org-mode/lisp/org-indent.el

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;;; org-indent.el --- Dynamic indentation for Org-mode
;; Copyright (C) 2009, 2010 Free Software Foundation, Inc.
;;
;; Author: Carsten Dominik <carsten at orgmode dot org>
;; Keywords: outlines, hypermedia, calendar, wp
;; Homepage: http://orgmode.org
;; Version: 7.01trans
;;
;; 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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;; Commentary:
;; This is an implementation of dynamic virtual indentation. It works
;; by adding text properties to a buffer to make sure lines are
;; indented according to outline structure.
;;; Code:
(require 'org-macs)
(require 'org-compat)
(require 'org)
(eval-when-compile
(require 'cl))
(defgroup org-indent nil
"Options concerning dynamic virtual outline indentation."
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:tag "Org Indent"
:group 'org)
(defconst org-indent-max 40
"Maximum indentation in characters.")
(defconst org-indent-max-levels 40
"Maximum indentation in characters.")
(defvar org-indent-strings nil
"Vector with all indentation strings.
It will be set in `org-indent-initialize'.")
(defvar org-indent-stars nil
"Vector with all indentation star strings.
It will be set in `org-indent-initialize'.")
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(defvar org-hide-leading-stars-before-indent-mode nil
"Used locally.")
(defcustom org-indent-boundary-char ?\ ; comment to protect space char
"The end of the virtual indentation strings, a single-character string.
The default is just a space, but if you wish, you can use \"|\" or so.
This can be useful on a terminal window - under a windowing system,
it may be prettier to customize the org-indent face."
:group 'org-indent
:set (lambda (var val)
(set var val)
(and org-indent-strings (org-indent-initialize)))
:type 'character)
(defcustom org-indent-mode-turns-off-org-adapt-indentation t
"Non-nil means setting the variable `org-indent-mode' will \
turn off indentation adaptation.
For details see the variable `org-adapt-indentation'."
:group 'org-indent
:type 'boolean)
(defcustom org-indent-mode-turns-on-hiding-stars t
"Non-nil means setting the variable `org-indent-mode' will \
turn on `org-hide-leading-stars'."
:group 'org-indent
:type 'boolean)
(defcustom org-indent-indentation-per-level 2
"Indentation per level in number of characters."
:group 'org-indent
:type 'integer)
(defcustom org-indent-fix-section-after-idle-time 0.2
"Seconds of idle time before fixing virtual indentation of section.
The hooking-in of virtual indentation is not yet perfect. Occasionally,
a change does not trigger to proper change of indentation. For this we
have a timer action that fixes indentation in the current section after
a short amount idle time. If we ever get the integration to work perfectly,
this variable can be set to nil to get rid of the timer."
:group 'org-indent
:type '(choice
(const "Do not install idle timer" nil)
(number :tag "Idle time")))
(defun org-indent-initialize ()
"Initialize the indentation strings and set the idle timer."
;; We use an idle timer to "repair" the current section, because the
;; redisplay seems to have some problems.
(unless org-indent-strings
(when org-indent-fix-section-after-idle-time
(run-with-idle-timer
org-indent-fix-section-after-idle-time
t 'org-indent-refresh-section)))
;; Initialize the indentation and star vectors
(setq org-indent-strings (make-vector (1+ org-indent-max) nil))
(setq org-indent-stars (make-vector (1+ org-indent-max) nil))
(aset org-indent-strings 0 nil)
(aset org-indent-stars 0 nil)
(loop for i from 1 to org-indent-max do
(aset org-indent-strings i
(org-add-props
(concat (make-string (1- i) ?\ )
(char-to-string org-indent-boundary-char))
nil 'face 'org-indent)))
(loop for i from 1 to org-indent-max-levels do
(aset org-indent-stars i
(org-add-props (make-string i ?*)
nil 'face 'org-hide))))
;;;###autoload
(define-minor-mode org-indent-mode
"When active, indent text according to outline structure.
Internally this works by adding `line-prefix' properties to all non-headlines.
These properties are updated locally in idle time.
FIXME: How to update when broken?"
nil " Ind" nil
(cond
((org-bound-and-true-p org-inhibit-startup)
(setq org-indent-mode nil))
((and org-indent-mode (featurep 'xemacs))
(message "org-indent-mode does not work in XEmacs - refusing to turn it on")
(setq org-indent-mode nil))
((and org-indent-mode
(not (org-version-check "23.1.50" "Org Indent mode" :predicate)))
(message "org-indent-mode can crash Emacs 23.1 - refusing to turn it on!")
(ding)
(sit-for 1)
(setq org-indent-mode nil))
(org-indent-mode
;; mode was turned on.
