| blob | 2436bab259759d9c7684e9e2bfed744a8964ff73 |
1 ;;; bs.el --- menu for selecting and displaying buffers
3 ;; Copyright (C) 1998-2011 Free Software Foundation, Inc.
4 ;; Author: Olaf Sylvester <Olaf.Sylvester@netsurf.de>
5 ;; Maintainer: Olaf Sylvester <Olaf.Sylvester@netsurf.de>
6 ;; Keywords: convenience
8 ;; This file is part of GNU Emacs.
10 ;; GNU Emacs is free software: you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation, either version 3 of the License, or
13 ;; (at your option) any later version.
15 ;; GNU Emacs is distributed in the hope that it will be useful,
16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 ;; GNU General Public License for more details.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
23 ;;; Commentary:
25 ;; Version: 1.17
26 ;; X-URL: http://www.geekware.de/software/emacs
27 ;;
28 ;; The bs-package contains a main function bs-show for poping up a
29 ;; buffer in a way similar to `list-buffers' and `electric-buffer-list':
30 ;; The new buffer offers a Buffer Selection Menu for manipulating
31 ;; the buffer list and buffers.
32 ;;
33 ;; -----------------------------------------------------------------------
34 ;; | MR Buffer Size Mode File |
35 ;; | -- ------ ---- ---- ---- |
36 ;; |. bs.el 14690 Emacs-Lisp /home/sun/sylvester/el/bs.e$|
37 ;; | % executable.el 9429 Emacs-Lisp /usr/share/emacs/19.34/lisp$|
38 ;; | % vc.el 104893 Emacs-Lisp /usr/share/emacs/19.34/lisp$|
39 ;; | % test_vc.el 486 Emacs-Lisp /home/sun/sylvester/el/test$|
40 ;; | % vc-hooks.el 43605 Emacs-Lisp /usr/share/emacs/19.34/lisp$|
41 ;; -----------------------------------------------------------------------
43 ;;; Quick Installation und Customization:
45 ;; Use
46 ;; M-x bs-show
47 ;; for buffer selection or optional bind a key to main function `bs-show'
48 ;; (global-set-key "\C-x\C-b" 'bs-show) ;; or another key
49 ;;
50 ;; For customization use
51 ;; M-x bs-customize
54 ;;; More Commentary:
56 ;; bs-show will generate a new buffer named *buffer-selection*, which shows
57 ;; all buffers or a subset of them, and has possibilities for deleting,
58 ;; saving and selecting buffers. For more details see docstring of
59 ;; function `bs-mode'. A current configuration describes which buffers appear
60 ;; in *buffer-selection*. See docstring of variable `bs-configurations' for
61 ;; more details.
62 ;;
63 ;; The package bs combines the advantages of the Emacs functions
64 ;; `list-buffers' and `electric-buffer-list'.
65 ;;
66 ;; Additional features for Buffer Selection Menu:
67 ;; - configurable list of buffers (show only files etc.).
68 ;; - comfortable way to change displayed subset of all buffers.
69 ;; - show sorted list of buffers.
70 ;; - cyclic navigation:
71 ;; - goes to top of buffer list if you are on last line and press down.
72 ;; - goes to end of buffer list if you are on first line and press up.
73 ;; - Offer an alternative buffer list by prefix key C-u.
75 ;;; Cycling through buffers
77 ;; This package offers two functions for buffer cycling. If you want to cycle
78 ;; through buffer list you can use `bs-cycle-next' or `bs-cycle-previous'.
79 ;; Bind these function to a key like
80 ;; (global-set-key [(f9)] 'bs-cycle-previous)
81 ;; (global-set-key [(f10)] 'bs-cycle-next)
82 ;;
83 ;; Both functions use a special subset of all buffers for cycling to avoid
84 ;; to go through internal buffers like *Messages*.
85 ;;
86 ;; Cycling through buffers ignores sorting because sorting destroys
87 ;; the logical buffer list. If buffer list is sorted by size you
88 ;; won't be able to cycle to the smallest buffer.
90 ;;; Customization:
92 ;; There is a customization group called `bs' in group `convenience'.
93 ;; Start customization by M-x bs-customize
94 ;;
95 ;; Buffer list
96 ;; -----------
97 ;; You can define your own configurations by extending variable
98 ;; `bs-configurations' (see docstring for details).
99 ;;
100 ;; `bs-default-configuration' contains the name of default configuration.
101 ;; The default value is "files" which means to show only files.
102 ;;
103 ;; If you always want to see all buffers, customize variable
104 ;; `bs-default-configuration' in customization group `bs'.
105 ;;
106 ;; Configure sorting
107 ;; -----------------
108 ;; You can define functions for sorting the buffer list.
109 ;; When selecting buffers, you can step through available sorting
110 ;; methods with key 'S'.
111 ;; To define a new way of sorting, customize variable `bs-sort-functions'.
112 ;;
113 ;; There are four basic functions for sorting:
114 ;; by buffer name, by mode, by size, or by filename
115 ;;
116 ;; Configure buffer cycling
117 ;; ------------------------
118 ;; When cycling through buffer list the functions for cycling will use
119 ;; the current configuration of bs to calculate the buffer list.
120 ;; If you want to use a different configuration for cycling you have to set
121 ;; the variable `bs-cycle-configuration-name'. You can customize this variable.
122 ;;
123 ;; For example: If you use the configuration called "files-and-scratch" you
124 ;; can cycle through all file buffers and *scratch* although your current
125 ;; configuration perhaps is "files" which ignores buffer *scratch*.
127 ;;; History:
129 ;;; Code:
133 ;; ----------------------------------------------------------------------
134 ;; Globals for customization
135 ;; ----------------------------------------------------------------------
138 "Buffer Selection: Maintaining buffers by buffer menu."
145 "Buffer Selection appearance: Appearance of bs buffer menu."
160 "List specifying the layout of a Buffer Selection Menu buffer.
161 Each entry specifies a column and is a list of the form of:
162 \(HEADER MINIMUM-LENGTH MAXIMUM-LENGTH ALIGNMENT FUN-OR-STRING)
164 HEADER : String for header for first line or a function
165 which calculates column title.
166 MINIMUM-LENGTH : Minimum width of column (number or name of function).
167 The function must return a positive integer.
168 MAXIMUM-LENGTH : Maximum width of column (number or name of function)
169 (currently ignored).
170 ALIGNMENT : Alignment of column (`left', `right', `middle').
171 FUN-OR-STRING : Name of a function for calculating the value or a
172 string for a constant value.
174 The function gets as parameter the buffer where we have started
175 buffer selection and the list of all buffers to show. The function must
176 return a string representing the column's value."
181 "Return a regexp matching the first line of a Buffer Selection Menu buffer."
