 'tags-table-list)
 186 (define-key menu-bar-search-menu [bookmark]
 187   '("Bookmarks" . menu-bar-bookmark-map))
 188
 189 (define-key menu-bar-search-menu [separator-search]
 190   '("--"))
 191
 192 (define-key menu-bar-search-menu [nonincremental-repeat-re-search-back]
 193   '("Repeat Regexp Backwards" . nonincremental-repeat-re-search-backward))
 194 (define-key menu-bar-search-menu [nonincremental-repeat-search-back]
 195   '("Repeat Backwards" . nonincremental-repeat-search-backward))
 196 (define-key menu-bar-search-menu [nonincremental-repeat-re-search-fwd]
 197   '("Repeat Regexp" . nonincremental-repeat-re-search-forward))
 198 (define-key menu-bar-search-menu [nonincremental-repeat-search-fwd]
 199   '("Repeat Search" . nonincremental-repeat-search-forward))
 200
 201 (define-key menu-bar-search-menu [separator-repeat]
 202   '("--"))
 203
 204 (define-key menu-bar-search-menu [re-search-back]
 205   '("Regexp Search Backwards..." . nonincremental-re-search-backward))
 206 (define-key menu-bar-search-menu [search-back]
 207   '("Search Backwards..." . nonincremental-search-backward))
 208 (define-key menu-bar-search-menu [re-search-fwd]
 209   '("Regexp Search..." . nonincremental-re-search-forward))
 210 (define-key menu-bar-search-menu [search-fwd]
 211   '("Search..." . nonincremental-search-forward))
 212 \f
 213 (if (fboundp 'start-process)
 214     (define-key menu-bar-edit-menu [spell] '("Spell" . ispell-menu-map)))
 215 (define-key menu-bar-edit-menu [fill] '("Fill" . fill-region))
 216 (define-key menu-bar-edit-menu [props] '("Text Properties" . facemenu-menu))
 217
 218 (define-key menu-bar-edit-menu [separator-edit]
 219   '("--"))
 220
 221 (define-key menu-bar-edit-menu [clear] '("Clear" . delete-region))
 222
 223 (define-key menu-bar-edit-menu [paste] '("Paste Most Recent" . yank))
 224
 225 (defvar yank-menu (cons "Select Yank" nil))
 226 (fset 'yank-menu (cons 'keymap yank-menu))
 227 (define-key menu-bar-edit-menu [select-paste] '("Select and Paste" . yank-menu))
 228 (define-key menu-bar-edit-menu [copy] '("Copy" . menu-bar-kill-ring-save))
 229 (define-key menu-bar-edit-menu [cut] '("Cut" . kill-region))
 230 (define-key menu-bar-edit-menu [undo] '("Undo" . undo))
 231
 232 (defun menu-bar-kill-ring-save (beg end)
 233   (interactive "r")
 234   (if (mouse-region-match)
 235       (message "Select a region with the mouse does `copy' automatically")
 236     (kill-ring-save beg end)))
 237
 238 (put 'fill-region 'menu-enable 'mark-active)
 239 (put 'kill-region 'menu-enable 'mark-active)
 240 (put 'menu-bar-kill-ring-save 'menu-enable 'mark-active)
 241 (put 'yank 'menu-enable '(x-selection-exists-p))
 242 (put 'yank-menu 'menu-enable '(cdr yank-menu))
 243 (put 'delete-region 'menu-enable '(and mark-active
 244                                        (not (mouse-region-match))))
 245 (put 'undo 'menu-enable '(if (eq last-command 'undo)
 246                              pending-undo-list
 247                            (consp buffer-undo-list)))
 248 (put 'query-replace 'menu-enable '(not buffer-read-only))
 249
 250 (autoload 'ispell-menu-map "ispell" nil t 'keymap)
 251
 252 ;; These are alternative definitions for the cut, paste and copy
 253 ;; menu items.  Use them if your system expects these to use the clipboard.
 254
 255 (put 'clipboard-kill-region 'menu-enable 'mark-active)
 256 (put 'clipboard-kill-ring-save 'menu-enable 'mark-active)
 257 (put 'clipboard-yank 'menu-enable
 258      '(or (x-selection-exists-p) (x-selection-exists-p 'CLIPBOARD)))
 259
 260 (defun clipboard-yank ()
 261   "Reinsert the last stretch of killed text, or the clipboard contents."
