lisp/buff-menu.el

   1 ;;; buff-menu.el --- buffer menu main function and support functions -*- coding:utf-8 -*-
   2
   3 ;; Copyright (C) 1985, 1986, 1987, 1993, 1994, 1995, 2000, 2001, 2002, 2003,
   4 ;;   2004, 2005 Free Software Foundation, Inc.
   5
   6 ;; Maintainer: FSF
   7 ;; Keywords: convenience
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 2, or (at your option)
  14 ;; any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  23 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  24 ;; Boston, MA 02110-1301, USA.
  25
  26 ;;; Commentary:
  27
  28 ;; Edit, delete, or change attributes of all currently active Emacs
  29 ;; buffers from a list summarizing their state.  A good way to browse
  30 ;; any special or scratch buffers you have loaded, since you can't find
  31 ;; them by filename.  The single entry point is `list-buffers',
  32 ;; normally bound to C-x C-b.
  33
  34 ;;; Change Log:
  35
  36 ;; Buffer-menu-view: New function
  37 ;; Buffer-menu-view-other-window: New function
  38
  39 ;; Merged by esr with recent mods to Emacs 19 buff-menu, 23 Mar 1993
  40 ;;
  41 ;; Modified by Bob Weiner, Motorola, Inc., 4/14/89
  42 ;;
  43 ;; Added optional backup argument to 'Buffer-menu-unmark' to make it undelete
  44 ;; current entry and then move to previous one.
  45 ;;
  46 ;; Based on FSF code dating back to 1985.
  47
  48 ;;; Code:
  49
  50 ;;Trying to preserve the old window configuration works well in
  51 ;;simple scenarios, when you enter the buffer menu, use it, and exit it.
  52 ;;But it does strange things when you switch back to the buffer list buffer
  53 ;;with C-x b, later on, when the window configuration is different.
  54 ;;The choice seems to be, either restore the window configuration
  55 ;;in all cases, or in no cases.
  56 ;;I decided it was better not to restore the window config at all. -- rms.
  57
  58 ;;But since then, I changed buffer-menu to use the selected window,
  59 ;;so q now once again goes back to the previous window configuration.
  60
  61 ;;(defvar Buffer-menu-window-config nil
  62 ;;  "Window configuration saved from entry to `buffer-menu'.")
  63
  64 ;; Put buffer *Buffer List* into proper mode right away
  65 ;; so that from now on even list-buffers is enough to get a buffer menu.
  66
  67 (defgroup Buffer-menu nil
  68   "Show a menu of all buffers in a buffer."
  69   :group 'tools
  70   :group 'convenience)
  71
  72 (defcustom Buffer-menu-use-header-line t
  73   "*Non-nil means to use an immovable header-line."
  74   :type 'boolean
  75   :group 'Buffer-menu)
  76
  77 (defface buffer-menu-buffer
  78   '((t (:weight bold)))
  79   "Face used to highlight buffer names in the buffer menu."
  80   :group 'Buffer-menu)
  81 (put 'Buffer-menu-buffer 'face-alias 'buffer-menu-buffer)
  82
  83 (defcustom Buffer-menu-buffer+size-width 26
  84   "*How wide to jointly make the buffer name and size columns."
  85   :type 'number
  86   :group 'Buffer-menu)
  87
  88 (defcustom Buffer-menu-mode-width 16
  89   "*How wide to make the mode name column."
  90   :type 'number
  91   :group 'Buffer-menu)
  92
  93 (defcustom Buffer-menu-use-frame-buffer-list t
  94   "If non-nil, the Buffer Menu uses the selected frame's buffer list.
  95 Buffers that were never selected in that frame are listed at the end.
  96 If the value is nil, the Buffer Menu uses the global buffer list.
  97 This variable matters if the Buffer Menu is sorted by visited order,
  98 as it is by default."
  99   :type 'boolean
 100   :group 'Buffer-menu
 101   :version "22.1")
 102
 103 ;; This should get updated & resorted when you click on a column heading
 104 (defvar Buffer-menu-sort-column nil
 105   "2 for sorting by buffer names.  5 for sorting by file names.
 106 nil for default sorting by visited order.")
 107
 108 (defconst Buffer-menu-buffer-column 4)
 109
 110 (defvar Buffer-menu-mode-map nil
 111   "Local keymap for `Buffer-menu-mode' buffers.")
 112
 113 (defvar Buffer-menu-files-only nil
 114   "Non-nil if the current buffer-menu lists only file buffers.
