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588c722f22
emacs/lisp/buff-menu.el
Eli Zaretskii ae83015970 (list-buffers-noselect): If the buffer's name 
starts with a blank, but it visits a file, do show it (for files
whose names start with a blank).
2001-10-30 10:44:17 +00:00

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;;; buff-menu.el --- buffer menu main function and support functions
;; Copyright (C) 1985, 86, 87, 93, 94, 95, 2000, 2001
;; Free Software Foundation, Inc.
;; Maintainer: FSF
;; Keywords: convenience
;; 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 2, 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, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;; Edit, delete, or change attributes of all currently active Emacs
;; buffers from a list summarizing their state. A good way to browse
;; any special or scratch buffers you have loaded, since you can't find
;; them by filename. The single entry point is `list-buffers',
;; normally bound to C-x C-b.
;;; Change Log:
;; Buffer-menu-view: New function
;; Buffer-menu-view-other-window: New function
;; Merged by esr with recent mods to Emacs 19 buff-menu, 23 Mar 1993
;;
;; 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.
;;
;; Based on FSF code dating back to 1985.
;;; Code:
;;;Trying to preserve the old window configuration works well in
;;;simple scenarios, when you enter the buffer menu, use it, and exit it.
;;;But it does strange things when you switch back to the buffer list buffer
;;;with C-x b, later on, when the window configuration is different.
;;;The choice seems to be, either restore the window configuration
;;;in all cases, or in no cases.
;;;I decided it was better not to restore the window config at all. -- rms.
;;;But since then, I changed buffer-menu to use the selected window,
;;;so q now once again goes back to the previous window configuration.
;;;(defvar Buffer-menu-window-config nil
;;; "Window configuration saved from entry to `buffer-menu'.")
; 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-buffer-column nil)
(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" 'quit-window)
(define-key Buffer-menu-mode-map "v" '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 "e" 'Buffer-menu-this-window)
(define-key Buffer-menu-mode-map "\C-m" 'Buffer-menu-this-window)
(define-key Buffer-menu-mode-map "o" 'Buffer-menu-other-window)
(define-key Buffer-menu-mode-map "\C-o" 'Buffer-menu-switch-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)
(define-key Buffer-menu-mode-map "%" 'Buffer-menu-toggle-read-only)
(define-key Buffer-menu-mode-map "b" 'Buffer-menu-bury)
(define-key Buffer-menu-mode-map "g" 'Buffer-menu-revert)
(define-key Buffer-menu-mode-map "V" 'Buffer-menu-view)
(define-key Buffer-menu-mode-map [mouse-2] 'Buffer-menu-mouse-select)
)
;; 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-mouse-select] -- select buffer you click on, in place of the buffer menu.
\\[Buffer-menu-this-window] -- select current line's buffer in place of the buffer menu.
\\[Buffer-menu-other-window] -- select that buffer in another window,
so the buffer menu buffer remains visible in its window.
\\[Buffer-menu-view] -- select current line's buffer, but in view-mode.
\\[Buffer-menu-view-other-window] -- select that buffer in
another window, in view-mode.
\\[Buffer-menu-switch-other-window] -- make another window display that buffer.
\\[Buffer-menu-mark] -- mark current line's buffer to be displayed.
\\[Buffer-menu-select] -- select current line's buffer.
Also show buffers marked with m, in other windows.
\\[Buffer-menu-1-window] -- select that buffer in full-frame window.
\\[Buffer-menu-2-window] -- select that buffer in one window,
together with buffer selected before this one in another 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.
With prefix argument, also move up one line.
\\[Buffer-menu-backup-unmark] -- back up a line and remove marks.
\\[Buffer-menu-toggle-read-only] -- toggle read-only status of buffer on this line.
\\[Buffer-menu-revert] -- update the list of buffers.
\\[Buffer-menu-bury] -- bury the buffer listed on this line."
(kill-all-local-variables)
(use-local-map Buffer-menu-mode-map)
(setq major-mode 'Buffer-menu-mode)
(setq mode-name "Buffer Menu")
(make-local-variable 'revert-buffer-function)
(setq revert-buffer-function 'Buffer-menu-revert-function)
(setq truncate-lines t)
(setq buffer-read-only t)
(run-hooks 'buffer-menu-mode-hook))
(defun Buffer-menu-revert ()
"Update the list of buffers."
(interactive)
(revert-buffer))
(defun Buffer-menu-revert-function (ignore1 ignore2)
(list-buffers))
(defun Buffer-menu-buffer (error-if-non-existent-p)
"Return buffer described by this line of buffer menu."
