lisp/buff-menu.el

   1 ;;; buff-menu.el --- Interface for viewing and manipulating buffers
   2
   3 ;; Copyright (C) 1985-1987, 1993-1995, 2000-2012
   4 ;;   Free Software Foundation, Inc.
   5
   6 ;; Maintainer: FSF
   7 ;; Keywords: convenience
   8 ;; Package: emacs
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software: you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation, either version 3 of the License, or
  15 ;; (at your option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  24
  25 ;;; Commentary:
  26
  27 ;; The Buffer Menu is used to view, edit, delete, or change attributes
  28 ;; of buffers.  The entry points are C-x C-b (`list-buffers') and
  29 ;; M-x buffer-menu.
  30
  31 ;;; Code:
  32
  33 (require 'tabulated-list)
  34
  35 (defgroup Buffer-menu nil
  36   "Show a menu of all buffers in a buffer."
  37   :group 'tools
  38   :group 'convenience)
  39
  40 (defcustom Buffer-menu-use-header-line t
  41   "If non-nil, use the header line to display Buffer Menu column titles."
  42   :type 'boolean
  43   :group 'Buffer-menu)
  44
  45 (defface buffer-menu-buffer
  46   '((t (:weight bold)))
  47   "Face for buffer names in the Buffer Menu."
  48   :group 'Buffer-menu)
  49 (put 'Buffer-menu-buffer 'face-alias 'buffer-menu-buffer)
  50
  51 (defcustom Buffer-menu-buffer+size-width nil
  52   "Combined width of buffer name and size columns in Buffer Menu.
  53 If nil, use `Buffer-menu-name-width' and `Buffer-menu-size-width'.
  54
  55 If non-nil, the value of `Buffer-menu-name-width' is overridden;
  56 the name column is assigned width `Buffer-menu-buffer+size-width'
  57 minus `Buffer-menu-size-width'.  This use is deprecated."
  58   :type 'number
  59   :group 'Buffer-menu
  60   :version "24.2")
  61
  62 (make-obsolete-variable 'Buffer-menu-buffer+size-width
  63                         "`Buffer-menu-name-width' and `Buffer-menu-size-width'"
  64                         "24.2")
  65
  66 (defcustom Buffer-menu-name-width 19
  67   "Width of buffer size column in the Buffer Menu."
  68   :type 'number
  69   :group 'Buffer-menu
  70   :version "24.2")
  71
  72 (defcustom Buffer-menu-size-width 7
  73   "Width of buffer name column in the Buffer Menu."
  74   :type 'number
  75   :group 'Buffer-menu
  76   :version "24.2")
  77
  78 (defcustom Buffer-menu-mode-width 16
  79   "Width of mode name column in the Buffer Menu."
  80   :type 'number
  81   :group 'Buffer-menu)
  82
  83 (defcustom Buffer-menu-use-frame-buffer-list t
  84   "If non-nil, the Buffer Menu uses the selected frame's buffer list.
  85 Buffers that were never selected in that frame are listed at the end.
  86 If the value is nil, the Buffer Menu uses the global buffer list.
  87 This variable matters if the Buffer Menu is sorted by visited order,
  88 as it is by default."
  89   :type 'boolean
  90   :group 'Buffer-menu
  91   :version "22.1")
  92
  93 (defvar Buffer-menu-files-only nil
  94   "Non-nil if the current Buffer Menu lists only file buffers.
  95 This is set by the prefix argument to `buffer-menu' and related
  96 commands.")