 115 This variable determines whether reverting the buffer lists only
 116 file buffers.  It affects both manual reverting and reverting by
 117 Auto Revert Mode.")
 118
 119 (make-variable-buffer-local 'Buffer-menu-files-only)
 120
 121 (if Buffer-menu-mode-map
 122     ()
 123   (setq Buffer-menu-mode-map (make-keymap))
 124   (suppress-keymap Buffer-menu-mode-map t)
 125   (define-key Buffer-menu-mode-map "q" 'quit-window)
 126   (define-key Buffer-menu-mode-map "v" 'Buffer-menu-select)
 127   (define-key Buffer-menu-mode-map "2" 'Buffer-menu-2-window)
 128   (define-key Buffer-menu-mode-map "1" 'Buffer-menu-1-window)
 129   (define-key Buffer-menu-mode-map "f" 'Buffer-menu-this-window)
 130   (define-key Buffer-menu-mode-map "e" 'Buffer-menu-this-window)
 131   (define-key Buffer-menu-mode-map "\C-m" 'Buffer-menu-this-window)
 132   (define-key Buffer-menu-mode-map "o" 'Buffer-menu-other-window)
 133   (define-key Buffer-menu-mode-map "\C-o" 'Buffer-menu-switch-other-window)
 134   (define-key Buffer-menu-mode-map "s" 'Buffer-menu-save)
 135   (define-key Buffer-menu-mode-map "d" 'Buffer-menu-delete)
 136   (define-key Buffer-menu-mode-map "k" 'Buffer-menu-delete)
 137   (define-key Buffer-menu-mode-map "\C-d" 'Buffer-menu-delete-backwards)
 138   (define-key Buffer-menu-mode-map "\C-k" 'Buffer-menu-delete)
 139   (define-key Buffer-menu-mode-map "x" 'Buffer-menu-execute)
 140   (define-key Buffer-menu-mode-map " " 'next-line)
 141   (define-key Buffer-menu-mode-map "n" 'next-line)
 142   (define-key Buffer-menu-mode-map "p" 'previous-line)
 143   (define-key Buffer-menu-mode-map "\177" 'Buffer-menu-backup-unmark)
 144   (define-key Buffer-menu-mode-map "~" 'Buffer-menu-not-modified)
 145   (define-key Buffer-menu-mode-map "?" 'describe-mode)
 146   (define-key Buffer-menu-mode-map "u" 'Buffer-menu-unmark)
 147   (define-key Buffer-menu-mode-map "m" 'Buffer-menu-mark)
 148   (define-key Buffer-menu-mode-map "t" 'Buffer-menu-visit-tags-table)
 149   (define-key Buffer-menu-mode-map "%" 'Buffer-menu-toggle-read-only)
 150   (define-key Buffer-menu-mode-map "b" 'Buffer-menu-bury)
 151   (define-key Buffer-menu-mode-map "g" 'Buffer-menu-revert)
 152   (define-key Buffer-menu-mode-map "V" 'Buffer-menu-view)
 153   (define-key Buffer-menu-mode-map "T" 'Buffer-menu-toggle-files-only)
 154   (define-key Buffer-menu-mode-map [mouse-2] 'Buffer-menu-mouse-select)
 155   (define-key Buffer-menu-mode-map [follow-link] 'mouse-face)
 156 )
 157
 158 ;; Buffer Menu mode is suitable only for specially formatted data.
 159 (put 'Buffer-menu-mode 'mode-class 'special)
 160
 161 (defun Buffer-menu-mode ()
 162   "Major mode for editing a list of buffers.
 163 Each line describes one of the buffers in Emacs.
 164 Letters do not insert themselves; instead, they are commands.
 165 \\<Buffer-menu-mode-map>
 166 \\[Buffer-menu-mouse-select] -- select buffer you click on, in place of the buffer menu.
 167 \\[Buffer-menu-this-window] -- select current line's buffer in place of the buffer menu.
 168 \\[Buffer-menu-other-window] -- select that buffer in another window,
 169   so the buffer menu buffer remains visible in its window.
 170 \\[Buffer-menu-view] -- select current line's buffer, but in view-mode.
 171 \\[Buffer-menu-view-other-window] -- select that buffer in
 172   another window, in view-mode.
 173 \\[Buffer-menu-switch-other-window] -- make another window display that buffer.
 174 \\[Buffer-menu-mark] -- mark current line's buffer to be displayed.
 175 \\[Buffer-menu-select] -- select current line's buffer.
 176   Also show buffers marked with m, in other windows.
 177 \\[Buffer-menu-1-window] -- select that buffer in full-frame window.
 178 \\[Buffer-menu-2-window] -- select that buffer in one window,
 179   together with buffer selected before this one in another window.
 180 \\[Buffer-menu-visit-tags-table] -- visit-tags-table this buffer.
 181 \\[Buffer-menu-not-modified] -- clear modified-flag on that buffer.
 182 \\[Buffer-menu-save] -- mark that buffer to be saved, and move down.
 183 \\[Buffer-menu-delete] -- mark that buffer to be deleted, and move down.
