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36a77f37 JB |
1 | ;;; outline.el --- outline mode commands for Emacs |
2 | ||
0d30b337 | 3 | ;; Copyright (C) 1986, 1993, 1994, 1995, 1997, 2000, 2001, 2002, |
e9bffc61 GM |
4 | ;; 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
5 | ;; Free Software Foundation, Inc. | |
36a77f37 JB |
6 | |
7 | ;; Maintainer: FSF | |
8 | ;; Keywords: outlines | |
9 | ||
10 | ;; This file is part of GNU Emacs. | |
11 | ||
eb3fa2cf | 12 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
36a77f37 | 13 | ;; it under the terms of the GNU General Public License as published by |
eb3fa2cf GM |
14 | ;; the Free Software Foundation, either version 3 of the License, or |
15 | ;; (at your option) any later version. | |
36a77f37 JB |
16 | |
17 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
18 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | ;; GNU General Public License for more details. | |
21 | ||
22 | ;; You should have received a copy of the GNU General Public License | |
eb3fa2cf | 23 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
36a77f37 JB |
24 | |
25 | ;;; Commentary: | |
26 | ||
27 | ;; This package is a major mode for editing outline-format documents. | |
28 | ;; An outline can be `abstracted' to show headers at any given level, | |
29 | ;; with all stuff below hidden. See the Emacs manual for details. | |
30 | ||
31 | ;;; Todo: | |
32 | ||
33 | ;; - subtree-terminators | |
34 | ;; - better handle comments before function bodies (i.e. heading) | |
35 | ;; - don't bother hiding whitespace | |
36 | ||
37 | ;;; Code: | |
38 | ||
f63f8737 JB |
39 | (defvar font-lock-warning-face) |
40 | ||
41 | ||
36a77f37 | 42 | (defgroup outlines nil |
7a5c8253 | 43 | "Support for hierarchical outlining." |
36a77f37 | 44 | :prefix "outline-" |
eba5b4dd | 45 | :group 'wp) |
36a77f37 JB |
46 | |
47 | (defcustom outline-regexp "[*\^L]+" | |
1e0e9b38 | 48 | "Regular expression to match the beginning of a heading. |
36a77f37 JB |
49 | Any line whose beginning matches this regexp is considered to start a heading. |
50 | Note that Outline mode only checks this regexp at the start of a line, | |
51 | so the regexp need not (and usually does not) start with `^'. | |
52 | The recommended way to set this is with a Local Variables: list | |
53 | in the file it applies to. See also `outline-heading-end-regexp'." | |
54 | :type '(choice regexp (const nil)) | |
55 | :group 'outlines) | |
631c8020 | 56 | ;;;###autoload(put 'outline-regexp 'safe-local-variable 'string-or-null-p) |
36a77f37 JB |
57 | |
58 | (defcustom outline-heading-end-regexp "\n" | |
1e0e9b38 | 59 | "Regular expression to match the end of a heading line. |
36a77f37 JB |
60 | You can assume that point is at the beginning of a heading when this |
61 | regexp is searched for. The heading ends at the end of the match. | |
62 | The recommended way to set this is with a `Local Variables:' list | |
63 | in the file it applies to." | |
64 | :type 'regexp | |
65 | :group 'outlines) | |
66 | ||
67 | (defvar outline-mode-prefix-map | |
68 | (let ((map (make-sparse-keymap))) | |
69 | (define-key map "@" 'outline-mark-subtree) | |
70 | (define-key map "\C-n" 'outline-next-visible-heading) | |
71 | (define-key map "\C-p" 'outline-previous-visible-heading) | |
72 | (define-key map "\C-i" 'show-children) | |
73 | (define-key map "\C-s" 'show-subtree) | |
74 | (define-key map "\C-d" 'hide-subtree) | |
75 | (define-key map "\C-u" 'outline-up-heading) | |
76 | (define-key map "\C-f" 'outline-forward-same-level) | |
77 | (define-key map "\C-b" 'outline-backward-same-level) | |
78 | (define-key map "\C-t" 'hide-body) | |
79 | (define-key map "\C-a" 'show-all) | |
80 | (define-key map "\C-c" 'hide-entry) | |
81 | (define-key map "\C-e" 'show-entry) | |
82 | (define-key map "\C-l" 'hide-leaves) | |
83 | (define-key map "\C-k" 'show-branches) | |
84 | (define-key map "\C-q" 'hide-sublevels) | |
85 | (define-key map "\C-o" 'hide-other) | |
86 | (define-key map "\C-^" 'outline-move-subtree-up) | |
87 | (define-key map "\C-v" 'outline-move-subtree-down) | |
88 | (define-key map [(control ?<)] 'outline-promote) | |
89 | (define-key map [(control ?>)] 'outline-demote) | |
90 | (define-key map "\C-m" 'outline-insert-heading) | |
91 | ;; Where to bind outline-cycle ? | |
92 | map)) | |
93 | ||
94 | (defvar outline-mode-menu-bar-map | |
95 | (let ((map (make-sparse-keymap))) | |
96 | ||
97 | (define-key map [hide] (cons "Hide" (make-sparse-keymap "Hide"))) | |
98 | ||
7cd25617 DN |
99 | (define-key map [hide hide-other] |
100 | '(menu-item "Hide Other" hide-other | |
101 | :help "Hide everything except current body and parent and top-level headings")) | |
102 | (define-key map [hide hide-sublevels] | |
103 | '(menu-item "Hide Sublevels" hide-sublevels | |
104 | :help "Hide everything but the top LEVELS levels of headers, in whole buffer")) | |
105 | (define-key map [hide hide-subtree] | |
106 | '(menu-item "Hide Subtree" hide-subtree | |
799224fe | 107 | :help "Hide everything after this heading at deeper levels")) |
7cd25617 DN |
108 | (define-key map [hide hide-entry] |
109 | '(menu-item "Hide Entry" hide-entry | |
799224fe | 110 | :help "Hide the body directly following this heading")) |
7cd25617 DN |
111 | (define-key map [hide hide-body] |
112 | '(menu-item "Hide Body" hide-body | |
799224fe | 113 | :help "Hide all body lines in buffer, leaving all headings visible")) |
7cd25617 DN |
114 | (define-key map [hide hide-leaves] |
115 | '(menu-item "Hide Leaves" hide-leaves | |
799224fe | 116 | :help "Hide the body after this heading and at deeper levels")) |
36a77f37 JB |
117 | |
118 | (define-key map [show] (cons "Show" (make-sparse-keymap "Show"))) | |
119 | ||
7cd25617 DN |
120 | (define-key map [show show-subtree] |
121 | '(menu-item "Show Subtree" show-subtree | |
799224fe | 122 | :help "Show everything after this heading at deeper levels")) |
7cd25617 DN |
123 | (define-key map [show show-children] |
124 | '(menu-item "Show Children" show-children | |
799224fe | 125 | :help "Show all direct subheadings of this heading")) |
7cd25617 DN |
126 | (define-key map [show show-branches] |
127 | '(menu-item "Show Branches" show-branches | |
799224fe | 128 | :help "Show all subheadings of this heading, but not their bodies")) |
7cd25617 DN |
129 | (define-key map [show show-entry] |
130 | '(menu-item "Show Entry" show-entry | |