  97 (make-variable-buffer-local 'Buffer-menu-files-only)
  98
  99 (defvar Info-current-file) ; from info.el
 100 (defvar Info-current-node) ; from info.el
 101
 102 (defvar Buffer-menu-mode-map
 103   (let ((map (make-sparse-keymap))
 104         (menu-map (make-sparse-keymap)))
 105     (set-keymap-parent map tabulated-list-mode-map)
 106     (define-key map "v" 'Buffer-menu-select)
 107     (define-key map "2" 'Buffer-menu-2-window)
 108     (define-key map "1" 'Buffer-menu-1-window)
 109     (define-key map "f" 'Buffer-menu-this-window)
 110     (define-key map "e" 'Buffer-menu-this-window)
 111     (define-key map "\C-m" 'Buffer-menu-this-window)
 112     (define-key map "o" 'Buffer-menu-other-window)
 113     (define-key map "\C-o" 'Buffer-menu-switch-other-window)
 114     (define-key map "s" 'Buffer-menu-save)
 115     (define-key map "d" 'Buffer-menu-delete)
 116     (define-key map "k" 'Buffer-menu-delete)
 117     (define-key map "\C-k" 'Buffer-menu-delete)
 118     (define-key map "\C-d" 'Buffer-menu-delete-backwards)
 119     (define-key map "x" 'Buffer-menu-execute)
 120     (define-key map " " 'next-line)
 121     (define-key map "\177" 'Buffer-menu-backup-unmark)
 122     (define-key map "~" 'Buffer-menu-not-modified)
 123     (define-key map "u" 'Buffer-menu-unmark)
 124     (define-key map "m" 'Buffer-menu-mark)
 125     (define-key map "t" 'Buffer-menu-visit-tags-table)
 126     (define-key map "%" 'Buffer-menu-toggle-read-only)
 127     (define-key map "b" 'Buffer-menu-bury)
 128     (define-key map "V" 'Buffer-menu-view)
 129     (define-key map "T" 'Buffer-menu-toggle-files-only)
 130     (define-key map (kbd "M-s a C-s")   'Buffer-menu-isearch-buffers)
 131     (define-key map (kbd "M-s a M-C-s") 'Buffer-menu-isearch-buffers-regexp)
 132
 133     (define-key map [mouse-2] 'Buffer-menu-mouse-select)
 134     (define-key map [follow-link] 'mouse-face)
 135
 136     (define-key map [menu-bar Buffer-menu-mode] (cons (purecopy "Buffer-Menu") menu-map))
 137     (define-key menu-map [quit]
 138       `(menu-item ,(purecopy "Quit") quit-window
 139                  :help ,(purecopy "Remove the buffer menu from the display")))
 140     (define-key menu-map [rev]
 141       `(menu-item ,(purecopy "Refresh") revert-buffer
 142                  :help ,(purecopy "Refresh the *Buffer List* buffer contents")))
 143     (define-key menu-map [s0] menu-bar-separator)
 144     (define-key menu-map [tf]
 145       `(menu-item ,(purecopy "Show Only File Buffers") Buffer-menu-toggle-files-only
 146                   :button (:toggle . Buffer-menu-files-only)
 147                   :help ,(purecopy "Toggle whether the current buffer-menu displays only file buffers")))
 148     (define-key menu-map [s1] menu-bar-separator)
 149     ;; FIXME: The "Select" entries could use better names...