 262   (interactive)
 263   (let ((x-select-enable-clipboard t))
 264     (yank)))
 265
 266 (defun clipboard-kill-ring-save (beg end)
 267   "Copy region to kill ring, and save in the X clipboard."
 268   (interactive "r")
 269   (let ((x-select-enable-clipboard t))
 270     (kill-ring-save beg end)))
 271
 272 (defun clipboard-kill-region (beg end)
 273   "Kill the region, and save it in the X clipboard."
 274   (interactive "r")
 275   (let ((x-select-enable-clipboard t))
 276     (kill-region beg end)))
 277
 278 (defun menu-bar-enable-clipboard ()
 279   "Make CUT, PASTE and COPY (keys and menu bar items) use the clipboard.
 280 Do the same for the keys of the same name."
 281   (interactive)
 282   ;; We can't use constant list structure here because it becomes pure,
 283   ;; and because it gets modified with cache data.
 284   (define-key menu-bar-edit-menu [paste]
 285     (cons "Paste" 'clipboard-yank))
 286   (define-key menu-bar-edit-menu [copy]
 287     (cons "Copy" 'clipboard-kill-ring-save))
 288   (define-key menu-bar-edit-menu [cut]
 289     (cons "Cut" 'clipboard-kill-region))
 290
 291   (define-key global-map [f20] 'clipboard-kill-region)
 292   (define-key global-map [f16] 'clipboard-kill-ring-save)
 293   (define-key global-map [f18] 'clipboard-yank)
 294   ;; X11R6 versions
 295   (define-key global-map [cut] 'clipboard-kill-region)
 296   (define-key global-map [copy] 'clipboard-kill-ring-save)
 297   (define-key global-map [paste] 'clipboard-yank))
 298 \f
 299 (define-key menu-bar-help-menu [emacs-version]
 300   '("Show Version" . emacs-version))
 301 (define-key menu-bar-help-menu [report-emacs-bug]
 302   '("Send Bug Report..." . report-emacs-bug))
 303 (define-key menu-bar-help-menu [emacs-tutorial]
 304   '("Emacs Tutorial" . help-with-tutorial))
 305 (define-key menu-bar-help-menu [man] '("Man..." . manual-entry))
 306 (define-key menu-bar-help-menu [describe-variable]
 307   '("Describe Variable..." . describe-variable))
 308 (define-key menu-bar-help-menu [describe-function]
 309   '("Describe Function..." . describe-function))
 310 (define-key menu-bar-help-menu [describe-key]
 311   '("Describe Key..." . describe-key))
 312 (define-key menu-bar-help-menu [list-keybindings]
 313   '("List Keybindings" . describe-bindings))
 314 (define-key menu-bar-help-menu [command-apropos]
 315   '("Command Apropos..." . command-apropos))
 316 (define-key menu-bar-help-menu [describe-mode]
 317   '("Describe Mode" . describe-mode))
 318 (define-key menu-bar-help-menu [info] '("Browse Manuals" . info))
 319 (define-key menu-bar-help-menu [emacs-faq] '("Emacs FAQ" . view-emacs-FAQ))
 320 (define-key menu-bar-help-menu [emacs-news] '("Emacs News" . view-emacs-news))
 321
 322 (defun kill-this-buffer ()      ; for the menubar
 323   "Kills the current buffer."
 324   (interactive)
 325   (kill-buffer (current-buffer)))
 326
 327 (defun kill-this-buffer-enabled-p ()
 328   (let ((count 0)
 329         (buffers (buffer-list)))
 330     (while buffers
 331       (or (string-match "^ " (buffer-name (car buffers)))
 332           (setq count (1+ count)))
 333       (setq buffers (cdr buffers)))
 334     (and (not (window-minibuffer-p (selected-window)))
 335          (> count 1))))
 336
 337 (put 'kill-this-buffer 'menu-enable '(kill-this-buffer-enabled-p))
 338
 339 (put 'save-buffer 'menu-enable
 340      '(and (buffer-modified-p)
 341            (not (window-minibuffer-p (selected-window)))))
 342
 343 (put 'write-file 'menu-enable
 344      '(not (window-minibuffer-p (selected-window))))
 345
 346 (put 'find-file 'menu-enable
 347      '(not (window-minibuffer-p (selected-window))))
 348
 349 (put 'dired 'menu-enable
 350      '(not (window-minibuffer-p (selected-window))))
 351
 352 (put 'insert-file 'menu-enable
 353      '(not (window-minibuffer-p (selected-window))))
 354
 355 (put 'revert-buffer 'menu-enable
 356      '(or revert-buffer-function revert-buffer-insert-file-contents-function
 357           (and (buffer-file-name)
 358                (or (buffer-modified-p)
 359                    (not (verify-visited-file-modtime (current-buffer)))))))
 360
 361 ;; Permit deleting frame if it would leave a visible or iconified frame.
