lisp/obsolete/ooutline.el

   1 ;;; ooutline.el --- outline mode commands for Emacs
   2
   3 ;; Copyright (C) 1986, 1993, 1994, 1997, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007, 2008 Free Software Foundation, Inc.
   5
   6 ;; Maintainer: FSF
   7 ;; Keywords: outlines
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 3, or (at your option)
  14 ;; any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  23 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  24 ;; Boston, MA 02110-1301, USA.
  25
  26 ;;; Commentary:
  27
  28 ;; This package is a major mode for editing outline-format documents.
  29 ;; An outline can be `abstracted' to show headers at any given level,
  30 ;; with all stuff below hidden.  See the Emacs manual for details.
  31
  32 ;;; Code:
  33
  34 ;; Jan '86, Some new features added by Peter Desnoyers and rewritten by RMS.
  35
  36 (defgroup outlines nil
  37   "Support for hierarchical outlining."
  38   :prefix "outline-"
  39   :group 'editing)
  40
  41
  42 (defcustom outline-regexp nil
  43   "*Regular expression to match the beginning of a heading.
  44 Any line whose beginning matches this regexp is considered to start a heading.
  45 The recommended way to set this is with a Local Variables: list
  46 in the file it applies to.  See also outline-heading-end-regexp."
  47   :type '(choice regexp (const nil))
  48   :group 'outlines)
  49
  50 ;; Can't initialize this in the defvar above -- some major modes have
  51 ;; already assigned a local value to it.
  52 (or (default-value 'outline-regexp)
  53     (setq-default outline-regexp "[*\^L]+"))
  54
  55 (defcustom outline-heading-end-regexp "[\n\^M]"
  56   "*Regular expression to match the end of a heading line.
  57 You can assume that point is at the beginning of a heading when this
  58 regexp is searched for.  The heading ends at the end of the match.
  59 The recommended way to set this is with a \"Local Variables:\" list
  60 in the file it applies to."
  61   :type 'regexp
  62   :group 'outlines)
  63
  64 (defvar outline-mode-prefix-map nil)
  65
  66 (if outline-mode-prefix-map
  67     nil
  68   (setq outline-mode-prefix-map (make-sparse-keymap))
  69   (define-key outline-mode-prefix-map "\C-n" 'outline-next-visible-heading)
  70   (define-key outline-mode-prefix-map "\C-p" 'outline-previous-visible-heading)
  71   (define-key outline-mode-prefix-map "\C-i" 'show-children)
  72   (define-key outline-mode-prefix-map "\C-s" 'show-subtree)
  73   (define-key outline-mode-prefix-map "\C-d" 'hide-subtree)
  74   (define-key outline-mode-prefix-map "\C-u" 'outline-up-heading)
  75   (define-key outline-mode-prefix-map "\C-f" 'outline-forward-same-level)
  76   (define-key outline-mode-prefix-map "\C-b" 'outline-backward-same-level)
  77   (define-key outline-mode-prefix-map "\C-t" 'hide-body)
  78   (define-key outline-mode-prefix-map "\C-a" 'show-all)
  79   (define-key outline-mode-prefix-map "\C-c" 'hide-entry)
  80   (define-key outline-mode-prefix-map "\C-e" 'show-entry)
  81   (define-key outline-mode-prefix-map "\C-l" 'hide-leaves)
  82   (define-key outline-mode-prefix-map "\C-k" 'show-branches)
  83   (define-key outline-mode-prefix-map "\C-q" 'hide-sublevels)
  84   (define-key outline-mode-prefix-map "\C-o" 'hide-other))
  85
  86 (defvar outline-mode-menu-bar-map nil)
  87 (if outline-mode-menu-bar-map
  88     nil
  89   (setq outline-mode-menu-bar-map (make-sparse-keymap))
  90
  91   (define-key outline-mode-menu-bar-map [hide]
  92     (cons "Hide" (make-sparse-keymap "Hide")))
  93
  94   (define-key outline-mode-menu-bar-map [hide hide-other]
  95     '("Hide Other" . hide-other))
  96   (define-key outline-mode-menu-bar-map [hide hide-sublevels]
  97     '("Hide Sublevels" . hide-sublevels))
  98   (define-key outline-mode-menu-bar-map [hide hide-subtree]
