From: Michael Campbell <michael_s_campbell@...>
Date: 2004-03-18T23:28:40+09:00
Subject: Re: Thinking about a date-matching algorithm...

Hal Fulton wrote:
> I did a little swapping of ideas with dblack on this. Now I'm
> opening discussion to anyone interested.
> 
> I'm writing a little to-do manager (chiefly for my own use).
> 
> I want to allow recurring tasks. Some of these will be simple, like
> "Every Monday." Others will be more complex, like "Every 2nd and
4th
> Friday." Some might not even be based on weeks or months at all,
but
> might be like: "Every ten days, no matter what."
> 
> There'd also be an option to give advance warning (N days) on each
> event.
> 
> So the question becomes: Given a date (typically "today") and a
list
> of recurring tasks, how do I determine which ones need to be
displayed?

Check the archives, Hal.  I'm almost positive it was this group I 
read from Dossy a ways back about a TCL or Python app which did 
exactly that.

It used a full-on BNF grammar, if I recall correctly.

__________________________________
Do you Yahoo!?
Yahoo! Mail - More reliable, more storage, less spam
http://mail.yahoo.com