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From: Simon Josefsson <jas@extundo.com>
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Subject: Re: Semi-automatical update of article count in nnfolder?
Date: Thu, 17 Apr 2003 13:54:08 +0200
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kai.grossjohann@gmx.net (Kai Großjohann) writes:

> How does nnimap do it?  (I mean where is the entry point into the
> code where I need to start reading?)

(Warning: This code is so ugly it may make you go blind.)

gnus-fixup-nnimap-unread-after-getting-new-news is invoked via
gnus-setup-news-hook, and looks like:

(defun gnus-fixup-nnimap-unread-after-getting-new-news ()
  (let (server group info)
    (mapatoms
     (lambda (sym)
       (when (and (setq group (symbol-name sym))
		  (gnus-group-entry group)
		  (setq info (symbol-value sym)))
	 (gnus-sethash group (cons (nth 2 info) (cdr (gnus-group-entry group)))
		       gnus-newsrc-hashtb)))
     (if (boundp 'nnimap-mailbox-info)
	 (symbol-value 'nnimap-mailbox-info)
       (make-vector 1 0)))))

I.e., it iterates through all nnimap groups and forces the active info
to be what the variable nnimap-mailbox-info says, which is updated by
nnimap.