[Patch] tell expiry-hook functions where expired messages are going

[Eric Abrahamsen <eric@ericabrahamsen.net>]

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This patch lets functions registered in the
`summary-article-expire-hook' know which group the expired articles are
going to. In particular this is useful for the registry: if people are
using expiration to move articles to a different group, rather than
deleting them, the registry should know where they've gone.

If nnmail-expiry-target is a function, this will still work, but not
quite as the docstring says: the hook function is given the from-group
as an argument, but is *not* called in a buffer narrowed to the message,
as it says. That would be hard to do, though, and this seems better than
nothing.

Eric


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From d89d596301fae28f94ce2370b7affe8719361ce3 Mon Sep 17 00:00:00 2001
From: Eric Abrahamsen <eric@ericabrahamsen.net>
Date: Tue, 29 Jul 2014 16:53:09 +0800
Subject: [PATCH] Tell expiry-hook functions where the message is going

* lisp/gnus-sum.el (gnus-summary-expire-articles): functions
  registered to the gnus-summary-article-expire-hook should be told
  where the function is going. In particular, the gnus registry might
  want to know.
---
 lisp/gnus-sum.el | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lisp/gnus-sum.el b/lisp/gnus-sum.el
index c0e099b..4f061cd 100644
--- a/lisp/gnus-sum.el
+++ b/lisp/gnus-sum.el
@@ -10449,7 +10449,10 @@ This will be the case if the article has both been mailed and posted."
 					(gnus-data-header
 					 (assoc article (gnus-data-list nil)))
 					gnus-newsgroup-name
-					nil
+					(if (fboundp nnmail-expiry-target)
+					    (funcall nnmail-expiry-target
+						     gnus-newsgroup-name)
+					  nnmail-expiry-target)
 					nil)))))))
 	(gnus-message 6 "Expiring articles...done")))))
 
-- 
2.0.3