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, 2006, 2007, 2008 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 3, 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   "Which column to sort the menu on.
 106 Use 2 to sort by buffer names, or 5 to sort by file names.
 107 A nil value means sort by visited order (the default).")
 108
 109 (defconst Buffer-menu-buffer-column 4)
 110
 111 (defvar Buffer-menu-files-only nil
 112   "Non-nil if the current buffer-menu lists only file buffers.
 113 This variable determines whether reverting the buffer lists only
 114 file buffers.  It affects both manual reverting and reverting by
 115 Auto Revert Mode.")
 116
 117 (make-variable-buffer-local 'Buffer-menu-files-only)
 118
 119 (defvar Info-current-file) ;; from info.el
 120 (defvar Info-current-node) ;; from info.el
 121
 122 (defvar Buffer-menu-mode-map
 123   (let ((map (make-keymap)))
 124     (suppress-keymap map t)
 125     (define-key map "q" 'quit-window)
 126     (define-key map "v" 'Buffer-menu-select)
 127     (define-key map "2" 'Buffer-menu-2-window)
 128     (define-key map "1" 'Buffer-menu-1-window)
 129     (define-key map "f" 'Buffer-menu-this-window)
 130     (define-key map "e" 'Buffer-menu-this-window)
 131     (define-key map "\C-m" 'Buffer-menu-this-window)
 132     (define-key map "o" 'Buffer-menu-other-window)
 133     (define-key map "\C-o" 'Buffer-menu-switch-other-window)
 134     (define-key map "s" 'Buffer-menu-save)
 135     (define-key map "d" 'Buffer-menu-delete)
 136     (define-key map "k" 'Buffer-menu-delete)
 137     (define-key map "\C-d" 'Buffer-menu-delete-backwards)
 138     (define-key map "\C-k" 'Buffer-menu-delete)
 139     (define-key map "x" 'Buffer-menu-execute)
 140     (define-key map " " 'next-line)
 141     (define-key map "n" 'next-line)
 142     (define-key map "p" 'previous-line)
 143     (define-key map "\177" 'Buffer-menu-backup-unmark)
 144     (define-key map "~" 'Buffer-menu-not-modified)
 145     (define-key map "?" 'describe-mode)
 146     (define-key map "u" 'Buffer-menu-unmark)
 147     (define-key map "m" 'Buffer-menu-mark)
 148     (define-key map "t" 'Buffer-menu-visit-tags-table)
 149     (define-key map "%" 'Buffer-menu-toggle-read-only)
 150     (define-key map "b" 'Buffer-menu-bury)
 151     (define-key map "g" 'Buffer-menu-revert)
 152     (define-key map "V" 'Buffer-menu-view)
 153     (define-key map "T" 'Buffer-menu-toggle-files-only)
 154     (define-key map [mouse-2] 'Buffer-menu-mouse-select)
 155     (define-key map [follow-link] 'mouse-face)
 156     map)
 157   "Local keymap for `Buffer-menu-mode' buffers.")
 158
 159 ;; Buffer Menu mode is suitable only for specially formatted data.
 160 (put 'Buffer-menu-mode 'mode-class 'special)
 161
 162 (define-derived-mode Buffer-menu-mode nil "Buffer Menu"
 163   "Major mode for editing a list of buffers.
 164 Each line describes one of the buffers in Emacs.
 165 Letters do not insert themselves; instead, they are commands.
 166 \\<Buffer-menu-mode-map>
 167 \\[Buffer-menu-mouse-select] -- select buffer you click on, in place of the buffer menu.
 168 \\[Buffer-menu-this-window] -- select current line's buffer in place of the buffer menu.
 169 \\[Buffer-menu-other-window] -- select that buffer in another window,
 170   so the buffer menu buffer remains visible in its window.
 171 \\[Buffer-menu-view] -- select current line's buffer, but in view-mode.
 172 \\[Buffer-menu-view-other-window] -- select that buffer in
 173   another window, in view-mode.
 174 \\[Buffer-menu-switch-other-window] -- make another window display that buffer.
 175 \\[Buffer-menu-mark] -- mark current line's buffer to be displayed.
 176 \\[Buffer-menu-select] -- select current line's buffer.
 177   Also show buffers marked with m, in other windows.
 178 \\[Buffer-menu-1-window] -- select that buffer in full-frame window.
