lisp/obsolete/ooutline.el

   1 ;;; ooutline.el --- outline mode commands for Emacs
   2
   3 ;; Copyright (C) 1986, 1993, 1994, 1997 Free Software Foundation, Inc.
   4
   5 ;; Maintainer: FSF
   6 ;; Keywords: outlines
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 2, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 ;; Boston, MA 02111-1307, USA.
  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 ;;; Code:
  32
  33 ;; Jan '86, Some new features added by Peter Desnoyers and rewritten by RMS.
  34
  35 (defgroup outlines nil
  36   "Support for hierarchical outlining"
  37   :prefix "outline-"
  38   :group 'editing)
  39
  40
  41 (defcustom outline-regexp nil
  42   "*Regular expression to match the beginning of a heading.
  43 Any line whose beginning matches this regexp is considered to start a heading.
  44 The recommended way to set this is with a Local Variables: list
  45 in the file it applies to.  See also outline-heading-end-regexp."
  46   :type '(choice regexp (const nil))
  47   :group 'outlines)
  48
  49 ;; Can't initialize this in the defvar above -- some major modes have
  50 ;; already assigned a local value to it.
  51 (or (default-value 'outline-regexp)
  52     (setq-default outline-regexp "[*\^L]+"))
  53
  54 (defcustom outline-heading-end-regexp "[\n\^M]"
  55   "*Regular expression to match the end of a heading line.
  56 You can assume that point is at the beginning of a heading when this
  57 regexp is searched for.  The heading ends at the end of the match.
  58 The recommended way to set this is with a \"Local Variables:\" list
  59 in the file it applies to."
  60   :type 'regexp
  61   :group 'outlines)
  62
  63 (defvar outline-mode-prefix-map nil)
  64
  65 (if outline-mode-prefix-map
  66     nil
  67   (setq outline-mode-prefix-map (make-sparse-keymap))
  68   (define-key outline-mode-prefix-map "\C-n" 'outline-next-visible-heading)
  69   (define-key outline-mode-prefix-map "\C-p" 'outline-previous-visible-heading)
  70   (define-key outline-mode-prefix-map "\C-i" 'show-children)
  71   (define-key outline-mode-prefix-map "\C-s" 'show-subtree)
  72   (define-key outline-mode-prefix-map "\C-d" 'hide-subtree)
  73   (define-key outline-mode-prefix-map "\C-u" 'outline-up-heading)
  74   (define-key outline-mode-prefix-map "\C-f" 'outline-forward-same-level)
  75   (define-key outline-mode-prefix-map "\C-b" 'outline-backward-same-level)
  76   (define-key outline-mode-prefix-map "\C-t" 'hide-body)
  77   (define-key outline-mode-prefix-map "\C-a" 'show-all)
  78   (define-key outline-mode-prefix-map "\C-c" 'hide-entry)
  79   (define-key outline-mode-prefix-map "\C-e" 'show-entry)
  80   (define-key outline-mode-prefix-map "\C-l" 'hide-leaves)
  81   (define-key outline-mode-prefix-map "\C-k" 'show-branches)
  82   (define-key outline-mode-prefix-map "\C-q" 'hide-sublevels)
  83   (define-key outline-mode-prefix-map "\C-o" 'hide-other))
  84
  85 (defvar outline-mode-menu-bar-map nil)
  86 (if outline-mode-menu-bar-map
  87     nil
  88   (setq outline-mode-menu-bar-map (make-sparse-keymap))
  89
  90   (define-key outline-mode-menu-bar-map [hide]
  91     (cons "Hide" (make-sparse-keymap "Hide")))
  92
  93   (define-key outline-mode-menu-bar-map [hide hide-other]
  94     '("Hide Other" . hide-other))
  95   (define-key outline-mode-menu-bar-map [hide hide-sublevels]
  96     '("Hide Sublevels" . hide-sublevels))
  97   (define-key outline-mode-menu-bar-map [hide hide-subtree]
  98     '("Hide Subtree" . hide-subtree))
  99   (define-key outline-mode-menu-bar-map [hide hide-entry]
 100     '("Hide Entry" . hide-entry))
 101   (define-key outline-mode-menu-bar-map [hide hide-body]
 102     '("Hide Body" . hide-body))
 103   (define-key outline-mode-menu-bar-map [hide hide-leaves]
 104     '("Hide Leaves" . hide-leaves))
 105
 106   (define-key outline-mode-menu-bar-map [show]
 107     (cons "Show" (make-sparse-keymap "Show")))
 108
