TIP: set up org-agenda-files automagically

TIP: set up org-agenda-files automagically

[Richard KLINDA]

Here is a little code snippet for setting up the org-agenda-files
variable via elisp code, to only include files modified in the last X
days.

I use this, because I have ~500 org files and if I add all of them to
org-agenda-files then creating agenda buffers takes up just too much
time[1], and it is wasted effort anyway, because I only use a handful of
them on a day-to-day basis.

,----
| (defun rk-filter-new-files (max-age files)
|   "Returns only files that were modified MAX-AGE days ago."
|   (let ((current-day (time-to-days (current-time))))
|     (loop for file in files
|           for age = (time-to-days (nth 5 (file-attributes file)))
|           if (< (- current-day age)
|                 max-age)
|           collect file)))
| 
| (setq org-agenda-files (rk-filter-new-files
|                         380
|                         (append (directory-files "~/.xemacs/org/" t nil nil t)
|                                 (directory-files "~/.Wiki/" t nil nil t))))
`----


Footnotes: 
[1]  I don't want to add them manually 1-by-1 either.

-- 
Udv, Richard