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- ;; Outline mode commands for Emacs
- ;; Copyright (C) 1986 Free Software Foundation, Inc.
-
- ;; This file is part of GNU Emacs.
-
- ;; GNU Emacs is free software; you can redistribute it and/or modify
- ;; it under the terms of the GNU General Public License as published by
- ;; the Free Software Foundation; either version 1, or (at your option)
- ;; any later version.
-
- ;; GNU Emacs is distributed in the hope that it will be useful,
- ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
- ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- ;; GNU General Public License for more details.
-
- ;; You should have received a copy of the GNU General Public License
- ;; along with GNU Emacs; see the file COPYING. If not, write to
- ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- ;; Jan '86, Some new features added by Peter Desnoyers and rewritten by RMS.
-
- (defvar outline-regexp "[*\^l]+"
- "*Regular expression to match the beginning of a heading line.
- Any line whose beginning matches this regexp is considered a heading.
- The recommended way to set this is with a Local Variables: list
- in the file it applies to.")
-
- (defvar outline-mode-map nil "")
-
- (if outline-mode-map
- nil
- (setq outline-mode-map (copy-keymap text-mode-map))
- (define-key outline-mode-map "\C-c\C-n" 'outline-next-visible-heading)
- (define-key outline-mode-map "\C-c\C-p" 'outline-previous-visible-heading)
- (define-key outline-mode-map "\C-c\C-i" 'show-children)
- (define-key outline-mode-map "\C-c\C-s" 'show-subtree)
- (define-key outline-mode-map "\C-c\C-h" 'hide-subtree)
- (define-key outline-mode-map "\C-c\C-u" 'outline-up-heading)
- (define-key outline-mode-map "\C-c\C-f" 'outline-forward-same-level)
- (define-key outline-mode-map "\C-c\C-b" 'outline-backward-same-level))
-
- (defun outline-mode ()
- "Set major mode for editing outlines with selective display.
- Headings are lines which start with asterisks: one for major headings,
- two for subheadings, etc. Lines not starting with asterisks are body lines.
-
- Body text or subheadings under a heading can be made temporarily
- invisible, or visible again. Invisible lines are attached to the end
- of the heading, so they move with it, if the line is killed and yanked
- back. A heading with text hidden under it is marked with an ellipsis (...).
-
- Commands:
- C-c C-n outline-next-visible-heading move by visible headings
- C-c C-p outline-previous-visible-heading
- C-c C-f outline-forward-same-level similar but skip subheadings
- C-c C-b outline-backward-same-level
- C-c C-u outline-up-heading move from subheading to heading
-
- Meta-x hide-body make all text invisible (not headings).
- Meta-x show-all make everything in buffer visible.
-
- The remaining commands are used when point is on a heading line.
- They apply to some of the body or subheadings of that heading.
- C-c C-h hide-subtree make body and subheadings invisible.
- C-c C-s show-subtree make body and subheadings visible.
- C-c C-i show-children make direct subheadings visible.
- No effect on body, or subheadings 2 or more levels down.
- With arg N, affects subheadings N levels down.
- M-x hide-entry make immediately following body invisible.
- M-x show-entry make it visible.
- M-x hide-leaves make body under heading and under its subheadings invisible.
- The subheadings remain visible.
- M-x show-branches make all subheadings at all levels visible.
-
- The variable outline-regexp can be changed to control what is a heading.
- A line is a heading if outline-regexp matches something at the
- beginning of the line. The longer the match, the deeper the level.
-
- Turning on outline mode calls the value of text-mode-hook and then of
- outline-mode-hook, if they are non-nil."
- (interactive)
- (kill-all-local-variables)
- (setq selective-display t)
- (use-local-map outline-mode-map)
- (setq mode-name "Outline")
- (setq major-mode 'outline-mode)
- (define-abbrev-table 'text-mode-abbrev-table ())
- (setq local-abbrev-table text-mode-abbrev-table)
- (set-syntax-table text-mode-syntax-table)
- (make-local-variable 'paragraph-start)
- (setq paragraph-start (concat paragraph-start "\\|^\\("
- outline-regexp "\\)"))
- (make-local-variable 'paragraph-separate)
- (setq paragraph-separate (concat paragraph-separate "\\|^\\("
- outline-regexp "\\)"))
- (run-hooks 'text-mode-hook 'outline-mode-hook))
-
- (defun outline-level ()
- "Return the depth to which a statement is nested in the outline.