184 ;; Font-Lock-Settings
189 ;; Buffername embedded by *
191 1
192 ;; problem in XEmacs with font-lock-constant-face
194 'font-lock-constant-face
196 ;; Dired-Buffers
198 ;; the star for modified buffers
203 "Maximal window height of Buffer Selection Menu."
208 "Regular expression specifying which buffers not to show.
209 A buffer whose name matches this regular expression will not be
213 "Regular expression for specifying buffers which must be shown.
214 A buffer whose name matches this regular expression will be
215 included in the buffer list.
216 Note that this variable is temporary: if the configuration is changed
217 it is reset to nil. Use `bs-must-always-show-regexp' to specify buffers
221 "Regular expression for specifying buffers to show always.
222 A buffer whose name matches this regular expression will
223 be shown regardless of current configuration of Buffer Selection Menu."
228 "Function for specifying buffers not to show.
229 The function gets one argument - the buffer to test. The function must
230 return a value different from nil to ignore the buffer in
234 "Function for specifying buffers which must be shown.
238 "Sort function to sort the buffers that appear in Buffer Selection Menu.
239 The function gets two arguments - the buffers to compare.
243 "Maximum column width for buffer names.
244 The column for buffer names has dynamic width. The width depends on
245 maximal and minimal length of names of buffers to show. The maximal
246 width is bounded by `bs-maximal-buffer-name-column'.
247 See also `bs-minimal-buffer-name-column'."
252 "Minimum column width for buffer names.
253 The column for buffer names has dynamic width. The width depends on
254 maximal and minimal length of names of buffers to show. The minimal
255 width is bounded by `bs-minimal-buffer-name-column'.
256 See also `bs-maximal-buffer-name-column'."
267 bs-sort-buffer-interns-are-last)
269 "List of all configurations you can use in the Buffer Selection Menu.
270 A configuration describes which buffers appear in Buffer Selection Menu
271 and also the order of buffers. A configuration is a list with
272 six elements. The first element is a string and describes the configuration.
273 The following five elements represent the values for Buffer Selection Menu
274 configuration variables `bs-must-show-regexp', `bs-must-show-function',
275 `bs-dont-show-regexp', `bs-dont-show-function' and `bs-buffer-sort-function'.
276 By setting these variables you define a configuration."
281 "Name of default configuration used by the Buffer Selection Menu.
284 Must be a string used in `bs-configurations' for naming a configuration."
289 "Name of configuration used when calling `bs-show' with \
291 Must be a string used in `bs-configurations' for naming a configuration."
296 "Name of current configuration.
300 "Name of configuration used when cycling through the buffer list.
301 A value of nil means to use current configuration `bs-default-configuration'.
302 Must be a string used in `bs-configurations' for naming a configuration."
305 string))
308 "String added in column 1 indicating a buffer will always be shown."
313 "String added in column 1 indicating a buffer will never be shown."
318 "String added in column 1 indicating the current buffer."
323 "String added in column 1 indicating the current buffer when it is marked."
328 "String added in column 1 indicating a marked buffer."
333 "String added in column 1 indicating an unmarked buffer."
338 "Maximum length of all displayed buffer names.
341 ;; ----------------------------------------------------------------------
342 ;; Internal globals
343 ;; ----------------------------------------------------------------------
346 "Flag for the current mode for showing this buffer.
347 A value of nil means buffer will be shown depending on the current
348 configuration.
349 A value of `never' means to never show the buffer.
354 ;; Make face named region (for XEmacs)
360 "Compare buffers B1 and B2 by buffer name."
365 "Compare buffers B1 and B2 by file name."
370 "Compare buffers B1 and B2 by mode name."
376 "Compare buffers B1 and B2 by buffer size."
385 "List of all possible sorting aspects for Buffer Selection Menu.
386 You can add a new entry with a call to `bs-define-sort-function'.
387 Each element is a list of four elements (NAME FUNCTION REGEXP-FOR-SORTING FACE).
388 NAME specifies the sort order defined by function FUNCTION.
389 FUNCTION nil means don't sort the buffer list. Otherwise the function
390 must have two parameters - the buffers to compare.
391 REGEXP-FOR-SORTING is a regular expression which describes the
392 column title to highlight.
393 FACE is a face used to fontify the sorted column title. A value of nil means
394 don't highlight."
399 "Define a new function for buffer sorting in Buffer Selection Menu.
400 NAME specifies the sort order defined by function FUN.
401 A value of nil for FUN means don't sort the buffer list. Otherwise the
402 functions must have two parameters - the buffers to compare.
403 REGEXP-FOR-SORTING is a regular expression which describes the
404 column title to highlight.
405 FACE is a face used to fontify the sorted column title. A value of nil means
406 don't highlight.
407 The new sort aspect will be inserted into list `bs-sort-functions'."
413 bs-sort-functions)))))
416 "Description of the current function for sorting the buffer list.
420 "Name of default sort behavior.
434 "Flag whether showing all buffers regardless of current configuration.
435 Non-nil means to show all buffers. Otherwise show buffers
442 "Regular expression specifying which buffers never to show.
443 A buffer whose name matches this regular expression will never be
447 "List of buffers shown in Buffer Selection Menu.
461 (define-key map "F" 'bs-select-other-frame)
462 (let ((key ?1))
463 (while (<= key ?9)
464 (define-key map (char-to-string key) 'digit-argument)
465 (setq key (1+ key))))
466 (define-key map "-" 'negative-argument)
467 (define-key map "\e-" 'negative-argument)
468 (define-key map "o" 'bs-select-other-window)
469 (define-key map "\C-o" 'bs-tmp-select-other-window)
470 ;; for GNU EMACS
471 (define-key map [mouse-3] 'bs-mouse-select-other-frame)
472 ;; for XEmacs
473 (define-key map [button3] 'bs-mouse-select-other-frame)
474 (define-key map [up] 'bs-up)
475 (define-key map "n" 'bs-down)
476 (define-key map "p" 'bs-up)
477 (define-key map [down] 'bs-down)
478 (define-key map "\C-m" 'bs-select)
479 (define-key map "b" 'bs-bury-buffer)
480 (define-key map "s" 'bs-save)
481 (define-key map "S" 'bs-show-sorted)
482 (define-key map "a" 'bs-toggle-show-all)
483 (define-key map "d" 'bs-delete)
484 (define-key map "\C-d" 'bs-delete-backward)
485 (define-key map "k" 'bs-delete)
486 (define-key map "g" 'bs-refresh)
487 (define-key map "C" 'bs-set-configuration-and-refresh)
488 (define-key map "c" 'bs-select-next-configuration)
489 (define-key map "q" 'bs-kill)
490 ;; (define-key map "z" 'bs-kill)
491 (define-key map "\C-c\C-c" 'bs-kill)
492 (define-key map "\C-g" 'bs-abort)
493 (define-key map "\C-]" 'bs-abort)
494 (define-key map "%" 'bs-toggle-readonly)
495 (define-key map "~" 'bs-clear-modified)
496 (define-key map "M" 'bs-toggle-current-to-show)
497 (define-key map "+" 'bs-set-current-buffer-to-show-always)
498 ;;(define-key map "-" 'bs-set-current-buffer-to-show-never)
499 (define-key map "t" 'bs-visit-tags-table)
500 (define-key map "m" 'bs-mark-current)
501 (define-key map "u" 'bs-unmark-current)
502 (define-key map ">" 'scroll-right)
503 (define-key map "<" 'scroll-left)
504 (define-key map "?" 'bs-help)
505 map)
506 "Keymap of `bs-mode'.")