799224fe | 131 | :help "Show the body directly following this heading")) |
7cd25617 DN |
132 | (define-key map [show show-all] |
133 | '(menu-item "Show All" show-all | |
799224fe | 134 | :help "Show all of the text in the buffer")) |
36a77f37 JB |
135 | |
136 | (define-key map [headings] | |
137 | (cons "Headings" (make-sparse-keymap "Headings"))) | |
138 | ||
139 | (define-key map [headings demote-subtree] | |
7cd25617 | 140 | '(menu-item "Demote subtree" outline-demote |
799224fe | 141 | :help "Demote headings lower down the tree")) |
36a77f37 | 142 | (define-key map [headings promote-subtree] |
7cd25617 | 143 | '(menu-item "Promote subtree" outline-promote |
799224fe | 144 | :help "Promote headings higher up the tree")) |
36a77f37 | 145 | (define-key map [headings move-subtree-down] |
7cd25617 | 146 | '(menu-item "Move subtree down" outline-move-subtree-down |
799224fe | 147 | :help "Move the currrent subtree down past arg headlines of the same level")) |
36a77f37 | 148 | (define-key map [headings move-subtree-up] |
7cd25617 | 149 | '(menu-item "Move subtree up" outline-move-subtree-up |
799224fe | 150 | :help "Move the currrent subtree up past arg headlines of the same level")) |
36a77f37 JB |
151 | (define-key map [headings copy] |
152 | '(menu-item "Copy to kill ring" outline-headers-as-kill | |
7cd25617 | 153 | :enable mark-active |
799224fe | 154 | :help "Save the visible outline headers in region at the start of the kill ring")) |
36a77f37 | 155 | (define-key map [headings outline-insert-heading] |
7cd25617 DN |
156 | |
157 | '(menu-item "New heading" outline-insert-heading | |
799224fe | 158 | :help "Insert a new heading at same depth at point")) |
36a77f37 | 159 | (define-key map [headings outline-backward-same-level] |
7cd25617 DN |
160 | |
161 | '(menu-item "Previous Same Level" outline-backward-same-level | |
799224fe | 162 | :help "Move backward to the arg'th subheading at same level as this one.")) |
36a77f37 | 163 | (define-key map [headings outline-forward-same-level] |
7cd25617 DN |
164 | |
165 | '(menu-item "Next Same Level" outline-forward-same-level | |
799224fe | 166 | :help "Move forward to the arg'th subheading at same level as this one")) |
36a77f37 | 167 | (define-key map [headings outline-previous-visible-heading] |
7cd25617 DN |
168 | |
169 | '(menu-item "Previous" outline-previous-visible-heading | |
799224fe | 170 | :help "Move to the previous heading line")) |
36a77f37 | 171 | (define-key map [headings outline-next-visible-heading] |
7cd25617 DN |
172 | |
173 | '(menu-item "Next" outline-next-visible-heading | |
799224fe | 174 | :help "Move to the next visible heading line")) |
36a77f37 | 175 | (define-key map [headings outline-up-heading] |
7cd25617 DN |
176 | |
177 | '(menu-item "Up" outline-up-heading | |
799224fe | 178 | :help "Move to the visible heading line of which the present line is a subheading")) |
36a77f37 JB |
179 | map)) |
180 | ||
181 | (defvar outline-minor-mode-menu-bar-map | |
182 | (let ((map (make-sparse-keymap))) | |
183 | (define-key map [outline] | |
184 | (cons "Outline" | |
185 | (nconc (make-sparse-keymap "Outline") | |
186 | ;; Remove extra separator | |
187 | (cdr | |
188 | ;; Flatten the major mode's menus into a single menu. | |
189 | (apply 'append | |
190 | (mapcar (lambda (x) | |
191 | (if (consp x) | |
192 | ;; Add a separator between each | |
193 | ;; part of the unified menu. | |
194 | (cons '(--- "---") (cdr x)))) | |
195 | outline-mode-menu-bar-map)))))) | |
196 | map)) | |
48c9ce10 | 197 | |
36a77f37 JB |
198 | |
199 | (defvar outline-mode-map | |
200 | (let ((map (make-sparse-keymap))) | |
201 | (define-key map "\C-c" outline-mode-prefix-map) | |
202 | (define-key map [menu-bar] outline-mode-menu-bar-map) | |
203 | map)) | |
204 | ||
205 | (defvar outline-font-lock-keywords | |
206 | '(;; | |
207 | ;; Highlight headings according to the level. | |
208 | (eval . (list (concat "^\\(?:" outline-regexp "\\).+") | |
209 | 0 '(outline-font-lock-face) nil t))) | |
210 | "Additional expressions to highlight in Outline mode.") | |
211 | ||
1f2503a5 LK |
212 | (defface outline-1 |
213 | '((t :inherit font-lock-function-name-face)) | |
214 | "Level 1." | |
215 | :group 'outlines) | |
216 | ||
217 | (defface outline-2 | |
218 | '((t :inherit font-lock-variable-name-face)) | |
219 | "Level 2." | |
220 | :group 'outlines) | |
221 | ||
222 | (defface outline-3 | |
223 | '((t :inherit font-lock-keyword-face)) | |
224 | "Level 3." | |
225 | :group 'outlines) | |
226 | ||
227 | (defface outline-4 | |
9c934431 | 228 | '((t :inherit font-lock-comment-face)) |
1f2503a5 LK |
229 | "Level 4." |
230 | :group 'outlines) | |
231 | ||
232 | (defface outline-5 | |
9c934431 | 233 | '((t :inherit font-lock-type-face)) |
1f2503a5 LK |
234 | "Level 5." |
235 | :group 'outlines) | |
236 | ||
237 | (defface outline-6 | |
238 | '((t :inherit font-lock-constant-face)) | |
239 | "Level 6." | |
240 | :group 'outlines) | |
241 | ||
242 | (defface outline-7 | |
9c934431 | 243 | '((t :inherit font-lock-builtin-face)) |
1f2503a5 LK |
244 | "Level 7." |
245 | :group 'outlines) | |
246 | ||
247 | (defface outline-8 | |
248 | '((t :inherit font-lock-string-face)) | |
249 | "Level 8." | |
250 | :group 'outlines) | |
36a77f37 JB |
251 | |
252 | (defvar outline-font-lock-faces | |
253 | [outline-1 outline-2 outline-3 outline-4 | |
254 | outline-5 outline-6 outline-7 outline-8]) | |
255 | ||
550641d3 DP |
256 | ;; (defvar outline-font-lock-levels nil) |
257 | ;; (make-variable-buffer-local 'outline-font-lock-levels) | |
36a77f37 JB |
258 | |
259 | (defun outline-font-lock-face () | |
260 | ;; (save-excursion | |
261 | ;; (outline-back-to-heading t) | |
262 | ;; (let* ((count 0) | |
263 | ;; (start-level (funcall outline-level)) | |
264 | ;; (level start-level) | |
265 | ;; face-level) | |
266 | ;; (while (not (setq face-level | |
267 | ;; (if (or (bobp) (eq level 1)) 0 | |
268 | ;; (cdr (assq level outline-font-lock-levels))))) | |
269 | ;; (outline-up-heading 1 t) | |
270 | ;; (setq count (1+ count)) | |
271 | ;; (setq level (funcall outline-level))) | |
272 | ;; ;; Remember for later. | |
273 | ;; (unless (zerop count) | |
274 | ;; (setq face-level (+ face-level count)) | |
275 | ;; (push (cons start-level face-level) outline-font-lock-levels)) | |
276 | ;; (condition-case nil | |
277 | ;; (aref outline-font-lock-faces face-level) | |
278 | ;; (error font-lock-warning-face)))) | |
279 | (save-excursion | |