 362 (put 'delete-frame 'menu-enable
 363      '(delete-frame-enabled-p))
 364
 365 (defun delete-frame-enabled-p ()
 366   "Return non-nil if `delete-frame' should be enabled in the menu bar."
 367   (let ((frames (frame-list))
 368               (count 0))
 369           (while frames
 370             (if (frame-visible-p (car frames))
 371                 (setq count (1+ count)))
 372             (setq frames (cdr frames)))
 373           (> count 1)))
 374
 375 (put 'advertised-undo 'menu-enable
 376      '(and (not (eq t buffer-undo-list))
 377            (if (eq last-command 'undo)
 378                (and (boundp 'pending-undo-list)
 379                     pending-undo-list)
 380              buffer-undo-list)))
 381
 382 (defvar yank-menu-length 20
 383   "*Maximum length to display in the yank-menu.")
 384
 385 (defun menu-bar-update-yank-menu (string old)
 386   (let ((front (car (cdr yank-menu)))
 387         (menu-string (if (<= (length string) yank-menu-length)
 388                          string
 389                        (concat
 390                         (substring string 0 (/ yank-menu-length 2))
 391                         "..."
 392                         (substring string (- (/ yank-menu-length 2)))))))
 393     ;; If we're supposed to be extending an existing string, and that
 394     ;; string really is at the front of the menu, then update it in place.
 395     (if (and old (or (eq old (car front))
 396                      (string= old (car front))))
 397         (progn
 398           (setcar front string)
 399           (setcar (cdr front) menu-string))
 400       (setcdr yank-menu
 401               (cons
 402                (cons string (cons menu-string 'menu-bar-select-yank))
 403                (cdr yank-menu)))))
 404   (if (> (length (cdr yank-menu)) kill-ring-max)
 405       (setcdr (nthcdr kill-ring-max yank-menu) nil)))
 406
 407 (defun menu-bar-select-yank ()
 408   (interactive "*")
 409   (push-mark (point))
 410   (insert last-command-event))
 411 \f
 412 (define-key global-map [menu-bar buffer] '("Buffers" . menu-bar-buffers))
 413
 414 (defalias 'menu-bar-buffers (make-sparse-keymap "Buffers"))
 415
 416 (defvar buffers-menu-max-size 10
 417   "*Maximum number of entries which may appear on the Buffers menu.
 418 If this is 10, then only the ten most-recently-selected buffers are shown.
 419 If this is nil, then all buffers are shown.
 420 A large number or nil slows down menu responsiveness.")
 421
 422 (defvar list-buffers-directory nil)
 423
 424 (defvar menu-bar-update-buffers-maxbuf)
 425
 426 (defun menu-bar-select-buffer ()
 427   (interactive)
 428   (switch-to-buffer last-command-event))
 429
 430 (defun menu-bar-select-frame ()
 431   (interactive)
 432   (make-frame-visible last-command-event)
 433   (raise-frame last-command-event)
 434   (select-frame last-command-event))
 435
 436 (defun menu-bar-update-buffers-1 (elt)
 437   (cons (format
 438          (format "%%%ds  %%s%%s  %%s" menu-bar-update-buffers-maxbuf)
 439          (cdr elt)
 440          (if (buffer-modified-p (car elt))
 441              "*" " ")
 442          (save-excursion
 443            (set-buffer (car elt))
 444            (if buffer-read-only "%" " "))
 445          (let ((file
 446                 (or (buffer-file-name (car elt))
 447                     (save-excursion
 448                       (set-buffer (car elt))
 449                       list-buffers-directory)
 450                     "")))
 451            (setq file (or (file-name-directory file)
 452                           ""))
 453            (if (> (length file) 20)
 454                (setq file (concat "..." (substring file -17))))
 455            file))
 456         (car elt)))
 457
 458 (defvar menu-bar-buffers-menu-list-buffers-entry nil)
 459
 460 (defun menu-bar-update-buffers ()
 461   ;; If user discards the Buffers item, play along.
