Re: [notmuch] notmuch_threads_back and notmuch_messages_back

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+From: Carl Worth <cworth@cworth.org>\r
+To: Ruben Pollan <meskio@sindominio.net>, notmuch@notmuchmail.org\r
+In-Reply-To: <20091126202347.GA16654@blackspot>\r
+References: <20091126202347.GA16654@blackspot>\r
+Date: Fri, 27 Nov 2009 19:57:59 -0800\r
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+Subject: Re: [notmuch] notmuch_threads_back and notmuch_messages_back\r
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+\r
+On Thu, 26 Nov 2009 21:23:47 +0100, Ruben Pollan <meskio@sindominio.net> wrote:\r
+> Is it possible to implement notmuch_threads_back and notmuch_messages_back?\r
+> And I guess will make sense to have also notmuch_tags_back.\r
+> \r
+> This functions will do the oposite than notmuch_threads_advance and\r
+> notmuch_messages_advance. So I can use them as iterators going back and forward.\r
+> \r
+> I didn't check the implementation of notmuch. I don't know if will be easy or\r
+> will need to redesign a lot of code.\r
+\r
+Most cases of these iterators are built on Xapian iterators, (C++ objects with\r
+overloaded operators). So those are just using ++ for advance() and can\r
+easily use -- for the new function, (I'd like a verb that pairs better\r
+with "advance" than the non-verb "back"---any suggestions)?\r
+\r
+So those won't need any new code. The one case that will need new code\r
+is that for notmuch_message_get_replies and\r
+notmuch_message_get_toplevel_messages the messages iterator is currently\r
+built on a singly-linked list. Making it doubly linked would obviously\r
+not be hard though.\r
+\r
+-Carl\r