Commit | Line | Data |
---|---|---|
36a77f37 JB |
1 | ;;; outline.el --- outline mode commands for Emacs |
2 | ||
0d30b337 | 3 | ;; Copyright (C) 1986, 1993, 1994, 1995, 1997, 2000, 2001, 2002, |
aaef169d | 4 | ;; 2003, 2004, 2005, 2006 Free Software Foundation, Inc. |
36a77f37 JB |
5 | |
6 | ;; Maintainer: FSF | |
7 | ;; Keywords: outlines | |
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 2, or (at your option) | |
14 | ;; 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; see the file COPYING. If not, write to the | |
086add15 LK |
23 | ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
24 | ;; Boston, MA 02110-1301, USA. | |
36a77f37 JB |
25 | |
26 | ;;; Commentary: | |
27 | ||
28 | ;; This package is a major mode for editing outline-format documents. | |
29 | ;; An outline can be `abstracted' to show headers at any given level, | |
30 | ;; with all stuff below hidden. See the Emacs manual for details. | |
31 | ||
32 | ;;; Todo: | |
33 | ||
34 | ;; - subtree-terminators | |
35 | ;; - better handle comments before function bodies (i.e. heading) | |
36 | ;; - don't bother hiding whitespace | |
37 | ||
38 | ;;; Code: | |
39 | ||
f63f8737 JB |
40 | (defvar font-lock-warning-face) |
41 | ||
42 | ||
36a77f37 | 43 | (defgroup outlines nil |
7a5c8253 | 44 | "Support for hierarchical outlining." |
36a77f37 JB |
45 | :prefix "outline-" |
46 | :group 'editing) | |
47 | ||
48 | (defcustom outline-regexp "[*\^L]+" | |
1e0e9b38 | 49 | "Regular expression to match the beginning of a heading. |
36a77f37 JB |
50 | Any line whose beginning matches this regexp is considered to start a heading. |
51 | Note that Outline mode only checks this regexp at the start of a line, | |
52 | so the regexp need not (and usually does not) start with `^'. | |
53 | The recommended way to set this is with a Local Variables: list | |
54 | in the file it applies to. See also `outline-heading-end-regexp'." | |
55 | :type '(choice regexp (const nil)) | |
56 | :group 'outlines) | |
631c8020 | 57 | ;;;###autoload(put 'outline-regexp 'safe-local-variable 'string-or-null-p) |
36a77f37 JB |
58 | |
59 | (defcustom outline-heading-end-regexp "\n" | |
1e0e9b38 | 60 | "Regular expression to match the end of a heading line. |
36a77f37 JB |
61 | You can assume that point is at the beginning of a heading when this |
62 | regexp is searched for. The heading ends at the end of the match. | |
63 | The recommended way to set this is with a `Local Variables:' list | |
64 | in the file it applies to." | |
65 | :type 'regexp | |
66 | :group 'outlines) | |
67 | ||
68 | (defvar outline-mode-prefix-map | |
69 | (let ((map (make-sparse-keymap))) | |
70 | (define-key map "@" 'outline-mark-subtree) | |
71 | (define-key map "\C-n" 'outline-next-visible-heading) | |
72 | (define-key map "\C-p" 'outline-previous-visible-heading) | |
73 | (define-key map "\C-i" 'show-children) | |
74 | (define-key map "\C-s" 'show-subtree) | |
75 | (define-key map "\C-d" 'hide-subtree) | |
76 | (define-key map "\C-u" 'outline-up-heading) | |
77 | (define-key map "\C-f" 'outline-forward-same-level) | |
78 | (define-key map "\C-b" 'outline-backward-same-level) | |
79 | (define-key map "\C-t" 'hide-body) | |
80 | (define-key map "\C-a" 'show-all) | |
81 | (define-key map "\C-c" 'hide-entry) | |
82 | (define-key map "\C-e" 'show-entry) | |
83 | (define-key map "\C-l" 'hide-leaves) | |
84 | (define-key map "\C-k" 'show-branches) | |
85 | (define-key map "\C-q" 'hide-sublevels) | |
86 | (define-key map "\C-o" 'hide-other) | |
87 | (define-key map "\C-^" 'outline-move-subtree-up) | |
88 | (define-key map "\C-v" 'outline-move-subtree-down) | |
89 | (define-key map [(control ?<)] 'outline-promote) | |
90 | (define-key map [(control ?>)] 'outline-demote) | |
91 | (define-key map "\C-m" 'outline-insert-heading) | |
92 | ;; Where to bind outline-cycle ? | |
93 | map)) | |
94 | ||
95 | (defvar outline-mode-menu-bar-map | |
96 | (let ((map (make-sparse-keymap))) | |
97 | ||
98 | (define-key map [hide] (cons "Hide" (make-sparse-keymap "Hide"))) | |
99 | ||
100 | (define-key map [hide hide-other] '("Hide Other" . hide-other)) | |
101 | (define-key map [hide hide-sublevels] '("Hide Sublevels" . hide-sublevels)) | |
102 | (define-key map [hide hide-subtree] '("Hide Subtree" . hide-subtree)) | |
103 | (define-key map [hide hide-entry] '("Hide Entry" . hide-entry)) | |
104 | (define-key map [hide hide-body] '("Hide Body" . hide-body)) | |
105 | (define-key map [hide hide-leaves] '("Hide Leaves" . hide-leaves)) | |
106 | ||
107 | (define-key map [show] (cons "Show" (make-sparse-keymap "Show"))) | |
108 | ||
109 | (define-key map [show show-subtree] '("Show Subtree" . show-subtree)) | |
110 | (define-key map [show show-children] '("Show Children" . show-children)) | |
111 | (define-key map [show show-branches] '("Show Branches" . show-branches)) | |
112 | (define-key map [show show-entry] '("Show Entry" . show-entry)) | |
113 | (define-key map [show show-all] '("Show All" . show-all)) | |
114 | ||
115 | (define-key map [headings] | |
116 | (cons "Headings" (make-sparse-keymap "Headings"))) | |
117 | ||
118 | (define-key map [headings demote-subtree] | |
119 | '(menu-item "Demote subtree" outline-demote)) | |
120 | (define-key map [headings promote-subtree] | |
121 | '(menu-item "Promote subtree" outline-promote)) | |
122 | (define-key map [headings move-subtree-down] | |
123 | '(menu-item "Move subtree down" outline-move-subtree-down)) | |
124 | (define-key map [headings move-subtree-up] | |
125 | '(menu-item "Move subtree up" outline-move-subtree-up)) | |
126 | (define-key map [headings copy] | |
127 | '(menu-item "Copy to kill ring" outline-headers-as-kill | |
128 | :enable mark-active)) | |
129 | (define-key map [headings outline-insert-heading] | |