(org-set-local 'indent-tabs-mode nil)
(or org-indent-strings (org-indent-initialize))
(when org-indent-mode-turns-off-org-adapt-indentation
(org-set-local 'org-adapt-indentation nil))
(when org-indent-mode-turns-on-hiding-stars
(org-set-local 'org-hide-leading-stars-before-indent-mode
org-hide-leading-stars)
(org-set-local 'org-hide-leading-stars t))
(make-local-variable 'buffer-substring-filters)
(add-to-list 'buffer-substring-filters
'org-indent-remove-properties-from-string)
(org-add-hook 'org-after-demote-entry-hook
'org-indent-refresh-section nil 'local)
(org-add-hook 'org-after-promote-entry-hook
'org-indent-refresh-section nil 'local)
(org-add-hook 'org-font-lock-hook
'org-indent-refresh-to nil 'local)
(and font-lock-mode (org-restart-font-lock))
)
(t
;; mode was turned off (or we refused to turn it on)
(save-excursion
(save-restriction
(org-indent-remove-properties (point-min) (point-max))
(kill-local-variable 'org-adapt-indentation)
(when (boundp 'org-hide-leading-stars-before-indent-mode)
(org-set-local 'org-hide-leading-stars
org-hide-leading-stars-before-indent-mode))
(setq buffer-substring-filters
(delq 'org-indent-remove-properties-from-string
buffer-substring-filters))
(remove-hook 'org-after-promote-entry-hook
'org-indent-refresh-section 'local)
(remove-hook 'org-after-demote-entry-hook
'org-indent-refresh-section 'local)
(and font-lock-mode (org-restart-font-lock))
(redraw-display))))))
(defface org-indent
(org-compatible-face nil nil)
"Face for outline indentation.
The default is to make it look like whitespace. But you may find it
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useful to make it ever so slightly different."
:group 'org-faces)
(defun org-indent-indent-buffer ()
"Add indentation properties for the whole buffer."
(interactive)
(when org-indent-mode
(save-excursion
(save-restriction
(widen)
(org-indent-remove-properties (point-min) (point-max))
(org-indent-add-properties (point-min) (point-max))))))
(defun org-indent-remove-properties (beg end)
"Remove indentations between BEG and END."
(let ((inhibit-modification-hooks t))
(with-silent-modifications
(remove-text-properties beg end '(line-prefix nil wrap-prefix nil)))))
(defun org-indent-remove-properties-from-string (string)
"Remove indentations between BEG and END."
(remove-text-properties 0 (length string)
'(line-prefix nil wrap-prefix nil) string)
string)
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(defvar org-indent-outline-re (concat "^" org-outline-regexp)
"Outline heading regexp.")
(defun org-indent-add-properties (beg end)
"Add indentation properties between BEG and END.
Assumes that BEG is at the beginning of a line."
(when (or t org-indent-mode)
(let ((inhibit-modification-hooks t)
ov b e n level exit nstars)
(with-silent-modifications
(save-excursion
(goto-char beg)
(while (not exit)
(setq e end)
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(if (not (re-search-forward org-indent-outline-re nil t))
(setq e (point-max) exit t)
(setq e (match-beginning 0))
(if (>= e end) (setq exit t))
(setq level (- (match-end 0) (match-beginning 0) 1))
(setq nstars (- (* (1- level) org-indent-indentation-per-level)
(1- level)))
(add-text-properties
(point-at-bol) (point-at-eol)
(list 'line-prefix
(aref org-indent-stars nstars)
'wrap-prefix
(aref org-indent-strings
(* level org-indent-indentation-per-level)))))
(when (and b (> e b))
(add-text-properties
b e (list 'line-prefix (aref org-indent-strings n)
'wrap-prefix (aref org-indent-strings n))))
(setq b (1+ (point-at-eol))
n (* (or level 0) org-indent-indentation-per-level))))))))
(defun org-indent-refresh-section ()
"Refresh indentation properties in the current outline section.
Point is assumed to be at the beginning of a headline."
(interactive)
(when org-indent-mode
(let (beg end)
(save-excursion
(when (ignore-errors (org-back-to-heading))
(setq beg (point))
(setq end (or (save-excursion (or (outline-next-heading) (point)))))
(org-indent-remove-properties beg end)
(org-indent-add-properties beg end))))))
(defun org-indent-refresh-to (limit)
"Refresh indentation properties in the current outline section.
Point is assumed to be at the beginning of a headline."
(interactive)
(when org-indent-mode
(let ((beg (point)) (end limit))
(save-excursion
(and (ignore-errors (org-back-to-heading t))
(setq beg (point))))
(org-indent-remove-properties beg end)
(org-indent-add-properties beg end)))
(goto-char limit))
(defun org-indent-refresh-subtree ()
"Refresh indentation properties in the current outline subtree.
Point is assumed to be at the beginning of a headline."
(interactive)
(when org-indent-mode
(save-excursion
(let (beg end)
(setq beg (point))
(setq end (save-excursion (org-end-of-subtree t t)))
(org-indent-remove-properties beg end)
(org-indent-add-properties beg end)))))
(defun org-indent-refresh-buffer ()
"Refresh indentation properties in the current outline subtree.
Point is assumed to be at the beginning of a headline."
(interactive)
(when org-indent-mode
(org-indent-mode -1)
(org-indent-mode 1)))
(provide 'org-indent)
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;; arch-tag: b76736bc-9f4a-43cd-977c-ecfd6689846a
;;; org-indent.el ends here