summaryrefslogtreecommitdiff
path: root/lisp/ebuff-menu.el
blob: 3e37d2c700b7e56f590d78cbd22e66e4dfaa52e2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
;;; ebuff-menu.el --- electric-buffer-list mode

;; Copyright (C) 1985, 1986, 1994, 2001, 2002, 2003, 2004,
;;   2005, 2006, 2007, 2008 Free Software Foundation, Inc.

;; Author: Richard Mlynarik <mly@ai.mit.edu>
;; 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 3, 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., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; Commentary:

;; Who says one can't have typeout windows in GNU Emacs?   The entry
;; point, `electric-buffer-list' works like ^r select buffer from the
;; ITS Emacs lunar or tmacs libraries.

;;; Code:

(require 'electric)

;; this depends on the format of list-buffers (from src/buffer.c) and
;; on stuff in lisp/buff-menu.el

(defvar electric-buffer-menu-mode-map nil)

(defvar electric-buffer-menu-mode-hook nil
  "Normal hook run by `electric-buffer-list'.")

;;;###autoload
(defun electric-buffer-list (arg)
  "Pop up a buffer describing the set of Emacs buffers.
Vaguely like ITS lunar select buffer; combining typeoutoid buffer
listing with menuoid buffer selection.

If the very next character typed is a space then the buffer list
window disappears.  Otherwise, one may move around in the buffer list
window, marking buffers to be selected, saved or deleted.

To exit and select a new buffer, type a space when the cursor is on
the appropriate line of the buffer-list window.  Other commands are
much like those of `Buffer-menu-mode'.

Run hooks in `electric-buffer-menu-mode-hook' on entry.

\\{electric-buffer-menu-mode-map}"
  (interactive "P")
  (let (select buffer)
    (save-window-excursion
      (setq buffer (list-buffers-noselect arg))
      (Electric-pop-up-window buffer)
      (unwind-protect
	  (progn
	    (set-buffer buffer)
	    (Electric-buffer-menu-mode)
	    (electric-buffer-update-highlight)
	    (setq select
		  (catch 'electric-buffer-menu-select
		    (message "<<< Press Return to bury the buffer list >>>")
		    (if (eq (setq unread-command-events (list (read-event)))
			    ?\s)
			(progn (setq unread-command-events nil)
			       (throw 'electric-buffer-menu-select nil)))
		    (let ((start-point (point))
			  (first (progn (goto-char (point-min))
					(unless Buffer-menu-use-header-line
					  (forward-line 2))
					(point)))
			  (last (progn (goto-char (point-max))
				       (forward-line -1)
				       (point)))
			  (goal-column 0))
		      ;; Use start-point if it is meaningful.
		      (goto-char (if (or (< start-point first)
					 (> start-point last))
				     first
				   start-point))
		      (Electric-command-loop 'electric-buffer-menu-select
					     nil
					     t
					     'electric-buffer-menu-looper
					     (cons first last))))))
	(set-buffer buffer)
	(Buffer-menu-mode)
	(bury-buffer buffer)
	(message "")))
    (if select
	(progn (set-buffer buffer)
	       (let ((opoint (point-marker)))
		 (Buffer-menu-execute)
		 (goto-char (point-min))
		 (if (prog1 (search-forward "\n>" nil t)
		       (goto-char opoint) (set-marker opoint nil))
		     (Buffer-menu-select)
		     (switch-to-buffer (Buffer-menu-buffer t))))))))

(defun electric-buffer-menu-looper (state condition)
  (cond ((and condition
	      (not (memq (car condition) '(buffer-read-only
					   end-of-buffer
					   beginning-of-buffer))))
	 (signal (car condition) (cdr condition)))
	((< (point) (car state))
	 (goto-char (point-min))
	 (unless Buffer-menu-use-header-line
	   (forward-line 2)))
	((> (point) (cdr state))
	 (goto-char (point-max))
	 (forward-line -1)
	 (if (pos-visible-in-window-p (point-max))
	     (recenter -1))))
  (electric-buffer-update-highlight))