508 ;; ----------------------------------------------------------------------
509 ;; Functions
510 ;; ----------------------------------------------------------------------
512 (defun bs-buffer-list (&optional list sort-description)
513 "Return a list of buffers to be shown.
514 LIST is a list of buffers to test for appearance in Buffer Selection Menu.
515 The result list depends on the global variables `bs-dont-show-regexp',
516 `bs-must-show-regexp', `bs-dont-show-function', `bs-must-show-function'
517 and `bs-buffer-sort-function'.
518 If SORT-DESCRIPTION isn't nil the list will be sorted by
519 a special function. SORT-DESCRIPTION is an element of `bs-sort-functions'."
520 (setq sort-description (or sort-description bs--current-sort-function)
521 list (or list (buffer-list)))
522 (let ((result nil))
523 (dolist (buf list)
524 (let* ((buffername (buffer-name buf))
525 (int-show-never (string-match-p bs--intern-show-never buffername))
526 (ext-show-never (and bs-dont-show-regexp
527 (string-match-p bs-dont-show-regexp
528 buffername)))
529 (extern-must-show (or (and bs-must-always-show-regexp
530 (string-match-p
531 bs-must-always-show-regexp
532 buffername))
533 (and bs-must-show-regexp
534 (string-match-p bs-must-show-regexp
535 buffername))))
536 (extern-show-never-from-fun (and bs-dont-show-function
537 (funcall bs-dont-show-function
538 buf)))
539 (extern-must-show-from-fun (and bs-must-show-function
540 (funcall bs-must-show-function
541 buf)))
542 (show-flag (buffer-local-value 'bs-buffer-show-mark buf)))
543 (when (or (eq show-flag 'always)
544 (and (or bs--show-all (not (eq show-flag 'never)))
545 (not int-show-never)
546 (or bs--show-all
547 extern-must-show
548 extern-must-show-from-fun
549 (and (not ext-show-never)
550 (not extern-show-never-from-fun)))))
551 (setq result (cons buf result)))))
552 (setq result (reverse result))
553 ;; The current buffer which was the start point of bs should be an element
554 ;; of result list, so that we can leave with space and be back in the
555 ;; buffer we started bs-show.
556 (when (and bs--buffer-coming-from
557 (buffer-live-p bs--buffer-coming-from)
558 (not (memq bs--buffer-coming-from result)))
559 (setq result (cons bs--buffer-coming-from result)))
560 ;; sorting
561 (if (and sort-description
562 (nth 1 sort-description))
563 (setq result (sort result (nth 1 sort-description)))
564 ;; else standard sorting
565 (bs-buffer-sort result))))
567 (defun bs-buffer-sort (buffer-list)
568 "Sort buffers in BUFFER-LIST according to `bs-buffer-sort-function'."
569 (if bs-buffer-sort-function
570 (sort buffer-list bs-buffer-sort-function)
571 buffer-list))
573 (defun bs--redisplay (&optional keep-line-p sort-description)
574 "Redisplay whole Buffer Selection Menu.
575 If KEEP-LINE-P is non-nil the point will stay on current line.
576 SORT-DESCRIPTION is an element of `bs-sort-functions'."
577 (let ((line (count-lines 1 (point))))
578 (bs-show-in-buffer (bs-buffer-list nil sort-description))
579 (when keep-line-p
580 (goto-char (point-min))
581 (forward-line line))
582 (beginning-of-line)))
584 (defun bs--goto-current-buffer ()
585 "Goto line which represents the current buffer;
586 actually the line which begins with character in `bs-string-current' or
587 `bs-string-current-marked'."
588 (let ((regexp (concat "^"
589 (regexp-quote bs-string-current)
591 (regexp-quote bs-string-current-marked)))
592 point)
593 (save-excursion
594 (goto-char (point-min))
595 (when (search-forward-regexp regexp nil t)
596 (setq point (1- (point)))))
597 (when point
598 (goto-char point))))
600 (defun bs--current-config-message ()
601 "Return a string describing the current `bs-mode' configuration."
602 (if bs--show-all
603 "Show all buffers."
604 (format "Show buffer by configuration %S"
605 bs-current-configuration)))
607 (defun bs--track-window-changes (frame)
608 "Track window changes to refresh the buffer list.
609 Used from `window-size-change-functions'."
610 (let ((win (get-buffer-window "*buffer-selection*" frame)))
611 (when win
612 (with-selected-window win
613 (bs--set-window-height)))))
615 (defun bs--remove-hooks ()
616 "Remove `bs--track-window-changes' and auxiliary hooks."
617 (remove-hook 'window-size-change-functions 'bs--track-window-changes)
618 ;; Remove itself
619 (remove-hook 'kill-buffer-hook 'bs--remove-hooks t)
620 (remove-hook 'change-major-mode-hook 'bs--remove-hooks t))
622 (put 'bs-mode 'mode-class 'special)
624 (define-derived-mode bs-mode nil "Buffer-Selection-Menu"
625 "Major mode for editing a subset of Emacs' buffers.
627 Aside from two header lines each line describes one buffer.
628 Move to a line representing the buffer you want to edit and select
630 There are many key commands similar to `Buffer-menu-mode' for
631 manipulating the buffer list and buffers.
632 For faster navigation each digit key is a digit argument.
638 remain in Buffer Selection Menu.
648 apply selected configuration.
650 available Buffer Selection Menu configuration.
654 to show always.
657 (make-local-variable 'font-lock-defaults)
658 (make-local-variable 'font-lock-verbose)
659 (make-local-variable 'font-lock-global-modes)
660 (buffer-disable-undo)
661 (setq buffer-read-only t
662 truncate-lines t
663 show-trailing-whitespace nil
664 font-lock-global-modes '(not bs-mode)
665 font-lock-defaults '(bs-mode-font-lock-keywords t)
666 font-lock-verbose nil)
667 (set (make-local-variable 'revert-buffer-function) 'bs-refresh)
668 (add-hook 'window-size-change-functions 'bs--track-window-changes)
669 (add-hook 'kill-buffer-hook 'bs--remove-hooks nil t)
670 (add-hook 'change-major-mode-hook 'bs--remove-hooks nil t))
672 (defun bs--restore-window-config ()
673 "Restore window configuration on the current frame."