 150     (define-key menu-map [sel]
 151       `(menu-item ,(purecopy "Select Marked") Buffer-menu-select
 152                  :help ,(purecopy "Select this line's buffer; also display buffers marked with `>'")))
 153     (define-key menu-map [bm2]
 154       `(menu-item ,(purecopy "Select Two") Buffer-menu-2-window
 155                  :help ,(purecopy "Select this line's buffer, with previous buffer in second window")))
 156     (define-key menu-map [bm1]
 157       `(menu-item ,(purecopy "Select Current") Buffer-menu-1-window
 158                  :help ,(purecopy "Select this line's buffer, alone, in full frame")))
 159     (define-key menu-map [ow]
 160       `(menu-item ,(purecopy "Select in Other Window") Buffer-menu-other-window
 161                  :help ,(purecopy "Select this line's buffer in other window, leaving buffer menu visible")))
 162     (define-key menu-map [tw]
 163       `(menu-item ,(purecopy "Select in Current Window") Buffer-menu-this-window
 164                  :help ,(purecopy "Select this line's buffer in this window")))
 165     (define-key menu-map [s2] menu-bar-separator)
 166     (define-key menu-map [is]
 167       `(menu-item ,(purecopy "Regexp Isearch Marked Buffers...") Buffer-menu-isearch-buffers-regexp
 168                  :help ,(purecopy "Search for a regexp through all marked buffers using Isearch")))
 169     (define-key menu-map [ir]
 170       `(menu-item ,(purecopy "Isearch Marked Buffers...") Buffer-menu-isearch-buffers
 171                  :help ,(purecopy "Search for a string through all marked buffers using Isearch")))
 172     (define-key menu-map [s3] menu-bar-separator)
 173     (define-key menu-map [by]
 174       `(menu-item ,(purecopy "Bury") Buffer-menu-bury
 175                  :help ,(purecopy "Bury the buffer listed on this line")))
 176     (define-key menu-map [vt]
 177       `(menu-item ,(purecopy "Set Unmodified") Buffer-menu-not-modified
 178                  :help ,(purecopy "Mark buffer on this line as unmodified (no changes to save)")))
 179     (define-key menu-map [ex]
 180       `(menu-item ,(purecopy "Execute") Buffer-menu-execute
 181                  :help ,(purecopy "Save and/or delete buffers marked with s or k commands")))
 182     (define-key menu-map [s4] menu-bar-separator)
 183     (define-key menu-map [delb]
 184       `(menu-item ,(purecopy "Mark for Delete and Move Backwards") Buffer-menu-delete-backwards
 185                  :help ,(purecopy "Mark buffer on this line to be deleted by x command and move up one line")))
 186     (define-key menu-map [del]
 187       `(menu-item ,(purecopy "Mark for Delete") Buffer-menu-delete
 188                  :help ,(purecopy "Mark buffer on this line to be deleted by x command")))
 189
 190     (define-key menu-map [sv]
 191       `(menu-item ,(purecopy "Mark for Save") Buffer-menu-save
 192                  :help ,(purecopy "Mark buffer on this line to be saved by x command")))
 193     (define-key menu-map [umk]
 194       `(menu-item ,(purecopy "Unmark") Buffer-menu-unmark
 195                  :help ,(purecopy "Cancel all requested operations on buffer on this line and move down")))
 196     (define-key menu-map [mk]
 197       `(menu-item ,(purecopy "Mark") Buffer-menu-mark
 198                  :help ,(purecopy "Mark buffer on this line for being displayed by v command")))
 199     map)
 200   "Local keymap for `Buffer-menu-mode' buffers.")
 201
 202 (define-obsolete-variable-alias 'buffer-menu-mode-hook
 203   'Buffer-menu-mode-hook "23.1")
 204
 205 (define-derived-mode Buffer-menu-mode tabulated-list-mode "Buffer Menu"
 206   "Major mode for Buffer Menu buffers.
 207 The Buffer Menu is invoked by the commands \\[list-buffers], \\[buffer-menu], and
 208 \\[buffer-menu-other-window].  See `buffer-menu' for details."
 209   (set (make-local-variable 'buffer-stale-function)
 210        (lambda (&optional _noconfirm) 'fast))
 211   (add-hook 'tabulated-list-revert-hook 'list-buffers--refresh nil t))
 212
 213 (defun buffer-menu (&optional arg)
 214   "Switch to the Buffer Menu.
 215 By default, all buffers are listed except those whose names start
 216 with a space (which are for internal use).  With prefix argument
 217 ARG, show only buffers that are visiting files.
 218
 219 The first column (denoted \"C\") shows \".\" for the buffer from
 220 which you came.  It shows \">\" for buffers you mark to be
 221 displayed, and \"D\" for those you mark for deletion.
 222
 223 The \"R\" column has a \"%\" if the buffer is read-only.
 224 The \"M\" column has a \"*\" if it is modified, or \"S\" if you
 225 have marked it for saving.
 226
 227 After this come the buffer name, its size in characters, its
 228 major mode, and the visited file name (if any).
 229
 230
 231 In the Buffer Menu, the following commands are defined:
 232 \\<Buffer-menu-mode-map>
 233 \\[quit-window]    Remove the Buffer Menu from the display.