(defvar Helper-return-blurb)

(put 'Electric-buffer-menu-mode 'mode-class 'special)
(defun Electric-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.
\\<electric-buffer-menu-mode-map>
\\[keyboard-quit] or \\[Electric-buffer-menu-quit] -- exit buffer menu, returning to previous window and buffer
  configuration.  If the very first character typed is a space, it
  also has this effect.
\\[Electric-buffer-menu-select] -- select buffer of line point is on.
  Also show buffers marked with m in other windows,
  deletes buffers marked with \"D\", and saves those marked with \"S\".
\\[Buffer-menu-mark] -- mark buffer to be displayed.
\\[Buffer-menu-not-modified] -- clear modified-flag on that buffer.
\\[Buffer-menu-save] -- mark that buffer to be saved.
\\[Buffer-menu-delete] or \\[Buffer-menu-delete-backwards] -- mark that buffer to be deleted.
\\[Buffer-menu-unmark] -- remove all kinds of marks from current line.
\\[Electric-buffer-menu-mode-view-buffer] -- view buffer, returning when done.
\\[Buffer-menu-backup-unmark] -- back up a line and remove marks.

\\{electric-buffer-menu-mode-map}

Entry to this mode via command `electric-buffer-list' calls the value of
`electric-buffer-menu-mode-hook'."
  (let ((saved header-line-format))
    (kill-all-local-variables)
    (setq header-line-format saved))
  (use-local-map electric-buffer-menu-mode-map)
  (setq mode-name "Electric Buffer Menu")
  (setq mode-line-buffer-identification "Electric Buffer List")
  (make-local-variable 'Helper-return-blurb)
  (setq Helper-return-blurb "return to buffer editing")
  (setq truncate-lines t)
  (setq buffer-read-only t)
  (setq major-mode 'Electric-buffer-menu-mode)
  (goto-char (point-min))
  (if (search-forward "\n." nil t) (forward-char -1))
  (run-mode-hooks 'electric-buffer-menu-mode-hook))

;; generally the same as Buffer-menu-mode-map
;;  (except we don't indirect to global-map)
(put 'Electric-buffer-menu-undefined 'suppress-keymap t)
(if electric-buffer-menu-mode-map
    nil
  (let ((map (make-keymap)))
    (fillarray (car (cdr map)) 'Electric-buffer-menu-undefined)
    (define-key map "\e" nil)
    (define-key map "\C-z" 'suspend-frame)
    (define-key map "v" 'Electric-buffer-menu-mode-view-buffer)
    (define-key map (char-to-string help-char) 'Helper-help)
    (define-key map "?" 'Helper-describe-bindings)
    (define-key map "\C-c" nil)
    (define-key map "\C-c\C-c" 'Electric-buffer-menu-quit)
    (define-key map "\C-]" 'Electric-buffer-menu-quit)
    (define-key map "q" 'Electric-buffer-menu-quit)
    (define-key map " " 'Electric-buffer-menu-select)
    (define-key map "\C-m" 'Electric-buffer-menu-select)
    (define-key map "\C-l" 'recenter)
    (define-key map "s" 'Buffer-menu-save)
    (define-key map "d" 'Buffer-menu-delete)
    (define-key map "k" 'Buffer-menu-delete)
    (define-key map "\C-d" 'Buffer-menu-delete-backwards)
    ;(define-key map "\C-k" 'Buffer-menu-delete)
    (define-key map "\177" 'Buffer-menu-backup-unmark)
    (define-key map "~" 'Buffer-menu-not-modified)
    (define-key map "u" 'Buffer-menu-unmark)
    (let ((i ?0))
      (while (<= i ?9)
	(define-key map (char-to-string i) 'digit-argument)
	(define-key map (concat "\e" (char-to-string i)) 'digit-argument)
	(setq i (1+ i))))
    (define-key map "-" 'negative-argument)
    (define-key map "\e-" 'negative-argument)
    (define-key map "m" 'Buffer-menu-mark)
    (define-key map "\C-u" 'universal-argument)
    (define-key map "\C-p" 'previous-line)
    (define-key map "\C-n" 'next-line)
    (define-key map "p" 'previous-line)
    (define-key map "n" 'next-line)
    (define-key map "\C-v" 'scroll-up)
    (define-key map "\ev" 'scroll-down)
    (define-key map ">" 'scroll-right)
    (define-key map "<" 'scroll-left)
    (define-key map "\e\C-v" 'scroll-other-window)
    (define-key map "\e>" 'end-of-buffer)
    (define-key map "\e<" 'beginning-of-buffer)
    (define-key map "\e\e" nil)
    (define-key map "\e\e\e" 'Electric-buffer-menu-quit)
    (define-key map [escape escape escape] 'Electric-buffer-menu-quit)
    (define-key map [mouse-2] 'Electric-buffer-menu-mouse-select)
    (setq electric-buffer-menu-mode-map map)))