  99     '("Hide Subtree" . hide-subtree))
 100   (define-key outline-mode-menu-bar-map [hide hide-entry]
 101     '("Hide Entry" . hide-entry))
 102   (define-key outline-mode-menu-bar-map [hide hide-body]
 103     '("Hide Body" . hide-body))
 104   (define-key outline-mode-menu-bar-map [hide hide-leaves]
 105     '("Hide Leaves" . hide-leaves))
 106
 107   (define-key outline-mode-menu-bar-map [show]
 108     (cons "Show" (make-sparse-keymap "Show")))
 109
 110   (define-key outline-mode-menu-bar-map [show show-subtree]
 111     '("Show Subtree" . show-subtree))
 112   (define-key outline-mode-menu-bar-map [show show-children]
 113     '("Show Children" . show-children))
 114   (define-key outline-mode-menu-bar-map [show show-branches]
 115     '("Show Branches" . show-branches))
 116   (define-key outline-mode-menu-bar-map [show show-entry]
 117     '("Show Entry" . show-entry))
 118   (define-key outline-mode-menu-bar-map [show show-all]
 119     '("Show All" . show-all))
 120
 121   (define-key outline-mode-menu-bar-map [headings]
 122     (cons "Headings" (make-sparse-keymap "Headings")))
 123
 124   (define-key outline-mode-menu-bar-map [headings outline-backward-same-level]
 125     '("Previous Same Level" . outline-backward-same-level))
 126   (define-key outline-mode-menu-bar-map [headings outline-forward-same-level]
 127     '("Next Same Level" . outline-forward-same-level))
 128   (define-key outline-mode-menu-bar-map [headings outline-previous-visible-heading]
 129     '("Previous" . outline-previous-visible-heading))
 130   (define-key outline-mode-menu-bar-map [headings outline-next-visible-heading]
 131     '("Next" . outline-next-visible-heading))
 132   (define-key outline-mode-menu-bar-map [headings outline-up-heading]
 133     '("Up" . outline-up-heading)))
 134
 135 (defvar outline-mode-map nil "")
 136
 137 (if outline-mode-map
 138     nil
 139   (setq outline-mode-map (nconc (make-sparse-keymap) text-mode-map))
 140   (define-key outline-mode-map "\C-c" outline-mode-prefix-map)
 141   (define-key outline-mode-map [menu-bar] outline-mode-menu-bar-map))
 142
 143 (defcustom outline-minor-mode nil
 144   "Non-nil if using Outline mode as a minor mode of some other mode."
 145   :type 'boolean
 146   :group 'outlines)
 147 (make-variable-buffer-local 'outline-minor-mode)
 148 (put 'outline-minor-mode 'permanent-local t)
 149 (or (assq 'outline-minor-mode minor-mode-alist)
 150     (setq minor-mode-alist (append minor-mode-alist
 151                                    (list '(outline-minor-mode " Outl")))))
 152
 153 (defvar outline-font-lock-keywords
 154   '(;; Highlight headings according to the level.
 155     ("^\\([*]+\\)[ \t]*\\([^\n\r]+\\)?[ \t]*[\n\r]"
 156      (1 font-lock-string-face)
 157      (2 (let ((len (- (match-end 1) (match-beginning 1))))
 158           (or (cdr (assq len '((1 . font-lock-function-name-face)
 159                                (2 . font-lock-keyword-face)
 160                                (3 . font-lock-comment-face))))
 161               font-lock-variable-name-face))
 162         nil t))
 163     ;; Highlight citations of the form [1] and [Mar94].
 164     ("\\[\\([[:upper:]][[:alpha:]]+\\)*[0-9]+\\]" . font-lock-type-face))
 165   "Additional expressions to highlight in Outline mode.")
 166
 167 (defun outline-mode ()
 168   "Set major mode for editing outlines with selective display.
 169 Headings are lines which start with asterisks: one for major headings,
 170 two for subheadings, etc.  Lines not starting with asterisks are body lines.
 171
 172 Body text or subheadings under a heading can be made temporarily
 173 invisible, or visible again.  Invisible lines are attached to the end
 174 of the heading, so they move with it, if the line is killed and yanked
 175 back.  A heading with text hidden under it is marked with an ellipsis (...).