 234 \\[Buffer-menu-this-window]  Select current line's buffer in place of the buffer menu.
 235 \\[Buffer-menu-other-window]    Select that buffer in another window,
 236      so the Buffer Menu remains visible in its window.
 237 \\[Buffer-menu-view]    Select current line's buffer, in View mode.
 238 \\[Buffer-menu-view-other-window]  Select that buffer in
 239      another window, in view-mode.
 240 \\[Buffer-menu-switch-other-window]  Make another window display that buffer.
 241 \\[Buffer-menu-mark]    Mark current line's buffer to be displayed.
 242 \\[Buffer-menu-select]    Select current line's buffer.
 243      Also show buffers marked with m, in other windows.
 244 \\[Buffer-menu-1-window]    Select that buffer in full-frame window.
 245 \\[Buffer-menu-2-window]    Select that buffer in one window, together with the
 246      buffer selected before this one in another window.
 247 \\[Buffer-menu-isearch-buffers]  Incremental search in the marked buffers.
 248 \\[Buffer-menu-isearch-buffers-regexp]  Isearch for regexp in the marked buffers.
 249 \\[Buffer-menu-visit-tags-table]    visit-tags-table this buffer.
 250 \\[Buffer-menu-not-modified]    Clear modified-flag on that buffer.
 251 \\[Buffer-menu-save]    Mark that buffer to be saved, and move down.
 252 \\[Buffer-menu-delete]  Mark that buffer to be deleted, and move down.
 253 \\[Buffer-menu-delete-backwards]  Mark that buffer to be deleted, and move up.
 254 \\[Buffer-menu-execute]    Delete or save marked buffers.
 255 \\[Buffer-menu-unmark]    Remove all marks from current line.
 256      With prefix argument, also move up one line.
 257 \\[Buffer-menu-backup-unmark]  Back up a line and remove marks.
 258 \\[Buffer-menu-toggle-read-only]    Toggle read-only status of buffer on this line.
 259 \\[revert-buffer]    Update the list of buffers.
 260 \\[Buffer-menu-toggle-files-only]    Toggle whether the menu displays only file buffers.
 261 \\[Buffer-menu-bury]    Bury the buffer listed on this line."
 262   (interactive "P")
 263   (switch-to-buffer (list-buffers-noselect arg))
 264   (message
 265    "Commands: d, s, x, u; f, o, 1, 2, m, v; ~, %%; q to quit; ? for help."))
 266
 267 (defun buffer-menu-other-window (&optional arg)
 268   "Display the Buffer Menu in another window.
 269 See `buffer-menu' for a description of the Buffer Menu.
 270
 271 By default, all buffers are listed except those whose names start
 272 with a space (which are for internal use).  With prefix argument
 273 ARG, show only buffers that are visiting files."
 274   (interactive "P")
 275   (switch-to-buffer-other-window (list-buffers-noselect arg))
 276   (message
 277    "Commands: d, s, x, u; f, o, 1, 2, m, v; ~, %%; q to quit; ? for help."))
 278
 279 ;;;###autoload
 280 (defun list-buffers (&optional arg)
 281   "Display a list of existing buffers.
 282 The list is displayed in a buffer named \"*Buffer List*\".
 283 See `buffer-menu' for details about the Buffer Menu buffer.
 284
 285 By default, all buffers are listed except those whose names start
 286 with a space (which are for internal use).  With prefix argument
 287 ARG, show only buffers that are visiting files."
 288   (interactive "P")
 289   (display-buffer (list-buffers-noselect arg)))
 290
 291 (defun Buffer-menu-toggle-files-only (arg)
 292   "Toggle whether the current buffer-menu displays only file buffers.
 293 With a positive ARG, display only file buffers.  With zero or
 294 negative ARG, display other buffers as well."
 295   (interactive "P")
 296   (setq Buffer-menu-files-only
 297         (cond ((not arg) (not Buffer-menu-files-only))
 298               ((> (prefix-numeric-value arg) 0) t)))
 299   (message (if Buffer-menu-files-only
 300                "Showing only file-visiting buffers."