 109   (define-key outline-mode-menu-bar-map [show show-subtree]
 110     '("Show Subtree" . show-subtree))
 111   (define-key outline-mode-menu-bar-map [show show-children]
 112     '("Show Children" . show-children))
 113   (define-key outline-mode-menu-bar-map [show show-branches]
 114     '("Show Branches" . show-branches))
 115   (define-key outline-mode-menu-bar-map [show show-entry]
 116     '("Show Entry" . show-entry))
 117   (define-key outline-mode-menu-bar-map [show show-all]
 118     '("Show All" . show-all))
 119
 120   (define-key outline-mode-menu-bar-map [headings]
 121     (cons "Headings" (make-sparse-keymap "Headings")))
 122
 123   (define-key outline-mode-menu-bar-map [headings outline-backward-same-level]
 124     '("Previous Same Level" . outline-backward-same-level))
 125   (define-key outline-mode-menu-bar-map [headings outline-forward-same-level]
 126     '("Next Same Level" . outline-forward-same-level))
 127   (define-key outline-mode-menu-bar-map [headings outline-previous-visible-heading]
 128     '("Previous" . outline-previous-visible-heading))
 129   (define-key outline-mode-menu-bar-map [headings outline-next-visible-heading]
 130     '("Next" . outline-next-visible-heading))
 131   (define-key outline-mode-menu-bar-map [headings outline-up-heading]
 132     '("Up" . outline-up-heading)))
 133
 134 (defvar outline-mode-map nil "")
 135
 136 (if outline-mode-map
 137     nil
 138   (setq outline-mode-map (nconc (make-sparse-keymap) text-mode-map))
 139   (define-key outline-mode-map "\C-c" outline-mode-prefix-map)
 140   (define-key outline-mode-map [menu-bar] outline-mode-menu-bar-map))
 141
 142 (defcustom outline-minor-mode nil
 143   "Non-nil if using Outline mode as a minor mode of some other mode."
 144   :type 'boolean
 145   :group 'outlines)
 146 (make-variable-buffer-local 'outline-minor-mode)
 147 (put 'outline-minor-mode 'permanent-local t)
 148 (or (assq 'outline-minor-mode minor-mode-alist)
 149     (setq minor-mode-alist (append minor-mode-alist
 150                                    (list '(outline-minor-mode " Outl")))))
 151
 152 (defvar outline-font-lock-keywords
 153   '(;; Highlight headings according to the level.
 154     ("^\\([*]+\\)[ \t]*\\([^\n\r]+\\)?[ \t]*[\n\r]"
 155      (1 font-lock-string-face)
 156      (2 (let ((len (- (match-end 1) (match-beginning 1))))
 157           (or (cdr (assq len '((1 . font-lock-function-name-face)
 158                                (2 . font-lock-keyword-face)
 159                                (3 . font-lock-comment-face))))
 160               font-lock-variable-name-face))
 161         nil t))
 162     ;; Highlight citations of the form [1] and [Mar94].
 163     ("\\[\\([[:upper:]][[:alpha:]]+\\)*[0-9]+\\]" . font-lock-type-face))
 164   "Additional expressions to highlight in Outline mode.")
 165
 166 (defun outline-mode ()
 167   "Set major mode for editing outlines with selective display.
 168 Headings are lines which start with asterisks: one for major headings,
 169 two for subheadings, etc.  Lines not starting with asterisks are body lines.
 170
 171 Body text or subheadings under a heading can be made temporarily
 172 invisible, or visible again.  Invisible lines are attached to the end
 173 of the heading, so they move with it, if the line is killed and yanked
 174 back.  A heading with text hidden under it is marked with an ellipsis (...).
 175
 176 Commands:\\<outline-mode-map>
 177 \\[outline-next-visible-heading]   outline-next-visible-heading      move by visible headings
 178 \\[outline-previous-visible-heading]   outline-previous-visible-heading
 179 \\[outline-forward-same-level]   outline-forward-same-level        similar but skip subheadings
 180 \\[outline-backward-same-level]   outline-backward-same-level
 181 \\[outline-up-heading]   outline-up-heading                 move from subheading to heading
 182
 183 \\[hide-body]   make all text invisible (not headings).