- Point must be at the beginning of a header line.
- This is actually the length of whatever outline-regexp matches."
- (save-excursion
- (looking-at outline-regexp)
- (- (match-end 0) (match-beginning 0))))
-
- (defun outline-next-preface ()
- "Skip forward to just before the next heading line."
- (if (re-search-forward (concat "[\n\^M]\\(" outline-regexp "\\)")
- nil 'move)
- (goto-char (match-beginning 0)))
- (if (memq (preceding-char) '(?\n ?\^M))
- (forward-char -1)))
-
- (defun outline-next-heading ()
- "Move to the next (possibly invisible) heading line."
- (interactive)
- (if (re-search-forward (concat "[\n\^M]\\(" outline-regexp "\\)")
- nil 'move)
- (goto-char (1+ (match-beginning 0)))))
-
- (defun outline-back-to-heading ()
- "Move to previous (possibly invisible) heading line,
- or to beginning of this line if it is a heading line."
- (beginning-of-line)
- (or (outline-on-heading-p)
- (re-search-backward (concat "^\\(" outline-regexp "\\)") nil 'move)))
-
- (defun outline-on-heading-p ()
- "Return T if point is on a header line."
- (save-excursion
- (beginning-of-line)
- (and (eq (preceding-char) ?\n)
- (looking-at outline-regexp))))
-
- (defun outline-next-visible-heading (arg)
- "Move to the next visible heading line.
- With argument, repeats or can move backward if negative.
- A heading line is one that starts with a `*' (or that outline-regexp matches)."
- (interactive "p")
- (if (< arg 0)
- (beginning-of-line)
- (end-of-line))
- (re-search-forward (concat "^\\(" outline-regexp "\\)") nil nil arg)
- (beginning-of-line))
-
- (defun outline-previous-visible-heading (arg)
- "Move to the previous heading line.
- With argument, repeats or can move forward if negative.
- A heading line is one that starts with a `*' (or that outline-regexp matches)."
- (interactive "p")
- (outline-next-visible-heading (- arg)))
-
- (defun outline-flag-region (from to flag)
- "Hides or shows lines from FROM to TO, according to FLAG.
- If FLAG is `\\n' (newline character) then text is shown,
- while if FLAG is `\\^M' (control-M) the text is hidden."
- (let ((modp (buffer-modified-p)))
- (unwind-protect
- (subst-char-in-region from to
- (if (= flag ?\n) ?\^M ?\n)
- flag t)
- (set-buffer-modified-p modp))))
-
- (defun hide-entry ()
- "Hide the body directly following this heading."
- (interactive)
- (outline-back-to-heading)
- (save-excursion
- (outline-flag-region (point) (progn (outline-next-preface) (point)) ?\^M)))
-
- (defun show-entry ()
- "Show the body directly following this heading."
- (interactive)
- (save-excursion
- (outline-flag-region (point) (progn (outline-next-preface) (point)) ?\n)))
-
- (defun hide-body ()
- "Hide all of buffer except headings."
- (interactive)
- (hide-region-body (point-min) (point-max)))
-
- (defun hide-region-body (start end)
- "Hide all body lines in the region, but not headings."
- (save-excursion
- (save-restriction
- (narrow-to-region start end)
- (goto-char (point-min))
- (while (not (eobp))
- (outline-flag-region (point) (progn (outline-next-preface) (point)) ?\^M)
- (if (not (eobp))
- (forward-char
- (if (looking-at "[\n\^M][\n\^M]")
- 2 1)))))))
-
- (defun show-all ()
- "Show all of the text in the buffer."
- (interactive)
- (outline-flag-region (point-min) (point-max) ?\n))
-
- (defun hide-subtree ()
- "Hide everything after this heading at deeper levels."
- (interactive)
- (outline-flag-subtree ?\^M))
-
- (defun hide-leaves ()
- "Hide all body after this heading at deeper levels."