 179 \\[Buffer-menu-2-window] -- select that buffer in one window,
 180   together with buffer selected before this one in another window.
 181 \\[Buffer-menu-visit-tags-table] -- visit-tags-table this buffer.
 182 \\[Buffer-menu-not-modified] -- clear modified-flag on that buffer.
 183 \\[Buffer-menu-save] -- mark that buffer to be saved, and move down.
 184 \\[Buffer-menu-delete] -- mark that buffer to be deleted, and move down.
 185 \\[Buffer-menu-delete-backwards] -- mark that buffer to be deleted, and move up.
 186 \\[Buffer-menu-execute] -- delete or save marked buffers.
 187 \\[Buffer-menu-unmark] -- remove all kinds of marks from current line.
 188   With prefix argument, also move up one line.
 189 \\[Buffer-menu-backup-unmark] -- back up a line and remove marks.
 190 \\[Buffer-menu-toggle-read-only] -- toggle read-only status of buffer on this line.
 191 \\[Buffer-menu-revert] -- update the list of buffers.
 192 \\[Buffer-menu-toggle-files-only] -- toggle whether the menu displays only file buffers.
 193 \\[Buffer-menu-bury] -- bury the buffer listed on this line."
 194   (set (make-local-variable 'revert-buffer-function)
 195        'Buffer-menu-revert-function)
 196   (set (make-local-variable 'buffer-stale-function)
 197        #'(lambda (&optional noconfirm) 'fast))
 198   (setq truncate-lines t)
 199   (setq buffer-read-only t))
 200
 201 ;; This function exists so we can make the doc string of Buffer-menu-mode
 202 ;; look nice.
 203 (defun Buffer-menu-revert ()
 204   "Update the list of buffers."
 205   (interactive)
 206   (revert-buffer))
 207
 208 (defun Buffer-menu-revert-function (ignore1 ignore2)
 209   (or (eq buffer-undo-list t)
 210       (setq buffer-undo-list nil))
 211   ;; We can not use save-excursion here.  The buffer gets erased.
 212   (let ((opoint (point))
 213         (eobp (eobp))
 214         (ocol (current-column))
 215         (oline (progn (move-to-column 4)
 216                       (get-text-property (point) 'buffer)))
 217         (prop (point-min))
 218         ;; do not make undo records for the reversion.
 219         (buffer-undo-list t))
 220     ;; We can be called by Auto Revert Mode with the "*Buffer Menu*"
 221     ;; temporarily the current buffer.  Make sure that the
 222     ;; interactively current buffer is correctly identified with a `.'
 223     ;; by `list-buffers-noselect'.
 224     (with-current-buffer (window-buffer)
 225       (list-buffers-noselect Buffer-menu-files-only))
 226     (if oline
 227         (while (setq prop (next-single-property-change prop 'buffer))
 228           (when (eq (get-text-property prop 'buffer) oline)
 229             (goto-char prop)
 230             (move-to-column ocol)))
 231       (goto-char (if eobp (point-max) opoint)))))
 232
 233 (defun Buffer-menu-toggle-files-only (arg)
 234   "Toggle whether the current buffer-menu displays only file buffers.
 235 With a positive ARG display only file buffers.  With zero or
 236 negative ARG, display other buffers as well."
 237   (interactive "P")
 238   (setq Buffer-menu-files-only
 239         (cond ((not arg) (not Buffer-menu-files-only))
 240               ((> (prefix-numeric-value arg) 0) t)))
 241   (revert-buffer))
 242
 243 \f
 244 (defun Buffer-menu-buffer (error-if-non-existent-p)
 245   "Return buffer described by this line of buffer menu."
 246   (let* ((where (save-excursion
 247                   (beginning-of-line)
 248                   (+ (point) Buffer-menu-buffer-column)))
 249          (name (and (not (eobp)) (get-text-property where 'buffer-name)))
 250          (buf (and (not (eobp)) (get-text-property where 'buffer))))
 251     (if name
 252         (or (get-buffer name)
 253             (and buf (buffer-name buf) buf)
 254             (if error-if-non-existent-p
 255                 (error "No buffer named `%s'" name)
 256               nil))
 257       (or (and buf (buffer-name buf) buf)
 258           (if error-if-non-existent-p
 259               (error "No buffer on this line")
 260             nil)))))
 261 \f
 262 (defun buffer-menu (&optional arg)
 263   "Make a menu of buffers so you can save, delete or select them.
