Commit | Line | Data |
---|---|---|
6594deb0 ER |
1 | ;;; outline.el --- outline mode commands for Emacs |
2 | ||
476731da | 3 | ;; Copyright (C) 1986, 1993 Free Software Foundation, Inc. |
26d1e4fd | 4 | |
3fa26c50 RS |
5 | ;; 7-Feb-94 Kevin Broadey |
6 | ;; Fix show-children so it doesn't try to narrow to (1+ (point-max)) when | |
7 | ;; exposing the last level-n header in the buffer. | |
8 | ;; | |
9750e079 ER |
9 | ;; Maintainer: FSF |
10 | ||
26d1e4fd BP |
11 | ;; This file is part of GNU Emacs. |
12 | ||
13 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
14 | ;; it under the terms of the GNU General Public License as published by | |
e5167999 | 15 | ;; the Free Software Foundation; either version 2, or (at your option) |
26d1e4fd BP |
16 | ;; any later version. |
17 | ||
18 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
19 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | ;; GNU General Public License for more details. | |
22 | ||
23 | ;; You should have received a copy of the GNU General Public License | |
24 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
25 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
26 | ||
edbd2f74 ER |
27 | ;;; Commentary: |
28 | ||
29 | ;; This package is a major mode for editing outline-format documents. | |
30 | ;; An outline can be `abstracted' to show headers at any given level, | |
31 | ;; with all stuff below hidden. See the Emacs manual for details. | |
32 | ||
e5167999 ER |
33 | ;;; Code: |
34 | ||
26d1e4fd BP |
35 | ;; Jan '86, Some new features added by Peter Desnoyers and rewritten by RMS. |
36 | ||
37 | (defvar outline-regexp "[*\^l]+" | |
38 | "*Regular expression to match the beginning of a heading. | |
39 | Any line whose beginning matches this regexp is considered to start a heading. | |
40 | The recommended way to set this is with a Local Variables: list | |
41 | in the file it applies to. See also outline-heading-end-regexp.") | |
42 | ||
8f1e8ff0 | 43 | (defvar outline-heading-end-regexp "[\n\^M]" |
26d1e4fd BP |
44 | "*Regular expression to match the end of a heading line. |
45 | You can assume that point is at the beginning of a heading when this | |
46 | regexp is searched for. The heading ends at the end of the match. | |
47 | The recommended way to set this is with a \"Local Variables:\" list | |
48 | in the file it applies to.") | |
49 | ||
50 | (defvar outline-mode-map nil "") | |
51 | ||
52 | (if outline-mode-map | |
53 | nil | |
54 | (setq outline-mode-map (nconc (make-sparse-keymap) text-mode-map)) | |
55 | (define-key outline-mode-map "\C-c\C-n" 'outline-next-visible-heading) | |
56 | (define-key outline-mode-map "\C-c\C-p" 'outline-previous-visible-heading) | |
57 | (define-key outline-mode-map "\C-c\C-i" 'show-children) | |
58 | (define-key outline-mode-map "\C-c\C-s" 'show-subtree) | |
384fc6ca | 59 | (define-key outline-mode-map "\C-c\C-d" 'hide-subtree) |
26d1e4fd BP |
60 | (define-key outline-mode-map "\C-c\C-u" 'outline-up-heading) |
61 | (define-key outline-mode-map "\C-c\C-f" 'outline-forward-same-level) | |
ee1a4f84 | 62 | (define-key outline-mode-map "\C-c\C-b" 'outline-backward-same-level) |
9e9afbf8 RS |
63 | (define-key outline-mode-map "\C-c\C-t" 'hide-body) |
64 | (define-key outline-mode-map "\C-c\C-a" 'show-all) | |
65 | (define-key outline-mode-map "\C-c\C-c" 'hide-entry) | |
66 | (define-key outline-mode-map "\C-c\C-e" 'show-entry) | |
67 | (define-key outline-mode-map "\C-c\C-l" 'hide-leaves) | |