- (interactive)
- (outline-back-to-heading)
- (hide-region-body (point) (progn (outline-end-of-subtree) (point))))
-
- (defun show-subtree ()
- "Show everything after this heading at deeper levels."
- (interactive)
- (outline-flag-subtree ?\n))
-
- (defun outline-flag-subtree (flag)
- (save-excursion
- (outline-back-to-heading)
- (outline-flag-region (point)
- (progn (outline-end-of-subtree) (point))
- flag)))
-
- (defun outline-end-of-subtree ()
- (beginning-of-line)
- (let ((opoint (point))
- (first t)
- (level (outline-level)))
- (while (and (not (eobp))
- (or first (> (outline-level) level)))
- (setq first nil)
- (outline-next-heading))
- (forward-char -1)
- (if (memq (preceding-char) '(?\n ?\^M))
- (forward-char -1))))
-
- (defun show-branches ()
- "Show all subheadings of this heading, but not their bodies."
- (interactive)
- (show-children 1000))
-
- (defun show-children (&optional level)
- "Show all direct subheadings of this heading. Optional LEVEL specifies
- how many levels below the current level should be shown."
- (interactive "p")
- (or level (setq level 1))
- (save-excursion
- (save-restriction
- (beginning-of-line)
- (setq level (+ level (outline-level)))
- (narrow-to-region (point)
- (progn (outline-end-of-subtree) (1+ (point))))
- (goto-char (point-min))
- (while (and (not (eobp))
- (progn
- (outline-next-heading)
- (not (eobp))))
- (if (<= (outline-level) level)
- (save-excursion
- (let ((end (1+ (point))))
- (forward-char -1)
- (if (memq (preceding-char) '(?\n ?\^M))
- (forward-char -1))
- (outline-flag-region (point) end ?\n))))))))
-
- (defun outline-up-heading (arg)
- "Move to the heading line of which the present line is a subheading.
- With argument, move up ARG levels."
- (interactive "p")
- (outline-back-to-heading)
- (if (eq (outline-level) 1)
- (error ""))
- (while (and (> (outline-level) 1)
- (> arg 0)
- (not (bobp)))
- (let ((present-level (outline-level)))
- (while (not (< (outline-level) present-level))
- (outline-previous-visible-heading 1))
- (setq arg (- arg 1)))))
-
- (defun outline-forward-same-level (arg)
- "Move forward to the ARG'th subheading from here of the same level as the
- present one. It stops at the first and last subheadings of a superior heading."
- (interactive "p")
- (outline-back-to-heading)
- (while (> arg 0)
- (let ((point-to-move-to (save-excursion
- (outline-get-next-sibling))))
- (if point-to-move-to
- (progn
- (goto-char point-to-move-to)
- (setq arg (1- arg)))
- (progn
- (setq arg 0)
- (error ""))))))
-
- (defun outline-get-next-sibling ()
- "Position the point at the next heading of the same level,
- and return that position or nil if it cannot be found."
- (let ((level (outline-level)))
- (outline-next-visible-heading 1)
- (while (and (> (outline-level) level)
- (not (eobp)))
- (outline-next-visible-heading 1))
- (if (< (outline-level) level)
- nil
- (point))))
-
- (defun outline-backward-same-level (arg)
- "Move backward to the ARG'th subheading from here of the same level as the
- present one. It stops at the first and last subheadings of a superior heading."
- (interactive "p")
- (outline-back-to-heading)
- (while (> arg 0)
- (let ((point-to-move-to (save-excursion
- (outline-get-last-sibling))))
- (if point-to-move-to
- (progn
- (goto-char point-to-move-to)
- (setq arg (1- arg)))
- (progn
- (setq arg 0)
- (error ""))))))
-
- (defun outline-get-last-sibling ()
- "Position the point at the previous heading of the same level,
- and return that position or nil if it cannot be found."
- (let ((level (outline-level)))
- (outline-previous-visible-heading 1)
- (while (and (> (outline-level) level)
- (not (bobp)))
- (outline-previous-visible-heading 1))
- (if (< (outline-level) level)
- nil
- (point))))
-
-