lisp/ebuff-menu.el

   1 ;;; ebuff-menu.el --- electric-buffer-list mode
   2
   3 ;; Copyright (C) 1985, 1986, 1994, 2002, 2003, 2004,
   4 ;;   2005 Free Software Foundation, Inc.
   5
   6 ;; Author: Richard Mlynarik <mly@ai.mit.edu>
   7 ;; Maintainer: FSF
   8 ;; Keywords: convenience
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software; you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation; either version 2, or (at your option)
  15 ;; any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  24 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  25 ;; Boston, MA 02110-1301, USA.
  26
  27 ;;; Commentary:
  28
  29 ;; Who says one can't have typeout windows in GNU Emacs?   The entry
  30 ;; point, `electric-buffer-list' works like ^r select buffer from the
  31 ;; ITS Emacs lunar or tmacs libraries.
  32
  33 ;;; Code:
  34
  35 (require 'electric)
  36
  37 ;; this depends on the format of list-buffers (from src/buffer.c) and
  38 ;; on stuff in lisp/buff-menu.el
  39
  40 (defvar electric-buffer-menu-mode-map nil)
  41
  42 (defvar electric-buffer-menu-mode-hook nil
  43   "Normal hook run by `electric-buffer-list'.")
  44
  45 ;;;###autoload
  46 (defun electric-buffer-list (arg)
  47   "Pop up a buffer describing the set of Emacs buffers.
  48 Vaguely like ITS lunar select buffer; combining typeoutoid buffer
  49 listing with menuoid buffer selection.
  50
  51 If the very next character typed is a space then the buffer list
  52 window disappears.  Otherwise, one may move around in the buffer list
  53 window, marking buffers to be selected, saved or deleted.
  54
  55 To exit and select a new buffer, type a space when the cursor is on
  56 the appropriate line of the buffer-list window.  Other commands are
  57 much like those of `Buffer-menu-mode'.
  58
  59 Run hooks in `electric-buffer-menu-mode-hook' on entry.
  60
  61 \\{electric-buffer-menu-mode-map}"
  62   (interactive "P")
  63   (let (select buffer)
  64     (save-window-excursion
  65       (setq buffer (list-buffers-noselect arg))
  66       (Electric-pop-up-window buffer)
  67       (unwind-protect
  68           (progn
  69             (set-buffer buffer)
  70             (Electric-buffer-menu-mode)
  71             (electric-buffer-update-highlight)
  72             (setq select
  73                   (catch 'electric-buffer-menu-select
  74                     (message "<<< Press Return to bury the buffer list >>>")
  75                     (if (eq (setq unread-command-events (list (read-event)))
  76                             ?\ )
  77                         (progn (setq unread-command-events nil)
  78                                (throw 'electric-buffer-menu-select nil)))
  79                     (let ((start-point (point))
  80                           (first (progn (goto-char (point-min))
  81                                         (unless Buffer-menu-use-header-line
  82                                           (forward-line 2))
  83                                         (point)))
  84                           (last (progn (goto-char (point-max))
  85                                        (forward-line -1)
  86                                        (point)))
  87                           (goal-column 0))
  88                       ;; Use start-point if it is meaningful.
  89                       (goto-char (if (or (< start-point first)
  90                                          (> start-point last))
  91                                      first
  92                                    start-point))
  93                       (Electric-command-loop 'electric-buffer-menu-select
  94                                              nil
  95                                              t
  96                                              'electric-buffer-menu-looper
  97                                              (cons first last))))))
  98         (set-buffer buffer)
  99         (Buffer-menu-mode)
 100         (bury-buffer buffer)
 101         (message "")))
 102     (if select
 103         (progn (set-buffer buffer)
 104                (let ((opoint (point-marker)))
 105                  (Buffer-menu-execute)
 106                  (goto-char (point-min))
 107                  (if (prog1 (search-forward "\n>" nil t)
 108                        (goto-char opoint) (set-marker opoint nil))
 109                      (Buffer-menu-select)
 110                      (switch-to-buffer (Buffer-menu-buffer t))))))))
 111
 112 (defun electric-buffer-menu-looper (state condition)
 113   (cond ((and condition
 114               (not (memq (car condition) '(buffer-read-only
 115                                            end-of-buffer
 116                                            beginning-of-buffer))))
 117          (signal (car condition) (cdr condition)))
 118         ((< (point) (car state))
 119          (goto-char (point-min))
 120          (unless Buffer-menu-use-header-line
 121            (forward-line 2)))
 122         ((> (point) (cdr state))
 123          (goto-char (point-max))
 124          (forward-line -1)
 125          (if (pos-visible-in-window-p (point-max))
 126              (recenter -1))))
 127   (electric-buffer-update-highlight))
 128
 129 (defvar Helper-return-blurb)
 130
 131 (put 'Electric-buffer-menu-mode 'mode-class 'special)
 132 (defun Electric-buffer-menu-mode ()
 133   "Major mode for editing a list of buffers.