 184 \\[Buffer-menu-delete-backwards] -- mark that buffer to be deleted, and move up.
 185 \\[Buffer-menu-execute] -- delete or save marked buffers.
 186 \\[Buffer-menu-unmark] -- remove all kinds of marks from current line.
 187   With prefix argument, also move up one line.
 188 \\[Buffer-menu-backup-unmark] -- back up a line and remove marks.
 189 \\[Buffer-menu-toggle-read-only] -- toggle read-only status of buffer on this line.
 190 \\[Buffer-menu-revert] -- update the list of buffers.
 191 \\[Buffer-menu-toggle-files-only] -- toggle whether the menu displays only file buffers.
 192 \\[Buffer-menu-bury] -- bury the buffer listed on this line."
 193   (kill-all-local-variables)
 194   (use-local-map Buffer-menu-mode-map)
 195   (setq major-mode 'Buffer-menu-mode)
 196   (setq mode-name "Buffer Menu")
 197   (set (make-local-variable 'revert-buffer-function)
 198        'Buffer-menu-revert-function)
 199   (set (make-local-variable 'buffer-stale-function)
 200        #'(lambda (&optional noconfirm) 'fast))
 201   (setq truncate-lines t)
 202   (setq buffer-read-only t)
 203   (run-mode-hooks 'buffer-menu-mode-hook))
 204
 205 ;; This function exists so we can make the doc string of Buffer-menu-mode
 206 ;; look nice.
 207 (defun Buffer-menu-revert ()
 208   "Update the list of buffers."
 209   (interactive)
 210   (revert-buffer))
 211
 212 (defun Buffer-menu-revert-function (ignore1 ignore2)
 213   (or (eq buffer-undo-list t)
 214       (setq buffer-undo-list nil))
 215   ;; We can not use save-excursion here.  The buffer gets erased.
 216   (let ((opoint (point))
 217         (eobp (eobp))
 218         (ocol (current-column))
 219         (oline (progn (move-to-column 4)
 220                       (get-text-property (point) 'buffer)))
 221         (prop (point-min))
 222         ;; do not make undo records for the reversion.
 223         (buffer-undo-list t))
 224     ;; We can be called by Auto Revert Mode with the "*Buffer Menu*"
 225     ;; temporarily the current buffer.  Make sure that the
 226     ;; interactively current buffer is correctly identified with a `.'
 227     ;; by `list-buffers-noselect'.
 228     (with-current-buffer (window-buffer)
 229       (list-buffers-noselect Buffer-menu-files-only))
 230     (if oline
 231         (while (setq prop (next-single-property-change prop 'buffer))
 232           (when (eq (get-text-property prop 'buffer) oline)
 233             (goto-char prop)
 234             (move-to-column ocol)))
 235       (goto-char (if eobp (point-max) opoint)))))
 236
 237 (defun Buffer-menu-toggle-files-only (arg)
 238   "Toggle whether the current buffer-menu displays only file buffers.
 239 With a positive ARG display only file buffers.  With zero or
 240 negative ARG, display other buffers as well."
 241   (interactive "P")
 242   (setq Buffer-menu-files-only
 243         (cond ((not arg) (not Buffer-menu-files-only))
 244               ((> (prefix-numeric-value arg) 0) t)))
 245   (revert-buffer))
 246
 247 \f
 248 (defun Buffer-menu-buffer (error-if-non-existent-p)
 249   "Return buffer described by this line of buffer menu."
 250   (let* ((where (save-excursion
 251                   (beginning-of-line)
 252                   (+ (point) Buffer-menu-buffer-column)))
 253          (name (and (not (eobp)) (get-text-property where 'buffer-name)))
 254          (buf (and (not (eobp)) (get-text-property where 'buffer))))
 255     (if name
 256         (or (get-buffer name)
 257             (and buf (buffer-name buf) buf)
 258             (if error-if-non-existent-p
 259                 (error "No buffer named `%s'" name)
 260               nil))
 261       (or (and buf (buffer-name buf) buf)
 262           (if error-if-non-existent-p
 263               (error "No buffer on this line")
 264             nil)))))
 265 \f
 266 (defun buffer-menu (&optional arg)
 267   "Make a menu of buffers so you can save, delete or select them.
 268 With argument, show only buffers that are visiting files.
 269 Type ? after invocation to get help on commands available.
 270 Type q to remove the buffer menu from the display.
 271
 272 The first column shows `>' for a buffer you have
 273 marked to be displayed, `D' for one you have marked for
 274 deletion, and `.' for the current buffer.
 275
 276 The C column has a `.' for the buffer from which you came.
 277 The R column has a `%' if the buffer is read-only.
 278 The M column has a `*' if it is modified,
 279 or `S' if you have marked it for saving.
 280 After this come the buffer name, its size in characters,
 281 its major mode, and the visited file name (if any)."