280 | (goto-char (match-beginning 0)) | |
281 | (looking-at outline-regexp) | |
550641d3 | 282 | (aref outline-font-lock-faces (% (1- (funcall outline-level)) (length outline-font-lock-faces))))) |
36a77f37 JB |
283 | |
284 | (defvar outline-view-change-hook nil | |
285 | "Normal hook to be run after outline visibility changes.") | |
286 | ||
48c9ce10 JB |
287 | (defvar outline-mode-hook nil |
288 | "*This hook is run when outline mode starts.") | |
289 | ||
ca858c64 JL |
290 | (defvar outline-blank-line nil |
291 | "*Non-nil means to leave unhidden blank line before heading.") | |
292 | ||
36a77f37 JB |
293 | ;;;###autoload |
294 | (define-derived-mode outline-mode text-mode "Outline" | |
295 | "Set major mode for editing outlines with selective display. | |
296 | Headings are lines which start with asterisks: one for major headings, | |
297 | two for subheadings, etc. Lines not starting with asterisks are body lines. | |
298 | ||
299 | Body text or subheadings under a heading can be made temporarily | |
300 | invisible, or visible again. Invisible lines are attached to the end | |
301 | of the heading, so they move with it, if the line is killed and yanked | |
302 | back. A heading with text hidden under it is marked with an ellipsis (...). | |
303 | ||
304 | Commands:\\<outline-mode-map> | |
305 | \\[outline-next-visible-heading] outline-next-visible-heading move by visible headings | |
306 | \\[outline-previous-visible-heading] outline-previous-visible-heading | |
307 | \\[outline-forward-same-level] outline-forward-same-level similar but skip subheadings | |
308 | \\[outline-backward-same-level] outline-backward-same-level | |
309 | \\[outline-up-heading] outline-up-heading move from subheading to heading | |
310 | ||
311 | \\[hide-body] make all text invisible (not headings). | |
312 | \\[show-all] make everything in buffer visible. | |
313 | \\[hide-sublevels] make only the first N levels of headers visible. | |
314 | ||
315 | The remaining commands are used when point is on a heading line. | |
316 | They apply to some of the body or subheadings of that heading. | |
317 | \\[hide-subtree] hide-subtree make body and subheadings invisible. | |
318 | \\[show-subtree] show-subtree make body and subheadings visible. | |
319 | \\[show-children] show-children make direct subheadings visible. | |
320 | No effect on body, or subheadings 2 or more levels down. | |
321 | With arg N, affects subheadings N levels down. | |
322 | \\[hide-entry] make immediately following body invisible. | |
323 | \\[show-entry] make it visible. | |
324 | \\[hide-leaves] make body under heading and under its subheadings invisible. | |
325 | The subheadings remain visible. | |
326 | \\[show-branches] make all subheadings at all levels visible. | |
327 | ||
328 | The variable `outline-regexp' can be changed to control what is a heading. | |
329 | A line is a heading if `outline-regexp' matches something at the | |
330 | beginning of the line. The longer the match, the deeper the level. | |
331 | ||
332 | Turning on outline mode calls the value of `text-mode-hook' and then of | |
333 | `outline-mode-hook', if they are non-nil." | |
334 | (make-local-variable 'line-move-ignore-invisible) | |
335 | (setq line-move-ignore-invisible t) | |
336 | ;; Cause use of ellipses for invisible text. | |
337 | (add-to-invisibility-spec '(outline . t)) | |
338 | (set (make-local-variable 'paragraph-start) | |
339 | (concat paragraph-start "\\|\\(?:" outline-regexp "\\)")) | |
340 | ;; Inhibit auto-filling of header lines. | |
341 | (set (make-local-variable 'auto-fill-inhibit-regexp) outline-regexp) | |
342 | (set (make-local-variable 'paragraph-separate) | |
343 | (concat paragraph-separate "\\|\\(?:" outline-regexp "\\)")) | |
344 | (set (make-local-variable 'font-lock-defaults) | |
345 | '(outline-font-lock-keywords t nil nil backward-paragraph)) | |
346 | (setq imenu-generic-expression | |
347 | (list (list nil (concat "^\\(?:" outline-regexp "\\).*$") 0))) | |
53526855 | 348 | (add-hook 'change-major-mode-hook 'show-all nil t)) |
36a77f37 JB |
349 | |
350 | (defcustom outline-minor-mode-prefix "\C-c@" | |
9201cc28 | 351 | "Prefix key to use for Outline commands in Outline minor mode. |
36a77f37 JB |
352 | The value of this variable is checked as part of loading Outline mode. |
353 | After that, changing the prefix key requires manipulating keymaps." | |
354 | :type 'string | |
355 | :group 'outlines) | |
356 | ||
357 | ;;;###autoload | |
358 | (define-minor-mode outline-minor-mode | |
359 | "Toggle Outline minor mode. | |
360 | With arg, turn Outline minor mode on if arg is positive, off otherwise. | |
361 | See the command `outline-mode' for more information on this mode." | |
362 | nil " Outl" (list (cons [menu-bar] outline-minor-mode-menu-bar-map) | |
363 | (cons outline-minor-mode-prefix outline-mode-prefix-map)) | |
364 | :group 'outlines | |
365 | (if outline-minor-mode | |
366 | (progn | |
367 | ;; Turn off this mode if we change major modes. | |
368 | (add-hook 'change-major-mode-hook | |
369 | (lambda () (outline-minor-mode -1)) | |
370 | nil t) | |
371 | (set (make-local-variable 'line-move-ignore-invisible) t) | |
372 | ;; Cause use of ellipses for invisible text. | |
373 | (add-to-invisibility-spec '(outline . t))) | |
374 | (setq line-move-ignore-invisible nil) | |
375 | ;; Cause use of ellipses for invisible text. | |
376 | (remove-from-invisibility-spec '(outline . t)) | |
377 | ;; When turning off outline mode, get rid of any outline hiding. | |
378 | (show-all))) | |
379 | \f | |
380 | (defvar outline-level 'outline-level | |
381 | "*Function of no args to compute a header's nesting level in an outline. | |
382 | It can assume point is at the beginning of a header line and that the match | |
383 | data reflects the `outline-regexp'.") | |
6dc3311d | 384 | ;;;###autoload(put 'outline-level 'risky-local-variable t) |
36a77f37 JB |
385 | |
386 | (defvar outline-heading-alist () | |
387 | "Alist associating a heading for every possible level. | |
388 | Each entry is of the form (HEADING . LEVEL). | |
389 | This alist is used two ways: to find the heading corresponding to | |
390 | a given level and to find the level of a given heading. | |
391 | If a mode or document needs several sets of outline headings (for example | |
392 | numbered and unnumbered sections), list them set by set and sorted by level | |