68 | (define-key outline-mode-map "\C-c\C-k" 'show-branches) | |
69 | (define-key outline-mode-map "\C-c\C-q" 'outline-hide-sublevels) | |
70 | (define-key outline-mode-map "\C-c\C-o" 'outline-hide-other) | |
ee1a4f84 RS |
71 | |
72 | (define-key outline-mode-map [menu-bar hide] | |
73 | (cons "Hide" (make-sparse-keymap "Hide"))) | |
74 | ||
9e9afbf8 RS |
75 | (define-key outline-mode-map [menu-bar hide hide-other] |
76 | '("Hide Other" . outline-hide-other)) | |
77 | (define-key outline-mode-map [menu-bar hide hide-sublevels] | |
78 | '("Hide Sublevels" . outline-hide-sublevels)) | |
ee1a4f84 | 79 | (define-key outline-mode-map [menu-bar hide hide-subtree] |
32e61280 | 80 | '("Hide Subtree" . hide-subtree)) |
ee1a4f84 | 81 | (define-key outline-mode-map [menu-bar hide hide-entry] |
32e61280 | 82 | '("Hide Entry" . hide-entry)) |
ee1a4f84 | 83 | (define-key outline-mode-map [menu-bar hide hide-body] |
32e61280 | 84 | '("Hide Body" . hide-body)) |
ee1a4f84 | 85 | (define-key outline-mode-map [menu-bar hide hide-leaves] |
32e61280 | 86 | '("Hide Leaves" . hide-leaves)) |
ee1a4f84 RS |
87 | |
88 | (define-key outline-mode-map [menu-bar show] | |
89 | (cons "Show" (make-sparse-keymap "Show"))) | |
90 | ||
91 | (define-key outline-mode-map [menu-bar show show-subtree] | |
32e61280 | 92 | '("Show Subtree" . show-subtree)) |
ee1a4f84 | 93 | (define-key outline-mode-map [menu-bar show show-children] |
32e61280 | 94 | '("Show Children" . show-children)) |
ee1a4f84 | 95 | (define-key outline-mode-map [menu-bar show show-branches] |
32e61280 | 96 | '("Show Branches" . show-branches)) |
ee1a4f84 | 97 | (define-key outline-mode-map [menu-bar show show-entry] |
32e61280 | 98 | '("Show Entry" . show-entry)) |
ee1a4f84 | 99 | (define-key outline-mode-map [menu-bar show show-all] |
32e61280 | 100 | '("Show All" . show-all)) |
ee1a4f84 RS |
101 | |
102 | (define-key outline-mode-map [menu-bar headings] | |
103 | (cons "Headings" (make-sparse-keymap "Headings"))) | |
104 | ||
105 | (define-key outline-mode-map [menu-bar headings outline-backward-same-level] | |
106 | '("Previous Same Level" . outline-backward-same-level)) | |
107 | (define-key outline-mode-map [menu-bar headings outline-forward-same-level] | |
108 | '("Next Same Level" . outline-forward-same-level)) | |
109 | (define-key outline-mode-map [menu-bar headings outline-previous-visible-heading] | |
110 | '("Previous" . outline-previous-visible-heading)) | |
111 | (define-key outline-mode-map [menu-bar headings outline-next-visible-heading] | |
112 | '("Next" . outline-next-visible-heading)) | |
113 | (define-key outline-mode-map [menu-bar headings outline-up-heading] | |
114 | '("Up" . outline-up-heading))) | |
26d1e4fd BP |
115 | |
116 | (defvar outline-minor-mode nil | |
117 | "Non-nil if using Outline mode as a minor mode of some other mode.") | |
326c43dc RS |
118 | (make-variable-buffer-local 'outline-minor-mode) |
119 | (put 'outline-minor-mode 'permanent-local t) | |
8f22b9e0 RS |
120 | (or (assq 'outline-minor-mode minor-mode-alist) |
121 | (setq minor-mode-alist (append minor-mode-alist | |
122 | (list '(outline-minor-mode " Outl"))))) | |
26d1e4fd | 123 | |
f9f9507e | 124 | ;;;###autoload |
26d1e4fd BP |
125 | (defun outline-mode () |
126 | "Set major mode for editing outlines with selective display. | |
127 | Headings are lines which start with asterisks: one for major headings, | |