 301              "Showing all non-internal buffers."))
 302   (revert-buffer))
 303
 304 (defalias 'Buffer-menu-sort 'tabulated-list-sort)
 305 \f
 306
 307 (defun Buffer-menu-buffer (&optional error-if-non-existent-p)
 308   "Return the buffer described by the current Buffer Menu line.
 309 If there is no buffer here, return nil if ERROR-IF-NON-EXISTENT-P
 310 is nil or omitted, and signal an error otherwise."
 311   (let ((buffer (tabulated-list-get-id)))
 312     (cond ((null buffer)
 313            (if error-if-non-existent-p
 314                (error "No buffer on this line")))
 315           ((not (buffer-live-p buffer))
 316            (if error-if-non-existent-p
 317                (error "This buffer has been killed")))
 318           (t buffer))))
 319
 320 (defun Buffer-menu-no-header ()
 321   (beginning-of-line)
 322   (if (or Buffer-menu-use-header-line
 323           (not (eq (char-after) ?C)))
 324       t
 325     (ding)
 326     (forward-line 1)
 327     nil))
 328
 329 (defun Buffer-menu-beginning ()
 330   (goto-char (point-min))
 331   (unless Buffer-menu-use-header-line
 332     (forward-line)))
 333
 334 \f
 335 ;;; Commands for modifying Buffer Menu entries.
 336
 337 (defun Buffer-menu-mark ()
 338   "Mark the Buffer menu entry at point for later display.
 339 It will be displayed by the \\<Buffer-menu-mode-map>\\[Buffer-menu-select] command."
 340   (interactive)
 341   (tabulated-list-set-col 0 ">" t)
 342   (forward-line))
 343
 344 (defun Buffer-menu-unmark (&optional backup)
 345   "Cancel all requested operations on buffer on this line and move down.
 346 Optional prefix arg means move up."
 347   (interactive "P")
 348   (tabulated-list-set-col 0 " " t)
 349   (forward-line (if backup -1 1)))
 350
 351 (defun Buffer-menu-backup-unmark ()
 352   "Move up and cancel all requested operations on buffer on line above."
 353   (interactive)
 354   (forward-line -1)
 355   (tabulated-list-set-col 0 " " t))
 356
 357 (defun Buffer-menu-delete (&optional arg)
 358   "Mark the buffer on this Buffer Menu buffer line for deletion.
 359 A subsequent \\<Buffer-menu-mode-map>`\\[Buffer-menu-execute]' command
 360 will delete it.
 361
 362 If prefix argument ARG is non-nil, it specifies the number of
 363 buffers to delete; a negative ARG means to delete backwards."
 364   (interactive "p")
 365   (if (or (null arg) (= arg 0))
 366       (setq arg 1))
 367   (while (> arg 0)
 368     (when (Buffer-menu-buffer)
 369       (tabulated-list-set-col 0 "D" t))
 370     (forward-line 1)
 371     (setq arg (1- arg)))
 372   (while (< arg 0)
 373     (when (Buffer-menu-buffer)
 374       (tabulated-list-set-col 0 "D" t))
 375     (forward-line -1)
 376     (setq arg (1+ arg))))
 377
 378 (defun Buffer-menu-delete-backwards (&optional arg)
 379   "Mark the buffer on this Buffer Menu line for deletion, and move up.
 380 Prefix ARG means move that many lines."
 381   (interactive "p")
 382   (Buffer-menu-delete (- (or arg 1))))
 383
 384 (defun Buffer-menu-save ()
 385   "Mark the buffer on this Buffer Menu line for saving.
 386 A subsequent \\<Buffer-menu-mode-map>`\\[Buffer-menu-execute]' command
 387 will save it."
 388   (interactive)
 389   (when (Buffer-menu-buffer)
 390     (tabulated-list-set-col 2 "S" t)
 391     (forward-line 1)))
 392
 393 (defun Buffer-menu-not-modified (&optional arg)
 394   "Mark the buffer on this line as unmodified (no changes to save).