130 | '("New heading" . outline-insert-heading)) | |
131 | (define-key map [headings outline-backward-same-level] | |
132 | '("Previous Same Level" . outline-backward-same-level)) | |
133 | (define-key map [headings outline-forward-same-level] | |
134 | '("Next Same Level" . outline-forward-same-level)) | |
135 | (define-key map [headings outline-previous-visible-heading] | |
136 | '("Previous" . outline-previous-visible-heading)) | |
137 | (define-key map [headings outline-next-visible-heading] | |
138 | '("Next" . outline-next-visible-heading)) | |
139 | (define-key map [headings outline-up-heading] | |
140 | '("Up" . outline-up-heading)) | |
141 | map)) | |
142 | ||
143 | (defvar outline-minor-mode-menu-bar-map | |
144 | (let ((map (make-sparse-keymap))) | |
145 | (define-key map [outline] | |
146 | (cons "Outline" | |
147 | (nconc (make-sparse-keymap "Outline") | |
148 | ;; Remove extra separator | |
149 | (cdr | |
150 | ;; Flatten the major mode's menus into a single menu. | |
151 | (apply 'append | |
152 | (mapcar (lambda (x) | |
153 | (if (consp x) | |
154 | ;; Add a separator between each | |
155 | ;; part of the unified menu. | |
156 | (cons '(--- "---") (cdr x)))) | |
157 | outline-mode-menu-bar-map)))))) | |
158 | map)) | |
48c9ce10 | 159 | |
36a77f37 JB |
160 | |
161 | (defvar outline-mode-map | |
162 | (let ((map (make-sparse-keymap))) | |
163 | (define-key map "\C-c" outline-mode-prefix-map) | |
164 | (define-key map [menu-bar] outline-mode-menu-bar-map) | |
165 | map)) | |
166 | ||
167 | (defvar outline-font-lock-keywords | |
168 | '(;; | |
169 | ;; Highlight headings according to the level. | |
170 | (eval . (list (concat "^\\(?:" outline-regexp "\\).+") | |
171 | 0 '(outline-font-lock-face) nil t))) | |
172 | "Additional expressions to highlight in Outline mode.") | |
173 | ||
1f2503a5 LK |
174 | (defface outline-1 |
175 | '((t :inherit font-lock-function-name-face)) | |
176 | "Level 1." | |
177 | :group 'outlines) | |
178 | ||
179 | (defface outline-2 | |
180 | '((t :inherit font-lock-variable-name-face)) | |
181 | "Level 2." | |
182 | :group 'outlines) | |
183 | ||
184 | (defface outline-3 | |
185 | '((t :inherit font-lock-keyword-face)) | |
186 | "Level 3." | |
187 | :group 'outlines) | |
188 | ||
189 | (defface outline-4 | |
190 | '((t :inherit font-lock-builtin-face)) | |
191 | "Level 4." | |
192 | :group 'outlines) | |
193 | ||
194 | (defface outline-5 | |
195 | '((t :inherit font-lock-comment-face)) | |
196 | "Level 5." | |
197 | :group 'outlines) | |
198 | ||
199 | (defface outline-6 | |
200 | '((t :inherit font-lock-constant-face)) | |
201 | "Level 6." | |
202 | :group 'outlines) | |
203 | ||
204 | (defface outline-7 | |
205 | '((t :inherit font-lock-type-face)) | |
206 | "Level 7." | |
207 | :group 'outlines) | |
208 | ||
209 | (defface outline-8 | |
210 | '((t :inherit font-lock-string-face)) | |
211 | "Level 8." | |
212 | :group 'outlines) | |
36a77f37 JB |
213 | |
214 | (defvar outline-font-lock-faces | |
215 | [outline-1 outline-2 outline-3 outline-4 | |
216 | outline-5 outline-6 outline-7 outline-8]) | |
217 | ||
218 | (defvar outline-font-lock-levels nil) | |
219 | (make-variable-buffer-local 'outline-font-lock-levels) | |
220 | ||
221 | (defun outline-font-lock-face () | |
222 | ;; (save-excursion | |
223 | ;; (outline-back-to-heading t) | |
224 | ;; (let* ((count 0) | |
225 | ;; (start-level (funcall outline-level)) | |
226 | ;; (level start-level) | |
227 | ;; face-level) | |
228 | ;; (while (not (setq face-level | |
229 | ;; (if (or (bobp) (eq level 1)) 0 | |
230 | ;; (cdr (assq level outline-font-lock-levels))))) | |
231 | ;; (outline-up-heading 1 t) | |
232 | ;; (setq count (1+ count)) | |
233 | ;; (setq level (funcall outline-level))) | |
234 | ;; ;; Remember for later. | |
235 | ;; (unless (zerop count) | |
236 | ;; (setq face-level (+ face-level count)) | |
237 | ;; (push (cons start-level face-level) outline-font-lock-levels)) | |
238 | ;; (condition-case nil | |
239 | ;; (aref outline-font-lock-faces face-level) | |
240 | ;; (error font-lock-warning-face)))) | |
241 | (save-excursion | |
242 | (goto-char (match-beginning 0)) | |
243 | (looking-at outline-regexp) | |
244 | (condition-case nil | |
245 | (aref outline-font-lock-faces (1- (funcall outline-level))) | |
246 | (error font-lock-warning-face)))) | |
247 | ||
248 | (defvar outline-view-change-hook nil | |
249 | "Normal hook to be run after outline visibility changes.") | |
250 | ||
48c9ce10 JB |
251 | (defvar outline-mode-hook nil |
252 | "*This hook is run when outline mode starts.") | |
253 | ||
ca858c64 JL |
254 | (defvar outline-blank-line nil |
255 | "*Non-nil means to leave unhidden blank line before heading.") | |
256 | ||
36a77f37 JB |
257 | ;;;###autoload |
258 | (define-derived-mode outline-mode text-mode "Outline" | |
259 | "Set major mode for editing outlines with selective display. | |
260 | Headings are lines which start with asterisks: one for major headings, | |
261 | two for subheadings, etc. Lines not starting with asterisks are body lines. | |
262 | ||
263 | Body text or subheadings under a heading can be made temporarily | |
264 | invisible, or visible again. Invisible lines are attached to the end | |
265 | of the heading, so they move with it, if the line is killed and yanked | |
266 | back. A heading with text hidden under it is marked with an ellipsis (...). | |
267 | ||
268 | Commands:\\<outline-mode-map> | |
269 | \\[outline-next-visible-heading] outline-next-visible-heading move by visible headings | |
270 | \\[outline-previous-visible-heading] outline-previous-visible-heading | |
271 | \\[outline-forward-same-level] outline-forward-same-level similar but skip subheadings | |
272 | \\[outline-backward-same-level] outline-backward-same-level | |