393 | within each set. For example in texinfo mode: | |
394 | ||
395 | (setq outline-heading-alist | |
396 | '((\"@chapter\" . 2) (\"@section\" . 3) (\"@subsection\" . 4) | |
397 | (\"@subsubsection\" . 5) | |
398 | (\"@unnumbered\" . 2) (\"@unnumberedsec\" . 3) | |
399 | (\"@unnumberedsubsec\" . 4) (\"@unnumberedsubsubsec\" . 5) | |
400 | (\"@appendix\" . 2) (\"@appendixsec\" . 3)... | |
401 | (\"@appendixsubsec\" . 4) (\"@appendixsubsubsec\" . 5) ..)) | |
402 | ||
403 | Instead of sorting the entries in each set, you can also separate the | |
404 | sets with nil.") | |
405 | (make-variable-buffer-local 'outline-heading-alist) | |
406 | ||
407 | ;; This used to count columns rather than characters, but that made ^L | |
408 | ;; appear to be at level 2 instead of 1. Columns would be better for | |
409 | ;; tab handling, but the default regexp doesn't use tabs, and anyone | |
410 | ;; who changes the regexp can also redefine the outline-level variable | |
411 | ;; as appropriate. | |
412 | (defun outline-level () | |
413 | "Return the depth to which a statement is nested in the outline. | |
414 | Point must be at the beginning of a header line. | |
415 | This is actually either the level specified in `outline-heading-alist' | |
416 | or else the number of characters matched by `outline-regexp'." | |
417 | (or (cdr (assoc (match-string 0) outline-heading-alist)) | |
418 | (- (match-end 0) (match-beginning 0)))) | |
419 | ||
420 | (defun outline-next-preface () | |
421 | "Skip forward to just before the next heading line. | |
422 | If there's no following heading line, stop before the newline | |
423 | at the end of the buffer." | |
424 | (if (re-search-forward (concat "\n\\(?:" outline-regexp "\\)") | |
425 | nil 'move) | |
426 | (goto-char (match-beginning 0))) | |
ca858c64 | 427 | (if (and (bolp) (or outline-blank-line (eobp)) (not (bobp))) |
36a77f37 JB |
428 | (forward-char -1))) |
429 | ||
430 | (defun outline-next-heading () | |
431 | "Move to the next (possibly invisible) heading line." | |
432 | (interactive) | |
433 | ;; Make sure we don't match the heading we're at. | |
434 | (if (and (bolp) (not (eobp))) (forward-char 1)) | |
435 | (if (re-search-forward (concat "^\\(?:" outline-regexp "\\)") | |
436 | nil 'move) | |
437 | (goto-char (match-beginning 0)))) | |
438 | ||
439 | (defun outline-previous-heading () | |
440 | "Move to the previous (possibly invisible) heading line." | |
441 | (interactive) | |
442 | (re-search-backward (concat "^\\(?:" outline-regexp "\\)") | |
443 | nil 'move)) | |
444 | ||
445 | (defsubst outline-invisible-p (&optional pos) | |
446 | "Non-nil if the character after point is invisible." | |
447 | (get-char-property (or pos (point)) 'invisible)) | |
448 | ||
36a77f37 JB |
449 | (defun outline-back-to-heading (&optional invisible-ok) |
450 | "Move to previous heading line, or beg of this line if it's a heading. | |
451 | Only visible heading lines are considered, unless INVISIBLE-OK is non-nil." | |
452 | (beginning-of-line) | |
453 | (or (outline-on-heading-p invisible-ok) | |
454 | (let (found) | |
455 | (save-excursion | |
456 | (while (not found) | |
457 | (or (re-search-backward (concat "^\\(?:" outline-regexp "\\)") | |
458 | nil t) | |
459 | (error "before first heading")) | |
460 | (setq found (and (or invisible-ok (not (outline-invisible-p))) | |
461 | (point))))) | |
462 | (goto-char found) | |
463 | found))) | |
464 | ||
465 | (defun outline-on-heading-p (&optional invisible-ok) | |
466 | "Return t if point is on a (visible) heading line. | |
467 | If INVISIBLE-OK is non-nil, an invisible heading line is ok too." | |
468 | (save-excursion | |
469 | (beginning-of-line) | |
470 | (and (bolp) (or invisible-ok (not (outline-invisible-p))) | |
471 | (looking-at outline-regexp)))) | |
472 | ||
473 | (defun outline-insert-heading () | |
474 | "Insert a new heading at same depth at point." | |
475 | (interactive) | |
476 | (let ((head (save-excursion | |
477 | (condition-case nil | |
478 | (outline-back-to-heading) | |
479 | (error (outline-next-heading))) | |
480 | (if (eobp) | |
481 | (or (caar outline-heading-alist) "") | |
482 | (match-string 0))))) | |
483 | (unless (or (string-match "[ \t]\\'" head) | |
f56af8ca SM |
484 | (not (string-match (concat "\\`\\(?:" outline-regexp "\\)") |
485 | (concat head " ")))) | |
36a77f37 JB |
486 | (setq head (concat head " "))) |
487 | (unless (bolp) (end-of-line) (newline)) | |
488 | (insert head) | |
489 | (unless (eolp) | |
490 | (save-excursion (newline-and-indent))) | |
491 | (run-hooks 'outline-insert-heading-hook))) | |
492 | ||
797d92ed SM |
493 | (defun outline-invent-heading (head up) |
494 | (save-match-data | |
495 | ;; Let's try to invent one by repeating or deleting the last char. | |
496 | (let ((new-head (if up (substring head 0 -1) | |
497 | (concat head (substring head -1))))) | |
498 | (if (string-match (concat "\\`\\(?:" outline-regexp "\\)") | |
499 | new-head) | |
500 | ;; Why bother checking that it is indeed higher/lower level ? | |
501 | new-head | |
502 | ;; Didn't work, so ask what to do. | |
503 | (read-string (format "%s heading for `%s': " | |
504 | (if up "Parent" "Demoted") head) | |
505 | head nil nil t))))) | |
506 | ||
914f7ec3 | 507 | (defun outline-promote (&optional which) |
36a77f37 | 508 | "Promote headings higher up the tree. |
914f7ec3 EZ |
509 | If transient-mark-mode is on, and mark is active, promote headings in |
510 | the region (from a Lisp program, pass `region' for WHICH). Otherwise: | |
511 | without prefix argument, promote current heading and all headings in the | |
512 | subtree (from a Lisp program, pass `subtree' for WHICH); with prefix | |
513 | argument, promote just the current heading (from a Lisp program, pass | |
514 | nil for WHICH, or do not pass any argument)." | |
36a77f37 JB |
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 | |
914f7ec3 | 520 | ((eq which 'region) |
36a77f37 | 521 | (outline-map-region 'outline-promote (region-beginning) (region-end))) |
914f7ec3 | 522 | (which |
36a77f37 JB |
523 | (outline-map-region 'outline-promote |
524 | (point) | |
525 | (save-excursion (outline-get-next-sibling) (point)))) | |
526 | (t | |
527 | (outline-back-to-heading t) | |
20e3210f | 528 | (let* ((head (match-string-no-properties 0)) |
36a77f37 JB |
529 | (level (save-match-data (funcall outline-level))) |
530 | (up-head (or (outline-head-from-level (1- level) head) | |
20e3210f RS |