 395 If ARG is non-nil (interactively, with a prefix argument), mark
 396 it as modified."
 397   (interactive "P")
 398   (with-current-buffer (Buffer-menu-buffer t)
 399     (set-buffer-modified-p arg))
 400   (tabulated-list-set-col 2 (if arg "*" " ") t))
 401
 402 (defun Buffer-menu-execute ()
 403   "Save and/or delete marked buffers in the Buffer Menu.
 404 Buffers marked with \\<Buffer-menu-mode-map>`\\[Buffer-menu-save]' are saved.
 405 Buffers marked with \\<Buffer-menu-mode-map>`\\[Buffer-menu-delete]' are deleted."
 406   (interactive)
 407   (save-excursion
 408     (Buffer-menu-beginning)
 409     (while (not (eobp))
 410       (let ((buffer (tabulated-list-get-id))
 411             (entry  (tabulated-list-get-entry)))
 412         (cond ((null entry)
 413                (forward-line 1))
 414               ((not (buffer-live-p buffer))
 415                (tabulated-list-delete-entry))
 416               (t
 417                (let ((delete (eq (char-after) ?D)))
 418                  (when (equal (aref entry 2) "S")
 419                    (condition-case nil
 420                        (progn
 421                          (with-current-buffer buffer
 422                            (save-buffer))
 423                          (tabulated-list-set-col 2 " " t))
 424                      (error (warn "Error saving %s" buffer))))
 425                  (if delete
 426                      (unless (eq buffer (current-buffer))
 427                        (kill-buffer buffer)
 428                        (tabulated-list-delete-entry))
 429                    (forward-line 1)))))))))
 430
 431 (defun Buffer-menu-select ()
 432   "Select this line's buffer; also, display buffers marked with `>'.
 433 You can mark buffers with the \\<Buffer-menu-mode-map>`\\[Buffer-menu-mark]' command.
 434 This command deletes and replaces all the previously existing windows
 435 in the selected frame."
 436   (interactive)
 437   (let* ((this-buffer (Buffer-menu-buffer t))
 438          (menu-buffer (current-buffer))
 439          (others (delq this-buffer (Buffer-menu-marked-buffers t)))
 440          (height (/ (1- (frame-height)) (1+ (length others)))))
 441     (delete-other-windows)
 442     (switch-to-buffer this-buffer)
 443     (unless (eq menu-buffer this-buffer)
 444       (bury-buffer menu-buffer))
 445     (dolist (buffer others)
 446       (split-window nil height)
 447       (other-window 1)
 448       (switch-to-buffer buffer))
 449     ;; Back to the beginning!
 450     (other-window 1)))
 451
 452 (defun Buffer-menu-marked-buffers (&optional unmark)
 453   "Return the list of buffers marked with `Buffer-menu-mark'.
 454 If UNMARK is non-nil, unmark them."
 455   (let (buffers)
 456     (Buffer-menu-beginning)
 457     (while (re-search-forward "^>" nil t)
 458       (let ((buffer (Buffer-menu-buffer)))
 459         (if (and buffer unmark)
 460             (tabulated-list-set-col 0 " " t))
 461         (if (buffer-live-p buffer)
 462             (push buffer buffers))))
 463     (nreverse buffers)))
 464
 465 (defun Buffer-menu-isearch-buffers ()
 466   "Search for a string through all marked buffers using Isearch."
 467   (interactive)
 468   (multi-isearch-buffers (Buffer-menu-marked-buffers)))
 469
 470 (defun Buffer-menu-isearch-buffers-regexp ()
 471   "Search for a regexp through all marked buffers using Isearch."
 472   (interactive)
 473   (multi-isearch-buffers-regexp (Buffer-menu-marked-buffers)))
 474
 475 \f
 476 (defun Buffer-menu-visit-tags-table ()
 477   "Visit the tags table in the buffer on this line.  See `visit-tags-table'."