128 | two for subheadings, etc. Lines not starting with asterisks are body lines. | |
129 | ||
130 | Body text or subheadings under a heading can be made temporarily | |
131 | invisible, or visible again. Invisible lines are attached to the end | |
132 | of the heading, so they move with it, if the line is killed and yanked | |
133 | back. A heading with text hidden under it is marked with an ellipsis (...). | |
134 | ||
135 | Commands:\\<outline-mode-map> | |
136 | \\[outline-next-visible-heading] outline-next-visible-heading move by visible headings | |
137 | \\[outline-previous-visible-heading] outline-previous-visible-heading | |
138 | \\[outline-forward-same-level] outline-forward-same-level similar but skip subheadings | |
139 | \\[outline-backward-same-level] outline-backward-same-level | |
140 | \\[outline-up-heading] outline-up-heading move from subheading to heading | |
141 | ||
142 | M-x hide-body make all text invisible (not headings). | |
143 | M-x show-all make everything in buffer visible. | |
144 | ||
145 | The remaining commands are used when point is on a heading line. | |
146 | They apply to some of the body or subheadings of that heading. | |
147 | \\[hide-subtree] hide-subtree make body and subheadings invisible. | |
148 | \\[show-subtree] show-subtree make body and subheadings visible. | |
149 | \\[show-children] show-children make direct subheadings visible. | |
150 | No effect on body, or subheadings 2 or more levels down. | |
151 | With arg N, affects subheadings N levels down. | |
152 | M-x hide-entry make immediately following body invisible. | |
153 | M-x show-entry make it visible. | |
154 | M-x hide-leaves make body under heading and under its subheadings invisible. | |
155 | The subheadings remain visible. | |
156 | M-x show-branches make all subheadings at all levels visible. | |
157 | ||
158 | The variable `outline-regexp' can be changed to control what is a heading. | |
159 | A line is a heading if `outline-regexp' matches something at the | |
160 | beginning of the line. The longer the match, the deeper the level. | |
161 | ||
162 | Turning on outline mode calls the value of `text-mode-hook' and then of | |
163 | `outline-mode-hook', if they are non-nil." | |
164 | (interactive) | |
165 | (kill-all-local-variables) | |
166 | (setq selective-display t) | |
167 | (use-local-map outline-mode-map) | |
168 | (setq mode-name "Outline") | |
169 | (setq major-mode 'outline-mode) | |
170 | (define-abbrev-table 'text-mode-abbrev-table ()) | |
171 | (setq local-abbrev-table text-mode-abbrev-table) | |
172 | (set-syntax-table text-mode-syntax-table) | |
173 | (make-local-variable 'paragraph-start) | |
174 | (setq paragraph-start (concat paragraph-start "\\|^\\(" | |
175 | outline-regexp "\\)")) | |
176 | ;; Inhibit auto-filling of header lines. | |
177 | (make-local-variable 'auto-fill-inhibit-regexp) | |
178 | (setq auto-fill-inhibit-regexp outline-regexp) | |
179 | (make-local-variable 'paragraph-separate) | |
180 | (setq paragraph-separate (concat paragraph-separate "\\|^\\(" | |
181 | outline-regexp "\\)")) | |
9ea9bca3 | 182 | (add-hook 'change-major-mode-hook 'show-all) |
26d1e4fd BP |
183 | (run-hooks 'text-mode-hook 'outline-mode-hook)) |
184 | ||
9e9afbf8 | 185 | (defvar outline-minor-mode-prefix "\C-c\C-o" |
6e301d24 RS |
186 | "*Prefix key to use for Outline commands in Outline minor mode.") |
187 | ||
8f1e8ff0 RS |
188 | (defvar outline-minor-mode-map nil) |
189 | (if outline-minor-mode-map | |