674 (when bs--window-config-coming-from
675 (let ((frame (selected-frame)))
676 (unwind-protect
677 (set-window-configuration bs--window-config-coming-from)
678 (select-frame frame)))
679 (setq bs--window-config-coming-from nil)))
681 (defun bs-kill ()
682 "Let buffer disappear and reset window configuration."
683 (interactive)
684 (bury-buffer (current-buffer))
685 (bs--restore-window-config))
687 (defun bs-abort ()
688 "Ding and leave Buffer Selection Menu without a selection."
689 (interactive)
690 (ding)
691 (bs-kill))
693 (defun bs-set-configuration-and-refresh ()
694 "Ask user for a configuration and apply selected configuration.
695 Refresh whole Buffer Selection Menu."
696 (interactive)
697 (call-interactively 'bs-set-configuration)
698 (bs--redisplay t))
700 (defun bs-refresh (&rest ignored)
701 "Refresh whole Buffer Selection Menu.
702 Arguments are IGNORED (for `revert-buffer')."
703 (interactive)
704 (bs--redisplay t))
706 (defun bs--set-window-height ()
707 "Change the height of the selected window to suit the current buffer list."
708 (unless (one-window-p t)
709 (fit-window-to-buffer (selected-window) bs-max-window-height)))
711 (defun bs--current-buffer ()
712 "Return buffer on current line.
713 Raise an error if not on a buffer line."
714 (beginning-of-line)
715 (let ((line (+ (- bs-header-lines-length)
716 (count-lines 1 (point)))))
717 (when (< line 0)
718 (error "You are on a header row"))
719 (nth line bs-current-list)))
721 (defun bs--update-current-line ()
722 "Update the entry on current line for Buffer Selection Menu."
723 (let ((buffer (bs--current-buffer))
724 (inhibit-read-only t))
725 (beginning-of-line)
726 (delete-region (point) (line-end-position))
727 (bs--insert-one-entry buffer)
728 (beginning-of-line)))
730 (defun bs-view ()
731 "View current line's buffer in View mode.
732 Leave Buffer Selection Menu."
733 (interactive)
734 (view-buffer (bs--current-buffer)))
736 (defun bs-select ()
737 "Select current line's buffer and other marked buffers.
738 If there are no marked buffers the window configuration before starting
739 Buffer Selection Menu will be restored.
740 If there are marked buffers each marked buffer and the current line's buffer
741 will be selected in a window.
742 Leave Buffer Selection Menu."
743 (interactive)
744 (let ((buffer (bs--current-buffer)))
745 (bury-buffer (current-buffer))
746 (bs--restore-window-config)
747 (switch-to-buffer buffer)
748 (when bs--marked-buffers
749 ;; Some marked buffers for selection
750 (let* ((all (delq buffer bs--marked-buffers))
751 (height (/ (1- (frame-height)) (1+ (length all)))))
752 (delete-other-windows)
753 (switch-to-buffer buffer)
754 (dolist (buf all)
755 (split-window nil height)
756 (other-window 1)
757 (switch-to-buffer buf))
758 ;; goto window we have started bs.
759 (other-window 1)))))
761 (defun bs-select-other-window ()
762 "Select current line's buffer by `switch-to-buffer-other-window'.
763 The window configuration before starting Buffer Selection Menu will be restored
764 unless there is no other window. In this case a new window will be created.
765 Leave Buffer Selection Menu."
766 (interactive)
767 (let ((buffer (bs--current-buffer)))
768 (bury-buffer (current-buffer))
769 (bs--restore-window-config)
770 (switch-to-buffer-other-window buffer)))
772 (defun bs-tmp-select-other-window ()
773 "Make the other window select this line's buffer.
774 The current window remains selected."
775 (interactive)
776 (let ((buffer (bs--current-buffer)))
777 (display-buffer buffer t)))
779 (defun bs-select-other-frame ()
780 "Select current line's buffer in new created frame.
781 Leave Buffer Selection Menu."
782 (interactive)
783 (let ((buffer (bs--current-buffer)))
784 (bury-buffer (current-buffer))
785 (bs--restore-window-config)
786 (switch-to-buffer-other-frame buffer)))
788 (defun bs-mouse-select-other-frame (event)
789 "Select selected line's buffer in new created frame.
790 Leave Buffer Selection Menu.
791 EVENT: a mouse click event."
792 (interactive "e")
793 (mouse-set-point event)
794 (bs-select-other-frame))
796 (defun bs-mouse-select (event)
797 "Select buffer on mouse click EVENT.
798 Select buffer by `bs-select'."
799 (interactive "e")
800 (mouse-set-point event)
801 (bs-select))
803 (defun bs-select-in-one-window ()
804 "Select current line's buffer in one window and delete other windows.
805 Leave Buffer Selection Menu."
806 (interactive)
807 (bs-select)
808 (delete-other-windows))
810 (defun bs-bury-buffer ()
811 "Bury buffer on current line."
812 (interactive)
813 (bury-buffer (bs--current-buffer))
814 (bs--redisplay t))
816 (defun bs-save ()
817 "Save buffer on current line."
818 (interactive)
819 (with-current-buffer (bs--current-buffer)
820 (save-buffer))
821 (bs--update-current-line))
823 (defun bs-visit-tags-table ()
824 "Visit the tags table in the buffer on this line.
825 See `visit-tags-table'."
826 (interactive)
827 (let ((file (buffer-file-name (bs--current-buffer))))
828 (if file
829 (visit-tags-table file)
830 (error "Specified buffer has no file"))))
832 (defun bs-toggle-current-to-show ()
833 "Toggle status of showing flag for buffer in current line."
834 (interactive)
835 (let ((res
836 (with-current-buffer (bs--current-buffer)
837 (setq bs-buffer-show-mark (case bs-buffer-show-mark
838 ((nil) 'never)
839 ((never) 'always)
840 (t nil))))))
841 (bs--update-current-line)
842 (bs--set-window-height)
843 (bs--show-config-message res)))
845 (defun bs-set-current-buffer-to-show-always (&optional not-to-show-p)
846 "Toggle status of buffer on line to `always shown'.
847 NOT-TO-SHOW-P: prefix argument.
848 With no prefix argument the buffer on current line is marked to show
849 always. Otherwise it is marked to show never."
850 (interactive "P")
851 (if not-to-show-p
852 (bs-set-current-buffer-to-show-never)
853 (bs--set-toggle-to-show (bs--current-buffer) 'always)))
855 (defun bs-set-current-buffer-to-show-never ()
856 "Toggle status of buffer on line to `never shown'."