 282   (interactive "P")
 283 ;;;  (setq Buffer-menu-window-config (current-window-configuration))
 284   (switch-to-buffer (list-buffers-noselect arg))
 285   (message
 286    "Commands: d, s, x, u; f, o, 1, 2, m, v; ~, %%; q to quit; ? for help."))
 287
 288 (defun buffer-menu-other-window (&optional arg)
 289   "Display a list of buffers in another window.
 290 With the buffer list buffer, you can save, delete or select the buffers.
 291 With argument, show only buffers that are visiting files.
 292 Type ? after invocation to get help on commands available.
 293 Type q to remove the buffer menu from the display.
 294 For more information, see the function `buffer-menu'."
 295   (interactive "P")
 296 ;;;  (setq Buffer-menu-window-config (current-window-configuration))
 297   (switch-to-buffer-other-window (list-buffers-noselect arg))
 298   (message
 299    "Commands: d, s, x, u; f, o, 1, 2, m, v; ~, %%; q to quit; ? for help."))
 300
 301 (defun Buffer-menu-no-header ()
 302   (beginning-of-line)
 303   (if (or Buffer-menu-use-header-line
 304           (not (eq (char-after) ?C)))
 305       t
 306     (ding)
 307     (forward-line 1)
 308     nil))
 309
 310 (defun Buffer-menu-mark ()
 311   "Mark buffer on this line for being displayed by \\<Buffer-menu-mode-map>\\[Buffer-menu-select] command."
 312   (interactive)
 313   (when (Buffer-menu-no-header)
 314     (let ((buffer-read-only nil))
 315       (delete-char 1)
 316       (insert ?>)
 317       (forward-line 1))))
 318
 319 (defun Buffer-menu-unmark (&optional backup)
 320   "Cancel all requested operations on buffer on this line and move down.
 321 Optional prefix arg means move up."
 322   (interactive "P")
 323   (when (Buffer-menu-no-header)
 324     (let* ((buf (Buffer-menu-buffer t))
 325            (mod (buffer-modified-p buf))
 326            (readonly (save-excursion (set-buffer buf) buffer-read-only))
 327            (buffer-read-only nil))
 328       (delete-char 3)
 329       (insert (if readonly (if mod " %*" " % ") (if mod "  *" "   ")))))
 330   (forward-line (if backup -1 1)))
 331
 332 (defun Buffer-menu-backup-unmark ()
 333   "Move up and cancel all requested operations on buffer on line above."
 334   (interactive)
 335   (forward-line -1)
 336   (Buffer-menu-unmark)
 337   (forward-line -1))
 338
 339 (defun Buffer-menu-delete (&optional arg)
 340   "Mark buffer on this line to be deleted by \\<Buffer-menu-mode-map>\\[Buffer-menu-execute] command.
 341 Prefix arg is how many buffers to delete.
 342 Negative arg means delete backwards."
 343   (interactive "p")
 344   (when (Buffer-menu-no-header)
 345     (let ((buffer-read-only nil))
 346       (if (or (null arg) (= arg 0))
 347           (setq arg 1))
 348       (while (> arg 0)
 349         (delete-char 1)
 350         (insert ?D)
 351         (forward-line 1)
 352         (setq arg (1- arg)))
 353       (while (and (< arg 0)
 354                   (Buffer-menu-no-header))
 355         (delete-char 1)
 356         (insert ?D)
 357         (forward-line -1)
 358         (setq arg (1+ arg))))))
 359
 360 (defun Buffer-menu-delete-backwards (&optional arg)
 361   "Mark buffer on this line to be deleted by \\<Buffer-menu-mode-map>\\[Buffer-menu-execute] command
 362 and then move up one line.  Prefix arg means move that many lines."
 363   (interactive "p")
 364   (Buffer-menu-delete (- (or arg 1))))
 365
 366 (defun Buffer-menu-save ()
 367   "Mark buffer on this line to be saved by \\<Buffer-menu-mode-map>\\[Buffer-menu-execute] command."
 368   (interactive)
 369   (when (Buffer-menu-no-header)
 370     (let ((buffer-read-only nil))
 371       (forward-char 2)
 372       (delete-char 1)
 373       (insert ?S)
 374       (forward-line 1))))
 375
 376 (defun Buffer-menu-not-modified (&optional arg)
 377   "Mark buffer on this line as unmodified (no changes to save)."
 378   (interactive "P")
 379   (save-excursion
 380     (set-buffer (Buffer-menu-buffer t))
 381     (set-buffer-modified-p arg))
 382   (save-excursion
 383    (beginning-of-line)
 384    (forward-char 2)
 385    (if (= (char-after) (if arg ?\s ?*))
 386        (let ((buffer-read-only nil))
 387          (delete-char 1)
 388          (insert (if arg ?* ?\s))))))
 389
 390 (defun Buffer-menu-beginning ()
 391   (goto-char (point-min))
 392   (unless Buffer-menu-use-header-line
 393     (forward-line)))
 394
 395 (defun Buffer-menu-execute ()
 396   "Save and/or delete buffers marked with \\<Buffer-menu-mode-map>\\[Buffer-menu-save] or \\<Buffer-menu-mode-map>\\[Buffer-menu-delete] commands."