190 | nil | |
191 | (setq outline-minor-mode-map (make-sparse-keymap)) | |
ee1a4f84 RS |
192 | (define-key outline-minor-mode-map [menu-bar] |
193 | (lookup-key outline-mode-map [menu-bar])) | |
6e301d24 | 194 | (define-key outline-minor-mode-map outline-minor-mode-prefix |
8f1e8ff0 RS |
195 | (lookup-key outline-mode-map "\C-c"))) |
196 | ||
197 | (or (assq 'outline-minor-mode minor-mode-map-alist) | |
198 | (setq minor-mode-map-alist | |
199 | (cons (cons 'outline-minor-mode outline-minor-mode-map) | |
200 | minor-mode-map-alist))) | |
201 | ||
34060080 | 202 | ;;;###autoload |
8f1e8ff0 | 203 | (defun outline-minor-mode (&optional arg) |
326c43dc RS |
204 | "Toggle Outline minor mode. |
205 | With arg, turn Outline minor mode on if arg is positive, off otherwise. | |
206 | See the command `outline-mode' for more information on this mode." | |
26d1e4fd BP |
207 | (interactive "P") |
208 | (setq outline-minor-mode | |
209 | (if (null arg) (not outline-minor-mode) | |
210 | (> (prefix-numeric-value arg) 0))) | |
211 | (if outline-minor-mode | |
212 | (progn | |
213 | (setq selective-display t) | |
26d1e4fd | 214 | (run-hooks 'outline-minor-mode-hook)) |
671e87b3 | 215 | (setq selective-display nil)) |
85111db5 RS |
216 | ;; When turning off outline mode, get rid of any ^M's. |
217 | (or outline-minor-mode | |
218 | (outline-flag-region (point-min) (point-max) ?\n)) | |
671e87b3 | 219 | (set-buffer-modified-p (buffer-modified-p))) |
26d1e4fd | 220 | \f |
476731da RS |
221 | (defvar outline-level 'outline-level |
222 | "Function of no args to compute a header's nesting level in an outline. | |
223 | It can assume point is at the beginning of a header line.") | |
224 | ||
26d1e4fd BP |
225 | (defun outline-level () |
226 | "Return the depth to which a statement is nested in the outline. | |
227 | Point must be at the beginning of a header line. This is actually | |
228 | the column number of the end of what `outline-regexp matches'." | |
229 | (save-excursion | |
230 | (looking-at outline-regexp) | |
231 | (save-excursion (goto-char (match-end 0)) (current-column)))) | |
232 | ||
233 | (defun outline-next-preface () | |
234 | "Skip forward to just before the next heading line." | |
235 | (if (re-search-forward (concat "[\n\^M]\\(" outline-regexp "\\)") | |
236 | nil 'move) | |
c1eaf68c RS |
237 | (progn |
238 | (goto-char (match-beginning 0)) | |
239 | (if (memq (preceding-char) '(?\n ?\^M)) | |
240 | (forward-char -1))))) | |
26d1e4fd BP |
241 | |
242 | (defun outline-next-heading () | |
243 | "Move to the next (possibly invisible) heading line." | |
244 | (interactive) | |
245 | (if (re-search-forward (concat "[\n\^M]\\(" outline-regexp "\\)") | |
246 | nil 'move) | |
247 | (goto-char (1+ (match-beginning 0))))) | |
248 | ||
249 | (defun outline-back-to-heading () | |
c1eaf68c RS |
250 | "Move to previous heading line, or beg of this line if it's a heading. |
251 | Only visible heading lines are considered." | |
26d1e4fd BP |
252 | (beginning-of-line) |
253 | (or (outline-on-heading-p) | |
254 | (re-search-backward (concat "^\\(" outline-regexp "\\)") nil 'move))) | |
255 | ||
256 | (defun outline-on-heading-p () | |
c1eaf68c | 257 | "Return T if point is on a (visible) heading line." |
26d1e4fd BP |
258 | (save-excursion |
259 | (beginning-of-line) | |
c1eaf68c | 260 | (and (bobp) |
26d1e4fd BP |
261 | (looking-at outline-regexp)))) |
262 | ||
263 | (defun outline-end-of-heading () | |