857 (interactive)
858 (bs--set-toggle-to-show (bs--current-buffer) 'never))
860 (defun bs--set-toggle-to-show (buffer what)
861 "Set value `bs-buffer-show-mark' of buffer BUFFER to WHAT.
862 Redisplay current line and display a message describing
863 the status of buffer on current line."
864 (with-current-buffer buffer (setq bs-buffer-show-mark what))
865 (bs--update-current-line)
866 (bs--set-window-height)
867 (bs--show-config-message what))
869 (defun bs--mark-unmark (count fun)
870 "Call FUN on COUNT consecutive buffers of *buffer-selection*."
871 (let ((dir (if (> count 0) 1 -1)))
872 (dotimes (i (abs count))
873 (let ((buffer (bs--current-buffer)))
874 (when buffer (funcall fun buffer))
875 (bs--update-current-line)
876 (bs-down dir)))))
878 (defun bs-mark-current (count)
879 "Mark buffers.
880 COUNT is the number of buffers to mark.
881 Move cursor vertically down COUNT lines."
882 (interactive "p")
883 (bs--mark-unmark count
884 (lambda (buf)
885 (add-to-list 'bs--marked-buffers buf))))
887 (defun bs-unmark-current (count)
888 "Unmark buffers.
889 COUNT is the number of buffers to unmark.
890 Move cursor vertically down COUNT lines."
891 (interactive "p")
892 (bs--mark-unmark count
893 (lambda (buf)
894 (setq bs--marked-buffers (delq buf bs--marked-buffers)))))
896 (defun bs--show-config-message (what)
897 "Show message indicating the new showing status WHAT.
898 WHAT is a value of nil, `never', or `always'."
899 (bs-message-without-log (cond ((null what)
900 "Buffer will be shown normally.")
901 ((eq what 'never)
902 "Mark buffer to never be shown.")
903 (t "Mark buffer to show always."))))
905 (defun bs-delete ()
906 "Kill buffer on current line."
907 (interactive)
908 (let ((current (bs--current-buffer))
909 (inhibit-read-only t))
910 (unless (kill-buffer current)
911 (error "Buffer was not deleted"))
912 (setq bs-current-list (delq current bs-current-list))
913 (beginning-of-line)
914 (delete-region (point) (save-excursion
915 (end-of-line)
916 (if (eobp) (point) (1+ (point)))))
917 (when (eobp)
918 (backward-delete-char 1)
919 (beginning-of-line)
920 (recenter -1))
921 (bs--set-window-height)))
923 (defun bs-delete-backward ()
924 "Like `bs-delete' but go to buffer in front of current."
925 (interactive)
926 (let ((on-last-line-p (save-excursion (end-of-line) (eobp))))
927 (bs-delete)
928 (unless on-last-line-p
929 (bs-up 1))))
931 (defun bs-show-sorted ()
932 "Show buffer list sorted by next sort aspect."
933 (interactive)
934 (setq bs--current-sort-function
935 (bs-next-config-aux (car bs--current-sort-function)
936 bs-sort-functions))
937 (bs--redisplay)
938 (bs--goto-current-buffer)
939 (bs-message-without-log "Sorted %s" (car bs--current-sort-function)))
941 (defun bs-apply-sort-faces (&optional sort-description)
942 "Set text properties for the sort described by SORT-DESCRIPTION.
943 SORT-DESCRIPTION is an element of `bs-sort-functions'.
944 Default is `bs--current-sort-function'."
945 (let ((sort-description (or sort-description
946 bs--current-sort-function)))
947 (save-excursion
948 (goto-char (point-min))
949 (when (and (nth 2 sort-description)
950 (search-forward-regexp (nth 2 sort-description) nil t))
951 (let ((inhibit-read-only t))
952 (put-text-property (match-beginning 0)
953 (match-end 0)
954 'face
955 (or (nth 3 sort-description)
956 'region)))))))
958 (defun bs-toggle-show-all ()
959 "Toggle show all buffers / show buffers with current configuration."
960 (interactive)
961 (setq bs--show-all (not bs--show-all))
962 (bs--redisplay)
963 (bs--goto-current-buffer)
964 (bs-message-without-log "%s" (bs--current-config-message)))
966 (defun bs-toggle-readonly ()
967 "Toggle read-only status for buffer on current line.
968 Uses function `toggle-read-only'."
969 (interactive)
970 (with-current-buffer (bs--current-buffer)
971 (toggle-read-only))
972 (bs--update-current-line))
974 (defun bs-clear-modified ()
975 "Set modified flag for buffer on current line to nil."
976 (interactive)
977 (with-current-buffer (bs--current-buffer)
978 (set-buffer-modified-p nil))
979 (bs--update-current-line))
981 (defun bs--nth-wrapper (count fun &rest args)
982 "Call COUNT times function FUN with arguments ARGS."
983 (dotimes (i (or count 1))
984 (apply fun args)))
986 (defun bs-up (arg)
987 "Move cursor vertically up ARG lines in Buffer Selection Menu."
988 (interactive "p")
989 (if (and arg (numberp arg) (< arg 0))
990 (bs--nth-wrapper (- arg) 'bs--down)
991 (bs--nth-wrapper arg 'bs--up)))
993 (defun bs--up ()
994 "Move cursor vertically up one line.
995 If on top of buffer list go to last line."
996 (if (> (count-lines 1 (point)) bs-header-lines-length)
997 (forward-line -1)
998 (goto-char (point-max))
999 (beginning-of-line)
1000 (recenter -1)))
1002 (defun bs-down (arg)
1003 "Move cursor vertically down ARG lines in Buffer Selection Menu."
1004 (interactive "p")
1005 (if (and arg (numberp arg) (< arg 0))
1006 (bs--nth-wrapper (- arg) 'bs--up)
1007 (bs--nth-wrapper arg 'bs--down)))
1009 (defun bs--down ()
1010 "Move cursor vertically down one line.
1011 If at end of buffer list go to first line."
1012 (if (eq (line-end-position) (point-max))
1013 (progn
1014 (goto-char (point-min))
1015 (forward-line bs-header-lines-length))
1016 (forward-line 1)))
1018 (defun bs-visits-non-file (buffer)
1019 "Return whether BUFFER visits no file.
1020 A value of t means BUFFER belongs to no file.
1021 A value of nil means BUFFER belongs to a file."
1022 (not (buffer-file-name buffer)))
1024 (defun bs-sort-buffer-interns-are-last (b1 b2)
1025 "Function for sorting internal buffers at the end of all buffers."
1028 ;; ----------------------------------------------------------------------
1029 ;; Configurations:
1030 ;; ----------------------------------------------------------------------
1032 (defun bs-config-clear ()
1033 "Reset all variables which specify a configuration.