(defun Electric-buffer-menu-exit ()
  (interactive)
  (setq unread-command-events (listify-key-sequence (this-command-keys)))
  ;; for robustness
  (condition-case ()
      (throw 'electric-buffer-menu-select nil)
    (error (Buffer-menu-mode)
	   (other-buffer))))

(defun Electric-buffer-menu-select ()
  "Leave Electric Buffer Menu, selecting buffers and executing changes.
Save buffers marked \"S\".  Delete buffers marked \"K\".
Select buffer at point and display buffers marked \">\" in other windows."
  (interactive)
  (throw 'electric-buffer-menu-select (point)))

(defun Electric-buffer-menu-mouse-select (event)
  (interactive "e")
  (select-window (posn-window (event-end event)))
  (set-buffer (window-buffer (selected-window)))
  (goto-char (posn-point (event-end event)))
  (throw 'electric-buffer-menu-select (point)))

(defun Electric-buffer-menu-quit ()
  "Leave Electric Buffer Menu, restoring previous window configuration.
Skip execution of select, save, and delete commands."
  (interactive)
  (throw 'electric-buffer-menu-select nil))

(defun Electric-buffer-menu-undefined ()
  (interactive)
  (ding)
  (message "%s"
	   (if (and (eq (key-binding "\C-c\C-c") 'Electric-buffer-menu-quit)
		    (eq (key-binding " ") 'Electric-buffer-menu-select)
		    (eq (key-binding (char-to-string help-char)) 'Helper-help)
		    (eq (key-binding "?") 'Helper-describe-bindings))
	       (substitute-command-keys "Type C-c C-c to exit, Space to select, \\[Helper-help] for help, ? for commands")
	     (substitute-command-keys "\
Type \\[Electric-buffer-menu-quit] to exit, \
\\[Electric-buffer-menu-select] to select, \
\\[Helper-help] for help, \\[Helper-describe-bindings] for commands.")))
  (sit-for 4))

(defun Electric-buffer-menu-mode-view-buffer ()
  "View buffer on current line in Electric Buffer Menu.
Return to Electric Buffer Menu when done."
  (interactive)
  (let ((bufnam (Buffer-menu-buffer nil)))
    (if bufnam
	(view-buffer bufnam)
      (ding)
      (message "Buffer %s does not exist!" bufnam)
      (sit-for 4))))

(defvar electric-buffer-overlay nil)
(defun electric-buffer-update-highlight ()
  (when (eq major-mode 'Electric-buffer-menu-mode)
    ;; Make sure we have an overlay to use.
    (or electric-buffer-overlay
	(progn
	  (make-local-variable 'electric-buffer-overlay)
	  (setq electric-buffer-overlay (make-overlay (point) (point)))))
    (move-overlay electric-buffer-overlay
		  (save-excursion (beginning-of-line) (point))
		  (save-excursion (end-of-line) (point)))
    (overlay-put electric-buffer-overlay 'face 'highlight)))

(provide 'ebuff-menu)

;;; arch-tag: 1d4509b3-eece-4d4f-95ea-77c83eaf0275
;;; ebuff-menu.el ends here