531 | ;; Use the parent heading, if it is really |
532 | ;; one level less. | |
36a77f37 JB |
533 | (save-excursion |
534 | (save-match-data | |
535 | (outline-up-heading 1 t) | |
20e3210f RS |
536 | (and (= (1- level) (funcall outline-level)) |
537 | (match-string-no-properties 0)))) | |
797d92ed SM |
538 | ;; Bummer!! There is no lower level heading. |
539 | (outline-invent-heading head 'up)))) | |
48c9ce10 | 540 | |
36a77f37 JB |
541 | (unless (rassoc level outline-heading-alist) |
542 | (push (cons head level) outline-heading-alist)) | |
48c9ce10 | 543 | |
36a77f37 JB |
544 | (replace-match up-head nil t))))) |
545 | ||
914f7ec3 | 546 | (defun outline-demote (&optional which) |
36a77f37 | 547 | "Demote headings lower down the tree. |
914f7ec3 EZ |
548 | If transient-mark-mode is on, and mark is active, demote headings in |
549 | the region (from a Lisp program, pass `region' for WHICH). Otherwise: | |
550 | without prefix argument, demote current heading and all headings in the | |
551 | subtree (from a Lisp program, pass `subtree' for WHICH); with prefix | |
552 | argument, demote just the current heading (from a Lisp program, pass | |
553 | nil for WHICH, or do not pass any argument)." | |
36a77f37 JB |
554 | (interactive |
555 | (list (if (and transient-mark-mode mark-active) 'region | |
556 | (outline-back-to-heading) | |
557 | (if current-prefix-arg nil 'subtree)))) | |
558 | (cond | |
914f7ec3 | 559 | ((eq which 'region) |
36a77f37 | 560 | (outline-map-region 'outline-demote (region-beginning) (region-end))) |
914f7ec3 | 561 | (which |
36a77f37 JB |
562 | (outline-map-region 'outline-demote |
563 | (point) | |
564 | (save-excursion (outline-get-next-sibling) (point)))) | |
565 | (t | |
20e3210f | 566 | (let* ((head (match-string-no-properties 0)) |
36a77f37 JB |
567 | (level (save-match-data (funcall outline-level))) |
568 | (down-head | |
569 | (or (outline-head-from-level (1+ level) head) | |
570 | (save-excursion | |
571 | (save-match-data | |
572 | (while (and (progn (outline-next-heading) (not (eobp))) | |
573 | (<= (funcall outline-level) level))) | |
574 | (when (eobp) | |
575 | ;; Try again from the beginning of the buffer. | |
576 | (goto-char (point-min)) | |
577 | (while (and (progn (outline-next-heading) (not (eobp))) | |
578 | (<= (funcall outline-level) level)))) | |
579 | (unless (eobp) | |
580 | (looking-at outline-regexp) | |
20e3210f | 581 | (match-string-no-properties 0)))) |
797d92ed SM |
582 | ;; Bummer!! There is no higher-level heading in the buffer. |
583 | (outline-invent-heading head nil)))) | |
36a77f37 | 584 | |
20e3210f RS |
585 | (unless (rassoc level outline-heading-alist) |
586 | (push (cons head level) outline-heading-alist)) | |
587 | (replace-match down-head nil t))))) | |
36a77f37 JB |
588 | |
589 | (defun outline-head-from-level (level head &optional alist) | |
590 | "Get new heading with level LEVEL from ALIST. | |
591 | If there are no such entries, return nil. | |
592 | ALIST defaults to `outline-heading-alist'. | |
593 | Similar to (car (rassoc LEVEL ALIST)). | |
594 | If there are several different entries with same new level, choose | |
fa5f7c5f | 595 | the one with the smallest distance to the association of HEAD in the alist. |
36a77f37 JB |
596 | This makes it possible for promotion to work in modes with several |
597 | independent sets of headings (numbered, unnumbered, appendix...)" | |
598 | (unless alist (setq alist outline-heading-alist)) | |
599 | (let ((l (rassoc level alist)) | |
600 | ll h hl l2 l2l) | |
601 | (cond | |
602 | ((null l) nil) | |
603 | ;; If there's no HEAD after L, any other entry for LEVEL after L | |
604 | ;; can't be much better than L. | |
605 | ((null (setq h (assoc head (setq ll (memq l alist))))) (car l)) | |
606 | ;; If there's no other entry for LEVEL, just keep L. | |
607 | ((null (setq l2 (rassoc level (cdr ll)))) (car l)) | |
608 | ;; Now we have L, L2, and H: see if L2 seems better than L. | |
609 | ;; If H is after L2, L2 is better. | |
610 | ((memq h (setq l2l (memq l2 (cdr ll)))) | |
611 | (outline-head-from-level level head l2l)) | |
612 | ;; Now we have H between L and L2. | |
613 | ;; If there's a separator between L and H, prefer L2. | |
614 | ((memq h (memq nil ll)) | |
615 | (outline-head-from-level level head l2l)) | |
616 | ;; If there's a separator between L2 and H, prefer L. | |
617 | ((memq l2 (memq nil (setq hl (memq h ll)))) (car l)) | |
618 | ;; No separator between L and L2, check the distance. | |
619 | ((< (* 2 (length hl)) (+ (length ll) (length l2l))) | |
620 | (outline-head-from-level level head l2l)) | |
621 | ;; If all else fails, just keep L. | |
622 | (t (car l))))) | |
623 | ||
624 | (defun outline-map-region (fun beg end) | |
625 | "Call FUN for every heading between BEG and END. | |
626 | When FUN is called, point is at the beginning of the heading and | |
627 | the match data is set appropriately." | |
628 | (save-excursion | |
629 | (setq end (copy-marker end)) | |
630 | (goto-char beg) | |
631 | (when (re-search-forward (concat "^\\(?:" outline-regexp "\\)") end t) | |
632 | (goto-char (match-beginning 0)) | |
633 | (funcall fun) | |
634 | (while (and (progn | |
635 | (outline-next-heading) | |
636 | (< (point) end)) | |
637 | (not (eobp))) | |
638 | (funcall fun))))) | |
639 | ||
640 | ;; Vertical tree motion | |
641 | ||
642 | (defun outline-move-subtree-up (&optional arg) | |
643 | "Move the currrent subtree up past ARG headlines of the same level." | |
644 | (interactive "p") | |
645 | (outline-move-subtree-down (- arg))) | |
646 | ||
647 | (defun outline-move-subtree-down (&optional arg) | |
648 | "Move the currrent subtree down past ARG headlines of the same level." | |
649 | (interactive "p") | |
797d92ed | 650 | (let ((movfunc (if (> arg 0) 'outline-get-next-sibling |
36a77f37 JB |
651 | 'outline-get-last-sibling)) |
652 | (ins-point (make-marker)) | |
653 | (cnt (abs arg)) | |
797d92ed | 654 | beg end folded) |
36a77f37 JB |
655 | ;; Select the tree |
656 | (outline-back-to-heading) | |
657 | (setq beg (point)) | |
48c9ce10 JB |
658 | (save-match-data |
659 | (save-excursion (outline-end-of-heading) | |
36a77f37 JB |
660 | (setq folded (outline-invisible-p))) |
661 | (outline-end-of-subtree)) | |
662 | (if (= (char-after) ?\n) (forward-char 1)) | |
663 | (setq end (point)) | |
664 | ;; Find insertion point, with error handling | |
665 | (goto-char beg) | |
666 | (while (> cnt 0) | |