 264 With argument, show only buffers that are visiting files.
 265 Type ? after invocation to get help on commands available.
 266 Type q to remove the buffer menu from the display.
 267
 268 The first column shows `>' for a buffer you have
 269 marked to be displayed, `D' for one you have marked for
 270 deletion, and `.' for the current buffer.
 271
 272 The C column has a `.' for the buffer from which you came.
 273 The R column has a `%' if the buffer is read-only.
 274 The M column has a `*' if it is modified,
 275 or `S' if you have marked it for saving.
 276 After this come the buffer name, its size in characters,
 277 its major mode, and the visited file name (if any)."
 278   (interactive "P")
 279 ;;;  (setq Buffer-menu-window-config (current-window-configuration))
 280   (switch-to-buffer (list-buffers-noselect arg))
 281   (message
 282    "Commands: d, s, x, u; f, o, 1, 2, m, v; ~, %%; q to quit; ? for help."))
 283
 284 (defun buffer-menu-other-window (&optional arg)
 285   "Display a list of buffers in another window.
 286 With the buffer list buffer, you can save, delete or select the buffers.
 287 With argument, show only buffers that are visiting files.
 288 Type ? after invocation to get help on commands available.
 289 Type q to remove the buffer menu from the display.
 290 For more information, see the function `buffer-menu'."
 291   (interactive "P")
 292 ;;;  (setq Buffer-menu-window-config (current-window-configuration))
 293   (switch-to-buffer-other-window (list-buffers-noselect arg))
 294   (message
 295    "Commands: d, s, x, u; f, o, 1, 2, m, v; ~, %%; q to quit; ? for help."))
 296
 297 (defun Buffer-menu-no-header ()
 298   (beginning-of-line)
 299   (if (or Buffer-menu-use-header-line
 300           (not (eq (char-after) ?C)))
 301       t
 302     (ding)
 303     (forward-line 1)
 304     nil))
 305
 306 (defun Buffer-menu-mark ()
 307   "Mark buffer on this line for being displayed by \\<Buffer-menu-mode-map>\\[Buffer-menu-select] command."
 308   (interactive)
 309   (when (Buffer-menu-no-header)
 310     (let ((buffer-read-only nil))
 311       (delete-char 1)
 312       (insert ?>)
 313       (forward-line 1))))
 314
 315 (defun Buffer-menu-unmark (&optional backup)
 316   "Cancel all requested operations on buffer on this line and move down.
 317 Optional prefix arg means move up."
 318   (interactive "P")
 319   (when (Buffer-menu-no-header)
 320     (let* ((buf (Buffer-menu-buffer t))
 321            (mod (buffer-modified-p buf))
 322            (readonly (save-excursion (set-buffer buf) buffer-read-only))
 323            (buffer-read-only nil))
 324       (delete-char 3)
 325       (insert (if readonly (if mod " %*" " % ") (if mod "  *" "   ")))))
 326   (forward-line (if backup -1 1)))
 327
 328 (defun Buffer-menu-backup-unmark ()
 329   "Move up and cancel all requested operations on buffer on line above."
 330   (interactive)
 331   (forward-line -1)
 332   (Buffer-menu-unmark)
 333   (forward-line -1))
 334
 335 (defun Buffer-menu-delete (&optional arg)
 336   "Mark buffer on this line to be deleted by \\<Buffer-menu-mode-map>\\[Buffer-menu-execute] command.
 337 Prefix arg is how many buffers to delete.
 338 Negative arg means delete backwards."
 339   (interactive "p")
 340   (when (Buffer-menu-no-header)
 341     (let ((buffer-read-only nil))
 342       (if (or (null arg) (= arg 0))
 343           (setq arg 1))
 344       (while (> arg 0)
 345         (delete-char 1)
 346         (insert ?D)
 347         (forward-line 1)
 348         (setq arg (1- arg)))
 349       (while (and (< arg 0)
 350                   (Buffer-menu-no-header))
 351         (delete-char 1)
 352         (insert ?D)
 353         (forward-line -1)
 354         (setq arg (1+ arg))))))
 355
 356 (defun Buffer-menu-delete-backwards (&optional arg)
 357   "Mark buffer on this line to be deleted by \\<Buffer-menu-mode-map>\\[Buffer-menu-execute] command
 358 and then move up one line.  Prefix arg means move that many lines."
