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+;; Buffer menu main function and support functions.
+;; Copyright (C) 1985, 1986, 1987 Free Software Foundation, Inc.
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 1, or (at your option)
+;; any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to
+;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+
+; Put buffer *Buffer List* into proper mode right away
+; so that from now on even list-buffers is enough to get a buffer menu.
+
+(defvar Buffer-menu-mode-map nil "")
+
+(if Buffer-menu-mode-map
+    ()
+  (setq Buffer-menu-mode-map (make-keymap))
+  (suppress-keymap Buffer-menu-mode-map t)
+  (define-key Buffer-menu-mode-map "q" 'Buffer-menu-select)
+  (define-key Buffer-menu-mode-map "2" 'Buffer-menu-2-window)
+  (define-key Buffer-menu-mode-map "1" 'Buffer-menu-1-window)
+  (define-key Buffer-menu-mode-map "f" 'Buffer-menu-this-window)
+  (define-key Buffer-menu-mode-map "o" 'Buffer-menu-other-window)
+  (define-key Buffer-menu-mode-map "s" 'Buffer-menu-save)
+  (define-key Buffer-menu-mode-map "d" 'Buffer-menu-delete)
+  (define-key Buffer-menu-mode-map "k" 'Buffer-menu-delete)
+  (define-key Buffer-menu-mode-map "\C-d" 'Buffer-menu-delete-backwards)
+  (define-key Buffer-menu-mode-map "\C-k" 'Buffer-menu-delete)
+  (define-key Buffer-menu-mode-map "x" 'Buffer-menu-execute)
+  (define-key Buffer-menu-mode-map " " 'next-line)
+  (define-key Buffer-menu-mode-map "n" 'next-line)
+  (define-key Buffer-menu-mode-map "p" 'previous-line)
+  (define-key Buffer-menu-mode-map "\177" 'Buffer-menu-backup-unmark)
+  (define-key Buffer-menu-mode-map "~" 'Buffer-menu-not-modified)
+  (define-key Buffer-menu-mode-map "?" 'describe-mode)
+  (define-key Buffer-menu-mode-map "u" 'Buffer-menu-unmark)
+  (define-key Buffer-menu-mode-map "m" 'Buffer-menu-mark)
+  (define-key Buffer-menu-mode-map "t" 'Buffer-menu-visit-tags-table))
+
+;; Buffer Menu mode is suitable only for specially formatted data.
+(put 'Buffer-menu-mode 'mode-class 'special)
+
+(defun Buffer-menu-mode ()
+  "Major mode for editing a list of buffers.
+Each line describes one of the buffers in Emacs.
+Letters do not insert themselves; instead, they are commands.
+\\<Buffer-menu-mode-map>
+\\[Buffer-menu-mark] -- mark buffer to be displayed.
+\\[Buffer-menu-select] -- select buffer of line point is on.
+  Also show buffers marked with m in other windows.
+\\[Buffer-menu-1-window] -- select that buffer in full-screen window.
+\\[Buffer-menu-2-window] -- select that buffer in one window,
+  together with buffer selected before this one in another window.
+\\[Buffer-menu-this-window] -- select that buffer in place of the buffer menu buffer.
+\\[Buffer-menu-other-window] -- select that buffer in another window,
+  so the buffer menu buffer remains visible in its window.
+\\[Buffer-menu-visit-tags-table] -- visit-tags-table this buffer.
+\\[Buffer-menu-not-modified] -- clear modified-flag on that buffer.
+\\[Buffer-menu-save] -- mark that buffer to be saved, and move down.
+\\[Buffer-menu-delete] -- mark that buffer to be deleted, and move down.
+\\[Buffer-menu-delete-backwards] -- mark that buffer to be deleted, and move up.
+\\[Buffer-menu-execute] -- delete or save marked buffers.
+\\[Buffer-menu-unmark] -- remove all kinds of marks from current line.
+\\[Buffer-menu-backup-unmark] -- back up a line and remove marks."
