From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Piotr Zielinski" <piotr.zielinski@gmail.com>
Subject: Re: Autocollapse of outline nodes
Date: Fri, 12 May 2006 03:26:48 +0200
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To: Carsten Dominik <carsten.dominik@gmail.com>
Cc: emacs-orgmode@gnu.org

Below is a version of autocollapse that works correctly even if
several windows show the same buffer.  It periodically collapses
outline nodes that are far from the current point position [1].

Piotr

[1] http://zerotau.blogspot.com/2006/04/autocollapse-mode-for-emacs.html

(defun local-fold-from-level (beg end level)
  (hide-region-body beg end)
  (goto-char beg)
  (unless (looking-at outline-regexp)
    (outline-next-visible-heading 1))
  (while (and (<=3D (point) end) (not (eobp)))
    (when (> (outline-level) level)
      (hide-subtree))
    (outline-next-visible-heading 1)))


(defun local-contains-point (beg end pointlist)
  (let ((result))
    (dolist (point pointlist result)
      (setq result (or result (and (>=3D point beg) (<=3D point end)))))))

(defun local-auto-fold ()
  (save-excursion
    (let ((pointlist (mapcar 'window-point
=09=09=09     (get-buffer-window-list (current-buffer) nil t))))
      (message "fold: %S: %S" (current-buffer) pointlist)
      (beginning-of-buffer)
      (unless (looking-at outline-regexp)
=09(outline-next-visible-heading 1))
      (while (not (eobp))
=09(let ((end (save-excursion (outline-end-of-subtree) (point))))
=09  (if (local-contains-point (point) end pointlist)
=09      (outline-next-visible-heading 1)
=09    (local-fold-from-level (point) end (outline-level))))))))
=09
(defun local-auto-fold-all ()
  (save-excursion
    (dolist (buffer (buffer-list))
      (set-buffer buffer)
      (when (eq major-mode 'org-mode)
=09(local-auto-fold)))))
=09=09
(run-with-idle-timer 60 t 'local-auto-fold-all)