From mboxrd@z Thu Jan  1 00:00:00 1970
From: chrisw@rice.edu (Christopher Warrington)
Date: Mon, 03 Mar 2008 01:07:55 -0600
Subject: [sup-talk] Maildir source with one message
Message-ID: <1204528063-sup-7345@chris-tablet>

In playing with offline IMAP and Maildir sources (much faster than a native IMAP source and it can be used offline!), I noticed an odd bug.

If there is only one message in a Maildir source, neither sup not
sup-sync can see this message. Adding another message makes both
visible messages visible.

--- here begins speculation ---

I *THINK* that this has to do with the definitions Source.start_offset
and Source.end_offset. As I understand it, they should define a range
of message ids [start_offset, end_offset).

Now, when start_offset = end_offset--as is the case when there is only
one message, bad things happen. As I understand the math:
(a,a) = {}
[a,a) = {} *our case
(a,a] = {}
[a,a] = {a.

Changing maildir.rb:126 from:
    @ids.last
to
    @ids.last + 1
appears to have fixed the problem without ill-effect.

Simple inspection of imap.rp leads be to believe that it will have the
same problem.

A mbox source will have the same problem iff the mbox is empty.

--- here ends speculation ---

-- 
Christopher Warrington <chrisw at rice.edu>