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1.1 root 1: ;; Buffer menu main function and support functions.
2: ;; Copyright (C) 1985, 1986, 1987, 1990 Free Software Foundation, Inc.
3:
4: ;; This file is part of GNU Emacs.
5:
6: ;; GNU Emacs is free software; you can redistribute it and/or modify
7: ;; it under the terms of the GNU General Public License as published by
8: ;; the Free Software Foundation; either version 1, or (at your option)
9: ;; any later version.
10:
11: ;; GNU Emacs is distributed in the hope that it will be useful,
12: ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
13: ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14: ;; GNU General Public License for more details.
15:
16: ;; You should have received a copy of the GNU General Public License
17: ;; along with GNU Emacs; see the file COPYING. If not, write to
18: ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
19:
20:
21: ; Put buffer *Buffer List* into proper mode right away
22: ; so that from now on even list-buffers is enough to get a buffer menu.
23:
24: (defvar Buffer-menu-mode-map nil "")
25:
26: (if Buffer-menu-mode-map
27: ()
28: (setq Buffer-menu-mode-map (make-keymap))
29: (suppress-keymap Buffer-menu-mode-map t)
30: (define-key Buffer-menu-mode-map "q" 'Buffer-menu-select)
31: (define-key Buffer-menu-mode-map "2" 'Buffer-menu-2-window)
32: (define-key Buffer-menu-mode-map "1" 'Buffer-menu-1-window)
33: (define-key Buffer-menu-mode-map "f" 'Buffer-menu-this-window)
34: (define-key Buffer-menu-mode-map "o" 'Buffer-menu-other-window)
35: (define-key Buffer-menu-mode-map "s" 'Buffer-menu-save)
36: (define-key Buffer-menu-mode-map "d" 'Buffer-menu-delete)
37: (define-key Buffer-menu-mode-map "k" 'Buffer-menu-delete)
38: (define-key Buffer-menu-mode-map "\C-d" 'Buffer-menu-delete-backwards)
39: (define-key Buffer-menu-mode-map "\C-k" 'Buffer-menu-delete)
40: (define-key Buffer-menu-mode-map "x" 'Buffer-menu-execute)
41: (define-key Buffer-menu-mode-map " " 'next-line)
42: (define-key Buffer-menu-mode-map "\177" 'Buffer-menu-backup-unmark)
43: (define-key Buffer-menu-mode-map "~" 'Buffer-menu-not-modified)
44: (define-key Buffer-menu-mode-map "?" 'describe-mode)
45: (define-key Buffer-menu-mode-map "u" 'Buffer-menu-unmark)
46: (define-key Buffer-menu-mode-map "m" 'Buffer-menu-mark))
47:
48: ;; Buffer Menu mode is suitable only for specially formatted data.
49: (put 'Buffer-menu-mode 'mode-class 'special)
50:
51: (defun Buffer-menu-mode ()
52: "Major mode for editing a list of buffers.
53: Each line describes one of the buffers in Emacs.
54: Letters do not insert themselves; instead, they are commands.
55: m -- mark buffer to be displayed.
56: q -- select buffer of line point is on.
57: Also show buffers marked with m in other windows.
58: 1 -- select that buffer in full-screen window.
59: 2 -- select that buffer in one window,
60: together with buffer selected before this one in another window.
61: f -- select that buffer in place of the buffer menu buffer.
62: o -- select that buffer in another window,
63: so the buffer menu buffer remains visible in its window.
64: ~ -- clear modified-flag on that buffer.
65: s -- mark that buffer to be saved, and move down.
66: d or k -- mark that buffer to be deleted, and move down.
67: C-d -- mark that buffer to be deleted, and move up.
68: x -- delete or save marked buffers.
69: u -- remove all kinds of marks from current line.
70: Delete -- back up a line and remove marks.
71:
72: Precisely,\\{Buffer-menu-mode-map}"
73: (kill-all-local-variables)
74: (use-local-map Buffer-menu-mode-map)
75: (setq truncate-lines t)
76: (setq buffer-read-only t)
77: (setq major-mode 'Buffer-menu-mode)
78: (setq mode-name "Buffer Menu")
79: (run-hooks 'buffer-menu-mode-hook))
80:
81: (defvar Buffer-menu-buffer-column 4)
82:
83: (defun Buffer-menu-buffer (error-if-non-existent-p)
84: "Return buffer described by this line of buffer menu."
85: (save-excursion
86: (beginning-of-line)
87: (forward-char Buffer-menu-buffer-column)
88: (let ((start (point))
89: string)
90: ;; End of buffer name marked by tab or two spaces.
91: (re-search-forward "\t\\| ")
92: (skip-chars-backward " \t")
93: (setq string (buffer-substring start (point)))
94: (or (get-buffer string)
95: (if error-if-non-existent-p
96: (error "No buffer named \"%s\"" string)
97: nil)))))
98:
99: (defun buffer-menu (arg)
100: "Make a menu of buffers so you can save, delete or select them.
101: With argument, show only buffers that are visiting files.
102: Type ? after invocation to get help on commands available.
103: Type q immediately to make the buffer menu go away."
104: (interactive "P")
105: (list-buffers arg)
106: (pop-to-buffer "*Buffer List*")
107: (forward-line 2)
108: (message
109: "Commands: d, s, x; 1, 2, m, u, q; delete; ~; ? for help."))
110:
111: (defun Buffer-menu-mark ()
112: "Mark buffer on this line for being displayed by \\[Buffer-menu-select] command."
113: (interactive)
114: (beginning-of-line)
115: (if (looking-at " [-M]")
116: (ding)
117: (let ((buffer-read-only nil))
118: (delete-char 1)
119: (insert ?>)
120: (forward-line 1))))
121:
122: (defun Buffer-menu-unmark ()
123: "Cancel all requested operations on buffer on this line."