1034 These variables are `bs-dont-show-regexp', `bs-must-show-regexp',
1035 `bs-dont-show-function', `bs-must-show-function' and
1036 `bs-buffer-sort-function'."
1037 (setq bs-dont-show-regexp nil
1038 bs-must-show-regexp nil
1039 bs-dont-show-function nil
1040 bs-must-show-function nil
1041 bs-buffer-sort-function nil))
1043 (defun bs-config--only-files ()
1044 "Define a configuration for showing only buffers visiting a file."
1045 (bs-config-clear)
1046 (setq ;; I want to see *-buffers at the end
1047 bs-buffer-sort-function 'bs-sort-buffer-interns-are-last
1048 ;; Don't show files who don't belong to a file
1049 bs-dont-show-function 'bs-visits-non-file))
1051 (defun bs-config--files-and-scratch ()
1052 "Define a configuration for showing buffer *scratch* and file buffers."
1053 (bs-config-clear)
1054 (setq ;; I want to see *-buffers at the end
1055 bs-buffer-sort-function 'bs-sort-buffer-interns-are-last
1056 ;; Don't show files who don't belong to a file
1057 bs-dont-show-function 'bs-visits-non-file
1058 ;; Show *scratch* buffer.
1061 (defun bs-config--all ()
1062 "Define a configuration for showing all buffers.
1063 Reset all according variables by `bs-config-clear'."
1064 (bs-config-clear))
1066 (defun bs-config--all-intern-last ()
1067 "Define a configuration for showing all buffers.
1068 Internal buffers appear at end of all buffers."
1069 (bs-config-clear)
1070 ;; I want to see *-buffers at the end
1071 (setq bs-buffer-sort-function 'bs-sort-buffer-interns-are-last))
1073 (defun bs-set-configuration (name)
1074 "Set configuration to the one saved under string NAME in `bs-configurations'.
1075 When called interactively ask user for a configuration and apply selected
1076 configuration."
1077 (interactive (list (completing-read "Use configuration: "
1078 bs-configurations
1079 nil
1080 t)))
1081 (let ((list (assoc name bs-configurations)))
1082 (if list
1083 (if (listp list)
1084 (setq bs-current-configuration name
1085 bs-must-show-regexp (nth 1 list)
1086 bs-must-show-function (nth 2 list)
1087 bs-dont-show-regexp (nth 3 list)
1088 bs-dont-show-function (nth 4 list)
1089 bs-buffer-sort-function (nth 5 list))
1090 ;; for backward compability
1091 (funcall (cdr list)))
1092 ;; else
1093 (ding)
1094 (bs-message-without-log "No bs-configuration named %S." name))))
1096 (defun bs-help ()
1097 "Help for `bs-show'."
1098 (interactive)
1099 (describe-function 'bs-mode))
1101 (defun bs-next-config-aux (start-name list)
1102 "Get the next assoc after START-NAME in list LIST.
1103 Will return the first if START-NAME is at end."
1104 (let ((assocs list)
1105 (length (length list))
1106 pos)
1107 (while (and assocs (not pos))
1108 (when (string= (car (car assocs)) start-name)
1109 (setq pos (- length (length assocs))))
1110 (setq assocs (cdr assocs)))
1111 (setq pos (1+ pos))
1112 (if (eq pos length)
1113 (car list)
1114 (nth pos list))))
1116 (defun bs-next-config (name)
1117 "Return next configuration with respect to configuration with name NAME."
1118 (bs-next-config-aux name bs-configurations))
1120 (defun bs-select-next-configuration (&optional start-name)
1121 "Apply next configuration START-NAME and refresh buffer list.
1122 If START-NAME is nil the current configuration `bs-current-configuration'
1123 will be used."
1124 (interactive)
1125 (let ((config (bs-next-config (or start-name bs-current-configuration))))
1126 (bs-set-configuration (car config))
1127 (setq bs-default-configuration bs-current-configuration)
1128 (bs--redisplay t)
1129 (bs--set-window-height)
1130 (bs-message-without-log "Selected configuration: %s" (car config))))
1132 (defun bs-show-in-buffer (list)
1133 "Display buffer list LIST in buffer *buffer-selection*.
1134 Select buffer *buffer-selection* and display buffers according to current
1135 configuration `bs-current-configuration'. Set window height, fontify buffer
1136 and move point to current buffer."
1137 (setq bs-current-list list)
1138 (switch-to-buffer (get-buffer-create "*buffer-selection*"))
1139 (bs-mode)
1140 (let* ((inhibit-read-only t)
1141 (map-fun (lambda (entry)
1142 (length (buffer-name entry))))
1143 (max-length-of-names (apply 'max
1144 (cons 0 (mapcar map-fun list))))
1145 (name-entry-length (min bs-maximal-buffer-name-column
1146 (max bs-minimal-buffer-name-column
1147 max-length-of-names))))
1148 (erase-buffer)
1149 (setq bs--name-entry-length name-entry-length)
1150 (bs--show-header)
1151 (dolist (buffer list)
1152 (bs--insert-one-entry buffer)
1154 (delete-char -1)
1155 (bs--set-window-height)
1156 (bs--goto-current-buffer)
1157 (font-lock-fontify-buffer)
1158 (bs-apply-sort-faces)
1159 (set-buffer-modified-p nil)))
1161 (defun bs-next-buffer (&optional buffer-list sorting-p)
1162 "Return next buffer and buffer list for buffer cycling in BUFFER-LIST.
1163 Ignore sorting when SORTING-P is nil.
1164 If BUFFER-LIST is nil the result of `bs-buffer-list' will be used as
1165 buffer list. The result is a cons of normally the second element of
1166 BUFFER-LIST and the buffer list used for buffer cycling."
1167 (let* ((bs--current-sort-function (if sorting-p
1168 bs--current-sort-function))
1169 (bs-buffer-list (or buffer-list (bs-buffer-list))))
1170 (cons (or (car (cdr bs-buffer-list))
1171 (car bs-buffer-list)
1172 (current-buffer))
1173 bs-buffer-list)))
1175 (defun bs-previous-buffer (&optional buffer-list sorting-p)
1176 "Return previous buffer and buffer list for buffer cycling in BUFFER-LIST.
1177 Ignore sorting when SORTING-P is nil.
1178 If BUFFER-LIST is nil the result of `bs-buffer-list' will be used as
1179 buffer list. The result is a cons of last element of BUFFER-LIST and the
1180 buffer list used for buffer cycling."
1181 (let* ((bs--current-sort-function (if sorting-p
1182 bs--current-sort-function))
1183 (bs-buffer-list (or buffer-list (bs-buffer-list))))
1184 (cons (or (car (last bs-buffer-list))
1185 (current-buffer))
1186 bs-buffer-list)))
1188 (defun bs-message-without-log (&rest args)
1189 "Like `message' but don't log it on the message log.
