Felipe Contreras <felipe.contreras@gmail.com> writes:

>
> That should work to update existing tags, but how are we going to
> detect if a message has disappeared? Or is that not a thing?

Indeed the same thought had occurred to me not long ago. I remembered
(belately) that I'd been through some similar thought process with nmbug.
Messages can and do disappear. So for I guess that optimization not OK,
at least not without some complications.

> Does "lastmod:0.." get all the revisions? If so, it might make sense
> to set $lastmod to 0 initially.
>
> Then we could unconditionally do:
>
>     $db.query('lastmod:%d..' % $lastmod, sort: Notmuch::SORT_UNSORTED)

That would work, but as you point out, we'd need to deal with deletions
somehow. It occurs to me that wr_export also needs to be able to handle
disappearing message-ids. I suppose like notmuch-restore it can just
complain and skip any missing ones. It's tempting to try to do some kind
of lazy cleanup at that point, but I don't really see how that fits with
the remote-helper protocol.

d
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