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From: larsi@ifi.uio.no (Lars Magne Ingebrigtsen)
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Subject: Re: Group sorting
Date: 12 Dec 1995 21:59:56 +0100
Organization: Dept. of Informatics, University of Oslo, Norway
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dreschs@mpd.tandem.com (Sten Drescher) writes:

> (setq gnus-group-sort-function '(gnus-group-sort-by-level
>                                 gnus-group-sort-by-unread))
> 
> 	This would first do a complete sorting by level, then a complete
> sorting by unread - 2 complete sorts.  I'd want it to work in a single
> sort - the sort would compare the unread keys, and _only_ if they
> matched, compare the level keys. 

Ok, that would be workable.  Gnus could transmogrify that list to

(lambda (g1 g2)
  (or (gnus-group-sort-by-unread g1 g2)
      (and (not (gnus-group-sort-by-unread g2 g1))
	   (gnus-group-sort-by-level g1 g2))))

and give that as the predicate to sort.  Won't this give you the same
results as first using `gnus-group-sort-by-level' as a predicate and
then `gnus-group-sort-by-unread' as a predicate for sort?

I have no idea whether it will be faster, though...

(`gnus-group-sort-by-level' should really be called
`gnus-group-level-less' or something since it is a `less' function and
not an actual sorting function...)

-- 
Home is where the cat is.