+  (kill-all-local-variables)
+  (use-local-map Buffer-menu-mode-map)
+  (setq truncate-lines t)
+  (setq buffer-read-only t)
+  (setq major-mode 'Buffer-menu-mode)
+  (setq mode-name "Buffer Menu")
+  (run-hooks 'buffer-menu-mode-hook))
+
+(defvar Buffer-menu-buffer-column 4)
+
+(defun Buffer-menu-buffer (error-if-non-existent-p)
+  "Return buffer described by this line of buffer menu."
+  (save-excursion
+    (beginning-of-line)
+    (forward-char Buffer-menu-buffer-column)
+    (let ((start (point))
+	  string)
+      ;; End of buffer name marked by tab or two spaces.
+      (re-search-forward "\t\\|  ")
+      (skip-chars-backward " \t")
+      (setq string (buffer-substring start (point)))
+      (or (get-buffer string)
+	  (if error-if-non-existent-p
+	      (error "No buffer named \"%s\"" string)
+	    nil)))))
+
+(defun buffer-menu (arg)
+  "Make a menu of buffers so you can save, delete or select them.
+With argument, show only buffers that are visiting files.
+Type ? after invocation to get help on commands available.
+Type q immediately to make the buffer menu go away."
+  (interactive "P")
+  (list-buffers arg)
+  (pop-to-buffer "*Buffer List*")
+  (forward-line 2)
+  (message
+   "Commands: d, s, x; 1, 2, m, u, q; delete; ~;  ? for help."))
+
+(defun Buffer-menu-mark ()
+  "Mark buffer on this line for being displayed by \\<Buffer-menu-mode-map>\\[Buffer-menu-select] command."
+  (interactive)
+  (beginning-of-line)
+  (if (looking-at " [-M]")
+      (ding)
+    (let ((buffer-read-only nil))
+      (delete-char 1)
+      (insert ?>)
+      (forward-line 1))))
+
+(defun Buffer-menu-unmark ()
+  "Cancel all requested operations on buffer on this line."
+  (interactive)
+  (beginning-of-line)
+  (if (looking-at " [-M]")
+      (ding)
+    (let* ((buf (Buffer-menu-buffer t))
+	   (mod (buffer-modified-p buf))
+	   (readonly (save-excursion (set-buffer buf) buffer-read-only))
+	   (buffer-read-only nil))
+      (delete-char 3)
+      (insert (if readonly (if mod " *%" "  %") (if mod " * " "   ")))))
+  (forward-line 1))
+
+(defun Buffer-menu-backup-unmark ()
+  "Move up and cancel all requested operations on buffer on line above."
+  (interactive)
+  (forward-line -1)
+  (Buffer-menu-unmark)
+  (forward-line -1))
+
+(defun Buffer-menu-delete ()
+  "Mark buffer on this line to be deleted by \\<Buffer-menu-mode-map>\\[Buffer-menu-execute] command."
+  (interactive)
+  (beginning-of-line)
+  (if (looking-at " [-M]")		;header lines
+      (ding)
+    (let ((buffer-read-only nil))
+      (delete-char 1)
+      (insert ?D)
+      (forward-line 1))))
+
+(defun Buffer-menu-delete-backwards ()
+  "Mark buffer on this line to be deleted by \\<Buffer-menu-mode-map>\\[Buffer-menu-execute] command
+and then move up one line"
+  (interactive)
+  (Buffer-menu-delete)
+  (forward-line -2)
+  (if (looking-at " [-M]") (forward-line 1)))
+
+(defun Buffer-menu-save ()
+  "Mark buffer on this line to be saved by \\<Buffer-menu-mode-map>\\[Buffer-menu-execute] command."
+  (interactive)
+  (beginning-of-line)
+  (forward-char 1)
+  (if (looking-at " [-M]")		;header lines
+      (ding)
+    (let ((buffer-read-only nil))
+      (delete-char 1)
+      (insert ?S)
+      (forward-line 1))))
+
+(defun Buffer-menu-not-modified ()
+  "Mark buffer on this line as unmodified (no changes to save)."
