lisp/ebuff-menu.el

   1 ;;; ebuff-menu.el --- electric-buffer-list mode
   2
   3 ;; Copyright (C) 1985-1986, 1994, 2001-2012  Free Software Foundation, Inc.
   4
   5 ;; Author: Richard Mlynarik <mly@ai.mit.edu>
   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 of the License, or
  14 ;; (at your option) 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.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;; Who says one can't have typeout windows in GNU Emacs?   The entry
  27 ;; point, `electric-buffer-list' works like ^r select buffer from the
  28 ;; ITS Emacs lunar or tmacs libraries.
  29
  30 ;;; Code:
  31
  32 (require 'electric)
  33
  34 (defvar electric-buffer-menu-mode-map
  35   (let ((map (make-keymap)))
  36     (fillarray (car (cdr map)) 'Electric-buffer-menu-undefined)
  37     (define-key map "\e" nil)
  38     (define-key map "\C-z" 'suspend-frame)
  39     (define-key map "v" 'Electric-buffer-menu-mode-view-buffer)
  40     (define-key map (char-to-string help-char) 'Helper-help)
  41     (define-key map "?" 'Helper-describe-bindings)
  42     (define-key map "\C-c" nil)
  43     (define-key map "\C-c\C-c" 'Electric-buffer-menu-quit)
  44     (define-key map "\C-]" 'Electric-buffer-menu-quit)
  45     (define-key map "q" 'Electric-buffer-menu-quit)
  46     (define-key map " " 'Electric-buffer-menu-select)
  47     (define-key map "\C-m" 'Electric-buffer-menu-select)
  48     (define-key map "\C-l" 'recenter)
  49     (define-key map "s" 'Buffer-menu-save)
  50     (define-key map "d" 'Buffer-menu-delete)
  51     (define-key map "k" 'Buffer-menu-delete)
  52     (define-key map "\C-d" 'Buffer-menu-delete-backwards)
  53     ;; (define-key map "\C-k" 'Buffer-menu-delete)
  54     (define-key map "\177" 'Buffer-menu-backup-unmark)
  55     (define-key map "~" 'Buffer-menu-not-modified)
  56     (define-key map "u" 'Buffer-menu-unmark)
  57     (let ((i ?0))
  58       (while (<= i ?9)
  59         (define-key map (char-to-string i) 'digit-argument)
  60         (define-key map (concat "\e" (char-to-string i)) 'digit-argument)
  61         (setq i (1+ i))))
  62     (define-key map "-" 'negative-argument)
  63     (define-key map "\e-" 'negative-argument)
  64     (define-key map "m" 'Buffer-menu-mark)
  65     (define-key map "\C-u" 'universal-argument)
  66     (define-key map "\C-p" 'previous-line)
  67     (define-key map "\C-n" 'next-line)
  68     (define-key map "p" 'previous-line)
  69     (define-key map "n" 'next-line)
  70     (define-key map "\C-v" 'scroll-up-command)
  71     (define-key map "\ev" 'scroll-down-command)
  72     (define-key map ">" 'scroll-right)
  73     (define-key map "<" 'scroll-left)
  74     (define-key map "\e\C-v" 'scroll-other-window)
  75     (define-key map "\e>" 'end-of-buffer)
  76     (define-key map "\e<" 'beginning-of-buffer)
  77     (define-key map "\e\e" nil)
  78     (define-key map "\e\e\e" 'Electric-buffer-menu-quit)
  79     ;; This binding prevents the "escape => ESC" function-key-map mapping from
  80     ;; kicking in!
  81     ;; (define-key map [escape escape escape] 'Electric-buffer-menu-quit)
  82     (define-key map [mouse-2] 'Electric-buffer-menu-mouse-select)
  83     map))
  84
  85 (put 'Electric-buffer-menu-quit :advertised-binding "\C-c\C-c")
  86 (put 'Electric-buffer-menu-select :advertised-binding " ")
  87 (put 'Helper-help :advertised-binding (char-to-string help-char))
  88 (put 'Helper-describe-bindings :advertised-binding "?")
  89
  90 (defvar electric-buffer-menu-mode-hook nil
  91   "Normal hook run by `electric-buffer-menu-mode'.")