273 | \\[outline-up-heading] outline-up-heading move from subheading to heading | |
274 | ||
275 | \\[hide-body] make all text invisible (not headings). | |
276 | \\[show-all] make everything in buffer visible. | |
277 | \\[hide-sublevels] make only the first N levels of headers visible. | |
278 | ||
279 | The remaining commands are used when point is on a heading line. | |
280 | They apply to some of the body or subheadings of that heading. | |
281 | \\[hide-subtree] hide-subtree make body and subheadings invisible. | |
282 | \\[show-subtree] show-subtree make body and subheadings visible. | |
283 | \\[show-children] show-children make direct subheadings visible. | |
284 | No effect on body, or subheadings 2 or more levels down. | |
285 | With arg N, affects subheadings N levels down. | |
286 | \\[hide-entry] make immediately following body invisible. | |
287 | \\[show-entry] make it visible. | |
288 | \\[hide-leaves] make body under heading and under its subheadings invisible. | |
289 | The subheadings remain visible. | |
290 | \\[show-branches] make all subheadings at all levels visible. | |
291 | ||
292 | The variable `outline-regexp' can be changed to control what is a heading. | |
293 | A line is a heading if `outline-regexp' matches something at the | |
294 | beginning of the line. The longer the match, the deeper the level. | |
295 | ||
296 | Turning on outline mode calls the value of `text-mode-hook' and then of | |
297 | `outline-mode-hook', if they are non-nil." | |
298 | (make-local-variable 'line-move-ignore-invisible) | |
299 | (setq line-move-ignore-invisible t) | |
300 | ;; Cause use of ellipses for invisible text. | |
301 | (add-to-invisibility-spec '(outline . t)) | |
302 | (set (make-local-variable 'paragraph-start) | |
303 | (concat paragraph-start "\\|\\(?:" outline-regexp "\\)")) | |
304 | ;; Inhibit auto-filling of header lines. | |
305 | (set (make-local-variable 'auto-fill-inhibit-regexp) outline-regexp) | |
306 | (set (make-local-variable 'paragraph-separate) | |
307 | (concat paragraph-separate "\\|\\(?:" outline-regexp "\\)")) | |
308 | (set (make-local-variable 'font-lock-defaults) | |
309 | '(outline-font-lock-keywords t nil nil backward-paragraph)) | |
310 | (setq imenu-generic-expression | |
311 | (list (list nil (concat "^\\(?:" outline-regexp "\\).*$") 0))) | |
53526855 | 312 | (add-hook 'change-major-mode-hook 'show-all nil t)) |
36a77f37 JB |
313 | |
314 | (defcustom outline-minor-mode-prefix "\C-c@" | |
315 | "*Prefix key to use for Outline commands in Outline minor mode. | |
316 | The value of this variable is checked as part of loading Outline mode. | |
317 | After that, changing the prefix key requires manipulating keymaps." | |
318 | :type 'string | |
319 | :group 'outlines) | |
320 | ||
321 | ;;;###autoload | |
322 | (define-minor-mode outline-minor-mode | |
323 | "Toggle Outline minor mode. | |
324 | With arg, turn Outline minor mode on if arg is positive, off otherwise. | |
325 | See the command `outline-mode' for more information on this mode." | |
326 | nil " Outl" (list (cons [menu-bar] outline-minor-mode-menu-bar-map) | |
327 | (cons outline-minor-mode-prefix outline-mode-prefix-map)) | |
328 | :group 'outlines | |
329 | (if outline-minor-mode | |
330 | (progn | |
331 | ;; Turn off this mode if we change major modes. | |
332 | (add-hook 'change-major-mode-hook | |
333 | (lambda () (outline-minor-mode -1)) | |
334 | nil t) | |
335 | (set (make-local-variable 'line-move-ignore-invisible) t) | |
336 | ;; Cause use of ellipses for invisible text. | |
337 | (add-to-invisibility-spec '(outline . t))) | |
338 | (setq line-move-ignore-invisible nil) | |
339 | ;; Cause use of ellipses for invisible text. | |
340 | (remove-from-invisibility-spec '(outline . t)) | |
341 | ;; When turning off outline mode, get rid of any outline hiding. | |
342 | (show-all))) | |
343 | \f | |
344 | (defvar outline-level 'outline-level | |
345 | "*Function of no args to compute a header's nesting level in an outline. | |
346 | It can assume point is at the beginning of a header line and that the match | |
347 | data reflects the `outline-regexp'.") | |
348 | ||
349 | (defvar outline-heading-alist () | |
350 | "Alist associating a heading for every possible level. | |
351 | Each entry is of the form (HEADING . LEVEL). | |
352 | This alist is used two ways: to find the heading corresponding to | |
353 | a given level and to find the level of a given heading. | |
354 | If a mode or document needs several sets of outline headings (for example | |
355 | numbered and unnumbered sections), list them set by set and sorted by level | |
356 | within each set. For example in texinfo mode: | |
357 | ||
358 | (setq outline-heading-alist | |
359 | '((\"@chapter\" . 2) (\"@section\" . 3) (\"@subsection\" . 4) | |
360 | (\"@subsubsection\" . 5) | |
361 | (\"@unnumbered\" . 2) (\"@unnumberedsec\" . 3) | |
362 | (\"@unnumberedsubsec\" . 4) (\"@unnumberedsubsubsec\" . 5) | |
363 | (\"@appendix\" . 2) (\"@appendixsec\" . 3)... | |
364 | (\"@appendixsubsec\" . 4) (\"@appendixsubsubsec\" . 5) ..)) | |
365 | ||
366 | Instead of sorting the entries in each set, you can also separate the | |
367 | sets with nil.") | |
368 | (make-variable-buffer-local 'outline-heading-alist) | |
369 | ||
370 | ;; This used to count columns rather than characters, but that made ^L | |
371 | ;; appear to be at level 2 instead of 1. Columns would be better for | |
372 | ;; tab handling, but the default regexp doesn't use tabs, and anyone | |
373 | ;; who changes the regexp can also redefine the outline-level variable | |
374 | ;; as appropriate. | |
375 | (defun outline-level () | |
376 | "Return the depth to which a statement is nested in the outline. | |
377 | Point must be at the beginning of a header line. | |