264 | (if (re-search-forward outline-heading-end-regexp nil 'move) | |
265 | (forward-char -1))) | |
266 | ||
267 | (defun outline-next-visible-heading (arg) | |
268 | "Move to the next visible heading line. | |
269 | With argument, repeats or can move backward if negative. | |
270 | A heading line is one that starts with a `*' (or that | |
271 | `outline-regexp' matches)." | |
272 | (interactive "p") | |
273 | (if (< arg 0) | |
274 | (beginning-of-line) | |
275 | (end-of-line)) | |
276 | (re-search-forward (concat "^\\(" outline-regexp "\\)") nil nil arg) | |
277 | (beginning-of-line)) | |
278 | ||
279 | (defun outline-previous-visible-heading (arg) | |
280 | "Move to the previous heading line. | |
281 | With argument, repeats or can move forward if negative. | |
282 | A heading line is one that starts with a `*' (or that | |
283 | `outline-regexp' matches)." | |
284 | (interactive "p") | |
285 | (outline-next-visible-heading (- arg))) | |
286 | ||
287 | (defun outline-flag-region (from to flag) | |
288 | "Hides or shows lines from FROM to TO, according to FLAG. | |
289 | If FLAG is `\\n' (newline character) then text is shown, | |
290 | while if FLAG is `\\^M' (control-M) the text is hidden." | |
05cf4426 RS |
291 | (let (buffer-read-only) |
292 | (subst-char-in-region from to | |
293 | (if (= flag ?\n) ?\^M ?\n) | |
294 | flag t))) | |
26d1e4fd BP |
295 | \f |
296 | (defun hide-entry () | |
297 | "Hide the body directly following this heading." | |
298 | (interactive) | |
299 | (outline-back-to-heading) | |
300 | (outline-end-of-heading) | |
301 | (save-excursion | |
302 | (outline-flag-region (point) (progn (outline-next-preface) (point)) ?\^M))) | |
303 | ||
304 | (defun show-entry () | |
305 | "Show the body directly following this heading." | |
306 | (interactive) | |
307 | (save-excursion | |
308 | (outline-flag-region (point) (progn (outline-next-preface) (point)) ?\n))) | |
309 | ||
310 | (defun hide-body () | |
311 | "Hide all of buffer except headings." | |
312 | (interactive) | |
313 | (hide-region-body (point-min) (point-max))) | |
314 | ||
315 | (defun hide-region-body (start end) | |
316 | "Hide all body lines in the region, but not headings." | |
317 | (save-excursion | |
318 | (save-restriction | |
319 | (narrow-to-region start end) | |
320 | (goto-char (point-min)) | |
321 | (if (outline-on-heading-p) | |
322 | (outline-end-of-heading)) | |
323 | (while (not (eobp)) | |
324 | (outline-flag-region (point) | |
325 | (progn (outline-next-preface) (point)) ?\^M) | |
326 | (if (not (eobp)) | |
327 | (progn | |
328 | (forward-char | |
329 | (if (looking-at "[\n\^M][\n\^M]") | |
330 | 2 1)) | |
331 | (outline-end-of-heading))))))) | |
332 | ||
333 | (defun show-all () | |
334 | "Show all of the text in the buffer." | |
335 | (interactive) | |
336 | (outline-flag-region (point-min) (point-max) ?\n)) | |
337 | ||
338 | (defun hide-subtree () | |
339 | "Hide everything after this heading at deeper levels." | |
340 | (interactive) | |
341 | (outline-flag-subtree ?\^M)) | |
342 | ||
343 | (defun hide-leaves () | |
344 | "Hide all body after this heading at deeper levels." | |
345 | (interactive) | |
346 | (outline-back-to-heading) | |
347 | (outline-end-of-heading) | |
348 | (hide-region-body (point) (progn (outline-end-of-subtree) (point)))) | |
349 | ||
350 | (defun show-subtree () | |
351 | "Show everything after this heading at deeper levels." | |
352 | (interactive) | |
