ebuff-menu.el 8.9 KB

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  1. ; buggestions to mly@ai.ai.mit.edu
  2. ;; who says one can't have typeout windows in gnu emacs?
  3. ;; like ^r select buffer from its emacs lunar or tmacs libraries.
  4. ;; Copyright (C) 1985, 1986 Free Software Foundation, Inc.
  5. ;; This file is part of GNU Emacs.
  6. ;; GNU Emacs is distributed in the hope that it will be useful,
  7. ;; but WITHOUT ANY WARRANTY. No author or distributor
  8. ;; accepts responsibility to anyone for the consequences of using it
  9. ;; or for whether it serves any particular purpose or works at all,
  10. ;; unless he says so in writing. Refer to the GNU Emacs General Public
  11. ;; License for full details.
  12. ;; Everyone is granted permission to copy, modify and redistribute
  13. ;; GNU Emacs, but only under the conditions described in the
  14. ;; GNU Emacs General Public License. A copy of this license is
  15. ;; supposed to have been given to you along with GNU Emacs so you
  16. ;; can know your rights and responsibilities. It should be in a
  17. ;; file named COPYING. Among other things, the copyright notice
  18. ;; and this notice must be preserved on all copies.
  19. (require 'electric)
  20. ;; this depends on the format of list-buffers (from src/buffer.c) and
  21. ;; on stuff in lisp/buff-menu.el
  22. (defvar electric-buffer-menu-mode-map nil)
  23. (defun electric-buffer-list (arg)
  24. "Vaguely like ITS lunar select buffer;
  25. combining typeoutoid buffer listing with menuoid buffer selection.
  26. This pops up a buffer describing the set of emacs buffers.
  27. If the very next character typed is a space then the buffer list
  28. window disappears.
  29. Otherwise, one may move around in the buffer list window, marking
  30. buffers to be selected, saved or deleted.
  31. To exit and select a new buffer, type Space when the cursor is on the
  32. appropriate line of the buffer-list window.
  33. Other commands are much like those of buffer-menu-mode.
  34. Calls value of electric-buffer-menu-mode-hook on entry if non-nil.
  35. \\{electric-buffer-menu-mode-map}"
  36. (interactive "P")
  37. (let (select buffer)
  38. (save-window-excursion
  39. (save-window-excursion (list-buffers arg))
  40. (setq buffer (window-buffer (Electric-pop-up-window "*Buffer List*")))
  41. (unwind-protect
  42. (progn
  43. (set-buffer buffer)
  44. (Electric-buffer-menu-mode)
  45. (setq select
  46. (catch 'electric-buffer-menu-select
  47. (message "<<< Press Space to bury the buffer list >>>")
  48. (if (= (setq unread-command-char (read-char)) ?\ )
  49. (progn (setq unread-command-char -1)
  50. (throw 'electric-buffer-menu-select nil)))
  51. (let ((first (progn (goto-char (point-min))
  52. (forward-line 2)
  53. (point)))
  54. (last (progn (goto-char (point-max))
  55. (forward-line -1)
  56. (point)))
  57. (goal-column 0))
  58. (goto-char first)
  59. (Electric-command-loop 'electric-buffer-menu-select
  60. nil
  61. t
  62. 'electric-buffer-menu-looper
  63. (cons first last))))))
  64. (set-buffer buffer)
  65. (Buffer-menu-mode)
  66. (bury-buffer buffer)
  67. (message "")))
  68. (if select
  69. (progn (set-buffer buffer)
  70. (let ((opoint (point-marker)))
  71. (Buffer-menu-execute)
  72. (goto-char (point-min))
  73. (if (prog1 (search-forward "\n>" nil t)
  74. (goto-char opoint) (set-marker opoint nil))
  75. (Buffer-menu-select)
  76. (switch-to-buffer (Buffer-menu-buffer t))))))))
  77. (defun electric-buffer-menu-looper (state condition)
  78. (cond ((and condition
  79. (not (memq (car condition) '(buffer-read-only
  80. end-of-buffer
  81. beginning-of-buffer))))
  82. (signal (car condition) (cdr condition)))
  83. ((< (point) (car state))
  84. (goto-char (point-min))
  85. (forward-line 2))
  86. ((> (point) (cdr state))
  87. (goto-char (point-max))
  88. (forward-line -1)
  89. (if (pos-visible-in-window-p (point-max))
  90. (recenter -1)))))
  91. (put 'Electric-buffer-menu-mode 'mode-class 'special)
  92. (defun Electric-buffer-menu-mode ()
  93. "Major mode for editing a list of buffers.
  94. Each line describes one of the buffers in Emacs.
  95. Letters do not insert themselves; instead, they are commands.
  96. \\{electric-buffer-menu-mode-map}
  97. C-g or C-c C-c -- exit buffer menu, returning to previous window and buffer
  98. configuration. If the very first character typed is a space, it
  99. also has this effect.
  100. Space -- select buffer of line point is on.
  101. Also show buffers marked with m in other windows,
  102. deletes buffers marked with \"D\", and saves those marked with \"S\".
  103. m -- mark buffer to be displayed.
  104. ~ -- clear modified-flag on that buffer.
  105. s -- mark that buffer to be saved.
  106. d or C-d -- mark that buffer to be deleted.
  107. u -- remove all kinds of marks from current line.
  108. v -- view buffer, returning when done.
  109. Delete -- back up a line and remove marks.
  110. Entry to this mode via command \\[electric-buffer-list] calls the value of
  111. electric-buffer-menu-mode-hook if it is non-nil."