(let* ((where (save-excursion
(beginning-of-line)
(+ (point) Buffer-menu-buffer-column)))
(name (and (not (eobp)) (get-text-property where 'buffer-name)))
(buf (and (not (eobp)) (get-text-property where 'buffer))))
(if name
(or (get-buffer name)
(and buf (buffer-name buf) buf)
(if error-if-non-existent-p
(error "No buffer named `%s'" name)
nil))
(or (and buf (buffer-name buf) buf)
(if error-if-non-existent-p
(error "No buffer on this line")
nil)))))
(defun buffer-menu (&optional 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")
;;; (setq Buffer-menu-window-config (current-window-configuration))
(switch-to-buffer (list-buffers-noselect arg))
(message
"Commands: d, s, x, u; f, o, 1, 2, m, v; ~, %%; q to quit; ? for help."))
(defun buffer-menu-other-window (&optional arg)
"Display a list of buffers in another window.
With the buffer list buffer, you can save, delete or select the buffers.
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")
;;; (setq Buffer-menu-window-config (current-window-configuration))
(switch-to-buffer-other-window (list-buffers-noselect arg))
(message
"Commands: d, s, x, u; f, o, 1, 2, m, v; ~, %%; q to quit; ? 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 (&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 (&optional arg)
"Mark buffer on this line to be deleted by \\<Buffer-menu-mode-map>\\[Buffer-menu-execute] command.
Prefix arg is how many buffers to delete.
Negative arg means delete backwards."
(interactive "p")
(beginning-of-line)
(if (looking-at " [-M]") ;header lines
(ding)
(let ((buffer-read-only nil))
(if (or (null arg) (= arg 0))
(setq arg 1))
(while (> arg 0)
(delete-char 1)
(insert ?D)
(forward-line 1)
(setq arg (1- arg)))
(while (< arg 0)
(delete-char 1)
(insert ?D)
(forward-line -1)
(setq arg (1+ arg))))))
(defun Buffer-menu-delete-backwards (&optional arg)
"Mark buffer on this line to be deleted by \\<Buffer-menu-mode-map>\\[Buffer-menu-execute] command
and then move up one line. Prefix arg means move that many lines."
(interactive "p")
(Buffer-menu-delete (- (or arg 1)))
(while (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)
(if (looking-at " [-M]") ;header lines
(ding)
(let ((buffer-read-only nil))
(forward-char 1)
(delete-char 1)
(insert ?S)
(forward-line 1))))
(defun Buffer-menu-not-modified (&optional arg)
"Mark buffer on this line as unmodified (no changes to save)."
(interactive "P")
(save-excursion
(set-buffer (Buffer-menu-buffer t))
(set-buffer-modified-p arg))
(save-excursion
(beginning-of-line)
(forward-char 1)
(if (= (char-after (point)) (if arg ? ?*))
(let ((buffer-read-only nil))
(delete-char 1)
(insert (if arg ?* ? ))))))
(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 (and buf (buffer-name buf))
(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.
This command deletes and replaces all the previously existing windows
in the selected frame."
(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- (frame-height)) (1+ (length others))))
(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 Buffer-menu-window-config
;;; (progn
;;; (set-window-configuration Buffer-menu-window-config)
;;; (setq Buffer-menu-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-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 frame."
(interactive)
(switch-to-buffer (Buffer-menu-buffer t))
(bury-buffer (other-buffer))
(delete-other-windows))
(defun Buffer-menu-mouse-select (event)
"Select the buffer whose line you click on."
(interactive "e")
(let (buffer)
(save-excursion
(set-buffer (window-buffer (posn-window (event-end event))))
(save-excursion
(goto-char (posn-point (event-end event)))
(setq buffer (Buffer-menu-buffer t))))
(select-window (posn-window (event-end event)))
(if (and (window-dedicated-p (selected-window))
(eq (selected-window) (frame-root-window)))
(switch-to-buffer-other-frame buffer)
(switch-to-buffer buffer))))
(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-switch-other-window ()
"Make the other window select this line's buffer.
The current window remains selected."
(interactive)
(display-buffer (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)))
(defun Buffer-menu-toggle-read-only ()
"Toggle read-only status of buffer on this line, perhaps via version control."
(interactive)
(let (char)
(save-excursion
(set-buffer (Buffer-menu-buffer t))
(vc-toggle-read-only)
(setq char (if buffer-read-only ?% ? )))
(save-excursion
(beginning-of-line)
(forward-char 2)
(if (/= (following-char) char)
(let (buffer-read-only)
(delete-char 1)
(insert char))))))
(defun Buffer-menu-bury ()
"Bury the buffer listed on this line."