353 | (outline-flag-subtree ?\n)) | |
354 | ||
71d78000 RS |
355 | (defun hide-sublevels (levels) |
356 | "Hide everything except the top LEVELS levels of headers." | |
9e9afbf8 | 357 | (interactive "p") |
71d78000 | 358 | (if (< levels 1) |
9e9afbf8 | 359 | (error "Must keep at least one level of headers")) |
71d78000 | 360 | (setq levels (1- levels)) |
9e9afbf8 RS |
361 | (save-excursion |
362 | (goto-char (point-min)) | |
363 | (hide-subtree) | |
71d78000 | 364 | (show-children levels) |
9e9afbf8 RS |
365 | (condition-case err |
366 | (while (outline-get-next-sibling) | |
367 | (hide-subtree) | |
71d78000 | 368 | (show-children levels)) |
9e9afbf8 RS |
369 | (error nil)))) |
370 | ||
371 | (defun hide-other () | |
372 | "Hide everything except for the current body and the parent headings." | |
373 | (interactive) | |
374 | (outline-hide-sublevels 1) | |
375 | (let ((last (point)) | |
376 | (pos (point))) | |
377 | (while (save-excursion | |
378 | (and (re-search-backward "[\n\r]" nil t) | |
379 | (eq (following-char) ?\r))) | |
380 | (save-excursion | |
381 | (beginning-of-line) | |
382 | (if (eq last (point)) | |
383 | (progn | |
384 | (outline-next-heading) | |
385 | (outline-flag-region last (point) ?\n)) | |
386 | (show-children) | |
387 | (setq last (point))))))) | |
388 | ||
26d1e4fd BP |
389 | (defun outline-flag-subtree (flag) |
390 | (save-excursion | |
391 | (outline-back-to-heading) | |
392 | (outline-end-of-heading) | |
393 | (outline-flag-region (point) | |
394 | (progn (outline-end-of-subtree) (point)) | |
395 | flag))) | |
396 | ||
397 | (defun outline-end-of-subtree () | |
398 | (outline-back-to-heading) | |
399 | (let ((opoint (point)) | |
400 | (first t) | |
476731da | 401 | (level (funcall outline-level))) |
26d1e4fd | 402 | (while (and (not (eobp)) |
476731da | 403 | (or first (> (funcall outline-level) level))) |
26d1e4fd BP |
404 | (setq first nil) |
405 | (outline-next-heading)) | |
9d721a9e RS |
406 | (if (eobp) |
407 | nil | |
408 | ;; go to end of line before heading | |
409 | (forward-char -1) | |
410 | ;; skip preceding balnk line, if there is one | |
411 | (if (memq (preceding-char) '(?\n ?\^M)) | |
412 | (forward-char -1))))) | |
26d1e4fd BP |
413 | \f |
414 | (defun show-branches () | |
415 | "Show all subheadings of this heading, but not their bodies." | |
416 | (interactive) | |
417 | (show-children 1000)) | |
418 | ||
419 | (defun show-children (&optional level) | |
420 | "Show all direct subheadings of this heading. | |
421 | Prefix arg LEVEL is how many levels below the current level should be shown. | |
422 | Default is enough to cause the following heading to appear." | |
423 | (interactive "P") | |
424 | (setq level | |
425 | (if level (prefix-numeric-value level) | |
426 | (save-excursion | |
c1eaf68c | 427 | (outline-back-to-heading) |
476731da | 428 | (let ((start-level (funcall outline-level))) |
26d1e4fd | 429 | (outline-next-heading) |
babf687a RS |
430 | (if (eobp) |
431 | 1 | |
432 | (max 1 (- (funcall outline-level) start-level))))))) | |
26d1e4fd | 433 | (save-excursion |
c1eaf68c RS |
434 | (save-restriction |
435 | (outline-back-to-heading) | |
436 | (setq level (+ level (funcall outline-level))) | |
437 | (narrow-to-region (point) | |
438 | (progn (outline-end-of-subtree) | |
439 | (if (eobp) (point-max) (1+ (point))))) | |
440 | (goto-char (point-min)) | |
441 | (while (and (not (eobp)) | |
442 | (progn | |
443 | (outline-next-heading) | |