1190 All arguments ARGS are transferred to function `message'."
1191 (let ((message-log-max nil))
1192 (apply 'message args)))
1194 (defvar bs--cycle-list nil
1195 "Current buffer list used for cycling.")
1197 ;;;###autoload
1198 (defun bs-cycle-next ()
1199 "Select next buffer defined by buffer cycling.
1200 The buffers taking part in buffer cycling are defined
1201 by buffer configuration `bs-cycle-configuration-name'."
1202 (interactive)
1203 (let ((bs--buffer-coming-from (current-buffer))
1204 (bs-dont-show-regexp bs-dont-show-regexp)
1205 (bs-must-show-regexp bs-must-show-regexp)
1206 (bs-dont-show-function bs-dont-show-function)
1207 (bs-must-show-function bs-must-show-function)
1208 (bs--show-all nil))
1209 (bs-set-configuration (or bs-cycle-configuration-name bs-default-configuration))
1210 (let ((bs-buffer-sort-function nil)
1211 (bs--current-sort-function nil))
1212 (let* ((tupel (bs-next-buffer (if (or (eq last-command
1213 'bs-cycle-next)
1214 (eq last-command
1215 'bs-cycle-previous))
1216 bs--cycle-list)))
1217 (next (car tupel))
1218 (cycle-list (cdr tupel)))
1219 (unless (window-dedicated-p (selected-window))
1220 ;; We don't want the frame iconified if the only window in the frame
1221 ;; happens to be dedicated; let's get the error from switch-to-buffer
1222 (bury-buffer))
1223 (switch-to-buffer next)
1224 (setq bs--cycle-list (append (cdr cycle-list)
1225 (list (car cycle-list))))
1226 (bs-message-without-log "Next buffers: %s"
1227 (or (cdr bs--cycle-list)
1228 "this buffer"))))))
1230 ;;;###autoload
1231 (defun bs-cycle-previous ()
1232 "Select previous buffer defined by buffer cycling.
1233 The buffers taking part in buffer cycling are defined
1234 by buffer configuration `bs-cycle-configuration-name'."
1235 (interactive)
1236 (let ((bs--buffer-coming-from (current-buffer))
1237 (bs-dont-show-regexp bs-dont-show-regexp)
1238 (bs-must-show-regexp bs-must-show-regexp)
1239 (bs-dont-show-function bs-dont-show-function)
1240 (bs-must-show-function bs-must-show-function)
1241 (bs--show-all nil))
1242 (bs-set-configuration (or bs-cycle-configuration-name bs-default-configuration))
1243 (let ((bs-buffer-sort-function nil)
1244 (bs--current-sort-function nil))
1245 (let* ((tupel (bs-previous-buffer (if (or (eq last-command
1246 'bs-cycle-next)
1247 (eq last-command
1248 'bs-cycle-previous))
1249 bs--cycle-list)))
1250 (prev-buffer (car tupel))
1251 (cycle-list (cdr tupel)))
1252 (switch-to-buffer prev-buffer)
1253 (setq bs--cycle-list (append (last cycle-list)
1254 (reverse (cdr (reverse cycle-list)))))
1255 (bs-message-without-log "Previous buffers: %s"
1256 (or (reverse (cdr bs--cycle-list))
1257 "this buffer"))))))
1259 (defun bs--get-value (fun &optional args)
1260 "Apply function FUN with arguments ARGS.
1261 Return result of evaluation. Will return FUN if FUN is a number
1262 or a string."
1263 (cond ((numberp fun)
1264 fun)
1265 ((stringp fun)
1266 fun)
1267 (t (apply fun args))))
1269 (defun bs--get-marked-string (start-buffer all-buffers)
1270 "Return a string which describes whether current buffer is marked.
1271 START-BUFFER is the buffer where we started buffer selection.
1272 ALL-BUFFERS is the list of buffers appearing in Buffer Selection Menu.
1273 The result string is one of `bs-string-current', `bs-string-current-marked',
1274 `bs-string-marked', `bs-string-show-normally', `bs-string-show-never', or
1275 `bs-string-show-always'."
1276 (cond ;; current buffer is the buffer we started buffer selection.
1277 ((eq (current-buffer) start-buffer)
1278 (if (memq (current-buffer) bs--marked-buffers)
1279 bs-string-current-marked ; buffer is marked
1280 bs-string-current))
1281 ;; current buffer is marked
1282 ((memq (current-buffer) bs--marked-buffers)
1283 bs-string-marked)
1284 ;; current buffer hasn't a special mark.
1285 ((null bs-buffer-show-mark)
1286 bs-string-show-normally)
1287 ;; current buffer has a mark not to show itself.
1288 ((eq bs-buffer-show-mark 'never)
1289 bs-string-show-never)
1290 ;; otherwise current buffer is marked to show always.
1291 (t
1292 bs-string-show-always)))
1294 (defun bs--get-modified-string (start-buffer all-buffers)
1295 "Return a string which describes whether current buffer is modified.
1296 START-BUFFER is the buffer where we started buffer selection.
1297 ALL-BUFFERS is the list of buffers appearing in Buffer Selection Menu."
1298 (if (buffer-modified-p) "*" " "))
1300 (defun bs--get-readonly-string (start-buffer all-buffers)
1301 "Return a string which describes whether current buffer is read only.
1302 START-BUFFER is the buffer where we started buffer selection.
1303 ALL-BUFFERS is the list of buffers appearing in Buffer Selection Menu."
1304 (if buffer-read-only "%" " "))
1306 (defun bs--get-size-string (start-buffer all-buffers)
1307 "Return a string which describes the size of current buffer.
1308 START-BUFFER is the buffer where we started buffer selection.
1309 ALL-BUFFERS is the list of buffers appearing in Buffer Selection Menu."
1310 (int-to-string (buffer-size)))
1312 (defun bs--get-name (start-buffer all-buffers)
1313 "Return name of current buffer for Buffer Selection Menu.
1314 The name of current buffer gets additional text properties
1315 for mouse highlighting.
1316 START-BUFFER is the buffer where we started buffer selection.
1317 ALL-BUFFERS is the list of buffers appearing in Buffer Selection Menu."
1318 (propertize (buffer-name)
1319 'help-echo "mouse-2: select this buffer, mouse-3: select in other frame"
1320 'mouse-face 'highlight))
1322 (defun bs--get-mode-name (start-buffer all-buffers)
1323 "Return the name of mode of current buffer for Buffer Selection Menu.
1324 START-BUFFER is the buffer where we started buffer selection.
1325 ALL-BUFFERS is the list of buffers appearing in Buffer Selection Menu."
1326 (format-mode-line mode-name nil nil start-buffer))
1328 (defun bs--get-file-name (start-buffer all-buffers)
1329 "Return string for column 'File' in Buffer Selection Menu.