 397   (interactive)
 398   (save-excursion
 399     (Buffer-menu-beginning)
 400     (while (re-search-forward "^..S" nil t)
 401       (let ((modp nil))
 402         (save-excursion
 403           (set-buffer (Buffer-menu-buffer t))
 404           (save-buffer)
 405           (setq modp (buffer-modified-p)))
 406         (let ((buffer-read-only nil))
 407           (delete-char -1)
 408           (insert (if modp ?* ?\s))))))
 409   (save-excursion
 410     (Buffer-menu-beginning)
 411     (let ((buff-menu-buffer (current-buffer))
 412           (buffer-read-only nil))
 413       (while (re-search-forward "^D" nil t)
 414         (forward-char -1)
 415         (let ((buf (Buffer-menu-buffer nil)))
 416           (or (eq buf nil)
 417               (eq buf buff-menu-buffer)
 418               (save-excursion (kill-buffer buf)))
 419           (if (and buf (buffer-name buf))
 420             (progn (delete-char 1)
 421                    (insert ?\s))
 422           (delete-region (point) (progn (forward-line 1) (point)))
 423             (unless (bobp)
 424               (forward-char -1))))))))
 425
 426 (defun Buffer-menu-select ()
 427   "Select this line's buffer; also display buffers marked with `>'.
 428 You can mark buffers with the \\<Buffer-menu-mode-map>\\[Buffer-menu-mark] command.
 429 This command deletes and replaces all the previously existing windows
 430 in the selected frame."
 431   (interactive)
 432   (let ((buff (Buffer-menu-buffer t))
 433         (menu (current-buffer))
 434         (others ())
 435         tem)
 436     (Buffer-menu-beginning)
 437     (while (re-search-forward "^>" nil t)
 438       (setq tem (Buffer-menu-buffer t))
 439       (let ((buffer-read-only nil))
 440         (delete-char -1)
 441         (insert ?\s))
 442       (or (eq tem buff) (memq tem others) (setq others (cons tem others))))
 443     (setq others (nreverse others)
 444           tem (/ (1- (frame-height)) (1+ (length others))))
 445     (delete-other-windows)
 446     (switch-to-buffer buff)
 447     (or (eq menu buff)
 448         (bury-buffer menu))
 449     (if (equal (length others) 0)
 450         (progn
 451 ;;;       ;; Restore previous window configuration before displaying
 452 ;;;       ;; selected buffers.
 453 ;;;       (if Buffer-menu-window-config
 454 ;;;           (progn
 455 ;;;             (set-window-configuration Buffer-menu-window-config)
 456 ;;;             (setq Buffer-menu-window-config nil)))
 457           (switch-to-buffer buff))
 458       (while others
 459         (split-window nil tem)
 460         (other-window 1)
 461         (switch-to-buffer (car others))
 462         (setq others (cdr others)))
 463       (other-window 1)                          ;back to the beginning!
 464 )))
 465
 466
 467 \f
 468 (defun Buffer-menu-visit-tags-table ()
 469   "Visit the tags table in the buffer on this line.  See `visit-tags-table'."
 470   (interactive)
 471   (let ((file (buffer-file-name (Buffer-menu-buffer t))))
 472     (if file
 473         (visit-tags-table file)
 474       (error "Specified buffer has no file"))))
 475
 476 (defun Buffer-menu-1-window ()
 477   "Select this line's buffer, alone, in full frame."
 478   (interactive)
 479   (switch-to-buffer (Buffer-menu-buffer t))
 480   (bury-buffer (other-buffer))
 481   (delete-other-windows))
 482
 483 (defun Buffer-menu-mouse-select (event)
 484   "Select the buffer whose line you click on."
 485   (interactive "e")
 486   (let (buffer)
 487     (save-excursion
 488       (set-buffer (window-buffer (posn-window (event-end event))))
 489       (save-excursion
 490         (goto-char (posn-point (event-end event)))
 491         (setq buffer (Buffer-menu-buffer t))))
 492     (select-window (posn-window (event-end event)))
 493     (if (and (window-dedicated-p (selected-window))
 494              (eq (selected-window) (frame-root-window)))
 495         (switch-to-buffer-other-frame buffer)
 496       (switch-to-buffer buffer))))
 497
 498 (defun Buffer-menu-this-window ()
 499   "Select this line's buffer in this window."