378 | This is actually either the level specified in `outline-heading-alist' | |
379 | or else the number of characters matched by `outline-regexp'." | |
380 | (or (cdr (assoc (match-string 0) outline-heading-alist)) | |
381 | (- (match-end 0) (match-beginning 0)))) | |
382 | ||
383 | (defun outline-next-preface () | |
384 | "Skip forward to just before the next heading line. | |
385 | If there's no following heading line, stop before the newline | |
386 | at the end of the buffer." | |
387 | (if (re-search-forward (concat "\n\\(?:" outline-regexp "\\)") | |
388 | nil 'move) | |
389 | (goto-char (match-beginning 0))) | |
ca858c64 | 390 | (if (and (bolp) (or outline-blank-line (eobp)) (not (bobp))) |
36a77f37 JB |
391 | (forward-char -1))) |
392 | ||
393 | (defun outline-next-heading () | |
394 | "Move to the next (possibly invisible) heading line." | |
395 | (interactive) | |
396 | ;; Make sure we don't match the heading we're at. | |
397 | (if (and (bolp) (not (eobp))) (forward-char 1)) | |
398 | (if (re-search-forward (concat "^\\(?:" outline-regexp "\\)") | |
399 | nil 'move) | |
400 | (goto-char (match-beginning 0)))) | |
401 | ||
402 | (defun outline-previous-heading () | |
403 | "Move to the previous (possibly invisible) heading line." | |
404 | (interactive) | |
405 | (re-search-backward (concat "^\\(?:" outline-regexp "\\)") | |
406 | nil 'move)) | |
407 | ||
408 | (defsubst outline-invisible-p (&optional pos) | |
409 | "Non-nil if the character after point is invisible." | |
410 | (get-char-property (or pos (point)) 'invisible)) | |
411 | ||
412 | (defun outline-visible () | |
413 | (not (outline-invisible-p))) | |
414 | (make-obsolete 'outline-visible 'outline-invisible-p) | |
415 | ||
416 | (defun outline-back-to-heading (&optional invisible-ok) | |
417 | "Move to previous heading line, or beg of this line if it's a heading. | |
418 | Only visible heading lines are considered, unless INVISIBLE-OK is non-nil." | |
419 | (beginning-of-line) | |
420 | (or (outline-on-heading-p invisible-ok) | |
421 | (let (found) | |
422 | (save-excursion | |
423 | (while (not found) | |
424 | (or (re-search-backward (concat "^\\(?:" outline-regexp "\\)") | |
425 | nil t) | |
426 | (error "before first heading")) | |
427 | (setq found (and (or invisible-ok (not (outline-invisible-p))) | |
428 | (point))))) | |
429 | (goto-char found) | |
430 | found))) | |
431 | ||
432 | (defun outline-on-heading-p (&optional invisible-ok) | |
433 | "Return t if point is on a (visible) heading line. | |
434 | If INVISIBLE-OK is non-nil, an invisible heading line is ok too." | |
435 | (save-excursion | |
436 | (beginning-of-line) | |
437 | (and (bolp) (or invisible-ok (not (outline-invisible-p))) | |
438 | (looking-at outline-regexp)))) | |
439 | ||
440 | (defun outline-insert-heading () | |
441 | "Insert a new heading at same depth at point." | |
442 | (interactive) | |
443 | (let ((head (save-excursion | |
444 | (condition-case nil | |
445 | (outline-back-to-heading) | |
446 | (error (outline-next-heading))) | |
447 | (if (eobp) | |
448 | (or (caar outline-heading-alist) "") | |
449 | (match-string 0))))) | |
450 | (unless (or (string-match "[ \t]\\'" head) | |
f56af8ca SM |
451 | (not (string-match (concat "\\`\\(?:" outline-regexp "\\)") |
452 | (concat head " ")))) | |
36a77f37 JB |
453 | (setq head (concat head " "))) |
454 | (unless (bolp) (end-of-line) (newline)) | |
455 | (insert head) | |
456 | (unless (eolp) | |
457 | (save-excursion (newline-and-indent))) | |
458 | (run-hooks 'outline-insert-heading-hook))) | |
459 | ||
797d92ed SM |
460 | (defun outline-invent-heading (head up) |
461 | (save-match-data | |
462 | ;; Let's try to invent one by repeating or deleting the last char. | |
463 | (let ((new-head (if up (substring head 0 -1) | |
464 | (concat head (substring head -1))))) | |
465 | (if (string-match (concat "\\`\\(?:" outline-regexp "\\)") | |
466 | new-head) | |
467 | ;; Why bother checking that it is indeed higher/lower level ? | |
468 | new-head | |
469 | ;; Didn't work, so ask what to do. | |
470 | (read-string (format "%s heading for `%s': " | |
471 | (if up "Parent" "Demoted") head) | |
472 | head nil nil t))))) | |
473 | ||
36a77f37 JB |
474 | (defun outline-promote (&optional children) |
475 | "Promote headings higher up the tree. | |
476 | If prefix argument CHILDREN is given, promote also all the children. | |
477 | If the region is active in `transient-mark-mode', promote all headings | |
478 | in the region." | |
479 | (interactive | |
480 | (list (if (and transient-mark-mode mark-active) 'region | |
481 | (outline-back-to-heading) | |
482 | (if current-prefix-arg nil 'subtree)))) | |
483 | (cond | |
484 | ((eq children 'region) | |
485 | (outline-map-region 'outline-promote (region-beginning) (region-end))) | |
486 | (children | |
487 | (outline-map-region 'outline-promote | |
488 | (point) | |
489 | (save-excursion (outline-get-next-sibling) (point)))) | |
490 | (t | |
491 | (outline-back-to-heading t) | |
20e3210f | 492 | (let* ((head (match-string-no-properties 0)) |
36a77f37 JB |
493 | (level (save-match-data (funcall outline-level))) |
494 | (up-head (or (outline-head-from-level (1- level) head) | |
20e3210f RS |
495 | ;; Use the parent heading, if it is really |
496 | ;; one level less. | |
36a77f37 JB |
497 | (save-excursion |
498 | (save-match-data | |
499 | (outline-up-heading 1 t) | |
20e3210f RS |
500 | (and (= (1- level) (funcall outline-level)) |
501 | (match-string-no-properties 0)))) | |
797d92ed SM |
502 | ;; Bummer!! There is no lower level heading. |
503 | (outline-invent-heading head 'up)))) | |
48c9ce10 | 504 | |
36a77f37 JB |
505 | (unless (rassoc level outline-heading-alist) |
506 | (push (cons head level) outline-heading-alist)) | |
48c9ce10 | 507 | |
36a77f37 JB |