 176
 177 Commands:\\<outline-mode-map>
 178 \\[outline-next-visible-heading]   outline-next-visible-heading      move by visible headings
 179 \\[outline-previous-visible-heading]   outline-previous-visible-heading
 180 \\[outline-forward-same-level]   outline-forward-same-level        similar but skip subheadings
 181 \\[outline-backward-same-level]   outline-backward-same-level
 182 \\[outline-up-heading]   outline-up-heading                 move from subheading to heading
 183
 184 \\[hide-body]   make all text invisible (not headings).
 185 \\[show-all]    make everything in buffer visible.
 186
 187 The remaining commands are used when point is on a heading line.
 188 They apply to some of the body or subheadings of that heading.
 189 \\[hide-subtree]   hide-subtree make body and subheadings invisible.
 190 \\[show-subtree]   show-subtree make body and subheadings visible.
 191 \\[show-children]   show-children       make direct subheadings visible.
 192                  No effect on body, or subheadings 2 or more levels down.
 193                  With arg N, affects subheadings N levels down.
 194 \\[hide-entry]     make immediately following body invisible.
 195 \\[show-entry]     make it visible.
 196 \\[hide-leaves]    make body under heading and under its subheadings invisible.
 197                      The subheadings remain visible.
 198 \\[show-branches]  make all subheadings at all levels visible.
 199
 200 The variable `outline-regexp' can be changed to control what is a heading.
 201 A line is a heading if `outline-regexp' matches something at the
 202 beginning of the line.  The longer the match, the deeper the level.
 203
 204 Turning on outline mode calls the value of `text-mode-hook' and then of
 205 `outline-mode-hook', if they are non-nil."
 206   (interactive)
 207   (kill-all-local-variables)
 208   (setq selective-display t)
 209   (use-local-map outline-mode-map)
 210   (setq mode-name "Outline")
 211   (setq major-mode 'outline-mode)
 212   (define-abbrev-table 'text-mode-abbrev-table ())
 213   (setq local-abbrev-table text-mode-abbrev-table)
 214   (set-syntax-table text-mode-syntax-table)
 215   (make-local-variable 'paragraph-start)
 216   (setq paragraph-start (concat paragraph-start "\\|\\("
 217                                 outline-regexp "\\)"))
 218   ;; Inhibit auto-filling of header lines.
 219   (make-local-variable 'auto-fill-inhibit-regexp)
 220   (setq auto-fill-inhibit-regexp outline-regexp)
 221   (make-local-variable 'paragraph-separate)
 222   (setq paragraph-separate (concat paragraph-separate "\\|\\("
 223                                    outline-regexp "\\)"))
 224   (make-local-variable 'font-lock-defaults)
 225   (setq font-lock-defaults '(outline-font-lock-keywords t))
 226   (make-local-variable 'change-major-mode-hook)
 227   (add-hook 'change-major-mode-hook 'show-all)
 228   (run-mode-hooks 'text-mode-hook 'outline-mode-hook))
 229
 230 (defcustom outline-minor-mode-prefix "\C-c@"
 231   "*Prefix key to use for Outline commands in Outline minor mode.
 232 The value of this variable is checked as part of loading Outline mode.
 233 After that, changing the prefix key requires manipulating keymaps."
 234   :type 'string
 235   :group 'outlines)
 236
 237 (defvar outline-minor-mode-map nil)
 238 (if outline-minor-mode-map
 239     nil
 240   (setq outline-minor-mode-map (make-sparse-keymap))
 241   (define-key outline-minor-mode-map [menu-bar]
 242     outline-mode-menu-bar-map)
 243   (define-key outline-minor-mode-map outline-minor-mode-prefix
 244     outline-mode-prefix-map))
 245
 246 (or (assq 'outline-minor-mode minor-mode-map-alist)
 247     (setq minor-mode-map-alist
 248           (cons (cons 'outline-minor-mode outline-minor-mode-map)
 249                 minor-mode-map-alist)))
 250
 251 (defun outline-minor-mode (&optional arg)
 252   "Toggle Outline minor mode.
 253 With arg, turn Outline minor mode on if arg is positive, off otherwise.
 254 See the command `outline-mode' for more information on this mode."
 255   (interactive "P")
 256   (setq outline-minor-mode
 257         (if (null arg) (not outline-minor-mode)
 258           (> (prefix-numeric-value arg) 0)))
 259   (if outline-minor-mode
 260       (progn
 261         (setq selective-display t)
 262         (run-hooks 'outline-minor-mode-hook))
 263     (setq selective-display nil))
 264   ;; When turning off outline mode, get rid of any ^M's.