 500   (interactive)
 501   (switch-to-buffer (Buffer-menu-buffer t)))
 502
 503 (defun Buffer-menu-other-window ()
 504   "Select this line's buffer in other window, leaving buffer menu visible."
 505   (interactive)
 506   (switch-to-buffer-other-window (Buffer-menu-buffer t)))
 507
 508 (defun Buffer-menu-switch-other-window ()
 509   "Make the other window select this line's buffer.
 510 The current window remains selected."
 511   (interactive)
 512   (let ((pop-up-windows t)
 513         same-window-buffer-names
 514         same-window-regexps)
 515     (display-buffer (Buffer-menu-buffer t))))
 516
 517 (defun Buffer-menu-2-window ()
 518   "Select this line's buffer, with previous buffer in second window."
 519   (interactive)
 520   (let ((buff (Buffer-menu-buffer t))
 521         (menu (current-buffer))
 522         (pop-up-windows t)
 523         same-window-buffer-names
 524         same-window-regexps)
 525     (delete-other-windows)
 526     (switch-to-buffer (other-buffer))
 527     (pop-to-buffer buff)
 528     (bury-buffer menu)))
 529
 530 (defun Buffer-menu-toggle-read-only ()
 531   "Toggle read-only status of buffer on this line, perhaps via version control."
 532   (interactive)
 533   (let (char)
 534     (save-excursion
 535       (set-buffer (Buffer-menu-buffer t))
 536       (vc-toggle-read-only)
 537       (setq char (if buffer-read-only ?% ?\s)))
 538     (save-excursion
 539       (beginning-of-line)
 540       (forward-char 1)
 541       (if (/= (following-char) char)
 542           (let (buffer-read-only)
 543             (delete-char 1)
 544             (insert char))))))
 545
 546 (defun Buffer-menu-bury ()
 547   "Bury the buffer listed on this line."
 548   (interactive)
 549   (when (Buffer-menu-no-header)
 550     (save-excursion
 551       (beginning-of-line)
 552       (bury-buffer (Buffer-menu-buffer t))
 553       (let ((line (buffer-substring (point) (progn (forward-line 1) (point))))
 554             (buffer-read-only nil))
 555         (delete-region (point) (progn (forward-line -1) (point)))
 556         (goto-char (point-max))
 557         (insert line))
 558       (message "Buried buffer moved to the end"))))
 559
 560
 561 (defun Buffer-menu-view ()
 562   "View this line's buffer in View mode."
 563   (interactive)
 564   (view-buffer (Buffer-menu-buffer t)))
 565
 566
 567 (defun Buffer-menu-view-other-window ()
 568   "View this line's buffer in View mode in another window."
 569   (interactive)
 570   (view-buffer-other-window (Buffer-menu-buffer t)))
 571 \f
 572
 573 (define-key ctl-x-map "\C-b" 'list-buffers)
 574
 575 (defun list-buffers (&optional files-only)
 576   "Display a list of names of existing buffers.
 577 The list is displayed in a buffer named `*Buffer List*'.
 578 Note that buffers with names starting with spaces are omitted.
 579 Non-null optional arg FILES-ONLY means mention only file buffers.
 580
 581 For more information, see the function `buffer-menu'."
 582   (interactive "P")
 583   (display-buffer (list-buffers-noselect files-only)))
 584
 585 (defun Buffer-menu-buffer+size (name size &optional name-props size-props)
 586   (if (> (+ (length name) (length size) 2) Buffer-menu-buffer+size-width)
 587       (setq name
 588             (if (string-match "<[0-9]+>$" name)
 589                 (concat (substring name 0
 590                                    (- Buffer-menu-buffer+size-width
 591                                       (max (length size) 3)
 592                                       (match-end 0)
 593                                       (- (match-beginning 0))
 594                                       2))
 595                         ":"             ; narrow ellipsis
 596                         (match-string 0 name))
 597               (concat (substring name 0
 598                                  (- Buffer-menu-buffer+size-width
 599                                     (max (length size) 3)
 600                                     2))
 601                       ":")))            ; narrow ellipsis
 602     ;; Don't put properties on (buffer-name).
 603     (setq name (copy-sequence name)))
 604   (add-text-properties 0 (length name) name-props name)
 605   (add-text-properties 0 (length size) size-props size)
 606   (concat name
 607           (make-string (- Buffer-menu-buffer+size-width
 608                           (length name)
 609                           (length size))
 610                        ?\s)
 611           size))
 612
 613 (defun Buffer-menu-sort (column)
 614   "Sort the buffer menu by COLUMN."