508 | (replace-match up-head nil t))))) |
509 | ||
510 | (defun outline-demote (&optional children) | |
511 | "Demote headings lower down the tree. | |
512 | If prefix argument CHILDREN is given, demote also all the children. | |
513 | If the region is active in `transient-mark-mode', demote all headings | |
514 | in the region." | |
515 | (interactive | |
516 | (list (if (and transient-mark-mode mark-active) 'region | |
517 | (outline-back-to-heading) | |
518 | (if current-prefix-arg nil 'subtree)))) | |
519 | (cond | |
520 | ((eq children 'region) | |
521 | (outline-map-region 'outline-demote (region-beginning) (region-end))) | |
522 | (children | |
523 | (outline-map-region 'outline-demote | |
524 | (point) | |
525 | (save-excursion (outline-get-next-sibling) (point)))) | |
526 | (t | |
20e3210f | 527 | (let* ((head (match-string-no-properties 0)) |
36a77f37 JB |
528 | (level (save-match-data (funcall outline-level))) |
529 | (down-head | |
530 | (or (outline-head-from-level (1+ level) head) | |
531 | (save-excursion | |
532 | (save-match-data | |
533 | (while (and (progn (outline-next-heading) (not (eobp))) | |
534 | (<= (funcall outline-level) level))) | |
535 | (when (eobp) | |
536 | ;; Try again from the beginning of the buffer. | |
537 | (goto-char (point-min)) | |
538 | (while (and (progn (outline-next-heading) (not (eobp))) | |
539 | (<= (funcall outline-level) level)))) | |
540 | (unless (eobp) | |
541 | (looking-at outline-regexp) | |
20e3210f | 542 | (match-string-no-properties 0)))) |
797d92ed SM |
543 | ;; Bummer!! There is no higher-level heading in the buffer. |
544 | (outline-invent-heading head nil)))) | |
36a77f37 | 545 | |
20e3210f RS |
546 | (unless (rassoc level outline-heading-alist) |
547 | (push (cons head level) outline-heading-alist)) | |
548 | (replace-match down-head nil t))))) | |
36a77f37 JB |
549 | |
550 | (defun outline-head-from-level (level head &optional alist) | |
551 | "Get new heading with level LEVEL from ALIST. | |
552 | If there are no such entries, return nil. | |
553 | ALIST defaults to `outline-heading-alist'. | |
554 | Similar to (car (rassoc LEVEL ALIST)). | |
555 | If there are several different entries with same new level, choose | |
556 | the one with the smallest distance to the assocation of HEAD in the alist. | |
557 | This makes it possible for promotion to work in modes with several | |
558 | independent sets of headings (numbered, unnumbered, appendix...)" | |
559 | (unless alist (setq alist outline-heading-alist)) | |
560 | (let ((l (rassoc level alist)) | |
561 | ll h hl l2 l2l) | |
562 | (cond | |
563 | ((null l) nil) | |
564 | ;; If there's no HEAD after L, any other entry for LEVEL after L | |
565 | ;; can't be much better than L. | |
566 | ((null (setq h (assoc head (setq ll (memq l alist))))) (car l)) | |
567 | ;; If there's no other entry for LEVEL, just keep L. | |
568 | ((null (setq l2 (rassoc level (cdr ll)))) (car l)) | |
569 | ;; Now we have L, L2, and H: see if L2 seems better than L. | |
570 | ;; If H is after L2, L2 is better. | |
571 | ((memq h (setq l2l (memq l2 (cdr ll)))) | |
572 | (outline-head-from-level level head l2l)) | |
573 | ;; Now we have H between L and L2. | |
574 | ;; If there's a separator between L and H, prefer L2. | |
575 | ((memq h (memq nil ll)) | |
576 | (outline-head-from-level level head l2l)) | |
577 | ;; If there's a separator between L2 and H, prefer L. | |
578 | ((memq l2 (memq nil (setq hl (memq h ll)))) (car l)) | |
579 | ;; No separator between L and L2, check the distance. | |
580 | ((< (* 2 (length hl)) (+ (length ll) (length l2l))) | |
581 | (outline-head-from-level level head l2l)) | |
582 | ;; If all else fails, just keep L. | |
583 | (t (car l))))) | |
584 | ||
585 | (defun outline-map-region (fun beg end) | |
586 | "Call FUN for every heading between BEG and END. | |
587 | When FUN is called, point is at the beginning of the heading and | |
588 | the match data is set appropriately." | |
589 | (save-excursion | |
590 | (setq end (copy-marker end)) | |
591 | (goto-char beg) | |
592 | (when (re-search-forward (concat "^\\(?:" outline-regexp "\\)") end t) | |
593 | (goto-char (match-beginning 0)) | |
594 | (funcall fun) | |
595 | (while (and (progn | |
596 | (outline-next-heading) | |
597 | (< (point) end)) | |
598 | (not (eobp))) | |
599 | (funcall fun))))) | |
600 | ||
601 | ;; Vertical tree motion | |
602 | ||
603 | (defun outline-move-subtree-up (&optional arg) | |
604 | "Move the currrent subtree up past ARG headlines of the same level." | |
605 | (interactive "p") | |
606 | (outline-move-subtree-down (- arg))) | |
607 | ||
608 | (defun outline-move-subtree-down (&optional arg) | |
609 | "Move the currrent subtree down past ARG headlines of the same level." | |
610 | (interactive "p") | |
797d92ed | 611 | (let ((movfunc (if (> arg 0) 'outline-get-next-sibling |
36a77f37 JB |
612 | 'outline-get-last-sibling)) |
613 | (ins-point (make-marker)) | |
614 | (cnt (abs arg)) | |
797d92ed | 615 | beg end folded) |
36a77f37 JB |
616 | ;; Select the tree |
617 | (outline-back-to-heading) | |
618 | (setq beg (point)) | |
48c9ce10 JB |
619 | (save-match-data |
620 | (save-excursion (outline-end-of-heading) | |
36a77f37 JB |
621 | (setq folded (outline-invisible-p))) |
622 | (outline-end-of-subtree)) | |
623 | (if (= (char-after) ?\n) (forward-char 1)) | |
624 | (setq end (point)) | |
625 | ;; Find insertion point, with error handling | |
626 | (goto-char beg) | |
627 | (while (> cnt 0) | |
628 | (or (funcall movfunc) | |
629 | (progn (goto-char beg) | |
630 | (error "Cannot move past superior level"))) | |
631 | (setq cnt (1- cnt))) | |
632 | (if (> arg 0) | |
633 | ;; Moving forward - still need to move over subtree | |
48c9ce10 | 634 | (progn (outline-end-of-subtree) |
36a77f37 JB |