 462   (and (lookup-key (current-global-map) [menu-bar buffer])
 463        (frame-or-buffer-changed-p)
 464        (let ((buffers (buffer-list))
 465              (frames (frame-list))
 466              buffers-menu frames-menu)
 467          ;; If requested, list only the N most recently selected buffers.
 468          (if (and (integerp buffers-menu-max-size)
 469                   (> buffers-menu-max-size 1))
 470              (if (> (length buffers) buffers-menu-max-size)
 471                  (setcdr (nthcdr buffers-menu-max-size buffers) nil)))
 472
 473          ;; Make the menu of buffers proper.
 474          (setq buffers-menu
 475                (cons "Select Buffer"
 476                      (let* ((buffer-list
 477                              (mapcar 'list buffers))
 478                             tail
 479                             (menu-bar-update-buffers-maxbuf 0)
 480                             (maxlen 0)
 481                             alist
 482                             head)
 483                        ;; Put into each element of buffer-list
 484                        ;; the name for actual display,
 485                        ;; perhaps truncated in the middle.
 486                        (setq tail buffer-list)
 487                        (while tail
 488                          (let ((name (buffer-name (car (car tail)))))
 489                            (setcdr (car tail)
 490                                    (if (> (length name) 27)
 491                                        (concat (substring name 0 12)
 492                                                "..."
 493                                                (substring name -12))
 494                                      name)))
 495                          (setq tail (cdr tail)))
 496                        ;; Compute the maximum length of any name.
 497                        (setq tail buffer-list)
 498                        (while tail
 499                          (or (eq ?\ (aref (cdr (car tail)) 0))
 500                              (setq menu-bar-update-buffers-maxbuf
 501                                    (max menu-bar-update-buffers-maxbuf
 502                                         (length (cdr (car tail))))))
 503                          (setq tail (cdr tail)))
 504                        ;; Set ALIST to an alist of the form
 505                        ;; ITEM-STRING . BUFFER
 506                        (setq tail buffer-list)
 507                        (while tail
 508                          (let ((elt (car tail)))
 509                            (or (eq ?\ (aref (cdr elt) 0))
 510                                (setq alist (cons
 511                                             (menu-bar-update-buffers-1 elt)
 512                                             alist)))
 513                            (and alist (> (length (car (car alist))) maxlen)
 514                                 (setq maxlen (length (car (car alist))))))
 515                          (setq tail (cdr tail)))
 516                        (setq alist (nreverse alist))
 517                        ;; Make the menu item for list-buffers
 518                        ;; or reuse the one we already have.
 519                        ;; The advantage in reusing one
 520                        ;; is that it already has the keyboard equivalent
 521                        ;; cached, so we save the time to look that up again.
 522                        (or menu-bar-buffers-menu-list-buffers-entry
 523                            (setq menu-bar-buffers-menu-list-buffers-entry
 524                                  (cons
 525                                   'list-buffers
 526                                   (cons
 527                                    ""
 528                                    'list-buffers))))
 529                        ;; Update the item string for menu's new width.
 530                        (setcar (cdr menu-bar-buffers-menu-list-buffers-entry)
 531                                (concat (make-string (max (- (/ maxlen 2) 8) 0)
 532                                                     ?\ )
 533                                        "List All Buffers"))
 534                        ;; Now make the actual list of items,
 535                        ;; ending with the list-buffers item.
 536                        (nconc (mapcar '(lambda (pair)
 537                                          ;; This is somewhat risque, to use
 538                                          ;; the buffer name itself as the event
 539                                          ;; type to define, but it works.
 540                                          ;; It would not work to use the buffer
 541                                          ;; since a buffer as an event has its
 542                                          ;; own meaning.