 359   (interactive "p")
 360   (Buffer-menu-delete (- (or arg 1))))
 361
 362 (defun Buffer-menu-save ()
 363   "Mark buffer on this line to be saved by \\<Buffer-menu-mode-map>\\[Buffer-menu-execute] command."
 364   (interactive)
 365   (when (Buffer-menu-no-header)
 366     (let ((buffer-read-only nil))
 367       (forward-char 2)
 368       (delete-char 1)
 369       (insert ?S)
 370       (forward-line 1))))
 371
 372 (defun Buffer-menu-not-modified (&optional arg)
 373   "Mark buffer on this line as unmodified (no changes to save)."
 374   (interactive "P")
 375   (save-excursion
 376     (set-buffer (Buffer-menu-buffer t))
 377     (set-buffer-modified-p arg))
 378   (save-excursion
 379    (beginning-of-line)
 380    (forward-char 2)
 381    (if (= (char-after) (if arg ?\s ?*))
 382        (let ((buffer-read-only nil))
 383          (delete-char 1)
 384          (insert (if arg ?* ?\s))))))
 385
 386 (defun Buffer-menu-beginning ()
 387   (goto-char (point-min))
 388   (unless Buffer-menu-use-header-line
 389     (forward-line)))
 390
 391 (defun Buffer-menu-execute ()
 392   "Save and/or delete buffers marked with \\<Buffer-menu-mode-map>\\[Buffer-menu-save] or \\<Buffer-menu-mode-map>\\[Buffer-menu-delete] commands."
 393   (interactive)
 394   (save-excursion
 395     (Buffer-menu-beginning)
 396     (while (re-search-forward "^..S" nil t)
 397       (let ((modp nil))
 398         (save-excursion
 399           (set-buffer (Buffer-menu-buffer t))
 400           (save-buffer)
 401           (setq modp (buffer-modified-p)))
 402         (let ((buffer-read-only nil))
 403           (delete-char -1)
 404           (insert (if modp ?* ?\s))))))
 405   (save-excursion
 406     (Buffer-menu-beginning)
 407     (let ((buff-menu-buffer (current-buffer))
 408           (buffer-read-only nil))
 409       (while (re-search-forward "^D" nil t)
 410         (forward-char -1)
 411         (let ((buf (Buffer-menu-buffer nil)))
 412           (or (eq buf nil)
 413               (eq buf buff-menu-buffer)
 414               (save-excursion (kill-buffer buf)))
 415           (if (and buf (buffer-name buf))
 416             (progn (delete-char 1)
 417                    (insert ?\s))
 418           (delete-region (point) (progn (forward-line 1) (point)))
 419             (unless (bobp)
 420               (forward-char -1))))))))
 421
 422 (defun Buffer-menu-select ()
 423   "Select this line's buffer; also display buffers marked with `>'.
 424 You can mark buffers with the \\<Buffer-menu-mode-map>\\[Buffer-menu-mark] command.
 425 This command deletes and replaces all the previously existing windows
 426 in the selected frame."
 427   (interactive)
 428   (let ((buff (Buffer-menu-buffer t))
 429         (menu (current-buffer))
 430         (others ())
 431         tem)
 432     (Buffer-menu-beginning)
 433     (while (re-search-forward "^>" nil t)
 434       (setq tem (Buffer-menu-buffer t))
 435       (let ((buffer-read-only nil))
 436         (delete-char -1)
 437         (insert ?\s))
 438       (or (eq tem buff) (memq tem others) (setq others (cons tem others))))
 439     (setq others (nreverse others)
 440           tem (/ (1- (frame-height)) (1+ (length others))))
 441     (delete-other-windows)
 442     (switch-to-buffer buff)
 443     (or (eq menu buff)
 444         (bury-buffer menu))
 445     (if (equal (length others) 0)
 446         (progn
 447 ;;;       ;; Restore previous window configuration before displaying
 448 ;;;       ;; selected buffers.
 449 ;;;       (if Buffer-menu-window-config
 450 ;;;           (progn
 451 ;;;             (set-window-configuration Buffer-menu-window-config)
 452 ;;;             (setq Buffer-menu-window-config nil)))
 453           (switch-to-buffer buff))
 454       (while others
 455         (split-window nil tem)
 456         (other-window 1)
 457         (switch-to-buffer (car others))
 458         (setq others (cdr others)))
 459       (other-window 1)                          ;back to the beginning!