635 | (if (= (char-after) ?\n) (forward-char 1)))) |
636 | (move-marker ins-point (point)) | |
637 | (insert (delete-and-extract-region beg end)) | |
638 | (goto-char ins-point) | |
639 | (if folded (hide-subtree)) | |
640 | (move-marker ins-point nil))) | |
641 | ||
642 | (defun outline-end-of-heading () | |
643 | (if (re-search-forward outline-heading-end-regexp nil 'move) | |
644 | (forward-char -1))) | |
645 | ||
646 | (defun outline-next-visible-heading (arg) | |
647 | "Move to the next visible heading line. | |
648 | With argument, repeats or can move backward if negative. | |
649 | A heading line is one that starts with a `*' (or that | |
650 | `outline-regexp' matches)." | |
651 | (interactive "p") | |
652 | (if (< arg 0) | |
653 | (beginning-of-line) | |
654 | (end-of-line)) | |
655 | (while (and (not (bobp)) (< arg 0)) | |
656 | (while (and (not (bobp)) | |
657 | (re-search-backward (concat "^\\(?:" outline-regexp "\\)") | |
658 | nil 'move) | |
659 | (outline-invisible-p))) | |
660 | (setq arg (1+ arg))) | |
661 | (while (and (not (eobp)) (> arg 0)) | |
662 | (while (and (not (eobp)) | |
663 | (re-search-forward (concat "^\\(?:" outline-regexp "\\)") | |
664 | nil 'move) | |
665 | (outline-invisible-p (match-beginning 0)))) | |
666 | (setq arg (1- arg))) | |
667 | (beginning-of-line)) | |
668 | ||
669 | (defun outline-previous-visible-heading (arg) | |
670 | "Move to the previous heading line. | |
671 | With argument, repeats or can move forward if negative. | |
672 | A heading line is one that starts with a `*' (or that | |
673 | `outline-regexp' matches)." | |
674 | (interactive "p") | |
675 | (outline-next-visible-heading (- arg))) | |
676 | ||
677 | (defun outline-mark-subtree () | |
678 | "Mark the current subtree in an outlined document. | |
679 | This puts point at the start of the current subtree, and mark at the end." | |
680 | (interactive) | |
681 | (let ((beg)) | |
682 | (if (outline-on-heading-p) | |
683 | ;; we are already looking at a heading | |
684 | (beginning-of-line) | |
685 | ;; else go back to previous heading | |
686 | (outline-previous-visible-heading 1)) | |
687 | (setq beg (point)) | |
688 | (outline-end-of-subtree) | |
d35b8a28 | 689 | (push-mark (point) nil t) |
36a77f37 JB |
690 | (goto-char beg))) |
691 | \f | |
692 | ||
693 | (put 'outline 'reveal-toggle-invisible 'outline-reveal-toggle-invisible) | |
694 | (defun outline-flag-region (from to flag) | |
695 | "Hide or show lines from FROM to TO, according to FLAG. | |
696 | If FLAG is nil then text is shown, while if FLAG is t the text is hidden." | |
697 | (remove-overlays from to 'invisible 'outline) | |
698 | (when flag | |
699 | (let ((o (make-overlay from to))) | |
700 | (overlay-put o 'invisible 'outline) | |
701 | (overlay-put o 'isearch-open-invisible 'outline-isearch-open-invisible))) | |
702 | ;; Seems only used by lazy-lock. I.e. obsolete. | |
703 | (run-hooks 'outline-view-change-hook)) | |
704 | ||
705 | (defun outline-reveal-toggle-invisible (o hidep) | |
706 | (save-excursion | |
707 | (goto-char (overlay-start o)) | |
708 | (if hidep | |
709 | ;; When hiding the area again, we could just clean it up and let | |
710 | ;; reveal do the rest, by simply doing: | |
711 | ;; (remove-overlays (overlay-start o) (overlay-end o) | |
712 | ;; 'invisible 'outline) | |
48c9ce10 | 713 | ;; |
36a77f37 JB |
714 | ;; That works fine as long as everything is in sync, but if the |
715 | ;; structure of the document is changed while revealing parts of it, | |
716 | ;; the resulting behavior can be ugly. I.e. we need to make | |
717 | ;; sure that we hide exactly a subtree. | |
718 | (progn | |
719 | (let ((end (overlay-end o))) | |
720 | (delete-overlay o) | |
721 | (while (progn | |
722 | (hide-subtree) | |
723 | (outline-next-visible-heading 1) | |
724 | (and (not (eobp)) (< (point) end)))))) | |
725 | ||
726 | ;; When revealing, we just need to reveal sublevels. If point is | |
727 | ;; inside one of the sublevels, reveal will call us again. | |
728 | ;; But we need to preserve the original overlay. | |
729 | (let ((o1 (copy-overlay o))) | |
730 | (overlay-put o 'invisible nil) ;Show (most of) the text. | |
731 | (while (progn | |
732 | (show-entry) | |
733 | (show-children) | |
734 | ;; Normally just the above is needed. | |
735 | ;; But in odd cases, the above might fail to show anything. | |
736 | ;; To avoid an infinite loop, we have to make sure that | |
737 | ;; *something* gets shown. | |
738 | (and (equal (overlay-start o) (overlay-start o1)) | |
739 | (< (point) (overlay-end o)) | |
740 | (= 0 (forward-line 1))))) | |
741 | ;; If still nothing was shown, just kill the damn thing. | |
742 | (when (equal (overlay-start o) (overlay-start o1)) | |
743 | ;; I've seen it happen at the end of buffer. | |
744 | (delete-overlay o1)))))) | |
745 | ||
746 | ;; Function to be set as an outline-isearch-open-invisible' property | |
747 | ;; to the overlay that makes the outline invisible (see | |
748 | ;; `outline-flag-region'). | |
749 | (defun outline-isearch-open-invisible (overlay) | |
750 | ;; We rely on the fact that isearch places point on the matched text. | |
751 | (show-entry)) | |
752 | \f | |
753 | (defun hide-entry () | |
754 | "Hide the body directly following this heading." | |
755 | (interactive) | |
36a77f37 | 756 | (save-excursion |
c95502be | 757 | (outline-back-to-heading) |
e4619728 | 758 | (outline-end-of-heading) |
36a77f37 JB |
759 | (outline-flag-region (point) (progn (outline-next-preface) (point)) t))) |
760 | ||
761 | (defun show-entry () | |
762 | "Show the body directly following this heading. | |
763 | Show the heading too, if it is currently invisible." | |
764 | (interactive) | |
765 | (save-excursion | |
766 | (outline-back-to-heading t) | |