 265   (or outline-minor-mode
 266       (outline-flag-region (point-min) (point-max) ?\n))
 267   (force-mode-line-update))
 268 \f
 269 (defvar outline-level 'outline-level
 270   "Function of no args to compute a header's nesting level in an outline.
 271 It can assume point is at the beginning of a header line.")
 272
 273 ;; This used to count columns rather than characters, but that made ^L
 274 ;; appear to be at level 2 instead of 1.  Columns would be better for
 275 ;; tab handling, but the default regexp doesn't use tabs, and anyone
 276 ;; who changes the regexp can also redefine the outline-level variable
 277 ;; as appropriate.
 278 (defun outline-level ()
 279   "Return the depth to which a statement is nested in the outline.
 280 Point must be at the beginning of a header line.  This is actually
 281 the number of characters that `outline-regexp' matches."
 282   (save-excursion
 283     (looking-at outline-regexp)
 284     (- (match-end 0) (match-beginning 0))))
 285
 286 (defun outline-next-preface ()
 287   "Skip forward to just before the next heading line.
 288 If there's no following heading line, stop before the newline
 289 at the end of the buffer."
 290   (if (re-search-forward (concat "[\n\^M]\\(" outline-regexp "\\)")
 291                          nil 'move)
 292       (goto-char (match-beginning 0)))
 293   (if (memq (preceding-char) '(?\n ?\^M))
 294       (forward-char -1)))
 295
 296 (defun outline-next-heading ()
 297   "Move to the next (possibly invisible) heading line."
 298   (interactive)
 299   (if (re-search-forward (concat "[\n\^M]\\(" outline-regexp "\\)")
 300                          nil 'move)
 301       (goto-char (1+ (match-beginning 0)))))
 302
 303 (defun outline-back-to-heading ()
 304   "Move to previous heading line, or beg of this line if it's a heading.
 305 Only visible heading lines are considered."
 306   (beginning-of-line)
 307   (or (outline-on-heading-p)
 308       (re-search-backward (concat "^\\(" outline-regexp "\\)") nil t)
 309       (error "before first heading")))
 310
 311 (defun outline-on-heading-p ()
 312   "Return t if point is on a (visible) heading line."
 313   (save-excursion
 314     (beginning-of-line)
 315     (and (bolp)
 316          (looking-at outline-regexp))))
 317
 318 (defun outline-end-of-heading ()
 319   (if (re-search-forward outline-heading-end-regexp nil 'move)
 320       (forward-char -1)))
 321
 322 (defun outline-next-visible-heading (arg)
 323   "Move to the next visible heading line.
 324 With argument, repeats or can move backward if negative.
 325 A heading line is one that starts with a `*' (or that
 326 `outline-regexp' matches)."
 327   (interactive "p")
 328   (if (< arg 0)
 329       (beginning-of-line)
 330     (end-of-line))
 331   (or (re-search-forward (concat "^\\(" outline-regexp "\\)") nil t arg)
 332       (error ""))
 333   (beginning-of-line))
 334
 335 (defun outline-previous-visible-heading (arg)
 336   "Move to the previous heading line.
 337 With argument, repeats or can move forward if negative.
 338 A heading line is one that starts with a `*' (or that
 339 `outline-regexp' matches)."
 340   (interactive "p")
 341   (outline-next-visible-heading (- arg)))
 342
 343 (defun outline-flag-region (from to flag)
 344   "Hides or shows lines from FROM to TO, according to FLAG.
 345 If FLAG is `\\n' (newline character) then text is shown,
 346 while if FLAG is `\\^M' (control-M) the text is hidden."
 347   (let (buffer-read-only)
 348     (subst-char-in-region from to
 349                           (if (= flag ?\n) ?\^M ?\n)
 350                           flag t)))
 351 \f
 352 (defun hide-entry ()
 353   "Hide the body directly following this heading."
 354   (interactive)
 355   (outline-back-to-heading)
 356   (outline-end-of-heading)
 357   (save-excursion
 358    (outline-flag-region (point) (progn (outline-next-preface) (point)) ?\^M)))
 359
 360 (defun show-entry ()
 361   "Show the body directly following this heading."