 184 \\[show-all]    make everything in buffer visible.
 185
 186 The remaining commands are used when point is on a heading line.
 187 They apply to some of the body or subheadings of that heading.
 188 \\[hide-subtree]   hide-subtree make body and subheadings invisible.
 189 \\[show-subtree]   show-subtree make body and subheadings visible.
 190 \\[show-children]   show-children       make direct subheadings visible.
 191                  No effect on body, or subheadings 2 or more levels down.
 192                  With arg N, affects subheadings N levels down.
 193 \\[hide-entry]     make immediately following body invisible.
 194 \\[show-entry]     make it visible.
 195 \\[hide-leaves]    make body under heading and under its subheadings invisible.
 196                      The subheadings remain visible.
 197 \\[show-branches]  make all subheadings at all levels visible.
 198
 199 The variable `outline-regexp' can be changed to control what is a heading.
 200 A line is a heading if `outline-regexp' matches something at the
 201 beginning of the line.  The longer the match, the deeper the level.
 202
 203 Turning on outline mode calls the value of `text-mode-hook' and then of
 204 `outline-mode-hook', if they are non-nil."
 205   (interactive)
 206   (kill-all-local-variables)
 207   (setq selective-display t)
 208   (use-local-map outline-mode-map)
 209   (setq mode-name "Outline")
 210   (setq major-mode 'outline-mode)
 211   (define-abbrev-table 'text-mode-abbrev-table ())
 212   (setq local-abbrev-table text-mode-abbrev-table)
 213   (set-syntax-table text-mode-syntax-table)
 214   (make-local-variable 'paragraph-start)
 215   (setq paragraph-start (concat paragraph-start "\\|\\("
 216                                 outline-regexp "\\)"))
 217   ;; Inhibit auto-filling of header lines.
 218   (make-local-variable 'auto-fill-inhibit-regexp)
 219   (setq auto-fill-inhibit-regexp outline-regexp)
 220   (make-local-variable 'paragraph-separate)
 221   (setq paragraph-separate (concat paragraph-separate "\\|\\("
 222                                    outline-regexp "\\)"))
 223   (make-local-variable 'font-lock-defaults)
 224   (setq font-lock-defaults '(outline-font-lock-keywords t))
 225   (make-local-variable 'change-major-mode-hook)
 226   (add-hook 'change-major-mode-hook 'show-all)
 227   (run-hooks 'text-mode-hook 'outline-mode-hook))
 228
 229 (defcustom outline-minor-mode-prefix "\C-c@"
 230   "*Prefix key to use for Outline commands in Outline minor mode.
 231 The value of this variable is checked as part of loading Outline mode.
 232 After that, changing the prefix key requires manipulating keymaps."
 233   :type 'string
 234   :group 'outlines)
 235
 236 (defvar outline-minor-mode-map nil)
 237 (if outline-minor-mode-map
 238     nil
 239   (setq outline-minor-mode-map (make-sparse-keymap))
 240   (define-key outline-minor-mode-map [menu-bar]
 241     outline-mode-menu-bar-map)
 242   (define-key outline-minor-mode-map outline-minor-mode-prefix
 243     outline-mode-prefix-map))
 244
 245 (or (assq 'outline-minor-mode minor-mode-map-alist)
 246     (setq minor-mode-map-alist
 247           (cons (cons 'outline-minor-mode outline-minor-mode-map)
 248                 minor-mode-map-alist)))
 249
 250 (defun outline-minor-mode (&optional arg)
 251   "Toggle Outline minor mode.
 252 With arg, turn Outline minor mode on if arg is positive, off otherwise.
 253 See the command `outline-mode' for more information on this mode."
 254   (interactive "P")
 255   (setq outline-minor-mode
 256         (if (null arg) (not outline-minor-mode)
 257           (> (prefix-numeric-value arg) 0)))
 258   (if outline-minor-mode
 259       (progn
 260         (setq selective-display t)
 261         (run-hooks 'outline-minor-mode-hook))
 262     (setq selective-display nil))
 263   ;; When turning off outline mode, get rid of any ^M's.