 478   (interactive)
 479   (let ((file (buffer-file-name (Buffer-menu-buffer t))))
 480     (if file
 481         (visit-tags-table file)
 482       (error "Specified buffer has no file"))))
 483
 484 (defun Buffer-menu-1-window ()
 485   "Select this line's buffer, alone, in full frame."
 486   (interactive)
 487   (switch-to-buffer (Buffer-menu-buffer t))
 488   (bury-buffer (other-buffer))
 489   (delete-other-windows))
 490
 491 (defun Buffer-menu-this-window ()
 492   "Select this line's buffer in this window."
 493   (interactive)
 494   (switch-to-buffer (Buffer-menu-buffer t)))
 495
 496 (defun Buffer-menu-other-window ()
 497   "Select this line's buffer in other window, leaving buffer menu visible."
 498   (interactive)
 499   (switch-to-buffer-other-window (Buffer-menu-buffer t)))
 500
 501 (defun Buffer-menu-switch-other-window ()
 502   "Make the other window select this line's buffer.
 503 The current window remains selected."
 504   (interactive)
 505   (display-buffer (Buffer-menu-buffer t) t))
 506
 507 (defun Buffer-menu-2-window ()
 508   "Select this line's buffer, with previous buffer in second window."
 509   (interactive)
 510   (let ((buff (Buffer-menu-buffer t))
 511         (menu (current-buffer)))
 512     (delete-other-windows)
 513     (switch-to-buffer (other-buffer))
 514     (switch-to-buffer-other-window buff)
 515     (bury-buffer menu)))
 516
 517 (defun Buffer-menu-toggle-read-only ()
 518   "Toggle read-only status of buffer on this line."
 519   (interactive)
 520   (let (read-only)
 521     (with-current-buffer (Buffer-menu-buffer t)
 522       (with-no-warnings (toggle-read-only))
 523       (setq read-only buffer-read-only))
 524     (tabulated-list-set-col 1 (if read-only "%" " ") t)))
 525
 526 (defun Buffer-menu-bury ()
 527   "Bury the buffer listed on this line."
 528   (interactive)
 529   (let ((buffer (tabulated-list-get-id)))
 530     (cond ((null buffer))
 531           ((buffer-live-p buffer)
 532            (bury-buffer buffer)
 533            (save-excursion
 534              (let ((elt (tabulated-list-delete-entry)))
 535                (goto-char (point-max))
 536                (apply 'tabulated-list-print-entry elt)))
 537            (message "Buffer buried."))
 538           (t
 539            (tabulated-list-delete-entry)
 540            (message "Buffer is dead; removing from list.")))))
 541
 542 (defun Buffer-menu-view ()
 543   "View this line's buffer in View mode."
 544   (interactive)
 545   (view-buffer (Buffer-menu-buffer t)))
 546
 547 (defun Buffer-menu-view-other-window ()
 548   "View this line's buffer in View mode in another window."
 549   (interactive)
 550   (view-buffer-other-window (Buffer-menu-buffer t)))
 551 \f
 552 ;;; Functions for populating the Buffer Menu.
 553
 554 ;;;###autoload
 555 (defun list-buffers-noselect (&optional files-only buffer-list)
 556   "Create and return a Buffer Menu buffer.
 557 This is called by `buffer-menu' and others as a subroutine.
 558
 559 If FILES-ONLY is non-nil, show only file-visiting buffers.
 560 If BUFFER-LIST is non-nil, it should be a list of buffers; it
 561 means list those buffers and no others."
 562   (let ((old-buffer (current-buffer))
 563         (buffer (get-buffer-create "*Buffer List*")))
 564     (with-current-buffer buffer
 565       (Buffer-menu-mode)
 566       (setq Buffer-menu-files-only (and files-only (>= files-only 0)))
 567       (list-buffers--refresh buffer-list old-buffer)
 568       (tabulated-list-print))
 569     buffer))
 570
 571 (defun Buffer-menu-mouse-select (event)
 572   "Select the buffer whose line you click on."