 134 Each line describes one of the buffers in Emacs.
 135 Letters do not insert themselves; instead, they are commands.
 136 \\<electric-buffer-menu-mode-map>
 137 \\[keyboard-quit] or \\[Electric-buffer-menu-quit] -- exit buffer menu, returning to previous window and buffer
 138   configuration.  If the very first character typed is a space, it
 139   also has this effect.
 140 \\[Electric-buffer-menu-select] -- select buffer of line point is on.
 141   Also show buffers marked with m in other windows,
 142   deletes buffers marked with \"D\", and saves those marked with \"S\".
 143 \\[Buffer-menu-mark] -- mark buffer to be displayed.
 144 \\[Buffer-menu-not-modified] -- clear modified-flag on that buffer.
 145 \\[Buffer-menu-save] -- mark that buffer to be saved.
 146 \\[Buffer-menu-delete] or \\[Buffer-menu-delete-backwards] -- mark that buffer to be deleted.
 147 \\[Buffer-menu-unmark] -- remove all kinds of marks from current line.
 148 \\[Electric-buffer-menu-mode-view-buffer] -- view buffer, returning when done.
 149 \\[Buffer-menu-backup-unmark] -- back up a line and remove marks.
 150
 151 \\{electric-buffer-menu-mode-map}
 152
 153 Entry to this mode via command `electric-buffer-list' calls the value of
 154 `electric-buffer-menu-mode-hook'."
 155   (let ((saved header-line-format))
 156     (kill-all-local-variables)
 157     (setq header-line-format saved))
 158   (use-local-map electric-buffer-menu-mode-map)
 159   (setq mode-name "Electric Buffer Menu")
 160   (setq mode-line-buffer-identification "Electric Buffer List")
 161   (make-local-variable 'Helper-return-blurb)
 162   (setq Helper-return-blurb "return to buffer editing")
 163   (setq truncate-lines t)
 164   (setq buffer-read-only t)
 165   (setq major-mode 'Electric-buffer-menu-mode)
 166   (goto-char (point-min))
 167   (if (search-forward "\n." nil t) (forward-char -1))
 168   (run-mode-hooks 'electric-buffer-menu-mode-hook))
 169
 170 ;; generally the same as Buffer-menu-mode-map
 171 ;;  (except we don't indirect to global-map)
 172 (put 'Electric-buffer-menu-undefined 'suppress-keymap t)
 173 (if electric-buffer-menu-mode-map
 174     nil
 175   (let ((map (make-keymap)))
 176     (fillarray (car (cdr map)) 'Electric-buffer-menu-undefined)
 177     (define-key map "\e" nil)
 178     (define-key map "\C-z" 'suspend-emacs)
 179     (define-key map "v" 'Electric-buffer-menu-mode-view-buffer)
 180     (define-key map (char-to-string help-char) 'Helper-help)
 181     (define-key map "?" 'Helper-describe-bindings)
 182     (define-key map "\C-c" nil)
 183     (define-key map "\C-c\C-c" 'Electric-buffer-menu-quit)
 184     (define-key map "\C-]" 'Electric-buffer-menu-quit)
 185     (define-key map "q" 'Electric-buffer-menu-quit)
 186     (define-key map " " 'Electric-buffer-menu-select)
 187     (define-key map "\C-m" 'Electric-buffer-menu-select)
 188     (define-key map "\C-l" 'recenter)
 189     (define-key map "s" 'Buffer-menu-save)
 190     (define-key map "d" 'Buffer-menu-delete)
 191     (define-key map "k" 'Buffer-menu-delete)
 192     (define-key map "\C-d" 'Buffer-menu-delete-backwards)
 193     ;(define-key map "\C-k" 'Buffer-menu-delete)
 194     (define-key map "\177" 'Buffer-menu-backup-unmark)
 195     (define-key map "~" 'Buffer-menu-not-modified)
 196     (define-key map "u" 'Buffer-menu-unmark)
 197     (let ((i ?0))
 198       (while (<= i ?9)
 199         (define-key map (char-to-string i) 'digit-argument)
 200         (define-key map (concat "\e" (char-to-string i)) 'digit-argument)
 201         (setq i (1+ i))))
 202     (define-key map "-" 'negative-argument)
 203     (define-key map "\e-" 'negative-argument)
 204     (define-key map "m" 'Buffer-menu-mark)
 205     (define-key map "\C-u" 'universal-argument)
 206     (define-key map "\C-p" 'previous-line)
 207     (define-key map "\C-n" 'next-line)