 362   (interactive)
 363   (save-excursion
 364    (outline-flag-region (point) (progn (outline-next-preface) (point)) ?\n)))
 365
 366 (defun hide-body ()
 367   "Hide all of buffer except headings."
 368   (interactive)
 369   (hide-region-body (point-min) (point-max)))
 370
 371 (defun hide-region-body (start end)
 372   "Hide all body lines in the region, but not headings."
 373   (save-excursion
 374     (save-restriction
 375       (narrow-to-region start end)
 376       (goto-char (point-min))
 377       (if (outline-on-heading-p)
 378           (outline-end-of-heading))
 379       (while (not (eobp))
 380         (outline-flag-region (point)
 381                              (progn (outline-next-preface) (point)) ?\^M)
 382         (if (not (eobp))
 383             (progn
 384               (forward-char
 385                (if (looking-at "[\n\^M][\n\^M]")
 386                    2 1))
 387               (outline-end-of-heading)))))))
 388
 389 (defun show-all ()
 390   "Show all of the text in the buffer."
 391   (interactive)
 392   (outline-flag-region (point-min) (point-max) ?\n))
 393
 394 (defun hide-subtree ()
 395   "Hide everything after this heading at deeper levels."
 396   (interactive)
 397   (outline-flag-subtree ?\^M))
 398
 399 (defun hide-leaves ()
 400   "Hide all body after this heading at deeper levels."
 401   (interactive)
 402   (outline-back-to-heading)
 403   (outline-end-of-heading)
 404   (hide-region-body (point) (progn (outline-end-of-subtree) (point))))
 405
 406 (defun show-subtree ()
 407   "Show everything after this heading at deeper levels."
 408   (interactive)
 409   (outline-flag-subtree ?\n))
 410
 411 (defun hide-sublevels (levels)
 412   "Hide everything but the top LEVELS levels of headers, in whole buffer."
 413   (interactive "p")
 414   (if (< levels 1)
 415       (error "Must keep at least one level of headers"))
 416   (setq levels (1- levels))
 417   (save-excursion
 418     (goto-char (point-min))
 419     ;; Keep advancing to the next top-level heading.
 420     (while (or (and (bobp) (outline-on-heading-p))
 421                (outline-next-heading))
 422       (let ((end (save-excursion (outline-end-of-subtree) (point))))
 423         ;; Hide everything under that.
 424         (outline-flag-region (point) end ?\^M)
 425         ;; Show the first LEVELS levels under that.
 426         (if (> levels 0)
 427             (show-children levels))
 428         ;; Move to the next, since we already found it.
 429         (goto-char end)))))
 430
 431 (defun hide-other ()
 432   "Hide everything except for the current body and the parent headings."
 433   (interactive)
 434   (hide-sublevels 1)
 435   (let ((last (point))
 436         (pos (point)))
 437     (while (save-excursion
 438              (and (re-search-backward "[\n\r]" nil t)
 439                   (eq (following-char) ?\r)))
 440       (save-excursion
 441         (beginning-of-line)
 442         (if (eq last (point))
 443             (progn
 444               (outline-next-heading)
 445               (outline-flag-region last (point) ?\n))
 446           (show-children)
 447           (setq last (point)))))))
 448
 449 (defun outline-flag-subtree (flag)
 450   (save-excursion
 451     (outline-back-to-heading)
 452     (outline-end-of-heading)
 453     (outline-flag-region (point)
 454                           (progn (outline-end-of-subtree) (point))
 455                           flag)))
 456
 457 (defun outline-end-of-subtree ()
 458   (outline-back-to-heading)
 459   (let ((opoint (point))
 460         (first t)
 461         (level (funcall outline-level)))
 462     (while (and (not (eobp))
 463                 (or first (> (funcall outline-level) level)))
 464       (setq first nil)
 465       (outline-next-heading))
 466     (if (memq (preceding-char) '(?\n ?\^M))
 467         (progn
 468           ;; Go to end of line before heading
 469           (forward-char -1)
 470           (if (memq (preceding-char) '(?\n ?\^M))
 471               ;; leave blank line before heading
 472               (forward-char -1))))))
 473 \f
 474 (defun show-branches ()
 475   "Show all subheadings of this heading, but not their bodies."