767 | (outline-flag-region (1- (point)) | |
768 | (progn (outline-next-preface) (point)) nil))) | |
769 | ||
770 | (defun hide-body () | |
00958fa2 | 771 | "Hide all body lines in buffer, leaving all headings visible." |
36a77f37 JB |
772 | (interactive) |
773 | (hide-region-body (point-min) (point-max))) | |
774 | ||
775 | (defun hide-region-body (start end) | |
776 | "Hide all body lines in the region, but not headings." | |
777 | ;; Nullify the hook to avoid repeated calls to `outline-flag-region' | |
778 | ;; wasting lots of time running `lazy-lock-fontify-after-outline' | |
779 | ;; and run the hook finally. | |
780 | (let (outline-view-change-hook) | |
781 | (save-excursion | |
782 | (save-restriction | |
783 | (narrow-to-region start end) | |
784 | (goto-char (point-min)) | |
785 | (if (outline-on-heading-p) | |
00958fa2 EZ |
786 | (outline-end-of-heading) |
787 | (outline-next-preface)) | |
36a77f37 JB |
788 | (while (not (eobp)) |
789 | (outline-flag-region (point) | |
790 | (progn (outline-next-preface) (point)) t) | |
791 | (unless (eobp) | |
792 | (forward-char (if (looking-at "\n\n") 2 1)) | |
793 | (outline-end-of-heading)))))) | |
794 | (run-hooks 'outline-view-change-hook)) | |
795 | ||
796 | (defun show-all () | |
797 | "Show all of the text in the buffer." | |
798 | (interactive) | |
799 | (outline-flag-region (point-min) (point-max) nil)) | |
800 | ||
801 | (defun hide-subtree () | |
802 | "Hide everything after this heading at deeper levels." | |
803 | (interactive) | |
804 | (outline-flag-subtree t)) | |
805 | ||
806 | (defun hide-leaves () | |
d8b5b5d5 | 807 | "Hide the body after this heading and at deeper levels." |
36a77f37 | 808 | (interactive) |
36a77f37 | 809 | (save-excursion |
c95502be | 810 | (outline-back-to-heading) |
4af23f81 | 811 | ;; Turned off to fix bug reported by Otto Maddox on 22 Nov 2005. |
d8b5b5d5 | 812 | ;; (outline-end-of-heading) |
36a77f37 JB |
813 | (hide-region-body (point) (progn (outline-end-of-subtree) (point))))) |
814 | ||
815 | (defun show-subtree () | |
816 | "Show everything after this heading at deeper levels." | |
817 | (interactive) | |
818 | (outline-flag-subtree nil)) | |
819 | ||
820 | (defun outline-show-heading () | |
821 | "Show the current heading and move to its end." | |
ca858c64 JL |
822 | (outline-flag-region (- (point) |
823 | (if (bobp) 0 | |
824 | (if (and outline-blank-line | |
825 | (eq (char-before (1- (point))) ?\n)) | |
826 | 2 1))) | |
36a77f37 JB |
827 | (progn (outline-end-of-heading) (point)) |
828 | nil)) | |
829 | ||
830 | (defun hide-sublevels (levels) | |
831 | "Hide everything but the top LEVELS levels of headers, in whole buffer." | |
1e0e9b38 SM |
832 | (interactive (list |
833 | (cond | |
834 | (current-prefix-arg (prefix-numeric-value current-prefix-arg)) | |
835 | ((save-excursion (beginning-of-line) | |
836 | (looking-at outline-regexp)) | |
837 | (funcall outline-level)) | |
838 | (t 1)))) | |
36a77f37 JB |
839 | (if (< levels 1) |
840 | (error "Must keep at least one level of headers")) | |
841 | (let (outline-view-change-hook) | |
842 | (save-excursion | |
843 | (goto-char (point-min)) | |
844 | ;; Skip the prelude, if any. | |
845 | (unless (outline-on-heading-p t) (outline-next-heading)) | |
846 | ;; First hide everything. | |
847 | (outline-flag-region (point) (point-max) t) | |
848 | ;; Then unhide the top level headers. | |
849 | (outline-map-region | |
850 | (lambda () | |
851 | (if (<= (funcall outline-level) levels) | |
852 | (outline-show-heading))) | |
853 | (point) (point-max)))) | |
854 | (run-hooks 'outline-view-change-hook)) | |
855 | ||
856 | (defun hide-other () | |
857 | "Hide everything except current body and parent and top-level headings." | |
858 | (interactive) | |
859 | (hide-sublevels 1) | |
860 | (let (outline-view-change-hook) | |
861 | (save-excursion | |
862 | (outline-back-to-heading t) | |
863 | (show-entry) | |
6e32922d | 864 | (while (condition-case nil (progn (outline-up-heading 1 t) (not (bobp))) |
36a77f37 JB |
865 | (error nil)) |
866 | (outline-flag-region (1- (point)) | |
867 | (save-excursion (forward-line 1) (point)) | |
868 | nil)))) | |
869 | (run-hooks 'outline-view-change-hook)) | |
870 | ||
871 | (defun outline-toggle-children () | |
872 | "Show or hide the current subtree depending on its current state." | |
873 | (interactive) | |
c95502be JL |
874 | (save-excursion |
875 | (outline-back-to-heading) | |
876 | (if (not (outline-invisible-p (line-end-position))) | |
877 | (hide-subtree) | |
878 | (show-children) | |
879 | (show-entry)))) | |
36a77f37 JB |
880 | |
881 | (defun outline-flag-subtree (flag) | |
882 | (save-excursion | |
883 | (outline-back-to-heading) | |
884 | (outline-end-of-heading) | |
885 | (outline-flag-region (point) | |
886 | (progn (outline-end-of-subtree) (point)) | |
887 | flag))) | |
888 | ||
889 | (defun outline-end-of-subtree () | |
890 | (outline-back-to-heading) | |
797d92ed | 891 | (let ((first t) |
36a77f37 JB |
892 | (level (funcall outline-level))) |
893 | (while (and (not (eobp)) | |
894 | (or first (> (funcall outline-level) level))) | |
895 | (setq first nil) | |
896 | (outline-next-heading)) | |
49bb7f01 RS |
897 | (if (and (bolp) (not (eolp))) |
898 | ;; We stopped at a nonempty line (the next heading). | |
36a77f37 JB |
899 | (progn |
900 | ;; Go to end of line before heading | |
ca858c64 JL |
901 | (forward-char -1) |
902 | (if (and outline-blank-line (bolp)) | |
903 | ;; leave blank line before heading | |
904 | (forward-char -1)))))) | |
36a77f37 JB |
905 | \f |
906 | (defun show-branches () | |
907 | "Show all subheadings of this heading, but not their bodies." | |
908 | (interactive) | |
909 | (show-children 1000)) | |
910 | ||
911 | (defun show-children (&optional level) | |
912 | "Show all direct subheadings of this heading. | |