667 | (or (funcall movfunc) | |
668 | (progn (goto-char beg) | |
669 | (error "Cannot move past superior level"))) | |
670 | (setq cnt (1- cnt))) | |
671 | (if (> arg 0) | |
672 | ;; Moving forward - still need to move over subtree | |
48c9ce10 | 673 | (progn (outline-end-of-subtree) |
36a77f37 JB |
674 | (if (= (char-after) ?\n) (forward-char 1)))) |
675 | (move-marker ins-point (point)) | |
676 | (insert (delete-and-extract-region beg end)) | |
677 | (goto-char ins-point) | |
678 | (if folded (hide-subtree)) | |
679 | (move-marker ins-point nil))) | |
680 | ||
681 | (defun outline-end-of-heading () | |
682 | (if (re-search-forward outline-heading-end-regexp nil 'move) | |
683 | (forward-char -1))) | |
684 | ||
685 | (defun outline-next-visible-heading (arg) | |
686 | "Move to the next visible heading line. | |
687 | With argument, repeats or can move backward if negative. | |
688 | A heading line is one that starts with a `*' (or that | |
689 | `outline-regexp' matches)." | |
690 | (interactive "p") | |
691 | (if (< arg 0) | |
692 | (beginning-of-line) | |
693 | (end-of-line)) | |
cf27cc83 EZ |
694 | (let (found-heading-p) |
695 | (while (and (not (bobp)) (< arg 0)) | |
696 | (while (and (not (bobp)) | |
697 | (setq found-heading-p | |
698 | (re-search-backward | |
699 | (concat "^\\(?:" outline-regexp "\\)") | |
700 | nil 'move)) | |
701 | (outline-invisible-p))) | |
702 | (setq arg (1+ arg))) | |
703 | (while (and (not (eobp)) (> arg 0)) | |
704 | (while (and (not (eobp)) | |
705 | (setq found-heading-p | |
706 | (re-search-forward | |
707 | (concat "^\\(?:" outline-regexp "\\)") | |
708 | nil 'move)) | |
709 | (outline-invisible-p (match-beginning 0)))) | |
710 | (setq arg (1- arg))) | |
711 | (if found-heading-p (beginning-of-line)))) | |
36a77f37 JB |
712 | |
713 | (defun outline-previous-visible-heading (arg) | |
714 | "Move to the previous heading line. | |
715 | With argument, repeats or can move forward if negative. | |
716 | A heading line is one that starts with a `*' (or that | |
717 | `outline-regexp' matches)." | |
718 | (interactive "p") | |
719 | (outline-next-visible-heading (- arg))) | |
720 | ||
721 | (defun outline-mark-subtree () | |
722 | "Mark the current subtree in an outlined document. | |
723 | This puts point at the start of the current subtree, and mark at the end." | |
724 | (interactive) | |
725 | (let ((beg)) | |
726 | (if (outline-on-heading-p) | |
727 | ;; we are already looking at a heading | |
728 | (beginning-of-line) | |
729 | ;; else go back to previous heading | |
730 | (outline-previous-visible-heading 1)) | |
731 | (setq beg (point)) | |
732 | (outline-end-of-subtree) | |
d35b8a28 | 733 | (push-mark (point) nil t) |
36a77f37 JB |
734 | (goto-char beg))) |
735 | \f | |
736 | ||
203bef73 KS |
737 | (defvar outline-isearch-open-invisible-function nil |
738 | "Function called if `isearch' finishes in an invisible overlay. | |
739 | The function is called with the overlay as its only argument. | |
740 | If nil, `show-entry' is called to reveal the invisible text.") | |
741 | ||
36a77f37 JB |
742 | (put 'outline 'reveal-toggle-invisible 'outline-reveal-toggle-invisible) |
743 | (defun outline-flag-region (from to flag) | |
744 | "Hide or show lines from FROM to TO, according to FLAG. | |
745 | If FLAG is nil then text is shown, while if FLAG is t the text is hidden." | |
746 | (remove-overlays from to 'invisible 'outline) | |
747 | (when flag | |
b7e5bc1c SM |
748 | ;; We use `front-advance' here because the invisible text begins at the |
749 | ;; very end of the heading, before the newline, so text inserted at FROM | |
750 | ;; belongs to the heading rather than to the entry. | |
751 | (let ((o (make-overlay from to nil 'front-advance))) | |
36a77f37 | 752 | (overlay-put o 'invisible 'outline) |
203bef73 KS |
753 | (overlay-put o 'isearch-open-invisible |
754 | (or outline-isearch-open-invisible-function | |
755 | 'outline-isearch-open-invisible)))) | |
36a77f37 JB |
756 | ;; Seems only used by lazy-lock. I.e. obsolete. |
757 | (run-hooks 'outline-view-change-hook)) | |
758 | ||
759 | (defun outline-reveal-toggle-invisible (o hidep) | |
760 | (save-excursion | |
761 | (goto-char (overlay-start o)) | |
762 | (if hidep | |
763 | ;; When hiding the area again, we could just clean it up and let | |
764 | ;; reveal do the rest, by simply doing: | |
765 | ;; (remove-overlays (overlay-start o) (overlay-end o) | |
766 | ;; 'invisible 'outline) | |
48c9ce10 | 767 | ;; |
36a77f37 JB |
768 | ;; That works fine as long as everything is in sync, but if the |
769 | ;; structure of the document is changed while revealing parts of it, | |
770 | ;; the resulting behavior can be ugly. I.e. we need to make | |
771 | ;; sure that we hide exactly a subtree. | |
772 | (progn | |
773 | (let ((end (overlay-end o))) | |
774 | (delete-overlay o) | |
775 | (while (progn | |
776 | (hide-subtree) | |
777 | (outline-next-visible-heading 1) | |
778 | (and (not (eobp)) (< (point) end)))))) | |
779 | ||
780 | ;; When revealing, we just need to reveal sublevels. If point is | |
781 | ;; inside one of the sublevels, reveal will call us again. | |
782 | ;; But we need to preserve the original overlay. | |
783 | (let ((o1 (copy-overlay o))) | |
784 | (overlay-put o 'invisible nil) ;Show (most of) the text. | |
785 | (while (progn | |
786 | (show-entry) | |
787 | (show-children) | |
788 | ;; Normally just the above is needed. | |
789 | ;; But in odd cases, the above might fail to show anything. | |
790 | ;; To avoid an infinite loop, we have to make sure that | |
791 | ;; *something* gets shown. | |
792 | (and (equal (overlay-start o) (overlay-start o1)) | |
793 | (< (point) (overlay-end o)) | |
794 | (= 0 (forward-line 1))))) | |
795 | ;; If still nothing was shown, just kill the damn thing. | |
796 | (when (equal (overlay-start o) (overlay-start o1)) | |
797 | ;; I've seen it happen at the end of buffer. | |
798 | (delete-overlay o1)))))) | |
799 | ||
800 | ;; Function to be set as an outline-isearch-open-invisible' property | |
801 | ;; to the overlay that makes the outline invisible (see | |
802 | ;; `outline-flag-region'). | |
803 | (defun outline-isearch-open-invisible (overlay) | |
804 | ;; We rely on the fact that isearch places point on the matched text. | |
805 | (show-entry)) | |
806 | \f | |
807 | (defun hide-entry () | |
808 | "Hide the body directly following this heading." | |
809 | (interactive) | |
