Re: getting article numbers from message-ids?

[Eric Abrahamsen <eric@ericabrahamsen.net>]

Eric Abrahamsen <eric@ericabrahamsen.net> writes:

> I'm starting with a list of org-gnus links, and trying to create an
> ephemeral group (via nnir) displaying those messages. I think
> everything's working, except that what I've got is each message's
> Message-ID, and nnir wants article numbers:
>
> Incoming: "nnimap+Server:group-name#A9ED-1B41EF8FC63E@example-server.fr"
>
> Outgoing: ["group-name" ARTICLE_NUMBER 100]
>
> I could, for each message link, use org-gnus-open to actually visit the
> message in its home group and get the article with
> `gnus-summary-article-number', but I'm hoping there's a more direct way.
>
> These message could be coming from any backend -- I can't know for sure
> if they'll be imap, or maildir, or what have you.
>
> Can the registry be used to save information like this? It would be nice
> to look first in the registry, which I assume would be quickest, and
> then fall back to something more manual and expensive.
>
> Anyway, any tips would be much appreciated!

Answering my own question:

(gnus-request-head "A9ED-1B41EF8FC63E@example-server.fr"
"nnimap+Server:group-name")

=>

("group-name" . ARTICLE_NUMBER)

No buffer setup or teardown, no messing about, extremely fast response.
A highly profitable two-and-a-half hours spent with the gnus codebase :)

E