 460 )))
 461
 462
 463 \f
 464 (defun Buffer-menu-visit-tags-table ()
 465   "Visit the tags table in the buffer on this line.  See `visit-tags-table'."
 466   (interactive)
 467   (let ((file (buffer-file-name (Buffer-menu-buffer t))))
 468     (if file
 469         (visit-tags-table file)
 470       (error "Specified buffer has no file"))))
 471
 472 (defun Buffer-menu-1-window ()
 473   "Select this line's buffer, alone, in full frame."
 474   (interactive)
 475   (switch-to-buffer (Buffer-menu-buffer t))
 476   (bury-buffer (other-buffer))
 477   (delete-other-windows))
 478
 479 (defun Buffer-menu-mouse-select (event)
 480   "Select the buffer whose line you click on."
 481   (interactive "e")
 482   (let (buffer)
 483     (save-excursion
 484       (set-buffer (window-buffer (posn-window (event-end event))))
 485       (save-excursion
 486         (goto-char (posn-point (event-end event)))
 487         (setq buffer (Buffer-menu-buffer t))))
 488     (select-window (posn-window (event-end event)))
 489     (if (and (window-dedicated-p (selected-window))
 490              (eq (selected-window) (frame-root-window)))
 491         (switch-to-buffer-other-frame buffer)
 492       (switch-to-buffer buffer))))
 493
 494 (defun Buffer-menu-this-window ()
 495   "Select this line's buffer in this window."
 496   (interactive)
 497   (switch-to-buffer (Buffer-menu-buffer t)))
 498
 499 (defun Buffer-menu-other-window ()
 500   "Select this line's buffer in other window, leaving buffer menu visible."
 501   (interactive)
 502   (switch-to-buffer-other-window (Buffer-menu-buffer t)))
 503
 504 (defun Buffer-menu-switch-other-window ()
 505   "Make the other window select this line's buffer.
 506 The current window remains selected."
 507   (interactive)
 508   (let ((pop-up-windows t)
 509         same-window-buffer-names
 510         same-window-regexps)
 511     (display-buffer (Buffer-menu-buffer t))))
 512
 513 (defun Buffer-menu-2-window ()
 514   "Select this line's buffer, with previous buffer in second window."
 515   (interactive)
 516   (let ((buff (Buffer-menu-buffer t))
 517         (menu (current-buffer))
 518         (pop-up-windows t)
 519         same-window-buffer-names
 520         same-window-regexps)
 521     (delete-other-windows)
 522     (switch-to-buffer (other-buffer))
 523     (pop-to-buffer buff)
 524     (bury-buffer menu)))
 525
 526 (defun Buffer-menu-toggle-read-only ()
 527   "Toggle read-only status of buffer on this line, perhaps via version control."
 528   (interactive)
 529   (let (char)
 530     (save-excursion
 531       (set-buffer (Buffer-menu-buffer t))
 532       (vc-toggle-read-only)
 533       (setq char (if buffer-read-only ?% ?\s)))
 534     (save-excursion
 535       (beginning-of-line)
 536       (forward-char 1)
 537       (if (/= (following-char) char)
 538           (let (buffer-read-only)
 539             (delete-char 1)
 540             (insert char))))))
 541
 542 (defun Buffer-menu-bury ()
 543   "Bury the buffer listed on this line."
 544   (interactive)
 545   (when (Buffer-menu-no-header)
 546     (save-excursion
 547       (beginning-of-line)
 548       (bury-buffer (Buffer-menu-buffer t))
 549       (let ((line (buffer-substring (point) (progn (forward-line 1) (point))))
 550             (buffer-read-only nil))
 551         (delete-region (point) (progn (forward-line -1) (point)))
 552         (goto-char (point-max))
 553         (insert line))
 554       (message "Buried buffer moved to the end"))))
 555
 556
 557 (defun Buffer-menu-view ()
 558   "View this line's buffer in View mode."
 559   (interactive)
 560   (view-buffer (Buffer-menu-buffer t)))
 561
 562
 563 (defun Buffer-menu-view-other-window ()
 564   "View this line's buffer in View mode in another window."
