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+ Thu, 19 Jul 2012 10:13:46 +0200\r
+From: Sebastien Binet <binet@cern.ch>\r
+To: Austin Clements <amdragon@MIT.EDU>\r
+Subject: Re: query on a subset of messages ?\r
+In-Reply-To: <87obno3luq.fsf@cern.ch>\r
+References: <871ukl5oj7.fsf@cern.ch> <20120709163000.GG18195@mit.edu>\r
+ <87obno3luq.fsf@cern.ch>\r
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+Date: Thu, 19 Jul 2012 10:13:25 +0200\r
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+Sebastien Binet <binet@cern.ch> writes:\r
+\r
+> Austin Clements <amdragon@MIT.EDU> writes:\r
+>\r
+>> Quoth Sebastien Binet on Jul 09 at 10:25 am:\r
+>>>=20\r
+>>> hi there,\r
+>>>=20\r
+>>> I was trying to reduce the I/O stress during my usual email\r
+>>> fetching+tagging by writing a little program using the go bindings to\r
+>>> notmuch.\r
+>>>=20\r
+>>> ie:\r
+>>> db, status :=3D notmuch.OpenDatabase(db_path,\r
+>>> notmuch.DATABASE_MODE_READ_WRITE)\r
+>>> query :=3D db.CreateQuery("(tag:new AND tag:inbox)")\r
+>>> msgs :=3D query.SearchMessages()\r
+>>> for _,msg :=3D range msgs {\r
+>>> tag_msg(msg, tagqueries)\r
+>>> }\r
+>>>=20\r
+>>>=20\r
+>>> where tagqueries is a subquery of the form:\r
+>>> [\r
+>>> {\r
+>>> "Cmd": "+to-me",\r
+>>> "Query": "(to:sebastien.binet@cern.ch and not tag:to-me)"\r
+>>> },\r
+>>> {\r
+>>> "Cmd": "+sci-notmuch",\r
+>>> "Query": "from:notmuch@notmuchmail.org or to:notmuch@notmuchmai=\r
+l.org or subject:notmuch"\r
+>>> }\r
+>>> ]\r
+>>>=20\r
+>>>=20\r
+>>> the idea being that I only need to crawl through the db only once and\r
+>>> then iteratively apply tags on those messages (instead of repeatedly\r
+>>> running "notmuch tag ..." for each and every of those many\r
+>>> 'tag-queries')\r
+>>>=20\r
+>>> I couldn't find any C-API to do such a thing using the notmuch library.\r
+>>> did I overlook something ?\r
+>>>=20\r
+>>> Is it something useful to add ?\r
+>>>=20\r
+>>> -s\r
+>>\r
+>> Have you tried a more direct translation of the multiple notmuch tag\r
+>> commands into Go, where you don't worry about subsetting the queries?\r
+>> Unless you're tagging a huge number of messages, the cost of notmuch\r
+>> tag is almost certainly the fsync that it does when it closes the\r
+>> database (which every call to notmuch tag must do). However, in Go,\r
+>> you can keep the database open across all of the tagging operations\r
+>> and then close and fsync it just once.\r
+>\r
+> nope, I haven't tried that, but will do.\r
+>\r
+>>\r
+>> Note that there is an important optimization in notmuch tag that you\r
+>> might have to replicate. It manipulates the original query to exclude\r
+>> messages that already have the desired tags, so that they get skipped\r
+>> very efficiently at the earliest stage possible.\r
+> I already have this in my original shell script.\r
+> (wouldn't be too hard to automatically do, though.)\r
+\r
+FYI, I've put this into a new notmuch-mtag go-based binary over here:\r
+https://github.com/sbinet/notmuch/blob/dev/go-bindings/bindings/go/src/notm=\r
+uch-mtag/main.go\r
+\r
+\r
+=2Ds\r
+\r
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projects / notmuch-archives.git / commitdiff