weiner@novavax.UUCP (Bob Weiner) (04/28/89)
;; Buffer menu main function and support functions.
;; Copyright (C) 1985, 1986, 1987 Free Software Foundation, Inc.
;;
;; Modified by Bob Weiner, Motorola, Inc., 3/1/89
;;
;; Save window configuration when 'buffer-menu' is called so that
;; previous window configuration is restored. prior to selecting
;; buffers.
;; Made 'Buffer-menu-select' also perform a 'Buffer-menu-execute'.
;;
;; Modified by Bob Weiner, Motorola, Inc., 4/14/89
;;
;; Added optional backup argument to 'Buffer-menu-unmark' to make it undelete
;; current entry and then move to previous one.
;; This file is part of GNU Emacs.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY. No author or distributor
;; accepts responsibility to anyone for the consequences of using it
;; or for whether it serves any particular purpose or works at all,
;; unless he says so in writing. Refer to the GNU Emacs General Public
;; License for full details.
;; Everyone is granted permission to copy, modify and redistribute
;; GNU Emacs, but only under the conditions described in the
;; GNU Emacs General Public License. A copy of this license is
;; supposed to have been given to you along with GNU Emacs so you
;; can know your rights and responsibilities. It should be in a
;; file named COPYING. Among other things, the copyright notice
;; and this notice must be preserved on all copies.
(defvar *buff-window-config* nil
"Stores window configuration upon entry of 'buffer-menu'. Used to
restore window configuration when only one buffer is selected.")
; 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 "\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))
;; 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.
m -- mark buffer to be displayed.
q -- select buffer of line point is on.
Also show buffers marked with m in other windows.
1 -- select that buffer in full-screen window.
2 -- select that buffer in one window,
together with buffer selected before this one in another window.
f -- select that buffer in place of the buffer menu buffer.
o -- select that buffer in another window,
so the buffer menu buffer remains visible in its window.
~ -- clear modified-flag on that buffer.
s -- mark that buffer to be saved, and move down.
C-d -- mark that buffer to be deleted, and move up.
x -- delete or save marked buffers.
u -- remove all kinds of marks from current line.
Precisely,\\{Buffer-menu-mode-map}"
(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 nil)
(defvar Buffer-menu-size-column nil)
(defun Buffer-menu-buffer (error-if-non-existent-p)
"Return buffer described by this line of buffer menu."
(if (null Buffer-menu-buffer-column)
(save-excursion
(goto-char (point-min))
(search-forward "Buffer")
(backward-word 1)
(setq Buffer-menu-buffer-column (current-column))
(search-forward "Size")
(backward-word 1)
(setq Buffer-menu-size-column (current-column))))
(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 and to restore
previous window configuration."
(interactive "P")
(setq *buff-window-config* (current-window-configuration))
(list-buffers arg)
(pop-to-buffer "*Buffer List*")
(forward-line 2)
(message
"Commands: d, s, x; 1, 2, m, u; delete; ~; q to quit; ? for help."))
(defun Buffer-menu-mark ()
"Mark buffer on this line for being displayed by \\[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 (&optional backup)
"Cancel all requested operations on buffer on this line and move down.
Optional ARG means move up."
(interactive "P")
(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 (if backup -1 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-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-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-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-save] or \\[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-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))))
(Buffer-menu-execute)
(delete-other-windows)
(switch-to-buffer buff)
(or (eq menu buff)
(bury-buffer menu))
(if (equal (length others) 0)
(progn
;; Restore previous window configuration before displaying
;; selected buffers.
(if *buff-window-config*
(progn
(set-window-configuration *buff-window-config*)
(setq *buff-window-config* nil)))
(switch-to-buffer buff))
(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-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))
(delete-other-windows)
(switch-to-buffer (other-buffer))
(pop-to-buffer buff)
(bury-buffer menu)))
--
Bob Weiner, Motorola, Inc., USENET: ...!gatech!uflorida!novavax!weiner
(407) 738-2087