444 | (not (eobp)))) | |
445 | (if (<= (funcall outline-level) level) | |
446 | (save-excursion | |
447 | (outline-flag-region (save-excursion | |
448 | (forward-char -1) | |
449 | (if (memq (preceding-char) '(?\n ?\^M)) | |
450 | (forward-char -1)) | |
451 | (point)) | |
452 | (progn (outline-end-of-heading) (point)) | |
453 | ?\n))))))) | |
26d1e4fd BP |
454 | \f |
455 | (defun outline-up-heading (arg) | |
456 | "Move to the heading line of which the present line is a subheading. | |
457 | With argument, move up ARG levels." | |
458 | (interactive "p") | |
459 | (outline-back-to-heading) | |
476731da | 460 | (if (eq (funcall outline-level) 1) |
26d1e4fd | 461 | (error "")) |
476731da | 462 | (while (and (> (funcall outline-level) 1) |
26d1e4fd BP |
463 | (> arg 0) |
464 | (not (bobp))) | |
476731da RS |
465 | (let ((present-level (funcall outline-level))) |
466 | (while (not (< (funcall outline-level) present-level)) | |
26d1e4fd BP |
467 | (outline-previous-visible-heading 1)) |
468 | (setq arg (- arg 1))))) | |
469 | ||
470 | (defun outline-forward-same-level (arg) | |
471 | "Move forward to the ARG'th subheading from here of the same level as the | |
472 | present one. It stops at the first and last subheadings of a superior heading." | |
473 | (interactive "p") | |
474 | (outline-back-to-heading) | |
475 | (while (> arg 0) | |
476 | (let ((point-to-move-to (save-excursion | |
477 | (outline-get-next-sibling)))) | |
478 | (if point-to-move-to | |
479 | (progn | |
480 | (goto-char point-to-move-to) | |
481 | (setq arg (1- arg))) | |
482 | (progn | |
483 | (setq arg 0) | |
484 | (error "")))))) | |
485 | ||
486 | (defun outline-get-next-sibling () | |
487 | "Position the point at the next heading of the same level, | |
488 | and return that position or nil if it cannot be found." | |
476731da | 489 | (let ((level (funcall outline-level))) |
26d1e4fd | 490 | (outline-next-visible-heading 1) |
476731da | 491 | (while (and (> (funcall outline-level) level) |
26d1e4fd BP |
492 | (not (eobp))) |
493 | (outline-next-visible-heading 1)) | |
476731da | 494 | (if (< (funcall outline-level) level) |
26d1e4fd BP |
495 | nil |
496 | (point)))) | |
497 | ||
498 | (defun outline-backward-same-level (arg) | |
499 | "Move backward to the ARG'th subheading from here of the same level as the | |
500 | present one. It stops at the first and last subheadings of a superior heading." | |
501 | (interactive "p") | |
502 | (outline-back-to-heading) | |
503 | (while (> arg 0) | |
504 | (let ((point-to-move-to (save-excursion | |
505 | (outline-get-last-sibling)))) | |
506 | (if point-to-move-to | |
507 | (progn | |
508 | (goto-char point-to-move-to) | |
509 | (setq arg (1- arg))) | |
510 | (progn | |
511 | (setq arg 0) | |
512 | (error "")))))) | |
513 | ||
514 | (defun outline-get-last-sibling () | |
515 | "Position the point at the previous heading of the same level, | |
516 | and return that position or nil if it cannot be found." | |
476731da | 517 | (let ((level (funcall outline-level))) |
26d1e4fd | 518 | (outline-previous-visible-heading 1) |
476731da | 519 | (while (and (> (funcall outline-level) level) |
26d1e4fd BP |
520 | (not (bobp))) |
521 | (outline-previous-visible-heading 1)) | |
476731da | 522 | (if (< (funcall outline-level) level) |
26d1e4fd BP |
523 | nil |
524 | (point)))) | |
525 | ||
8f1e8ff0 RS |
526 | (provide 'outline) |
527 | ||
6594deb0 | 528 | ;;; outline.el ends here |