1330 This is the variable `buffer-file-name' of current buffer.
1331 If not visiting a file, `list-buffers-directory' is returned instead.
1332 START-BUFFER is the buffer where we started buffer selection.
1333 ALL-BUFFERS is the list of buffers appearing in Buffer Selection Menu."
1334 (propertize (or buffer-file-name
1335 (bound-and-true-p list-buffers-directory)
1336 "")
1337 'mouse-face 'highlight
1338 'help-echo "mouse-2: select this buffer, mouse-3: select in other frame"))
1340 (defun bs--insert-one-entry (buffer)
1341 "Generate one entry for buffer BUFFER in Buffer Selection Menu.
1342 It goes over all columns described in `bs-attributes-list'
1343 and evaluates corresponding string. Inserts string in current buffer;
1344 normally *buffer-selection*."
1345 (let ((string "")
1346 (to-much 0)
1347 (apply-args (append (list bs--buffer-coming-from bs-current-list))))
1348 (with-current-buffer buffer
1349 (dolist (column bs-attributes-list)
1350 (let* ((min (bs--get-value (nth 1 column)))
1351 (new-string (bs--format-aux (bs--get-value (nth 4 column) ; fun
1352 apply-args)
1353 (nth 3 column) ; align
1354 (- min to-much)))
1355 (len (length new-string)))
1356 (setq string (concat string new-string))
1357 (when (> len min)
1358 (setq to-much (- len min))))))
1359 (insert string)))
1361 (defun bs--format-aux (string align len)
1362 "Pad STRING to length LEN with alignment ALIGN.
1363 ALIGN is one of the symbols `left', `middle', or `right'."
1364 (let* ((width (length string))
1365 (len (max len width)))
1366 (format (format "%%%s%ds" (if (eq align 'right) "" "-") len)
1367 (if (eq align 'middle)
1368 (concat (make-string (/ (- len width) 2) ?\s) string)
1369 string))))
1371 (defun bs--show-header ()
1372 "Insert header for Buffer Selection Menu in current buffer."
1373 (insert (bs--create-header-line #'identity)
1375 (bs--create-header-line (lambda (title)
1376 (make-string (length title) ?-)))
1379 (defun bs--get-name-length ()
1380 "Return value of `bs--name-entry-length'."
1381 bs--name-entry-length)
1383 (defun bs--create-header-line (col)
1384 "Generate a line for the header.
1385 COL is called for each column in `bs-attributes-list' as a
1386 function of one argument, the string heading for the column."
1387 (mapconcat (lambda (column)
1388 (bs--format-aux (funcall col (bs--get-value (car column)))
1389 (nth 3 column) ; align
1390 (bs--get-value (nth 1 column))))
1391 bs-attributes-list
1392 ""))
1394 (defun bs--show-with-configuration (name &optional arg)
1395 "Display buffer list of configuration with name NAME.
1396 Set configuration NAME and determine window for Buffer Selection Menu.
1397 Unless current buffer is buffer *buffer-selection* we have to save
1398 the buffer we started Buffer Selection Menu and the current window
1399 configuration to restore buffer and window configuration after a
1400 selection. If there is already a window displaying *buffer-selection*
1401 select this window for Buffer Selection Menu. Otherwise open a new
1402 window.
1403 The optional argument ARG is the prefix argument when calling a function
1404 for buffer selection."
1405 (bs-set-configuration name)
1406 (let ((bs--show-all (or bs--show-all arg)))
1407 (unless (string= "*buffer-selection*" (buffer-name))
1408 ;; Only when not in buffer *buffer-selection*
1409 ;; we have to set the buffer we started the command
1410 (setq bs--buffer-coming-from (current-buffer)))
1411 (let ((liste (bs-buffer-list))
1412 (active-window (get-window-with-predicate
1413 (lambda (w)
1414 (string= (buffer-name (window-buffer w))
1415 "*buffer-selection*"))
1416 nil (selected-frame))))
1417 (if active-window
1418 (select-window active-window)
1419 (bs--restore-window-config)
1420 (setq bs--window-config-coming-from (current-window-configuration))
1421 (when (> (window-height (selected-window)) 7)
1422 (split-window-vertically)
1423 (other-window 1)))
1424 (bs-show-in-buffer liste)
1425 (bs-message-without-log "%s" (bs--current-config-message)))))
1427 (defun bs--configuration-name-for-prefix-arg (prefix-arg)
1428 "Convert prefix argument PREFIX-ARG to a name of a buffer configuration.
1429 If PREFIX-ARG is nil return `bs-default-configuration'.
1430 If PREFIX-ARG is an integer return PREFIX-ARG element of `bs-configurations'.
1431 Otherwise return `bs-alternative-configuration'."
1432 (cond ;; usually activation
1433 ((null prefix-arg)
1434 bs-default-configuration)
1435 ;; call with integer as prefix argument
1436 ((integerp prefix-arg)
1437 (if (and (< 0 prefix-arg) (<= prefix-arg (length bs-configurations)))
1438 (car (nth (1- prefix-arg) bs-configurations))
1439 bs-default-configuration))
1440 ;; call by prefix argument C-u
1441 (t bs-alternative-configuration)))
1443 ;; ----------------------------------------------------------------------
1444 ;; Main function bs-customize and bs-show
1445 ;; ----------------------------------------------------------------------
1447 ;;;###autoload
1448 (defun bs-customize ()
1449 "Customization of group bs for Buffer Selection Menu."
1450 (interactive)
1451 (customize-group "bs"))
1453 ;;;###autoload
1454 (defun bs-show (arg)
1455 "Make a menu of buffers so you can manipulate buffers or the buffer list.
1457 There are many key commands similar to `Buffer-menu-mode' for
1458 manipulating the buffer list and the buffers themselves.
1459 User can move with [up] or [down], select a buffer
1463 With prefix argument ARG show a different buffer list. Function
1464 `bs--configuration-name-for-prefix-arg' determine accordingly
1465 name of buffer configuration."
1466 (interactive "P")
1467 (setq bs--marked-buffers nil)
1468 (bs--show-with-configuration (bs--configuration-name-for-prefix-arg arg)))
1470 ;; ----------------------------------------------------------------------
1471 ;; Cleanup
1472 ;; ----------------------------------------------------------------------
1474 (defun bs-unload-function ()
1475 "Unload the Buffer Selection library."
1476 (let ((bs-buf (get-buffer "*buffer-selection*")))
1477 (when bs-buf
1478 (with-current-buffer bs-buf
1479 (when (eq major-mode 'bs-mode)
1480 (bs-kill)
1481 (kill-buffer bs-buf)))))
1482 ;; continue standard unloading
1483 nil)
1485 ;; Now provide feature bs
1486 (provide 'bs)
1488 ;;; bs.el ends here