+  (interactive)
+  (save-excursion
+    (set-buffer (Buffer-menu-buffer t))
+    (set-buffer-modified-p nil))
+  (save-excursion
+   (beginning-of-line)
+   (forward-char 1)
+   (if (looking-at "\\*")
+       (let ((buffer-read-only nil))
+	 (delete-char 1)
+	 (insert ? )))))
+
+(defun Buffer-menu-execute ()
+  "Save and/or delete buffers marked with \\<Buffer-menu-mode-map>\\[Buffer-menu-save] or \\<Buffer-menu-mode-map>\\[Buffer-menu-delete] commands."
+  (interactive)
+  (save-excursion
+    (goto-char (point-min))
+    (forward-line 1)
+    (while (re-search-forward "^.S" nil t)
+      (let ((modp nil))
+	(save-excursion
+	  (set-buffer (Buffer-menu-buffer t))
+	  (save-buffer)
+	  (setq modp (buffer-modified-p)))
+	(let ((buffer-read-only nil))
+	  (delete-char -1)
+	  (insert (if modp ?* ? ))))))
+  (save-excursion
+    (goto-char (point-min))
+    (forward-line 1)
+    (let ((buff-menu-buffer (current-buffer))
+	  (buffer-read-only nil))
+      (while (search-forward "\nD" nil t)
+	(forward-char -1)
+	(let ((buf (Buffer-menu-buffer nil)))
+	  (or (eq buf nil)
+	      (eq buf buff-menu-buffer)
+	      (save-excursion (kill-buffer buf))))
+	(if (Buffer-menu-buffer nil)
+	    (progn (delete-char 1)
+		   (insert ? ))
+	  (delete-region (point) (progn (forward-line 1) (point)))
+ 	  (forward-char -1))))))
+
+(defun Buffer-menu-select ()
+  "Select this line's buffer; also display buffers marked with `>'.
+You can mark buffers with the \\<Buffer-menu-mode-map>\\[Buffer-menu-mark] command."
+  (interactive)
+  (let ((buff (Buffer-menu-buffer t))
+	(menu (current-buffer))	      
+	(others ())
+	tem)
+    (goto-char (point-min))
+    (while (search-forward "\n>" nil t)
+      (setq tem (Buffer-menu-buffer t))
+      (let ((buffer-read-only nil))
+	(delete-char -1)
+	(insert ?\ ))
+      (or (eq tem buff) (memq tem others) (setq others (cons tem others))))
+    (setq others (nreverse others)
+	  tem (/ (1- (screen-height)) (1+ (length others))))
+    (delete-other-windows)
+    (switch-to-buffer buff)
+    (or (eq menu buff)
+	(bury-buffer menu))
+    (while others
+      (split-window nil tem)
+      (other-window 1)
+      (switch-to-buffer (car others))
+      (setq others (cdr others)))
+    (other-window 1)))			;back to the beginning!
+
+(defun Buffer-menu-visit-tags-table ()
+  "Visit the tags table in the buffer on this line.  See `visit-tags-table'."
+  (interactive)
+  (let ((file (buffer-file-name (Buffer-menu-buffer t))))
+    (if file
+	(visit-tags-table file)
+      (error "Specified buffer has no file"))))
+
+(defun Buffer-menu-1-window ()
+  "Select this line's buffer, alone, in full screen."
+  (interactive)
+  (switch-to-buffer (Buffer-menu-buffer t))
+  (bury-buffer (other-buffer))
+  (delete-other-windows))
+
+(defun Buffer-menu-this-window ()
+  "Select this line's buffer in this window."
+  (interactive)
+  (switch-to-buffer (Buffer-menu-buffer t)))
+
+(defun Buffer-menu-other-window ()
+  "Select this line's buffer in other window, leaving buffer menu visible."
+  (interactive)
+  (switch-to-buffer-other-window (Buffer-menu-buffer t)))
+
+(defun Buffer-menu-2-window ()
+  "Select this line's buffer, with previous buffer in second window."
+  (interactive)
+  (let ((buff (Buffer-menu-buffer t))
+	(menu (current-buffer))
+	(pop-up-windows t))
+    (switch-to-buffer (other-buffer))
+    (pop-to-buffer buff)
+    (bury-buffer menu)))