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- ;;; outline.el --- outline mode commands for Emacs
-
- ;; Copyright (C) 1986 Free Software Foundation, Inc.
-
- ;; Maintainer: FSF
-
- ;; 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 2, 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.
-
- ;;; Commentary:
-
- ;; This package is a major mode for editing outline-format documents.
- ;; An outline can be `abstracted' to show headers at any given level,
- ;; with all stuff below hidden. See the Emacs manual for details.
-
- ;;; Code:
-
- ;; 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.
- Any line whose beginning matches this regexp is considered to start a heading.
- The recommended way to set this is with a Local Variables: list
- in the file it applies to. See also outline-heading-end-regexp.")
-
- (defvar outline-heading-end-regexp "[\n\^M]"
- "*Regular expression to match the end of a heading line.
- You can assume that point is at the beginning of a heading when this
- regexp is searched for. The heading ends at the end of the match.
- 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 (nconc (make-sparse-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)
-
- (define-key outline-mode-map [menu-bar hide]
- (cons "Hide" (make-sparse-keymap "Hide")))
-
- (define-key outline-mode-map [menu-bar hide hide-subtree]
- '("Hide Subtree" . outline-hide-subtree))
- (define-key outline-mode-map [menu-bar hide hide-entry]
- '("Hide Entry" . outline-hide-entry))
- (define-key outline-mode-map [menu-bar hide hide-body]
- '("Hide Body" . outline-hide-body))
- (define-key outline-mode-map [menu-bar hide hide-leaves]
- '("Hide Leaves" . outline-hide-leaves))
-
- (define-key outline-mode-map [menu-bar show]
- (cons "Show" (make-sparse-keymap "Show")))
-
- (define-key outline-mode-map [menu-bar show show-subtree]
- '("Show Subtree" . outline-show-subtree))
- (define-key outline-mode-map [menu-bar show show-children]
- '("Show Children" . outline-show-children))
- (define-key outline-mode-map [menu-bar show show-branches]
- '("Show Branches" . outline-show-branches))
- (define-key outline-mode-map [menu-bar show show-entry]
- '("Show Entry" . outline-show-entry))
- (define-key outline-mode-map [menu-bar show show-all]
- '("Show All" . outline-show-all))
-
- (define-key outline-mode-map [menu-bar headings]
- (cons "Headings" (make-sparse-keymap "Headings")))
-
- (define-key outline-mode-map [menu-bar headings outline-backward-same-level]
- '("Previous Same Level" . outline-backward-same-level))
- (define-key outline-mode-map [menu-bar headings outline-forward-same-level]
- '("Next Same Level" . outline-forward-same-level))
- (define-key outline-mode-map [menu-bar headings outline-previous-visible-heading]
- '("Previous" . outline-previous-visible-heading))
- (define-key outline-mode-map [menu-bar headings outline-next-visible-heading]
- '("Next" . outline-next-visible-heading))
- (define-key outline-mode-map [menu-bar headings outline-up-heading]
- '("Up" . outline-up-heading)))
-
- (defvar outline-minor-mode nil
- "Non-nil if using Outline mode as a minor mode of some other mode.")
- (make-variable-buffer-local 'outline-minor-mode)
- (put 'outline-minor-mode 'permanent-local t)
- (setq minor-mode-alist (append minor-mode-alist
- (list '(outline-minor-mode " Outl"))))
-
- ;;;###autoload
- (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:\\<outline-mode-map>
- \\[outline-next-visible-heading] outline-next-visible-heading move by visible headings
- \\[outline-previous-visible-heading] outline-previous-visible-heading
- \\[outline-forward-same-level] outline-forward-same-level similar but skip subheadings
- \\[outline-backward-same-level] outline-backward-same-level
- \\[outline-up-heading] outline-up-heading move from subheading to heading
-
- M-x hide-body make all text invisible (not headings).
- M-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.
- \\[hide-subtree] hide-subtree make body and subheadings invisible.
- \\[show-subtree] show-subtree make body and subheadings visible.
- \\[show-children] 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 "\\)"))
- ;; Inhibit auto-filling of header lines.
- (make-local-variable 'auto-fill-inhibit-regexp)
- (setq auto-fill-inhibit-regexp outline-regexp)
- (make-local-variable 'paragraph-separate)
- (setq paragraph-separate (concat paragraph-separate "\\|^\\("
- outline-regexp "\\)"))
- (run-hooks 'text-mode-hook 'outline-mode-hook))
-
- (defvar outline-minor-mode-map nil)
- (if outline-minor-mode-map
- nil
- (setq outline-minor-mode-map (make-sparse-keymap))
- (define-key outline-minor-mode-map [menu-bar]
- (lookup-key outline-mode-map [menu-bar]))
- (define-key outline-minor-mode-map "\C-c"
- (lookup-key outline-mode-map "\C-c")))
-
- (or (assq 'outline-minor-mode minor-mode-map-alist)
- (setq minor-mode-map-alist
- (cons (cons 'outline-minor-mode outline-minor-mode-map)
- minor-mode-map-alist)))
-
- ;;;###autoload
- (defun outline-minor-mode (&optional arg)
- "Toggle Outline minor mode.
- With arg, turn Outline minor mode on if arg is positive, off otherwise.
- See the command `outline-mode' for more information on this mode."
- (interactive "P")
- (setq outline-minor-mode
- (if (null arg) (not outline-minor-mode)
- (> (prefix-numeric-value arg) 0)))
- (if outline-minor-mode
- (progn
- (setq selective-display t)
- (run-hooks 'outline-minor-mode-hook))
- (setq selective-display nil)))
-
- (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 column number of the end of what `outline-regexp matches'."
- (save-excursion
- (looking-at outline-regexp)
- (save-excursion (goto-char (match-end 0)) (current-column))))
-
- (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 the 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-end-of-heading ()
- (if (re-search-forward outline-heading-end-regexp nil 'move)
- (forward-char -1)))
-
- (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 (buffer-read-only)
- (subst-char-in-region from to
- (if (= flag ?\n) ?\^M ?\n)
- flag t)))
-
- (defun hide-entry ()
- "Hide the body directly following this heading."
- (interactive)
- (outline-back-to-heading)
- (outline-end-of-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))
- (if (outline-on-heading-p)
- (outline-end-of-heading))
- (while (not (eobp))
- (outline-flag-region (point)
- (progn (outline-next-preface) (point)) ?\^M)
- (if (not (eobp))
- (progn
- (forward-char
- (if (looking-at "[\n\^M][\n\^M]")
- 2 1))
- (outline-end-of-heading)))))))
-
- (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)
- (outline-end-of-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-end-of-heading)
- (outline-flag-region (point)
- (progn (outline-end-of-subtree) (point))
- flag)))
-
- (defun outline-end-of-subtree ()
- (outline-back-to-heading)
- (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.
- Prefix arg LEVEL is how many levels below the current level should be shown.
- Default is enough to cause the following heading to appear."
- (interactive "P")
- (setq level
- (if level (prefix-numeric-value level)
- (save-excursion
- (beginning-of-line)
- (let ((start-level (outline-level)))
- (outline-next-heading)
- (max 1 (- (outline-level) start-level))))))
- (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
- (outline-flag-region (save-excursion
- (forward-char -1)
- (if (memq (preceding-char) '(?\n ?\^M))
- (forward-char -1))
- (point))
- (progn (outline-end-of-heading) (point))
- ?\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))))
-
- (provide 'outline)
-
- ;;; outline.el ends here
-