36a77f37 | 810 | (save-excursion |
c95502be | 811 | (outline-back-to-heading) |
e4619728 | 812 | (outline-end-of-heading) |
36a77f37 JB |
813 | (outline-flag-region (point) (progn (outline-next-preface) (point)) t))) |
814 | ||
815 | (defun show-entry () | |
816 | "Show the body directly following this heading. | |
817 | Show the heading too, if it is currently invisible." | |
818 | (interactive) | |
819 | (save-excursion | |
820 | (outline-back-to-heading t) | |
821 | (outline-flag-region (1- (point)) | |
822 | (progn (outline-next-preface) (point)) nil))) | |
823 | ||
824 | (defun hide-body () | |
00958fa2 | 825 | "Hide all body lines in buffer, leaving all headings visible." |
36a77f37 JB |
826 | (interactive) |
827 | (hide-region-body (point-min) (point-max))) | |
828 | ||
829 | (defun hide-region-body (start end) | |
830 | "Hide all body lines in the region, but not headings." | |
831 | ;; Nullify the hook to avoid repeated calls to `outline-flag-region' | |
832 | ;; wasting lots of time running `lazy-lock-fontify-after-outline' | |
833 | ;; and run the hook finally. | |
834 | (let (outline-view-change-hook) | |
835 | (save-excursion | |
836 | (save-restriction | |
837 | (narrow-to-region start end) | |
838 | (goto-char (point-min)) | |
839 | (if (outline-on-heading-p) | |
00958fa2 EZ |
840 | (outline-end-of-heading) |
841 | (outline-next-preface)) | |
36a77f37 JB |
842 | (while (not (eobp)) |
843 | (outline-flag-region (point) | |
844 | (progn (outline-next-preface) (point)) t) | |
845 | (unless (eobp) | |
846 | (forward-char (if (looking-at "\n\n") 2 1)) | |
847 | (outline-end-of-heading)))))) | |
848 | (run-hooks 'outline-view-change-hook)) | |
849 | ||
850 | (defun show-all () | |
851 | "Show all of the text in the buffer." | |
852 | (interactive) | |
853 | (outline-flag-region (point-min) (point-max) nil)) | |
854 | ||
855 | (defun hide-subtree () | |
856 | "Hide everything after this heading at deeper levels." | |
857 | (interactive) | |
858 | (outline-flag-subtree t)) | |
859 | ||
860 | (defun hide-leaves () | |
d8b5b5d5 | 861 | "Hide the body after this heading and at deeper levels." |
36a77f37 | 862 | (interactive) |
36a77f37 | 863 | (save-excursion |
c95502be | 864 | (outline-back-to-heading) |
4af23f81 | 865 | ;; Turned off to fix bug reported by Otto Maddox on 22 Nov 2005. |
d8b5b5d5 | 866 | ;; (outline-end-of-heading) |
36a77f37 JB |
867 | (hide-region-body (point) (progn (outline-end-of-subtree) (point))))) |
868 | ||
869 | (defun show-subtree () | |
870 | "Show everything after this heading at deeper levels." | |
871 | (interactive) | |
872 | (outline-flag-subtree nil)) | |
873 | ||
874 | (defun outline-show-heading () | |
875 | "Show the current heading and move to its end." | |
ca858c64 JL |
876 | (outline-flag-region (- (point) |
877 | (if (bobp) 0 | |
878 | (if (and outline-blank-line | |
879 | (eq (char-before (1- (point))) ?\n)) | |
880 | 2 1))) | |
36a77f37 JB |
881 | (progn (outline-end-of-heading) (point)) |
882 | nil)) | |
883 | ||
884 | (defun hide-sublevels (levels) | |
885 | "Hide everything but the top LEVELS levels of headers, in whole buffer." | |
1e0e9b38 SM |
886 | (interactive (list |
887 | (cond | |
888 | (current-prefix-arg (prefix-numeric-value current-prefix-arg)) | |
889 | ((save-excursion (beginning-of-line) | |
890 | (looking-at outline-regexp)) | |
891 | (funcall outline-level)) | |
892 | (t 1)))) | |
36a77f37 JB |
893 | (if (< levels 1) |
894 | (error "Must keep at least one level of headers")) | |
8d683c8e SM |
895 | (save-excursion |
896 | (let* (outline-view-change-hook | |
897 | (beg (progn | |
898 | (goto-char (point-min)) | |
899 | ;; Skip the prelude, if any. | |
900 | (unless (outline-on-heading-p t) (outline-next-heading)) | |
901 | (point))) | |
902 | (end (progn | |
903 | (goto-char (point-max)) | |
904 | ;; Keep empty last line, if available. | |
905 | (if (bolp) (1- (point)) (point))))) | |
3d0dd8ff CY |
906 | (if (< end beg) |
907 | (setq beg (prog1 end (setq end beg)))) | |
36a77f37 | 908 | ;; First hide everything. |
8d683c8e | 909 | (outline-flag-region beg end t) |
36a77f37 JB |
910 | ;; Then unhide the top level headers. |
911 | (outline-map-region | |
912 | (lambda () | |
913 | (if (<= (funcall outline-level) levels) | |
801ba3ba SM |
914 | (outline-show-heading))) |
915 | beg end) | |
916 | ;; Finally unhide any trailing newline. | |
917 | (goto-char (point-max)) | |
918 | (if (and (bolp) (not (bobp)) (outline-invisible-p (1- (point)))) | |
919 | (outline-flag-region (1- (point)) (point) nil)))) | |
36a77f37 JB |
920 | (run-hooks 'outline-view-change-hook)) |
921 | ||
922 | (defun hide-other () | |
923 | "Hide everything except current body and parent and top-level headings." | |
924 | (interactive) | |
925 | (hide-sublevels 1) | |
926 | (let (outline-view-change-hook) | |
927 | (save-excursion | |
928 | (outline-back-to-heading t) | |
929 | (show-entry) | |
6e32922d | 930 | (while (condition-case nil (progn (outline-up-heading 1 t) (not (bobp))) |
36a77f37 JB |
931 | (error nil)) |
932 | (outline-flag-region (1- (point)) | |
933 | (save-excursion (forward-line 1) (point)) | |
934 | nil)))) | |
935 | (run-hooks 'outline-view-change-hook)) | |
936 | ||
937 | (defun outline-toggle-children () | |
938 | "Show or hide the current subtree depending on its current state." | |
939 | (interactive) | |
c95502be JL |
940 | (save-excursion |
941 | (outline-back-to-heading) | |
942 | (if (not (outline-invisible-p (line-end-position))) | |
943 | (hide-subtree) | |
944 | (show-children) | |
945 | (show-entry)))) | |
36a77f37 JB |
946 | |
947 | (defun outline-flag-subtree (flag) | |
948 | (save-excursion | |
949 | (outline-back-to-heading) | |
950 | (outline-end-of-heading) | |
951 | (outline-flag-region (point) | |
952 | (progn (outline-end-of-subtree) (point)) | |
953 | flag))) | |
954 | ||
955 | (defun outline-end-of-subtree () | |
956 | (outline-back-to-heading) | |
797d92ed | 957 | (let ((first t) |
36a77f37 JB |
958 | (level (funcall outline-level))) |
959 | (while (and (not (eobp)) | |
960 | (or first (> (funcall outline-level) level))) | |
961 | (setq first nil) | |
962 | (outline-next-heading)) | |
49bb7f01 RS |
963 | (if (and (bolp) (not (eolp))) |
964 | ;; We stopped at a nonempty line (the next heading). | |
36a77f37 JB |
965 | (progn |
966 | ;; Go to end of line before heading | |
ca858c64 JL |
967 | (forward-char -1) |
