Thanks for org-habit, it is a very nice feature!
When the last DONE date is earlier than `org-habit-preceding-days' the
graph can not be rendered due to error in org-habit-build-graph.
I have tracked down the problem (calling time-less-p on nil when
done-dates is empty) and the following patch is solving the issue for me
but I am not sure if this is how you intended it.
diff --git a/lisp/org-habit.el b/lisp/org-habit.el
index 6ba2097..26de1b0 100644
--- a/lisp/org-habit.el
+++ b/lisp/org-habit.el
@@ -278,10 +278,9 @@ Habits are assigned colors on the following basis:
(graph (make-string (1+ (- (time-to-days ending)
(time-to-days starting))) ?\ ))
(index 0))
- (if done-dates
- (while (time-less-p (car done-dates) starting)
- (setq last-done-date (car done-dates)
- done-dates (cdr done-dates))))
+ (while (and done-dates (time-less-p (car done-dates) starting))
+ (setq last-done-date (car done-dates)
+ done-dates (cdr done-dates)))
(while (time-less-p day ending)
(let* ((now-days (time-to-days day))
(in-the-past-p (< now-days current-days))
--
Mikael Fornius
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