 264   (or outline-minor-mode
 265       (outline-flag-region (point-min) (point-max) ?\n))
 266   (force-mode-line-update))
 267 \f
 268 (defvar outline-level 'outline-level
 269   "Function of no args to compute a header's nesting level in an outline.
 270 It can assume point is at the beginning of a header line.")
 271
 272 ;; This used to count columns rather than characters, but that made ^L
 273 ;; appear to be at level 2 instead of 1.  Columns would be better for
 274 ;; tab handling, but the default regexp doesn't use tabs, and anyone
 275 ;; who changes the regexp can also redefine the outline-level variable
 276 ;; as appropriate.
 277 (defun outline-level ()
 278   "Return the depth to which a statement is nested in the outline.
 279 Point must be at the beginning of a header line.  This is actually
 280 the number of characters that `outline-regexp' matches."
 281   (save-excursion
 282     (looking-at outline-regexp)
 283     (- (match-end 0) (match-beginning 0))))
 284
 285 (defun outline-next-preface ()
 286   "Skip forward to just before the next heading line.
 287 If there's no following heading line, stop before the newline
 288 at the end of the buffer."
 289   (if (re-search-forward (concat "[\n\^M]\\(" outline-regexp "\\)")
 290                          nil 'move)
 291       (goto-char (match-beginning 0)))
 292   (if (memq (preceding-char) '(?\n ?\^M))
 293       (forward-char -1)))
 294
 295 (defun outline-next-heading ()
 296   "Move to the next (possibly invisible) heading line."
 297   (interactive)
 298   (if (re-search-forward (concat "[\n\^M]\\(" outline-regexp "\\)")
 299                          nil 'move)
 300       (goto-char (1+ (match-beginning 0)))))
 301
 302 (defun outline-back-to-heading ()
 303   "Move to previous heading line, or beg of this line if it's a heading.
 304 Only visible heading lines are considered."
 305   (beginning-of-line)
 306   (or (outline-on-heading-p)
 307       (re-search-backward (concat "^\\(" outline-regexp "\\)") nil t)
 308       (error "before first heading")))
 309
 310 (defun outline-on-heading-p ()
 311   "Return t if point is on a (visible) heading line."
 312   (save-excursion
 313     (beginning-of-line)
 314     (and (bolp)
 315          (looking-at outline-regexp))))
 316
 317 (defun outline-end-of-heading ()
 318   (if (re-search-forward outline-heading-end-regexp nil 'move)
 319       (forward-char -1)))
 320
 321 (defun outline-next-visible-heading (arg)
 322   "Move to the next visible heading line.
 323 With argument, repeats or can move backward if negative.
 324 A heading line is one that starts with a `*' (or that
 325 `outline-regexp' matches)."
 326   (interactive "p")
 327   (if (< arg 0)
 328       (beginning-of-line)
 329     (end-of-line))
 330   (or (re-search-forward (concat "^\\(" outline-regexp "\\)") nil t arg)
 331       (error ""))
 332   (beginning-of-line))
 333
 334 (defun outline-previous-visible-heading (arg)
 335   "Move to the previous heading line.
 336 With argument, repeats or can move forward if negative.
 337 A heading line is one that starts with a `*' (or that
 338 `outline-regexp' matches)."
 339   (interactive "p")
 340   (outline-next-visible-heading (- arg)))
 341
 342 (defun outline-flag-region (from to flag)
 343   "Hides or shows lines from FROM to TO, according to FLAG.
 344 If FLAG is `\\n' (newline character) then text is shown,
 345 while if FLAG is `\\^M' (control-M) the text is hidden."
 346   (let (buffer-read-only)
 347     (subst-char-in-region from to
 348                           (if (= flag ?\n) ?\^M ?\n)
 349                           flag t)))
 350 \f
 351 (defun hide-entry ()
 352   "Hide the body directly following this heading."
 353   (interactive)
 354   (outline-back-to-heading)
 355   (outline-end-of-heading)
 356   (save-excursion
 357    (outline-flag-region (point) (progn (outline-next-preface) (point)) ?\^M)))
 358
 359 (defun show-entry ()
 360   "Show the body directly following this heading."
