Austin Clements writes:
> Quoth Sam Halliday on Apr 27 at 12:09 pm:
>> But in any case, my RFE/question was this: how hard would it be to have
>> an optional mode of behaviour where tags are stored in the message
>> itself, so that syncing with an IMAP server (e.g. via offlineimap)
>> would make the tags available on all devices.
>
> FWIW, we've discussed being able to configure a bi-directional mapping
> between folders and notmuch tags, using hard links (or simply message
> copies) to map messages with multiple tags to multiple file system
> folders.  There's been some prototyping [1], though no serious code.
> If this did happen, you'd be able to sync Gmail labels with notmuch
> tags without any help from OfflineIMAP (OfflineIMAP could perform
> better and use less disk space if it knew how to set up hard links
> when talking to Gmail, but this would be entirely independent of
> notmuch).  You might also be able to work out cross-device sync, using
> IMAP folder synchronization as a channel for tag synchronization.

I am extremely interested in the progress of this. Please keep me
updated if anything moves in this area. Hard links are a secondary
concern (that could be independently scripted if memory is an issue, and
is only worth the effort if the label and tag syncing works).