 615   (interactive "P")
 616   (when column
 617     (setq column (prefix-numeric-value column))
 618     (if (< column 2) (setq column 2))
 619     (if (> column 5) (setq column 5)))
 620   (setq Buffer-menu-sort-column column)
 621   (let (buffer-read-only l buf m1 m2)
 622     (save-excursion
 623       (Buffer-menu-beginning)
 624       (while (not (eobp))
 625         (when (buffer-live-p (setq buf (get-text-property (+ (point) 4) 'buffer)))
 626           (setq m1 (char-after)
 627                 m1 (if (memq m1 '(?> ?D)) m1)
 628                 m2 (char-after (+ (point) 2))
 629                 m2 (if (eq m2 ?S) m2))
 630           (if (or m1 m2)
 631               (push (list buf m1 m2) l)))
 632         (forward-line)))
 633     (Buffer-menu-revert)
 634     (setq buffer-read-only)
 635     (save-excursion
 636       (Buffer-menu-beginning)
 637       (while (not (eobp))
 638         (when (setq buf (assq (get-text-property (+ (point) 4) 'buffer) l))
 639           (setq m1 (cadr buf)
 640                 m2 (cadr (cdr buf)))
 641           (when m1
 642             (delete-char 1)
 643             (insert m1)
 644             (backward-char 1))
 645           (when m2
 646             (forward-char 2)
 647             (delete-char 1)
 648             (insert m2)))
 649         (forward-line)))))
 650
 651 (defun Buffer-menu-sort-by-column (&optional e)
 652   "Sort the buffer menu by the column clicked on."
 653   (interactive (list last-input-event))
 654   (if e (mouse-select-window e))
 655   (let* ((pos (event-start e))
 656          (obj (posn-object pos))
 657          (col (if obj
 658                   (get-text-property (cdr obj) 'column (car obj))
 659                 (get-text-property (posn-point pos) 'column))))
 660     (Buffer-menu-sort col)))
 661
 662 (defvar Buffer-menu-sort-button-map
 663   (let ((map (make-sparse-keymap)))
 664     ;; This keymap handles both nil and non-nil values for
 665     ;; Buffer-menu-use-header-line.
 666     (define-key map [header-line mouse-1] 'Buffer-menu-sort-by-column)
 667     (define-key map [header-line mouse-2] 'Buffer-menu-sort-by-column)
 668     (define-key map [mouse-2] 'Buffer-menu-sort-by-column)
 669     (define-key map [follow-link] 'mouse-face)
 670     (define-key map "\C-m" 'Buffer-menu-sort-by-column)
 671     map)
 672   "Local keymap for Buffer menu sort buttons.")
 673
 674 (defun Buffer-menu-make-sort-button (name column)
 675   (if (equal column Buffer-menu-sort-column) (setq column nil))
 676   (propertize name
 677               'column column
 678               'help-echo (concat
 679                           (if Buffer-menu-use-header-line
 680                               "mouse-1, mouse-2: sort by "
 681                             "mouse-2, RET: sort by ")
 682                           (if column (downcase name) "visited order"))
 683               'mouse-face 'highlight
 684               'keymap Buffer-menu-sort-button-map))
 685
 686 (defun list-buffers-noselect (&optional files-only buffer-list)
 687   "Create and return a buffer with a list of names of existing buffers.
 688 The buffer is named `*Buffer List*'.
 689 Note that buffers with names starting with spaces are omitted.
 690 Non-null optional arg FILES-ONLY means mention only file buffers.
 691
 692 If BUFFER-LIST is non-nil, it should be a list of buffers;
 693 it means list those buffers and no others.
 694
 695 For more information, see the function `buffer-menu'."
 696   (let* ((old-buffer (current-buffer))
 697          (standard-output standard-output)
 698          (mode-end (make-string (- Buffer-menu-mode-width 2) ?\s))
 699          (header (concat "CRM "
 700                          (Buffer-menu-buffer+size
 701                           (Buffer-menu-make-sort-button "Buffer" 2)
 702                           (Buffer-menu-make-sort-button "Size" 3))
 703                          "  "
 704                          (Buffer-menu-make-sort-button "Mode" 4) mode-end
 705                          (Buffer-menu-make-sort-button "File" 5) "\n"))
 706          list desired-point)
 707     (when Buffer-menu-use-header-line
 708       (let ((pos 0))
 709         ;; Turn spaces in the header into stretch specs so they work
 710         ;; regardless of the header-line face.
 711         (while (string-match "[ \t]+" header pos)
 712           (setq pos (match-end 0))
 713           (put-text-property (match-beginning 0) pos 'display
 714                              ;; Assume fixed-size chars in the buffer.
 715                              (list 'space :align-to pos)
 716                              header)))
 717       ;; Try to better align the one-char headers.
