On 17.06.23, Oswald Buddenhagen wrote:
On Fri, Jun 23, 2017 at 07:26:12AM -0400, Philip DeBoer wrote:
What would be the main challenges in adding support for custom flags?
Would they be difficult to fetch? Has anyone tried to add them?
well, it's work, and there are interoperability constraints.
there was a cross-project thread back in december, but i dropped the
ball.
OK, those aren't fundamental architecture issues then. So what would be the
steps? We can use the offlineimap approach as an example.
Let's start simple: assume static labels.
* Ask google for the labels of a message. This is documented at
https://developers.google.com/gmail/imap/imap-extensions. It should be possible
to download labels for multiple messages (eg, whole mailbox) at once.
* Define a new internal header, like X-Keywords (or X-GM-LABELS). Populate and
save this when writing messages to disk.
* Only download the All Mail folder, avoiding duplicates. Let an auxiliary
program (eg, mu) construct the mailboxes by searching on our new X-Keywords.
Then allow for labels that change:
* On syncing, get all labels for all messages. Compare to the X-Keywords on
disk and see if any have changed on the remote end.
This step requires matching up the messages, presumably uid. Will this be
fast? Does mbsync have a database or hashtable?
* When changing the label locally, submit this information to gmail using the
STORE command.
Do you have a good strategy for testing during development? Are there other
IMAP configurations besides google that we need to avoid mangling as we add new
functionality for this specific use case?
Does this seem like a feasible approach to you? You mentioned that this came up
in December --- is there a thread that might have additional ideas to consider?
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