From mboxrd@z Thu Jan  1 00:00:00 1970
From: Martin Pohlack <mp26@os.inf.tu-dresden.de>
Subject: Re: Date-tree navigation question
Date: Fri, 09 Mar 2012 21:35:24 +0100
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References: <4F54DB9D.4060904@alum.mit.edu>
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To: rjhorn@alum.mit.edu
Cc: Org-mode list <emacs-orgmode@gnu.org>

Hi Robert,

Not sure what you want to do after opening but I have some code that
extracts a time range out of a date tree.  Maybe you can reuse the
searching parts ...

Cheers,
Martin

----------------------------------------------------------------------
(defun mp26/org-find-headline-prefix-in-buffer (heading &optional buffer pos-only)
  "Find node with heading-prefix HEADING in BUFFER.
Return a marker to the heading if it was found, or nil if not.
If POS-ONLY is set, return just the position instead of a marker.

The heading prefix must match as prefix of the full headline.  It
may have a TODO keyword, a priority cookie and tags in the
standard locations."
  (with-current-buffer (or buffer (current-buffer))
    (save-excursion
      (save-restriction
	(widen)
	(goto-char (point-min))
	(let (case-fold-search)
	  (if (re-search-forward
	       (format org-complex-heading-regexp-format
		       (concat (regexp-quote heading) ".*")) nil t)
	      (if pos-only
		  (match-beginning 0)
		(move-marker (make-marker) (match-beginning 0)))))))))

(defun mp26/org-week-from-journal ()
  "Insert a copy of the current week from the journal."
  (interactive)
  (insert
   (mapconcat
    'identity
    (with-current-buffer "Journal.org<Daten>"
      (loop for days in '(-6 -5 -4 -3 -2 -1 0)
            collect
            (let* ((date (calendar-current-date days))
                   (date-string
                    (format "%d-%02d-%02d"
                            (nth 2 date) (nth 0 date) (nth 1 date))))
              (setq pos (mp26/org-find-headline-prefix-in-buffer
                         date-string nil t))
              (when pos
                (goto-char pos)
                (org-copy-subtree)
                (car kill-ring)))))
   "")))
----------------------------------------------------------------------