968 | (if (and outline-blank-line (bolp)) | |
969 | ;; leave blank line before heading | |
970 | (forward-char -1)))))) | |
36a77f37 JB |
971 | \f |
972 | (defun show-branches () | |
973 | "Show all subheadings of this heading, but not their bodies." | |
974 | (interactive) | |
975 | (show-children 1000)) | |
976 | ||
977 | (defun show-children (&optional level) | |
978 | "Show all direct subheadings of this heading. | |
979 | Prefix arg LEVEL is how many levels below the current level should be shown. | |
980 | Default is enough to cause the following heading to appear." | |
981 | (interactive "P") | |
982 | (setq level | |
983 | (if level (prefix-numeric-value level) | |
984 | (save-excursion | |
985 | (outline-back-to-heading) | |
986 | (let ((start-level (funcall outline-level))) | |
987 | (outline-next-heading) | |
988 | (if (eobp) | |
989 | 1 | |
990 | (max 1 (- (funcall outline-level) start-level))))))) | |
991 | (let (outline-view-change-hook) | |
992 | (save-excursion | |
993 | (outline-back-to-heading) | |
994 | (setq level (+ level (funcall outline-level))) | |
995 | (outline-map-region | |
996 | (lambda () | |
997 | (if (<= (funcall outline-level) level) | |
998 | (outline-show-heading))) | |
999 | (point) | |
1000 | (progn (outline-end-of-subtree) | |
1001 | (if (eobp) (point-max) (1+ (point))))))) | |
1002 | (run-hooks 'outline-view-change-hook)) | |
1003 | ||
1004 | \f | |
1005 | ||
1006 | (defun outline-up-heading (arg &optional invisible-ok) | |
1007 | "Move to the visible heading line of which the present line is a subheading. | |
1008 | With argument, move up ARG levels. | |
1009 | If INVISIBLE-OK is non-nil, also consider invisible lines." | |
1010 | (interactive "p") | |
e4619728 JL |
1011 | (and (eq this-command 'outline-up-heading) |
1012 | (or (eq last-command 'outline-up-heading) (push-mark))) | |
36a77f37 JB |
1013 | (outline-back-to-heading invisible-ok) |
1014 | (let ((start-level (funcall outline-level))) | |
d405bc15 MR |
1015 | (when (<= start-level 1) |
1016 | (error "Already at top level of the outline")) | |
36a77f37 JB |
1017 | (while (and (> start-level 1) (> arg 0) (not (bobp))) |
1018 | (let ((level start-level)) | |
1019 | (while (not (or (< level start-level) (bobp))) | |
1020 | (if invisible-ok | |
1021 | (outline-previous-heading) | |
1022 | (outline-previous-visible-heading 1)) | |
1023 | (setq level (funcall outline-level))) | |
1024 | (setq start-level level)) | |
1025 | (setq arg (- arg 1)))) | |
1026 | (looking-at outline-regexp)) | |
1027 | ||
1028 | (defun outline-forward-same-level (arg) | |
1029 | "Move forward to the ARG'th subheading at same level as this one. | |
1030 | Stop at the first and last subheadings of a superior heading." | |
1031 | (interactive "p") | |
1032 | (outline-back-to-heading) | |
1033 | (while (> arg 0) | |
1034 | (let ((point-to-move-to (save-excursion | |
1035 | (outline-get-next-sibling)))) | |
1036 | (if point-to-move-to | |
1037 | (progn | |
1038 | (goto-char point-to-move-to) | |
1039 | (setq arg (1- arg))) | |
1040 | (progn | |
1041 | (setq arg 0) | |
1042 | (error "No following same-level heading")))))) | |
1043 | ||
1044 | (defun outline-get-next-sibling () | |
29779b2d CY |
1045 | "Move to next heading of the same level, and return point. |
1046 | If there is no such heading, return nil." | |
36a77f37 JB |
1047 | (let ((level (funcall outline-level))) |
1048 | (outline-next-visible-heading 1) | |
1049 | (while (and (not (eobp)) (> (funcall outline-level) level)) | |
1050 | (outline-next-visible-heading 1)) | |
1051 | (if (or (eobp) (< (funcall outline-level) level)) | |
1052 | nil | |
1053 | (point)))) | |
1054 | ||
1055 | (defun outline-backward-same-level (arg) | |
1056 | "Move backward to the ARG'th subheading at same level as this one. | |
1057 | Stop at the first and last subheadings of a superior heading." | |
1058 | (interactive "p") | |
1059 | (outline-back-to-heading) | |
1060 | (while (> arg 0) | |
1061 | (let ((point-to-move-to (save-excursion | |
1062 | (outline-get-last-sibling)))) | |
1063 | (if point-to-move-to | |
1064 | (progn | |
1065 | (goto-char point-to-move-to) | |
1066 | (setq arg (1- arg))) | |
1067 | (progn | |
1068 | (setq arg 0) | |
1069 | (error "No previous same-level heading")))))) | |
1070 | ||
1071 | (defun outline-get-last-sibling () | |
29779b2d CY |
1072 | "Move to previous heading of the same level, and return point. |
1073 | If there is no such heading, return nil." | |
1074 | (let ((opoint (point)) | |
1075 | (level (funcall outline-level))) | |
36a77f37 | 1076 | (outline-previous-visible-heading 1) |
29779b2d CY |
1077 | (when (and (/= (point) opoint) (outline-on-heading-p)) |
1078 | (while (and (> (funcall outline-level) level) | |
1079 | (not (bobp))) | |
1080 | (outline-previous-visible-heading 1)) | |
1081 | (if (< (funcall outline-level) level) | |
1082 | nil | |
1083 | (point))))) | |
36a77f37 JB |
1084 | \f |
1085 | (defun outline-headers-as-kill (beg end) | |
1086 | "Save the visible outline headers in region at the start of the kill ring. | |
1087 | ||
1088 | Text shown between the headers isn't copied. Two newlines are | |
1089 | inserted between saved headers. Yanking the result may be a | |
1090 | convenient way to make a table of contents of the buffer." | |
1091 | (interactive "r") | |
1092 | (save-excursion | |
1093 | (save-restriction | |
1094 | (narrow-to-region beg end) | |
1095 | (goto-char (point-min)) | |
1096 | (let ((buffer (current-buffer)) | |
1097 | start end) | |
1098 | (with-temp-buffer | |
1099 | (with-current-buffer buffer | |
1100 | ;; Boundary condition: starting on heading: | |
1101 | (when (outline-on-heading-p) | |
1102 | (outline-back-to-heading) | |
1103 | (setq start (point) | |
1104 | end (progn (outline-end-of-heading) | |
1105 | (point))) | |
1106 | (insert-buffer-substring buffer start end) | |
1107 | (insert "\n\n"))) | |
1108 | (let ((temp-buffer (current-buffer))) | |
1109 | (with-current-buffer buffer | |
1110 | (while (outline-next-heading) | |
1111 | (unless (outline-invisible-p) | |
1112 | (setq start (point) | |
1113 | end (progn (outline-end-of-heading) (point))) | |
1114 | (with-current-buffer temp-buffer | |
1115 | (insert-buffer-substring buffer start end) | |
1116 | (insert "\n\n")))))) | |
1117 | (kill-new (buffer-string))))))) | |
1118 | ||
1119 | (provide 'outline) | |
1120 | (provide 'noutline) | |
1121 | ||
1122 | ;;; outline.el ends here |