 573   (interactive "e")
 574   (select-window (posn-window (event-end event)))
 575   (let ((buffer (tabulated-list-get-id (posn-point (event-end event)))))
 576     (when (buffer-live-p buffer)
 577       (if (and (window-dedicated-p (selected-window))
 578                (eq (selected-window) (frame-root-window)))
 579           (switch-to-buffer-other-frame buffer)
 580         (switch-to-buffer buffer)))))
 581
 582 (defun list-buffers--refresh (&optional buffer-list old-buffer)
 583   ;; Set up `tabulated-list-format'.
 584   (let ((name-width Buffer-menu-name-width)
 585         (size-width Buffer-menu-size-width))
 586     ;; Handle obsolete variable:
 587     (if Buffer-menu-buffer+size-width
 588         (setq name-width (- Buffer-menu-buffer+size-width size-width)))
 589     (setq tabulated-list-format
 590           (vector '("C" 1 t :pad-right 0)
 591                   '("R" 1 t :pad-right 0)
 592                   '("M" 1 t)
 593                   `("Buffer" ,name-width t)
 594                   `("Size" ,size-width tabulated-list-entry-size->
 595                            :right-align t)
 596                   `("Mode" ,Buffer-menu-mode-width t)
 597                   '("File" 1 t))))
 598   (setq tabulated-list-use-header-line Buffer-menu-use-header-line)
 599   ;; Collect info for each buffer we're interested in.
 600   (let ((buffer-menu-buffer (current-buffer))
 601         (show-non-file (not Buffer-menu-files-only))
 602         entries)
 603     (dolist (buffer (or buffer-list
 604                         (buffer-list (if Buffer-menu-use-frame-buffer-list
 605                                          (selected-frame)))))
 606       (with-current-buffer buffer
 607         (let* ((name (buffer-name))
 608                (file buffer-file-name))
 609           (when (and (buffer-live-p buffer)
 610                      (or buffer-list
 611                          (and (not (string= (substring name 0 1) " "))
 612                               (not (eq buffer buffer-menu-buffer))
 613                               (or file show-non-file))))
 614             (push (list buffer
 615                         (vector (if (eq buffer old-buffer) "." " ")
 616                                 (if buffer-read-only "%" " ")
 617                                 (if (buffer-modified-p) "*" " ")
 618                                 (Buffer-menu--pretty-name name)
 619                                 (number-to-string (buffer-size))
 620                                 (concat (format-mode-line mode-name nil nil buffer)
 621                                         (if mode-line-process
 622                                             (format-mode-line mode-line-process
 623                                                               nil nil buffer)))
 624                                 (Buffer-menu--pretty-file-name file)))
 625                   entries)))))
 626     (setq tabulated-list-entries (nreverse entries)))
 627   (tabulated-list-init-header))
 628
 629 (defun tabulated-list-entry-size-> (entry1 entry2)
 630   (> (string-to-number (aref (cadr entry1) 4))
 631      (string-to-number (aref (cadr entry2) 4))))
 632
 633 (defun Buffer-menu--pretty-name (name)
 634   (propertize name
 635               'font-lock-face 'buffer-menu-buffer
 636               'mouse-face 'highlight))
 637
 638 (defun Buffer-menu--pretty-file-name (file)
 639   (cond (file
 640          (abbreviate-file-name file))
 641         ((and (boundp 'list-buffers-directory)
 642               list-buffers-directory)
 643          list-buffers-directory)
 644         ((eq major-mode 'Info-mode)
 645          (Buffer-menu-info-node-description Info-current-file))
 646         (t "")))
 647
 648 (defun Buffer-menu-info-node-description (file)
 649   (cond
 650    ((equal file "dir") "*Info Directory*")
 651    ((eq file 'apropos) "*Info Apropos*")
 652    ((eq file 'history) "*Info History*")
 653    ((eq file 'toc)     "*Info TOC*")
 654    ((not (stringp file)) "") ; Avoid errors
 655    (t
 656     (concat "(" (file-name-nondirectory file) ") " Info-current-node))))
 657
 658 ;;; buff-menu.el ends here