(interactive)
(beginning-of-line)
(if (looking-at " [-M]") ;header lines
(ding)
(save-excursion
(beginning-of-line)
(bury-buffer (Buffer-menu-buffer t))
(let ((line (buffer-substring (point) (progn (forward-line 1) (point))))
(buffer-read-only nil))
(delete-region (point) (progn (forward-line -1) (point)))
(goto-char (point-max))
(insert line))
(message "Buried buffer moved to the end"))))
(defun Buffer-menu-view ()
"View this line's buffer in View mode."
(interactive)
(view-buffer (Buffer-menu-buffer t)))
(defun Buffer-menu-view-other-window ()
"View this line's buffer in View mode in another window."
(interactive)
(view-buffer-other-window (Buffer-menu-buffer t)))
(define-key ctl-x-map "\C-b" 'list-buffers)
(defun list-buffers (&optional files-only)
"Display a list of names of existing buffers.
The list is displayed in a buffer named `*Buffer List*'.
Note that buffers with names starting with spaces are omitted.
Non-null optional arg FILES-ONLY means mention only file buffers.
The M column contains a * for buffers that are modified.
The R column contains a % for buffers that are read-only."
(interactive "P")
(display-buffer (list-buffers-noselect files-only)))
(defun list-buffers-noselect (&optional files-only)
"Create and return a buffer with a list of names of existing buffers.
The buffer is named `*Buffer List*'.
Note that buffers with names starting with spaces are omitted.
Non-null optional arg FILES-ONLY means mention only file buffers.
The M column contains a * for buffers that are modified.
The R column contains a % for buffers that are read-only."
(let ((old-buffer (current-buffer))
(standard-output standard-output)
desired-point)
(save-excursion
(set-buffer (get-buffer-create "*Buffer List*"))
(setq buffer-read-only nil)
(erase-buffer)
(setq standard-output (current-buffer))
(princ "\
MR Buffer Size Mode File
-- ------ ---- ---- ----
")
;; Record the column where buffer names start.
(setq Buffer-menu-buffer-column 4)
(dolist (buffer (buffer-list))
(let ((name (buffer-name buffer))
(file (buffer-file-name buffer))
this-buffer-line-start
this-buffer-read-only
(this-buffer-size (buffer-size buffer))
this-buffer-mode-name
this-buffer-directory)
(with-current-buffer buffer
(setq this-buffer-read-only buffer-read-only
this-buffer-mode-name mode-name)
(unless file
;; No visited file. Check local value of
;; list-buffers-directory.
(when (and (boundp 'list-buffers-directory)
list-buffers-directory)
(setq this-buffer-directory list-buffers-directory))))
(cond
;; Don't mention internal buffers.
((and (string= (substring name 0 1) " ") (null file)))
;; Maybe don't mention buffers without files.
((and files-only (not file)))
((string= name "*Buffer List*"))
;; Otherwise output info.
(t
(setq this-buffer-line-start (point))
;; Identify current buffer.
(if (eq buffer old-buffer)
(progn
(setq desired-point (point))
(princ "."))
(princ " "))
;; Identify modified buffers.
(princ (if (buffer-modified-p buffer) "*" " "))
;; Handle readonly status. The output buffer is special
;; cased to appear readonly; it is actually made so at a
;; later date.
(princ (if (or (eq buffer standard-output)
this-buffer-read-only)
"% "
" "))
(princ name)
;; Put the buffer name into a text property
;; so we don't have to extract it from the text.
;; This way we avoid problems with unusual buffer names.
(setq this-buffer-line-start
(+ this-buffer-line-start Buffer-menu-buffer-column))
(let ((name-end (point)))
(indent-to 17 2)
(put-text-property this-buffer-line-start name-end
'buffer-name name)
(put-text-property this-buffer-line-start (point)
'buffer buffer)
(put-text-property this-buffer-line-start name-end
'mouse-face 'highlight)
(put-text-property this-buffer-line-start name-end
'help-echo "mouse-2: select this buffer"))
(let ((size (format "%8d" this-buffer-size))
(mode this-buffer-mode-name)
(excess (- (current-column) 17)))
(while (and (> excess 0) (= (aref size 0) ?\ ))
(setq size (substring size 1)
excess (1- excess)))
(princ size)
(indent-to 27 1)
(princ mode))
(indent-to 40 1)
(or file (setq file this-buffer-directory))
(when file
(princ (abbreviate-file-name file)))
(princ "\n")))))
(Buffer-menu-mode)
;; DESIRED-POINT doesn't have to be set; it is not when the
;; current buffer is not displayed for some reason.
(and desired-point
(goto-char desired-point))
(current-buffer))))
;;; buff-menu.el ends here
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