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+From: Austin Clements <aclements@csail.mit.edu>\r
+To: Peter Zijlstra <peterz@infradead.org>, notmuch@notmuchmail.org\r
+Subject: Re: [PATCH] notmuch: Add "maildir:" search option\r
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+Date: Tue, 12 Nov 2013 14:39:52 -0500\r
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+\r
+On Tue, 12 Nov 2013, Austin Clements <aclements@csail.mit.edu> wrote:\r
+> I think this is a great idea. Personally I think this is how folder:\r
+> should work. I find the semantics of folder: to be useless except where\r
+> they happen to coincide with the boolean semantics used here.\r
+> Unfortunately, changing folder: would require versioning the database,\r
+> which we have only primordial support for right now.\r
+>\r
+> Various comments below, though nothing major. Of course, we'd also need\r
+> some tests and man page updates for this.\r
+\r
+Sorry, one important thing I missed: this doesn't correctly handle when\r
+file names are removed from a message\r
+(_notmuch_message_remove_filename). Probably the simplest thing would\r
+be to follow the template for how folder: works by first removing *all*\r
+folder terms and then adding back the still-valid ones. (Unfortunately,\r
+just removing the term for the removed filename's directory won't work\r
+because the message could have other filenames in the same directory,\r
+though maybe you could just scan for that possibility?)\r