913 | Prefix arg LEVEL is how many levels below the current level should be shown. | |
914 | Default is enough to cause the following heading to appear." | |
915 | (interactive "P") | |
916 | (setq level | |
917 | (if level (prefix-numeric-value level) | |
918 | (save-excursion | |
919 | (outline-back-to-heading) | |
920 | (let ((start-level (funcall outline-level))) | |
921 | (outline-next-heading) | |
922 | (if (eobp) | |
923 | 1 | |
924 | (max 1 (- (funcall outline-level) start-level))))))) | |
925 | (let (outline-view-change-hook) | |
926 | (save-excursion | |
927 | (outline-back-to-heading) | |
928 | (setq level (+ level (funcall outline-level))) | |
929 | (outline-map-region | |
930 | (lambda () | |
931 | (if (<= (funcall outline-level) level) | |
932 | (outline-show-heading))) | |
933 | (point) | |
934 | (progn (outline-end-of-subtree) | |
935 | (if (eobp) (point-max) (1+ (point))))))) | |
936 | (run-hooks 'outline-view-change-hook)) | |
937 | ||
938 | \f | |
939 | ||
940 | (defun outline-up-heading (arg &optional invisible-ok) | |
941 | "Move to the visible heading line of which the present line is a subheading. | |
942 | With argument, move up ARG levels. | |
943 | If INVISIBLE-OK is non-nil, also consider invisible lines." | |
944 | (interactive "p") | |
e4619728 JL |
945 | (and (eq this-command 'outline-up-heading) |
946 | (or (eq last-command 'outline-up-heading) (push-mark))) | |
36a77f37 JB |
947 | (outline-back-to-heading invisible-ok) |
948 | (let ((start-level (funcall outline-level))) | |
949 | (if (eq start-level 1) | |
950 | (error "Already at top level of the outline")) | |
951 | (while (and (> start-level 1) (> arg 0) (not (bobp))) | |
952 | (let ((level start-level)) | |
953 | (while (not (or (< level start-level) (bobp))) | |
954 | (if invisible-ok | |
955 | (outline-previous-heading) | |
956 | (outline-previous-visible-heading 1)) | |
957 | (setq level (funcall outline-level))) | |
958 | (setq start-level level)) | |
959 | (setq arg (- arg 1)))) | |
960 | (looking-at outline-regexp)) | |
961 | ||
962 | (defun outline-forward-same-level (arg) | |
963 | "Move forward to the ARG'th subheading at same level as this one. | |
964 | Stop at the first and last subheadings of a superior heading." | |
965 | (interactive "p") | |
966 | (outline-back-to-heading) | |
967 | (while (> arg 0) | |
968 | (let ((point-to-move-to (save-excursion | |
969 | (outline-get-next-sibling)))) | |
970 | (if point-to-move-to | |
971 | (progn | |
972 | (goto-char point-to-move-to) | |
973 | (setq arg (1- arg))) | |
974 | (progn | |
975 | (setq arg 0) | |
976 | (error "No following same-level heading")))))) | |
977 | ||
978 | (defun outline-get-next-sibling () | |
979 | "Move to next heading of the same level, and return point or nil if none." | |
980 | (let ((level (funcall outline-level))) | |
981 | (outline-next-visible-heading 1) | |
982 | (while (and (not (eobp)) (> (funcall outline-level) level)) | |
983 | (outline-next-visible-heading 1)) | |
984 | (if (or (eobp) (< (funcall outline-level) level)) | |
985 | nil | |
986 | (point)))) | |
987 | ||
988 | (defun outline-backward-same-level (arg) | |
989 | "Move backward to the ARG'th subheading at same level as this one. | |
990 | Stop at the first and last subheadings of a superior heading." | |
991 | (interactive "p") | |
992 | (outline-back-to-heading) | |
993 | (while (> arg 0) | |
994 | (let ((point-to-move-to (save-excursion | |
995 | (outline-get-last-sibling)))) | |
996 | (if point-to-move-to | |
997 | (progn | |
998 | (goto-char point-to-move-to) | |
999 | (setq arg (1- arg))) | |
1000 | (progn | |
1001 | (setq arg 0) | |
1002 | (error "No previous same-level heading")))))) | |
1003 | ||
1004 | (defun outline-get-last-sibling () | |
1005 | "Move to previous heading of the same level, and return point or nil if none." | |
1006 | (let ((level (funcall outline-level))) | |
1007 | (outline-previous-visible-heading 1) | |
1008 | (while (and (> (funcall outline-level) level) | |
1009 | (not (bobp))) | |
1010 | (outline-previous-visible-heading 1)) | |
1011 | (if (< (funcall outline-level) level) | |
1012 | nil | |
1013 | (point)))) | |
1014 | \f | |
1015 | (defun outline-headers-as-kill (beg end) | |
1016 | "Save the visible outline headers in region at the start of the kill ring. | |
1017 | ||
1018 | Text shown between the headers isn't copied. Two newlines are | |
1019 | inserted between saved headers. Yanking the result may be a | |
1020 | convenient way to make a table of contents of the buffer." | |
1021 | (interactive "r") | |
1022 | (save-excursion | |
1023 | (save-restriction | |
1024 | (narrow-to-region beg end) | |
1025 | (goto-char (point-min)) | |
1026 | (let ((buffer (current-buffer)) | |
1027 | start end) | |
1028 | (with-temp-buffer | |
1029 | (with-current-buffer buffer | |
1030 | ;; Boundary condition: starting on heading: | |
1031 | (when (outline-on-heading-p) | |
1032 | (outline-back-to-heading) | |
1033 | (setq start (point) | |
1034 | end (progn (outline-end-of-heading) | |
1035 | (point))) | |
1036 | (insert-buffer-substring buffer start end) | |
1037 | (insert "\n\n"))) | |
1038 | (let ((temp-buffer (current-buffer))) | |
1039 | (with-current-buffer buffer | |
1040 | (while (outline-next-heading) | |
1041 | (unless (outline-invisible-p) | |
1042 | (setq start (point) | |
1043 | end (progn (outline-end-of-heading) (point))) | |
1044 | (with-current-buffer temp-buffer | |
1045 | (insert-buffer-substring buffer start end) | |
1046 | (insert "\n\n")))))) | |
1047 | (kill-new (buffer-string))))))) | |
1048 | ||
1049 | (provide 'outline) | |
1050 | (provide 'noutline) | |
1051 | ||
797d92ed | 1052 | ;; arch-tag: 1724410e-7d4d-4f46-b801-49e18171e874 |
36a77f37 | 1053 | ;;; outline.el ends here |