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Gnus: caching message headers?

From: Gregory Heytings
Subject: Gnus: caching message headers?
Date: Mon, 07 Sep 2020 15:23:32 +0000
User-agent: Alpine 2.22 (NEB 394 2020-01-19)

Hi list,

I'm trying to configure Gnus to access my email through IMAP.

I'm too accustomed to traditional MUAs to switch to the "Gnus way" in one step, so I have:

(setq gnus-permanently-visible-groups ".*")
(setq gnus-parameters
      (gnus-show-threads nil)
      (gnus-use-scoring nil)
      (gnus-article-sort-functions '(gnus-article-sort-by-number))
      (display . all))))

I would like to have, in the *Summary*, a complete list of the emails contained in a folder when I hit RET on its label. Each time I do this however, Gnus asks me how many articles I want to retrieve, and issues a "UID FETCH 1:N (UID RFC822.SIZE BODYSTRUCTURE BODY.PEEK[HEADER.FIELDS (...)])" IMAP command, which can take quite some time to complete when N is large.

Is there a way to convince Gnus to cache the result of that command (without caching all emails), and to issue a command only for the new UIDs? Caching the result of that command should not eat too much disk space.

I apologize in advance if that question is naïve, or if I missed some part of the manual.


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