Re: [PATCH] WIP: regexp matching in subjects

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+ Tue, 07 Jun 2016 10:16:27 -0000\r
+From: David Bremner <david@tethera.net>\r
+To: Austin Clements <aclements@csail.mit.edu>\r
+Cc: sfischme@uwaterloo.ca, Gaute Hope <eg@gaute.vetsj.com>,\r
+ notmuch <notmuch@notmuchmail.org>\r
+Subject: Re: [PATCH] WIP: regexp matching in subjects\r
+In-Reply-To: <1465265149-7174-1-git-send-email-david@tethera.net>\r
+References:\r
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+Date: Tue, 07 Jun 2016 07:16:27 -0300\r
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+\r
+David Bremner <david@tethera.net> writes:\r
+\r
+> the idea is that you can run\r
+>\r
+> % notmuch search 'subject:rx:<your-favourite-regexp>'\r
+>\r
+> or\r
+>\r
+> % notmuch search subject:"your usual phrase search"\r
+>\r
+> This should also work with bindings.\r
+> ---\r
+>\r
+> Here is Austin's "hack", crammed into the field processor framework.\r
+> I seem to have broken one of the existing subject search tests with my\r
+> recursive query parsing. I didn't have time to figure out why, yet.\r
+\r
+A few hours sleep and I think I understand the issue.\r
+\r
+with\r
+\r
+        subject:"your usual phrase search"\r
+\r
+I believe the phrase-ness (word ordering and proximity) gets lost when\r
+using a field processor. So, since I don't know if/when this issue will\r
+be fixed in Xapian, we should probably use a seperate prefix for regexp\r
+search. This leads to two potential syntaxes\r
+\r
+        subject_re:"^i am first"\r
+\r
+        regexp:subject:"^i am first"\r
+\r
+If we did stick with the current syntax, one could use\r
+\r
+   subject:your-usual-phrase-search\r
+\r
+to preserve phraseness. Note that for regexps with spaces in them, the\r
+required quoting is a bit counterintuitive\r
+\r
+ ./notmuch  count 'subject:"rx:Graduate Committee"'\r
+\r
+That's a consequence of my faking "sub-prefixes". Which seemed clever at\r
+the time, but maybe not.\r
+\r
+d\r