 543                                          (nconc (list (buffer-name (cdr pair))
 544                                                       (car pair)
 545                                                       (cons nil nil))
 546                                                 'menu-bar-select-buffer))
 547                                       alist)
 548                               (list menu-bar-buffers-menu-list-buffers-entry)))))
 549
 550
 551          ;; Make a Frames menu if we have more than one frame.
 552          (if (cdr frames)
 553              (setq frames-menu
 554                    (cons "Select Frame"
 555                          (mapcar '(lambda (frame)
 556                                     (nconc (list frame
 557                                                  (cdr (assq 'name
 558                                                             (frame-parameters frame)))
 559                                                  (cons nil nil))
 560                                            'menu-bar-select-frame))
 561                                  frames))))
 562          (if buffers-menu
 563              (setq buffers-menu (cons 'keymap buffers-menu)))
 564          (if frames-menu
 565              (setq frames-menu (cons 'keymap frames-menu)))
 566          (define-key (current-global-map) [menu-bar buffer]
 567            (cons "Buffers"
 568                  (if (and buffers-menu frames-menu)
 569                      (list 'keymap "Buffers and Frames"
 570                            (cons 'buffers (cons "Buffers" buffers-menu))
 571                            (cons 'frames (cons "Frames" frames-menu)))
 572                    (or buffers-menu frames-menu 'undefined)))))))
 573
 574 (add-hook 'menu-bar-update-hook 'menu-bar-update-buffers)
 575
 576 ;; this version is too slow
 577 ;;;(defun format-buffers-menu-line (buffer)
 578 ;;;  "Returns a string to represent the given buffer in the Buffer menu.
 579 ;;;nil means the buffer shouldn't be listed.  You can redefine this."
 580 ;;;  (if (string-match "\\` " (buffer-name buffer))
 581 ;;;      nil
 582 ;;;    (save-excursion
 583 ;;;     (set-buffer buffer)
 584 ;;;     (let ((size (buffer-size)))
 585 ;;;       (format "%s%s %-19s %6s %-15s %s"
 586 ;;;            (if (buffer-modified-p) "*" " ")
 587 ;;;            (if buffer-read-only "%" " ")
 588 ;;;            (buffer-name)
 589 ;;;            size
 590 ;;;            mode-name
 591 ;;;            (or (buffer-file-name) ""))))))
 592 \f
 593 (defvar menu-bar-mode nil)
 594
 595 (defun menu-bar-mode (flag)
 596   "Toggle display of a menu bar on each frame.
 597 This command applies to all frames that exist and frames to be
 598 created in the future.
 599 With a numeric argument, if the argument is negative,
 600 turn off menu bars; otherwise, turn on menu bars."
 601  (interactive "P")
 602
 603   ;; Make menu-bar-mode and default-frame-alist consistent.
 604   (let ((default (assq 'menu-bar-lines default-frame-alist)))
 605     (if default
 606         (setq menu-bar-mode (not (eq (cdr default) 0)))
 607       (setq default-frame-alist
 608             (cons (cons 'menu-bar-lines (if menu-bar-mode 1 0))
 609                   default-frame-alist))))
 610
 611   ;; Toggle or set the mode, according to FLAG.
 612  (setq menu-bar-mode (if (null flag) (not menu-bar-mode)
 613                        (> (prefix-numeric-value flag) 0)))
 614
 615  ;; Apply it to default-frame-alist.
 616  (let ((parameter (assq 'menu-bar-lines default-frame-alist)))
 617    (if (consp parameter)
 618        (setcdr parameter (if menu-bar-mode 1 0))
 619      (setq default-frame-alist
 620            (cons (cons 'menu-bar-lines (if menu-bar-mode 1 0))
 621                  default-frame-alist))))
 622
 623  ;; Apply it to existing frames.
 624  (let ((frames (frame-list)))
 625    (while frames
 626      (let ((height (cdr (assq 'height (frame-parameters (car frames))))))
 627        (modify-frame-parameters (car frames)
 628                                 (list (cons 'menu-bar-lines
 629                                           (if menu-bar-mode 1 0))))
 630        (modify-frame-parameters (car frames)
 631                                 (list (cons 'height height))))
 632      (setq frames (cdr frames)))))
 633
 634 (provide 'menu-bar)
 635
 636 ;;; menu-bar.el ends here