  112. (kill-all-local-variables)
  113. (use-local-map electric-buffer-menu-mode-map)
  114. (setq mode-name "Electric Buffer Menu")
  115. (setq mode-line-buffer-identification "Electric Buffer List")
  116. (if (memq 'mode-name mode-line-format)
  117. (progn (setq mode-line-format (copy-sequence mode-line-format))
  118. (setcar (memq 'mode-name mode-line-format) "Buffers")))
  119. (make-local-variable 'Helper-return-blurb)
  120. (setq Helper-return-blurb "return to buffer editing")
  121. (setq truncate-lines t)
  122. (setq buffer-read-only t)
  123. (setq major-mode 'Electric-buffer-menu-mode)
  124. (goto-char (point-min))
  125. (if (search-forward "\n." nil t) (forward-char -1))
  126. (run-hooks 'electric-buffer-menu-mode-hook))
  127. ;; generally the same as Buffer-menu-mode-map
  128. ;; (except we don't indirect to global-map)
  129. (put 'Electric-buffer-menu-undefined 'suppress-keymap t)
  130. (if electric-buffer-menu-mode-map
  131. nil
  132. (let ((map (make-keymap)))
  133. (fillarray map 'Electric-buffer-menu-undefined)
  134. (define-key map "\e" (make-keymap))
  135. (fillarray (lookup-key map "\e") 'Electric-buffer-menu-undefined)
  136. (define-key map "\C-z" 'suspend-emacs)
  137. (define-key map "v" 'Electric-buffer-menu-mode-view-buffer)
  138. (define-key map "\C-h" 'Helper-help)
  139. (define-key map "?" 'Helper-describe-bindings)
  140. (define-key map "\C-c" nil)
  141. (define-key map "\C-c\C-c" 'Electric-buffer-menu-quit)
  142. (define-key map "\C-]" 'Electric-buffer-menu-quit)
  143. (define-key map "q" 'Electric-buffer-menu-quit)
  144. (define-key map " " 'Electric-buffer-menu-select)
  145. (define-key map "\C-l" 'recenter)
  146. (define-key map "s" 'Buffer-menu-save)
  147. (define-key map "d" 'Buffer-menu-delete)
  148. (define-key map "k" 'Buffer-menu-delete)
  149. (define-key map "\C-d" 'Buffer-menu-delete-backwards)
  150. ;(define-key map "\C-k" 'Buffer-menu-delete)
  151. (define-key map "\177" 'Buffer-menu-backup-unmark)
  152. (define-key map "~" 'Buffer-menu-not-modified)
  153. (define-key map "u" 'Buffer-menu-unmark)
  154. (let ((i ?0))
  155. (while (<= i ?9)
  156. (define-key map (char-to-string i) 'digit-argument)
  157. (define-key map (concat "\e" (char-to-string i)) 'digit-argument)
  158. (setq i (1+ i))))
  159. (define-key map "-" 'negative-argument)
  160. (define-key map "\e-" 'negative-argument)
  161. (define-key map "m" 'Buffer-menu-mark)
  162. (define-key map "\C-u" 'universal-argument)
  163. (define-key map "\C-p" 'previous-line)
  164. (define-key map "\C-n" 'next-line)
  165. (define-key map "p" 'previous-line)
  166. (define-key map "n" 'next-line)
  167. (define-key map "\C-v" 'scroll-up)
  168. (define-key map "\ev" 'scroll-down)
  169. (define-key map "\e\C-v" 'scroll-other-window)
  170. (define-key map "\e>" 'end-of-buffer)
  171. (define-key map "\e<" 'beginning-of-buffer)
  172. (setq electric-buffer-menu-mode-map map)))
  173. (defun Electric-buffer-menu-exit ()
  174. (interactive)
  175. (setq unread-command-char last-input-char)
  176. ;; for robustness
  177. (condition-case ()
  178. (throw 'electric-buffer-menu-select nil)
  179. (error (Buffer-menu-mode)
  180. (other-buffer))))
  181. (defun Electric-buffer-menu-select ()
  182. "Leave Electric Buffer Menu, selecting buffers and executing changes.
  183. Saves buffers marked \"S\". Deletes buffers marked \"K\".
  184. Selects buffer at point and displays buffers marked \">\" in other
  185. windows."
  186. (interactive)
  187. (throw 'electric-buffer-menu-select (point)))
  188. (defun Electric-buffer-menu-quit ()
  189. "Leave Electric Buffer Menu, restoring previous window configuration.
  190. Does not execute select, save, or delete commands."
  191. (interactive)
  192. (throw 'electric-buffer-menu-select nil))
  193. (defun Electric-buffer-menu-undefined ()
  194. (interactive)
  195. (ding)
  196. (message (if (and (eq (key-binding "\C-c\C-c") 'Electric-buffer-menu-quit)
  197. (eq (key-binding " ") 'Electric-buffer-menu-select)
  198. (eq (key-binding "\C-h") 'Helper-help)
  199. (eq (key-binding "?") 'Helper-describe-bindings))
  200. "Type C-c C-c to exit, Space to select, C-h for help, ? for commands"
  201. (substitute-command-keys "\
  202. Type \\[Electric-buffer-menu-quit] to exit, \
  203. \\[Electric-buffer-menu-select] to select, \
  204. \\[Helper-help] for help, \\[Helper-describe-bindings] for commands.")))
  205. (sit-for 4))
  206. (defun Electric-buffer-menu-mode-view-buffer ()
  207. "View buffer on current line in Electric Buffer Menu.
  208. Returns to Electric Buffer Menu when done."
  209. (interactive)
  210. (let ((bufnam (Buffer-menu-buffer nil)))
  211. (if bufnam
  212. (view-buffer bufnam)
  213. (ding)
  214. (message "Buffer %s does not exist!" bufnam)
  215. (sit-for 4))))