124: (interactive)
125: (beginning-of-line)
126: (if (looking-at " [-M]")
127: (ding)
128: (let* ((buf (Buffer-menu-buffer t))
129: (mod (buffer-modified-p buf))
130: (readonly (save-excursion (set-buffer buf) buffer-read-only))
131: (buffer-read-only nil))
132: (delete-char 3)
133: (insert (if readonly (if mod " *%" " %") (if mod " * " " ")))))
134: (forward-line 1))
135:
136: (defun Buffer-menu-backup-unmark ()
137: "Move up and cancel all requested operations on buffer on line above."
138: (interactive)
139: (forward-line -1)
140: (Buffer-menu-unmark)
141: (forward-line -1))
142:
143: (defun Buffer-menu-delete ()
144: "Mark buffer on this line to be deleted by \\[Buffer-menu-execute] command."
145: (interactive)
146: (beginning-of-line)
147: (if (looking-at " [-M]") ;header lines
148: (ding)
149: (let ((buffer-read-only nil))
150: (delete-char 1)
151: (insert ?D)
152: (forward-line 1))))
153:
154: (defun Buffer-menu-delete-backwards ()
155: "Mark buffer on this line to be deleted by \\[Buffer-menu-execute] command
156: and then move up one line"
157: (interactive)
158: (Buffer-menu-delete)
159: (forward-line -2)
160: (if (looking-at " [-M]") (forward-line 1)))
161:
162: (defun Buffer-menu-save ()
163: "Mark buffer on this line to be saved by \\[Buffer-menu-execute] command."
164: (interactive)
165: (beginning-of-line)
166: (forward-char 1)
167: (if (looking-at " [-M]") ;header lines
168: (ding)
169: (let ((buffer-read-only nil))
170: (delete-char 1)
171: (insert ?S)
172: (forward-line 1))))
173:
174: (defun Buffer-menu-not-modified ()
175: "Mark buffer on this line as unmodified (no changes to save)."
176: (interactive)
177: (save-excursion
178: (set-buffer (Buffer-menu-buffer t))
179: (set-buffer-modified-p nil))
180: (save-excursion
181: (beginning-of-line)
182: (forward-char 1)
183: (if (looking-at "\\*")
184: (let ((buffer-read-only nil))
185: (delete-char 1)
186: (insert ? )))))
187:
188: (defun Buffer-menu-execute ()
189: "Save and/or delete buffers marked with \\[Buffer-menu-save] or \\[Buffer-menu-delete] commands."
190: (interactive)
191: (save-excursion
192: (goto-char (point-min))
193: (forward-line 1)
194: (while (re-search-forward "^.S" nil t)
195: (let ((modp nil))
196: (save-excursion
197: (set-buffer (Buffer-menu-buffer t))
198: (save-buffer)
199: (setq modp (buffer-modified-p)))
200: (let ((buffer-read-only nil))
201: (delete-char -1)
202: (insert (if modp ?* ? ))))))
203: (save-excursion
204: (goto-char (point-min))
205: (forward-line 1)
206: (let ((buff-menu-buffer (current-buffer))
207: (buffer-read-only nil))
208: (while (search-forward "\nD" nil t)
209: (forward-char -1)
210: (let ((buf (Buffer-menu-buffer nil)))
211: (or (eq buf nil)
212: (eq buf buff-menu-buffer)
213: (save-excursion (kill-buffer buf))))
214: (if (Buffer-menu-buffer nil)
215: (progn (delete-char 1)
216: (insert ? ))
217: (delete-region (point) (progn (forward-line 1) (point)))
218: (forward-char -1))))))
219:
220: (defun Buffer-menu-select ()
221: "Select this line's buffer; also display buffers marked with \">\".
222: You can mark buffers with the \\[Buffer-menu-mark] command."
223: (interactive)
224: (let ((buff (Buffer-menu-buffer t))
225: (menu (current-buffer))
226: (others ())
227: tem)
228: (goto-char (point-min))
229: (while (search-forward "\n>" nil t)
230: (setq tem (Buffer-menu-buffer t))
231: (let ((buffer-read-only nil))
232: (delete-char -1)
233: (insert ?\ ))
234: (or (eq tem buff) (memq tem others) (setq others (cons tem others))))
235: (setq others (nreverse others)
236: tem (/ (1- (screen-height)) (1+ (length others))))
237: (delete-other-windows)
238: (switch-to-buffer buff)
239: (or (eq menu buff)
240: (bury-buffer menu))
241: (while others
242: (split-window nil tem)
243: (other-window 1)
244: (switch-to-buffer (car others))
245: (setq others (cdr others)))
246: (other-window 1))) ;back to the beginning!
247:
248: (defun Buffer-menu-1-window ()
249: "Select this line's buffer, alone, in full screen."
250: (interactive)
251: (switch-to-buffer (Buffer-menu-buffer t))
252: (bury-buffer (other-buffer))
253: (delete-other-windows))
254:
255: (defun Buffer-menu-this-window ()
256: "Select this line's buffer in this window."
257: (interactive)
258: (switch-to-buffer (Buffer-menu-buffer t)))
259:
260: (defun Buffer-menu-other-window ()
261: "Select this line's buffer in other window, leaving buffer menu visible."
262: (interactive)
263: (switch-to-buffer-other-window (Buffer-menu-buffer t)))
264:
265: (defun Buffer-menu-2-window ()
266: "Select this line's buffer, with previous buffer in second window."
267: (interactive)
268: (let ((buff (Buffer-menu-buffer t))
269: (menu (current-buffer))
270: (pop-up-windows t))
271: (switch-to-buffer (other-buffer))
272: (pop-to-buffer buff)
273: (bury-buffer menu)))
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