 565   (interactive)
 566   (view-buffer-other-window (Buffer-menu-buffer t)))
 567 \f
 568
 569 (define-key ctl-x-map "\C-b" 'list-buffers)
 570
 571 (defun list-buffers (&optional files-only)
 572   "Display a list of names of existing buffers.
 573 The list is displayed in a buffer named `*Buffer List*'.
 574 Note that buffers with names starting with spaces are omitted.
 575 Non-null optional arg FILES-ONLY means mention only file buffers.
 576
 577 For more information, see the function `buffer-menu'."
 578   (interactive "P")
 579   (display-buffer (list-buffers-noselect files-only)))
 580
 581 (defun Buffer-menu-buffer+size (name size &optional name-props size-props)
 582   (if (> (+ (length name) (length size) 2) Buffer-menu-buffer+size-width)
 583       (setq name
 584             (if (string-match "<[0-9]+>$" name)
 585                 (concat (substring name 0
 586                                    (- Buffer-menu-buffer+size-width
 587                                       (max (length size) 3)
 588                                       (match-end 0)
 589                                       (- (match-beginning 0))
 590                                       2))
 591                         ":"             ; narrow ellipsis
 592                         (match-string 0 name))
 593               (concat (substring name 0
 594                                  (- Buffer-menu-buffer+size-width
 595                                     (max (length size) 3)
 596                                     2))
 597                       ":")))            ; narrow ellipsis
 598     ;; Don't put properties on (buffer-name).
 599     (setq name (copy-sequence name)))
 600   (add-text-properties 0 (length name) name-props name)
 601   (add-text-properties 0 (length size) size-props size)
 602   (concat name
 603           (make-string (- Buffer-menu-buffer+size-width
 604                           (length name)
 605                           (length size))
 606                        ?\s)
 607           size))
 608
 609 (defun Buffer-menu-sort (column)
 610   "Sort the buffer menu by COLUMN."
 611   (interactive "P")
 612   (when column
 613     (setq column (prefix-numeric-value column))
 614     (if (< column 2) (setq column 2))
 615     (if (> column 5) (setq column 5)))
 616   (setq Buffer-menu-sort-column column)
 617   (let (buffer-read-only l buf m1 m2)
 618     (save-excursion
 619       (Buffer-menu-beginning)
 620       (while (not (eobp))
 621         (when (buffer-live-p (setq buf (get-text-property (+ (point) 4) 'buffer)))
 622           (setq m1 (char-after)
 623                 m1 (if (memq m1 '(?> ?D)) m1)
 624                 m2 (char-after (+ (point) 2))
 625                 m2 (if (eq m2 ?S) m2))
 626           (if (or m1 m2)
 627               (push (list buf m1 m2) l)))
 628         (forward-line)))
 629     (Buffer-menu-revert)
 630     (setq buffer-read-only)
 631     (save-excursion
 632       (Buffer-menu-beginning)
 633       (while (not (eobp))
 634         (when (setq buf (assq (get-text-property (+ (point) 4) 'buffer) l))
 635           (setq m1 (cadr buf)
 636                 m2 (cadr (cdr buf)))
 637           (when m1
 638             (delete-char 1)
 639             (insert m1)
 640             (backward-char 1))
 641           (when m2
 642             (forward-char 2)
 643             (delete-char 1)
 644             (insert m2)))
 645         (forward-line)))))
 646
 647 (defun Buffer-menu-sort-by-column (&optional e)
 648   "Sort the buffer menu by the column clicked on."
 649   (interactive (list last-input-event))
 650   (if e (mouse-select-window e))
 651   (let* ((pos (event-start e))
 652          (obj (posn-object pos))
 653          (col (if obj
 654                   (get-text-property (cdr obj) 'column (car obj))
 655                 (get-text-property (posn-point pos) 'column))))
 656     (Buffer-menu-sort col)))
 657
 658 (defvar Buffer-menu-sort-button-map
 659   (let ((map (make-sparse-keymap)))
 660     ;; This keymap handles both nil and non-nil values for
 661     ;; Buffer-menu-use-header-line.
 662     (define-key map [header-line mouse-1] 'Buffer-menu-sort-by-column)
 663     (define-key map [header-line mouse-2] 'Buffer-menu-sort-by-column)
 664     (define-key map [mouse-2] 'Buffer-menu-sort-by-column)
 665     (define-key map [follow-link] 'mouse-face)
 666     (define-key map "\C-m" 'Buffer-menu-sort-by-column)
 667     map)
 668   "Local keymap for Buffer menu sort buttons.")