 208     (define-key map "p" 'previous-line)
 209     (define-key map "n" 'next-line)
 210     (define-key map "\C-v" 'scroll-up)
 211     (define-key map "\ev" 'scroll-down)
 212     (define-key map ">" 'scroll-right)
 213     (define-key map "<" 'scroll-left)
 214     (define-key map "\e\C-v" 'scroll-other-window)
 215     (define-key map "\e>" 'end-of-buffer)
 216     (define-key map "\e<" 'beginning-of-buffer)
 217     (define-key map "\e\e" nil)
 218     (define-key map "\e\e\e" 'Electric-buffer-menu-quit)
 219     (define-key map [escape escape escape] 'Electric-buffer-menu-quit)
 220     (define-key map [mouse-2] 'Electric-buffer-menu-mouse-select)
 221     (setq electric-buffer-menu-mode-map map)))
 222
 223 (defun Electric-buffer-menu-exit ()
 224   (interactive)
 225   (setq unread-command-events (listify-key-sequence (this-command-keys)))
 226   ;; for robustness
 227   (condition-case ()
 228       (throw 'electric-buffer-menu-select nil)
 229     (error (Buffer-menu-mode)
 230            (other-buffer))))
 231
 232 (defun Electric-buffer-menu-select ()
 233   "Leave Electric Buffer Menu, selecting buffers and executing changes.
 234 Save buffers marked \"S\".  Delete buffers marked \"K\".
 235 Select buffer at point and display buffers marked \">\" in other windows."
 236   (interactive)
 237   (throw 'electric-buffer-menu-select (point)))
 238
 239 (defun Electric-buffer-menu-mouse-select (event)
 240   (interactive "e")
 241   (select-window (posn-window (event-end event)))
 242   (set-buffer (window-buffer (selected-window)))
 243   (goto-char (posn-point (event-end event)))
 244   (throw 'electric-buffer-menu-select (point)))
 245
 246 (defun Electric-buffer-menu-quit ()
 247   "Leave Electric Buffer Menu, restoring previous window configuration.
 248 Skip execution of select, save, and delete commands."
 249   (interactive)
 250   (throw 'electric-buffer-menu-select nil))
 251
 252 (defun Electric-buffer-menu-undefined ()
 253   (interactive)
 254   (ding)
 255   (message "%s"
 256            (if (and (eq (key-binding "\C-c\C-c") 'Electric-buffer-menu-quit)
 257                     (eq (key-binding " ") 'Electric-buffer-menu-select)
 258                     (eq (key-binding (char-to-string help-char)) 'Helper-help)
 259                     (eq (key-binding "?") 'Helper-describe-bindings))
 260                (substitute-command-keys "Type C-c C-c to exit, Space to select, \\[Helper-help] for help, ? for commands")
 261              (substitute-command-keys "\
 262 Type \\[Electric-buffer-menu-quit] to exit, \
 263 \\[Electric-buffer-menu-select] to select, \
 264 \\[Helper-help] for help, \\[Helper-describe-bindings] for commands.")))
 265   (sit-for 4))
 266
 267 (defun Electric-buffer-menu-mode-view-buffer ()
 268   "View buffer on current line in Electric Buffer Menu.
 269 Return to Electric Buffer Menu when done."
 270   (interactive)
 271   (let ((bufnam (Buffer-menu-buffer nil)))
 272     (if bufnam
 273         (view-buffer bufnam)
 274       (ding)
 275       (message "Buffer %s does not exist!" bufnam)
 276       (sit-for 4))))
 277
 278 (defvar electric-buffer-overlay nil)
 279 (defun electric-buffer-update-highlight ()
 280   (when (eq major-mode 'Electric-buffer-menu-mode)
 281     ;; Make sure we have an overlay to use.
 282     (or electric-buffer-overlay
 283         (progn
 284           (make-local-variable 'electric-buffer-overlay)
 285           (setq electric-buffer-overlay (make-overlay (point) (point)))))
 286     (move-overlay electric-buffer-overlay
 287                   (save-excursion (beginning-of-line) (point))
 288                   (save-excursion (end-of-line) (point)))
 289     (overlay-put electric-buffer-overlay 'face 'highlight)))
 290
 291 (provide 'ebuff-menu)
 292
 293 ;;; arch-tag: 1d4509b3-eece-4d4f-95ea-77c83eaf0275
 294 ;;; ebuff-menu.el ends here