 476   (interactive)
 477   (show-children 1000))
 478
 479 (defun show-children (&optional level)
 480   "Show all direct subheadings of this heading.
 481 Prefix arg LEVEL is how many levels below the current level should be shown.
 482 Default is enough to cause the following heading to appear."
 483   (interactive "P")
 484   (setq level
 485         (if level (prefix-numeric-value level)
 486           (save-excursion
 487             (outline-back-to-heading)
 488             (let ((start-level (funcall outline-level)))
 489               (outline-next-heading)
 490               (if (eobp)
 491                   1
 492                 (max 1 (- (funcall outline-level) start-level)))))))
 493   (save-excursion
 494     (save-restriction
 495       (outline-back-to-heading)
 496       (setq level (+ level (funcall outline-level)))
 497       (narrow-to-region (point)
 498                         (progn (outline-end-of-subtree)
 499                                (if (eobp) (point-max) (1+ (point)))))
 500       (goto-char (point-min))
 501       (while (and (not (eobp))
 502                   (progn
 503                     (outline-next-heading)
 504                     (not (eobp))))
 505         (if (<= (funcall outline-level) level)
 506             (save-excursion
 507               (outline-flag-region (save-excursion
 508                                      (forward-char -1)
 509                                      (if (memq (preceding-char) '(?\n ?\^M))
 510                                          (forward-char -1))
 511                                      (point))
 512                                    (progn (outline-end-of-heading) (point))
 513                                    ?\n)))))))
 514 \f
 515 (defun outline-up-heading (arg)
 516   "Move to the heading line of which the present line is a subheading.
 517 With argument, move up ARG levels."
 518   (interactive "p")
 519   (outline-back-to-heading)
 520   (if (eq (funcall outline-level) 1)
 521       (error ""))
 522   (while (and (> (funcall outline-level) 1)
 523               (> arg 0)
 524               (not (bobp)))
 525     (let ((present-level (funcall outline-level)))
 526       (while (not (< (funcall outline-level) present-level))
 527         (outline-previous-visible-heading 1))
 528       (setq arg (- arg 1)))))
 529
 530 (defun outline-forward-same-level (arg)
 531   "Move forward to the ARG'th subheading at same level as this one.
 532 Stop at the first and last subheadings of a superior heading."
 533   (interactive "p")
 534   (outline-back-to-heading)
 535   (while (> arg 0)
 536     (let ((point-to-move-to (save-excursion
 537                               (outline-get-next-sibling))))
 538       (if point-to-move-to
 539           (progn
 540             (goto-char point-to-move-to)
 541             (setq arg (1- arg)))
 542         (progn
 543           (setq arg 0)
 544           (error ""))))))
 545
 546 (defun outline-get-next-sibling ()
 547   "Move to next heading of the same level, and return point or nil if none."
 548   (let ((level (funcall outline-level)))
 549     (outline-next-visible-heading 1)
 550     (while (and (> (funcall outline-level) level)
 551                 (not (eobp)))
 552       (outline-next-visible-heading 1))
 553     (if (< (funcall outline-level) level)
 554         nil
 555       (point))))
 556
 557 (defun outline-backward-same-level (arg)
 558   "Move backward to the ARG'th subheading at same level as this one.
 559 Stop at the first and last subheadings of a superior heading."
 560   (interactive "p")
 561   (outline-back-to-heading)
 562   (while (> arg 0)
 563     (let ((point-to-move-to (save-excursion
 564                               (outline-get-last-sibling))))
 565       (if point-to-move-to
 566           (progn
 567             (goto-char point-to-move-to)
 568             (setq arg (1- arg)))
 569         (progn
 570           (setq arg 0)
 571           (error ""))))))
 572
 573 (defun outline-get-last-sibling ()
 574   "Move to next heading of the same level, and return point or nil if none."
 575   (let ((level (funcall outline-level)))
 576     (outline-previous-visible-heading 1)
 577     (while (and (> (funcall outline-level) level)
 578                 (not (bobp)))
 579       (outline-previous-visible-heading 1))
 580     (if (< (funcall outline-level) level)
 581         nil
 582         (point))))
 583
 584 (provide 'outline)
 585
 586 ;; arch-tag: 14ed00e1-bd40-4db8-86e5-3b82ce326e45
 587 ;;; ooutline.el ends here