 669
 670 (defun Buffer-menu-make-sort-button (name column)
 671   (if (equal column Buffer-menu-sort-column) (setq column nil))
 672   (propertize name
 673               'column column
 674               'help-echo (concat
 675                           (if Buffer-menu-use-header-line
 676                               "mouse-1, mouse-2: sort by "
 677                             "mouse-2, RET: sort by ")
 678                           (if column (downcase name) "visited order"))
 679               'mouse-face 'highlight
 680               'keymap Buffer-menu-sort-button-map))
 681
 682 (defun list-buffers-noselect (&optional files-only buffer-list)
 683   "Create and return a buffer with a list of names of existing buffers.
 684 The buffer is named `*Buffer List*'.
 685 Note that buffers with names starting with spaces are omitted.
 686 Non-null optional arg FILES-ONLY means mention only file buffers.
 687
 688 If BUFFER-LIST is non-nil, it should be a list of buffers;
 689 it means list those buffers and no others.
 690
 691 For more information, see the function `buffer-menu'."
 692   (let* ((old-buffer (current-buffer))
 693          (standard-output standard-output)
 694          (mode-end (make-string (- Buffer-menu-mode-width 2) ?\s))
 695          (header (concat "CRM "
 696                          (Buffer-menu-buffer+size
 697                           (Buffer-menu-make-sort-button "Buffer" 2)
 698                           (Buffer-menu-make-sort-button "Size" 3))
 699                          "  "
 700                          (Buffer-menu-make-sort-button "Mode" 4) mode-end
 701                          (Buffer-menu-make-sort-button "File" 5) "\n"))
 702          list desired-point)
 703     (when Buffer-menu-use-header-line
 704       (let ((pos 0))
 705         ;; Turn whitespace chars in the header into stretch specs so
 706         ;; they work regardless of the header-line face.
 707         (while (string-match "[ \t\n]+" header pos)
 708           (setq pos (match-end 0))
 709           (put-text-property (match-beginning 0) pos 'display
 710                              ;; Assume fixed-size chars in the buffer.
 711                              (list 'space :align-to pos)
 712                              header)))
 713       ;; Try to better align the one-char headers.
 714       (put-text-property 0 3 'face 'fixed-pitch header)
 715       ;; Add a "dummy" leading space to align the beginning of the header
 716       ;; line with the beginning of the text (rather than with the left
 717       ;; scrollbar or the left fringe).  --Stef
 718       (setq header (concat (propertize " " 'display '(space :align-to 0))
 719                            header)))
 720     (with-current-buffer (get-buffer-create "*Buffer List*")
 721       (setq buffer-read-only nil)
 722       (erase-buffer)
 723       (setq standard-output (current-buffer))
 724       (unless Buffer-menu-use-header-line
 725         ;; Use U+2014 (EM DASH) to underline if possible, else use ASCII
 726         ;; (i.e. U+002D, HYPHEN-MINUS).
 727         (let ((underline (if (char-displayable-p ?\u2014) ?\u2014 ?-)))
 728           (insert header
 729                   (apply 'string
 730                          (mapcar (lambda (c)
 731                                    (if (memq c '(?\n ?\s)) c underline))
 732                                  header)))))
 733       ;; Collect info for every buffer we're interested in.
 734       (dolist (buffer (or buffer-list
 735                           (buffer-list
 736                            (when Buffer-menu-use-frame-buffer-list
 737                              (selected-frame)))))
 738         (with-current-buffer buffer
 739           (let ((name (buffer-name))
 740                 (file buffer-file-name))
 741             (unless (and (not buffer-list)
 742                          (or
 743                           ;; Don't mention internal buffers.
 744                           (and (string= (substring name 0 1) " ") (null file))
 745                           ;; Maybe don't mention buffers without files.
 746                           (and files-only (not file))
 747                           (string= name "*Buffer List*")))
 748               ;; Otherwise output info.