  92
  93 ;;;###autoload
  94 (defun electric-buffer-list (arg)
  95   "Pop up the Buffer Menu in an \"electric\" window.
  96 If you type SPC or RET (`Electric-buffer-menu-select'), that
  97 selects the buffer at point and quits the \"electric\" window.
  98 Otherwise, you can move around in the Buffer Menu, marking
  99 buffers to be selected, saved or deleted; these other commands
 100 are much like those of `Buffer-menu-mode'.
 101
 102 Run hooks in `electric-buffer-menu-mode-hook' on entry.
 103
 104 \\<electric-buffer-menu-mode-map>
 105 \\[keyboard-quit] or \\[Electric-buffer-menu-quit] -- exit buffer menu, returning to previous window and buffer
 106   configuration.  If the very first character typed is a space, it
 107   also has this effect.
 108 \\[Electric-buffer-menu-select] -- select buffer of line point is on.
 109   Also show buffers marked with m in other windows,
 110   deletes buffers marked with \"D\", and saves those marked with \"S\".
 111 \\[Buffer-menu-mark] -- mark buffer to be displayed.
 112 \\[Buffer-menu-not-modified] -- clear modified-flag on that buffer.
 113 \\[Buffer-menu-save] -- mark that buffer to be saved.
 114 \\[Buffer-menu-delete] or \\[Buffer-menu-delete-backwards] -- mark that buffer to be deleted.
 115 \\[Buffer-menu-unmark] -- remove all kinds of marks from current line.
 116 \\[Electric-buffer-menu-mode-view-buffer] -- view buffer, returning when done.
 117 \\[Buffer-menu-backup-unmark] -- back up a line and remove marks."
 118   (interactive "P")
 119   (let (select buffer)
 120     (save-window-excursion
 121       (setq buffer (list-buffers-noselect arg))
 122       (Electric-pop-up-window buffer)
 123       (unwind-protect
 124           (progn
 125             (set-buffer buffer)
 126             (electric-buffer-menu-mode)
 127             (goto-char (point-min))
 128             (if (search-forward "\n." nil t)
 129                 (forward-char -1))
 130             (electric-buffer-update-highlight)
 131             (setq select
 132                   (catch 'electric-buffer-menu-select
 133                     (message "<<< Type SPC or RET to bury the buffer list >>>")
 134                     (setq unread-command-events (list (read-event)))
 135                     (let ((start-point (point))
 136                           (first (progn (goto-char (point-min))
 137                                         (unless Buffer-menu-use-header-line
 138                                           (forward-line 2))
 139                                         (point)))
 140                           (last (progn (goto-char (point-max))
 141                                        (forward-line -1)
 142                                        (point)))
 143                           (goal-column 0))
 144                       ;; Use start-point if it is meaningful.
 145                       (goto-char (if (or (< start-point first)
 146                                          (> start-point last))
 147                                      first
 148                                    start-point))
 149                       (Electric-command-loop 'electric-buffer-menu-select
 150                                              nil
 151                                              t
 152                                              'electric-buffer-menu-looper
 153                                              (cons first last))))))
 154         (set-buffer buffer)
 155         (Buffer-menu-mode)
 156         (bury-buffer)                ;Get rid of window, if dedicated.
 157         (message "")))
 158     (when select
 159       (set-buffer buffer)
 160       (let ((opoint (point-marker)))
 161         (Buffer-menu-execute)
 162         (goto-char (point-min))
 163         (if (prog1 (search-forward "\n>" nil t)
 164               (goto-char opoint)
 165               (set-marker opoint nil))
 166             (Buffer-menu-select)
 167           (switch-to-buffer (Buffer-menu-buffer t)))))))
 168
 169 (defun electric-buffer-menu-looper (state condition)
 170   (cond ((and condition
 171               (not (memq (car condition) '(buffer-read-only
 172                                            end-of-buffer
 173                                            beginning-of-buffer))))
 174          (signal (car condition) (cdr condition)))
 175         ((< (point) (car state))
 176          (goto-char (point-min))
 177          (unless Buffer-menu-use-header-line
 178            (forward-line 2)))
 179         ((> (point) (cdr state))
 180          (goto-char (point-max))
 181          (forward-line -1)
 182          (if (pos-visible-in-window-p (point-max))
 183              (recenter -1))))
 184   (electric-buffer-update-highlight))
 185
 186 (defvar Helper-return-blurb)
 187
 188 (define-derived-mode electric-buffer-menu-mode Buffer-menu-mode
 189   "Electric Buffer Menu"
 190   "Toggle Electric Buffer Menu mode in this buffer.