 718       (put-text-property 0 3 'face 'fixed-pitch header)
 719       ;; Add a "dummy" leading space to align the beginning of the header
 720       ;; line with the beginning of the text (rather than with the left
 721       ;; scrollbar or the left fringe).  –-Stef
 722       (setq header (concat (propertize " " 'display '(space :align-to 0))
 723                            header)))
 724     (with-current-buffer (get-buffer-create "*Buffer List*")
 725       (setq buffer-read-only nil)
 726       (erase-buffer)
 727       (setq standard-output (current-buffer))
 728       (unless Buffer-menu-use-header-line
 729         (let ((underline (if (char-displayable-p ?—) ?— ?-)))
 730           (insert header
 731                   (apply 'string
 732                          (mapcar (lambda (c)
 733                                    (if (memq c '(?\n ?\s)) c underline))
 734                                  header)))))
 735       ;; Collect info for every buffer we're interested in.
 736       (dolist (buffer (or buffer-list
 737                           (buffer-list
 738                            (when Buffer-menu-use-frame-buffer-list
 739                              (selected-frame)))))
 740         (with-current-buffer buffer
 741           (let ((name (buffer-name))
 742                 (file buffer-file-name))
 743             (unless (and (not buffer-list)
 744                          (or
 745                           ;; Don't mention internal buffers.
 746                           (and (string= (substring name 0 1) " ") (null file))
 747                           ;; Maybe don't mention buffers without files.
 748                           (and files-only (not file))
 749                           (string= name "*Buffer List*")))
 750               ;; Otherwise output info.
 751               (let ((mode (concat (format-mode-line mode-name nil nil buffer)
 752                                   (if mode-line-process
 753                                       (format-mode-line mode-line-process
 754                                                         nil nil buffer))))
 755                     (bits (string
 756                            (if (eq buffer old-buffer) ?. ?\s)
 757                            ;; Handle readonly status.  The output buffer
 758                            ;; is special cased to appear readonly; it is
 759                            ;; actually made so at a later date.
 760                            (if (or (eq buffer standard-output)
 761                                    buffer-read-only)
 762                                ?% ?\s)
 763                            ;; Identify modified buffers.
 764                            (if (buffer-modified-p) ?* ?\s)
 765                            ;; Space separator.
 766                            ?\s)))
 767                 (unless file
 768                   ;; No visited file.  Check local value of
 769                   ;; list-buffers-directory.
 770                   (when (and (boundp 'list-buffers-directory)
 771                              list-buffers-directory)
 772                     (setq file list-buffers-directory)))
 773                 (push (list buffer bits name (buffer-size) mode file)
 774                       list))))))
 775       ;; Preserve the original buffer-list ordering, just in case.
 776       (setq list (nreverse list))
 777       ;; Place the buffers's info in the output buffer, sorted if necessary.
 778       (dolist (buffer
 779                (if Buffer-menu-sort-column
 780                    (sort list
 781                          (if (eq Buffer-menu-sort-column 3)
 782                              (lambda (a b)
 783                                (< (nth Buffer-menu-sort-column a)
 784                                   (nth Buffer-menu-sort-column b)))
 785                            (lambda (a b)
 786                              (string< (nth Buffer-menu-sort-column a)
 787                                       (nth Buffer-menu-sort-column b)))))
 788                  list))
 789         (if (eq (car buffer) old-buffer)
 790             (setq desired-point (point)))
 791         (insert (cadr buffer)
 792                 ;; Put the buffer name into a text property
 793                 ;; so we don't have to extract it from the text.
 794                 ;; This way we avoid problems with unusual buffer names.
 795                 (Buffer-menu-buffer+size (nth 2 buffer)
 796                                          (int-to-string (nth 3 buffer))
 797                                          `(buffer-name ,(nth 2 buffer)
 798                                            buffer ,(car buffer)
 799                                            font-lock-face buffer-menu-buffer
 800                                            mouse-face highlight
 801                                            help-echo "mouse-2: select this buffer"))
 802                 "  "
 803                 (if (> (length (nth 4 buffer)) Buffer-menu-mode-width)
 804                     (substring (nth 4 buffer) 0 Buffer-menu-mode-width)
 805                   (nth 4 buffer)))
 806         (when (nth 5 buffer)
 807           (indent-to (+ Buffer-menu-buffer-column Buffer-menu-buffer+size-width
 808                         Buffer-menu-mode-width 4) 1)
 809           (princ (abbreviate-file-name (nth 5 buffer))))
 810         (princ "\n"))
 811       (Buffer-menu-mode)
 812       (when Buffer-menu-use-header-line
 813         (setq header-line-format header))
 814       ;; DESIRED-POINT doesn't have to be set; it is not when the
 815       ;; current buffer is not displayed for some reason.
 816       (and desired-point
 817            (goto-char desired-point))
 818       (setq Buffer-menu-files-only files-only)
 819       (set-buffer-modified-p nil)
 820       (current-buffer))))
 821
 822 ;; arch-tag: e7dfcfc9-6cb2-46e4-bf55-8ef1936d83c6
 823 ;;; buff-menu.el ends here