[PATCH] Better error reporting in Gnus splitting.

[Karl Fogel <kfogel@red-bean.com>]

Any objections if I commit this patch?

Without this patch, when splitting encounters an error (say, an
invalid regular expression) in the nnmail-split-fancy list, then the
user is simply told that there is an error, but is given no details
about the error's nature.  The mail gets split into the 'bogus' mail
group, and the user has no idea why.

With this patch, the user is informed about the general nature of the
error and may then be able to track it down.  (The error report could
theoretically be even more informative than this, but I didn't want to
make a large change.)  The mail is still filtered into 'bogus' group.

See simple patch below.

-Karl

Index: ChangeLog
===================================================================
RCS file: /cvsroot/emacs/emacs/lisp/gnus/ChangeLog,v
retrieving revision 1.474
diff -u -r1.474 ChangeLog
--- ChangeLog	19 Jul 2006 01:06:00 -0000	1.474
+++ ChangeLog	19 Jul 2006 01:51:44 -0000
@@ -1,3 +1,9 @@
+2006-07-18  Karl Fogel  <kfogel@red-bean.com>
+
+	* nnmail.el (nnmail-article-group): If splitting raises an error, give
+	some information about the error when saying that the `bogus' mail
+	group will be used.
+
 2006-07-18  Andreas Seltenreich  <uwi7@rz.uni-karlsruhe.de>
 
 	[ Backported bug fixes from No Gnus. ]
Index: nnmail.el
===================================================================
RCS file: /cvsroot/emacs/emacs/lisp/gnus/nnmail.el,v
retrieving revision 1.33
diff -u -r1.33 nnmail.el
--- nnmail.el	9 Mar 2006 07:11:51 -0000	1.33
+++ nnmail.el	19 Jul 2006 01:51:45 -0000
@@ -1131,7 +1131,7 @@
 	(if (and (symbolp nnmail-split-methods)
 		 (fboundp nnmail-split-methods))
 	    (let ((split
-		   (condition-case nil
+		   (condition-case error-info
 		       ;; `nnmail-split-methods' is a function, so we
 		       ;; just call this function here and use the
 		       ;; result.
@@ -1139,7 +1139,7 @@
 			   '("bogus"))
 		     (error
 		      (nnheader-message
-		       5 "Error in `nnmail-split-methods'; using `bogus' mail group")
+		       5 "Error in `nnmail-split-methods'; using `bogus' mail group: %S" error-info)
 		      (sit-for 1)
 		      '("bogus")))))
 	      (setq split (mm-delete-duplicates split))