 749               (let ((mode (concat (format-mode-line mode-name nil nil buffer)
 750                                   (if mode-line-process
 751                                       (format-mode-line mode-line-process
 752                                                         nil nil buffer))))
 753                     (bits (string
 754                            (if (eq buffer old-buffer) ?. ?\s)
 755                            ;; Handle readonly status.  The output buffer
 756                            ;; is special cased to appear readonly; it is
 757                            ;; actually made so at a later date.
 758                            (if (or (eq buffer standard-output)
 759                                    buffer-read-only)
 760                                ?% ?\s)
 761                            ;; Identify modified buffers.
 762                            (if (buffer-modified-p) ?* ?\s)
 763                            ;; Space separator.
 764                            ?\s)))
 765                 (unless file
 766                   ;; No visited file.  Check local value of
 767                   ;; list-buffers-directory and, for Info buffers,
 768                   ;; Info-current-file.
 769                   (cond ((and (boundp 'list-buffers-directory)
 770                               list-buffers-directory)
 771                          (setq file list-buffers-directory))
 772                         ((eq major-mode 'Info-mode)
 773                          (setq file Info-current-file)
 774                          (cond
 775                           ((equal file "dir")
 776                            (setq file "*Info Directory*"))
 777                           ((eq file 'apropos)
 778                            (setq file "*Info Apropos*"))
 779                           ((eq file 'history)
 780                            (setq file "*Info History*"))
 781                           ((eq file 'toc)
 782                            (setq file "*Info TOC*"))
 783                           ((not (stringp file))  ;; avoid errors
 784                            (setq file nil))
 785                           (t
 786                            (setq file (concat "("
 787                                               (file-name-nondirectory file)
 788                                               ")"
 789                                               Info-current-node)))))))
 790                 (push (list buffer bits name (buffer-size) mode file)
 791                       list))))))
 792       ;; Preserve the original buffer-list ordering, just in case.
 793       (setq list (nreverse list))
 794       ;; Place the buffers's info in the output buffer, sorted if necessary.
 795       (dolist (buffer
 796                (if Buffer-menu-sort-column
 797                    (sort list
 798                          (if (eq Buffer-menu-sort-column 3)
 799                              (lambda (a b)
 800                                (< (nth Buffer-menu-sort-column a)
 801                                   (nth Buffer-menu-sort-column b)))
 802                            (lambda (a b)
 803                              (string< (nth Buffer-menu-sort-column a)
 804                                       (nth Buffer-menu-sort-column b)))))
 805                  list))
 806         (if (eq (car buffer) old-buffer)
 807             (setq desired-point (point)))
 808         (insert (cadr buffer)
 809                 ;; Put the buffer name into a text property
 810                 ;; so we don't have to extract it from the text.
 811                 ;; This way we avoid problems with unusual buffer names.
 812                 (let ((name (nth 2 buffer))
 813                       (size (int-to-string (nth 3 buffer))))
 814                       (Buffer-menu-buffer+size name size
 815                          `(buffer-name ,name
 816                                        buffer ,(car buffer)
 817                                        font-lock-face buffer-menu-buffer
 818                                        mouse-face highlight
 819                                        help-echo
 820                                        ,(if (>= (length name)
 821                                                 (- Buffer-menu-buffer+size-width
 822                                                    (max (length size) 3)
 823                                                    2))
 824                                             name
 825                                           "mouse-2: select this buffer"))))
 826                   "  "
 827                 (if (> (length (nth 4 buffer)) Buffer-menu-mode-width)
 828                     (substring (nth 4 buffer) 0 Buffer-menu-mode-width)
 829                   (nth 4 buffer)))
 830         (when (nth 5 buffer)
 831           (indent-to (+ Buffer-menu-buffer-column Buffer-menu-buffer+size-width
 832                         Buffer-menu-mode-width 4) 1)
 833           (princ (abbreviate-file-name (nth 5 buffer))))
 834         (princ "\n"))
 835       (Buffer-menu-mode)
 836       (when Buffer-menu-use-header-line
 837         (setq header-line-format header))
 838       ;; DESIRED-POINT doesn't have to be set; it is not when the
 839       ;; current buffer is not displayed for some reason.
 840       (and desired-point
 841            (goto-char desired-point))
 842       (setq Buffer-menu-files-only files-only)
 843       (set-buffer-modified-p nil)
 844       (current-buffer))))
 845
 846 ;; arch-tag: e7dfcfc9-6cb2-46e4-bf55-8ef1936d83c6
 847 ;;; buff-menu.el ends here