 191 With a prefix argument ARG, enable Long Lines mode if ARG is
 192 positive, and disable it otherwise.  If called from Lisp, enable
 193 the mode if ARG is omitted or nil.
 194
 195 Electric Buffer Menu mode is a minor mode which is automatically
 196 enabled and disabled by the \\[electric-buffer-list] command.
 197 See the documentation of `electric-buffer-list' for details."
 198   (setq mode-line-buffer-identification "Electric Buffer List")
 199   (set (make-local-variable 'Helper-return-blurb)
 200        "return to buffer editing"))
 201
 202 (define-obsolete-function-alias 'Electric-buffer-menu-mode
 203   'electric-buffer-menu-mode "24.2")
 204
 205 ;; generally the same as Buffer-menu-mode-map
 206 ;;  (except we don't indirect to global-map)
 207 (put 'Electric-buffer-menu-undefined 'suppress-keymap t)
 208
 209 (defun Electric-buffer-menu-exit ()
 210   (interactive)
 211   (setq unread-command-events (listify-key-sequence (this-command-keys)))
 212   ;; for robustness
 213   (condition-case ()
 214       (throw 'electric-buffer-menu-select nil)
 215     (error (Buffer-menu-mode)
 216            (other-buffer))))
 217
 218 (defun Electric-buffer-menu-select ()
 219   "Leave Electric Buffer Menu, selecting buffers and executing changes.
 220 Save buffers marked \"S\".  Delete buffers marked \"K\".
 221 Select buffer at point and display buffers marked \">\" in other windows."
 222   (interactive)
 223   (throw 'electric-buffer-menu-select (point)))
 224
 225 (defun Electric-buffer-menu-mouse-select (event)
 226   (interactive "e")
 227   (select-window (posn-window (event-end event)))
 228   (set-buffer (window-buffer (selected-window)))
 229   (goto-char (posn-point (event-end event)))
 230   (throw 'electric-buffer-menu-select (point)))
 231
 232 (defun Electric-buffer-menu-quit ()
 233   "Leave Electric Buffer Menu, restoring previous window configuration.
 234 Skip execution of select, save, and delete commands."
 235   (interactive)
 236   (throw 'electric-buffer-menu-select nil))
 237
 238 (defun Electric-buffer-menu-undefined ()
 239   (interactive)
 240   (ding)
 241   (message "%s"
 242            (substitute-command-keys "\
 243 Type \\[Electric-buffer-menu-quit] to exit, \
 244 \\[Electric-buffer-menu-select] to select, \
 245 \\[Helper-help] for help, \\[Helper-describe-bindings] for commands."))
 246   (sit-for 4))
 247
 248 (defun Electric-buffer-menu-mode-view-buffer ()
 249   "View buffer on current line in Electric Buffer Menu.
 250 Return to Electric Buffer Menu when done."
 251   (interactive)
 252   (let ((bufnam (Buffer-menu-buffer nil)))
 253     (if bufnam
 254         (view-buffer bufnam)
 255       (ding)
 256       (message "Buffer %s does not exist!" bufnam)
 257       (sit-for 4))))
 258
 259 (defvar electric-buffer-overlay nil)
 260
 261 (defun electric-buffer-update-highlight ()
 262   (when (derived-mode-p 'electric-buffer-menu-mode)
 263     ;; Make sure we have an overlay to use.
 264     (or electric-buffer-overlay
 265         (set (make-local-variable 'electric-buffer-overlay)
 266              (make-overlay (point) (point))))
 267     (move-overlay electric-buffer-overlay
 268                   (line-beginning-position)
 269                   (line-end-position))
 270     (overlay-put electric-buffer-overlay 'face 'highlight)))
 271
 272 (provide 'ebuff-menu)
 273
 274 ;;; ebuff-menu.el ends here