 361   (interactive)
 362   (save-excursion
 363    (outline-flag-region (point) (progn (outline-next-preface) (point)) ?\n)))
 364
 365 (defun hide-body ()
 366   "Hide all of buffer except headings."
 367   (interactive)
 368   (hide-region-body (point-min) (point-max)))
 369
 370 (defun hide-region-body (start end)
 371   "Hide all body lines in the region, but not headings."
 372   (save-excursion
 373     (save-restriction
 374       (narrow-to-region start end)
 375       (goto-char (point-min))
 376       (if (outline-on-heading-p)
 377           (outline-end-of-heading))
 378       (while (not (eobp))
 379         (outline-flag-region (point)
 380                              (progn (outline-next-preface) (point)) ?\^M)
 381         (if (not (eobp))
 382             (progn
 383               (forward-char
 384                (if (looking-at "[\n\^M][\n\^M]")
 385                    2 1))
 386               (outline-end-of-heading)))))))
 387
 388 (defun show-all ()
 389   "Show all of the text in the buffer."
 390   (interactive)
 391   (outline-flag-region (point-min) (point-max) ?\n))
 392
 393 (defun hide-subtree ()
 394   "Hide everything after this heading at deeper levels."
 395   (interactive)
 396   (outline-flag-subtree ?\^M))
 397
 398 (defun hide-leaves ()
 399   "Hide all body after this heading at deeper levels."
 400   (interactive)
 401   (outline-back-to-heading)
 402   (outline-end-of-heading)
 403   (hide-region-body (point) (progn (outline-end-of-subtree) (point))))
 404
 405 (defun show-subtree ()
 406   "Show everything after this heading at deeper levels."
 407   (interactive)
 408   (outline-flag-subtree ?\n))
 409
 410 (defun hide-sublevels (levels)
 411   "Hide everything but the top LEVELS levels of headers, in whole buffer."
 412   (interactive "p")
 413   (if (< levels 1)
 414       (error "Must keep at least one level of headers"))
 415   (setq levels (1- levels))
 416   (save-excursion
 417     (goto-char (point-min))
 418     ;; Keep advancing to the next top-level heading.
 419     (while (or (and (bobp) (outline-on-heading-p))
 420                (outline-next-heading))
 421       (let ((end (save-excursion (outline-end-of-subtree) (point))))
 422         ;; Hide everything under that.
 423         (outline-flag-region (point) end ?\^M)
 424         ;; Show the first LEVELS levels under that.
 425         (if (> levels 0)
 426             (show-children levels))
 427         ;; Move to the next, since we already found it.
 428         (goto-char end)))))
 429
 430 (defun hide-other ()
 431   "Hide everything except for the current body and the parent headings."
 432   (interactive)
 433   (hide-sublevels 1)
 434   (let ((last (point))
 435         (pos (point)))
 436     (while (save-excursion
 437              (and (re-search-backward "[\n\r]" nil t)
 438                   (eq (following-char) ?\r)))
 439       (save-excursion
 440         (beginning-of-line)
 441         (if (eq last (point))
 442             (progn
 443               (outline-next-heading)
 444               (outline-flag-region last (point) ?\n))
 445           (show-children)
 446           (setq last (point)))))))
 447
 448 (defun outline-flag-subtree (flag)
 449   (save-excursion
 450     (outline-back-to-heading)
 451     (outline-end-of-heading)
 452     (outline-flag-region (point)
 453                           (progn (outline-end-of-subtree) (point))
 454                           flag)))
 455
 456 (defun outline-end-of-subtree ()
 457   (outline-back-to-heading)
 458   (let ((opoint (point))
 459         (first t)
 460         (level (funcall outline-level)))
 461     (while (and (not (eobp))
 462                 (or first (> (funcall outline-level) level)))
 463       (setq first nil)
 464       (outline-next-heading))
 465     (if (memq (preceding-char) '(?\n ?\^M))
 466         (progn
 467           ;; Go to end of line before heading
 468           (forward-char -1)
 469           (if (memq (preceding-char) '(?\n ?\^M))
 470               ;; leave blank line before heading
 471               (forward-char -1))))))
 472 \f
 473 (defun show-branches ()
 474   "Show all subheadings of this heading, but not their bodies."
 475   (interactive)
 476   (show-children 1000))
 477
 478 (defun show-children (&optional level)
 479   "Show all direct subheadings of this heading.
 480 Prefix arg LEVEL is how many levels below the current level should be shown.
 481 Default is enough to cause the following heading to appear."
 482   (interactive "P")
 483   (setq level
 484         (if level (prefix-numeric-value level)
 485           (save-excursion
 486             (outline-back-to-heading)
 487             (let ((start-level (funcall outline-level)))
 488               (outline-next-heading)
 489               (if (eobp)
 490                   1
 491                 (max 1 (- (funcall outline-level) start-level)))))))
 492   (save-excursion
 493     (save-restriction
 494       (outline-back-to-heading)
 495       (setq level (+ level (funcall outline-level)))
 496       (narrow-to-region (point)
 497                         (progn (outline-end-of-subtree)
 498                                (if (eobp) (point-max) (1+ (point)))))
 499       (goto-char (point-min))
 500       (while (and (not (eobp))
 501                   (progn
 502                     (outline-next-heading)
 503                     (not (eobp))))
 504         (if (<= (funcall outline-level) level)
 505             (save-excursion
 506               (outline-flag-region (save-excursion
 507                                      (forward-char -1)
 508                                      (if (memq (preceding-char) '(?\n ?\^M))
 509                                          (forward-char -1))
 510                                      (point))
 511                                    (progn (outline-end-of-heading) (point))
 512                                    ?\n)))))))
 513 \f
 514 (defun outline-up-heading (arg)
 515   "Move to the heading line of which the present line is a subheading.
 516 With argument, move up ARG levels."
 517   (interactive "p")
 518   (outline-back-to-heading)
 519   (if (eq (funcall outline-level) 1)
 520       (error ""))
 521   (while (and (> (funcall outline-level) 1)
 522               (> arg 0)
 523               (not (bobp)))
 524     (let ((present-level (funcall outline-level)))
 525       (while (not (< (funcall outline-level) present-level))
 526         (outline-previous-visible-heading 1))
 527       (setq arg (- arg 1)))))
 528
 529 (defun outline-forward-same-level (arg)
 530   "Move forward to the ARG'th subheading at same level as this one.
 531 Stop at the first and last subheadings of a superior heading."
 532   (interactive "p")
 533   (outline-back-to-heading)
 534   (while (> arg 0)
 535     (let ((point-to-move-to (save-excursion
 536                               (outline-get-next-sibling))))
 537       (if point-to-move-to
 538           (progn
 539             (goto-char point-to-move-to)
 540             (setq arg (1- arg)))
 541         (progn
 542           (setq arg 0)
 543           (error ""))))))
 544
 545 (defun outline-get-next-sibling ()
 546   "Move to next heading of the same level, and return point or nil if none."
 547   (let ((level (funcall outline-level)))
 548     (outline-next-visible-heading 1)
 549     (while (and (> (funcall outline-level) level)
 550                 (not (eobp)))
 551       (outline-next-visible-heading 1))
 552     (if (< (funcall outline-level) level)
 553         nil
 554       (point))))
 555
 556 (defun outline-backward-same-level (arg)
 557   "Move backward to the ARG'th subheading at same level as this one.
 558 Stop at the first and last subheadings of a superior heading."
 559   (interactive "p")
 560   (outline-back-to-heading)
 561   (while (> arg 0)
 562     (let ((point-to-move-to (save-excursion
 563                               (outline-get-last-sibling))))
 564       (if point-to-move-to
 565           (progn
 566             (goto-char point-to-move-to)
 567             (setq arg (1- arg)))
 568         (progn
 569           (setq arg 0)
 570           (error ""))))))
 571
 572 (defun outline-get-last-sibling ()
 573   "Move to next heading of the same level, and return point or nil if none."
 574   (let ((level (funcall outline-level)))
 575     (outline-previous-visible-heading 1)
 576     (while (and (> (funcall outline-level) level)
 577                 (not (bobp)))
 578       (outline-previous-visible-heading 1))
 579     (if (< (funcall outline-level) level)
 580         nil
 581         (point))))
 582
 583 (provide 'outline)
 584
 585 ;;; ooutline.el ends here