query on a subset of messages ?

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+From: Sebastien Binet <binet@cern.ch>\r
+To: Notmuch developer list <notmuch@notmuchmail.org>\r
+CC: \r
+Subject: query on a subset of messages ?\r
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+Date: Mon, 9 Jul 2012 10:25:48 +0200\r
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+--=-=-=\r
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+\r
+\r
+hi there,\r
+\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
+\r
+ie:\r
+db, status := notmuch.OpenDatabase(db_path,\r
+               notmuch.DATABASE_MODE_READ_WRITE)\r
+query := db.CreateQuery("(tag:new AND tag:inbox)")\r
+msgs := query.SearchMessages()\r
+for _,msg := range msgs {\r
+  tag_msg(msg, tagqueries)\r
+}\r
+\r
+\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@notmuchmail.org or subject:notmuch"\r
+    }\r
+]\r
+\r
+\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
+\r
+I couldn't find any C-API to do such a thing using the notmuch library.\r
+did I overlook something ?\r
+\r
+Is it something useful to add ?\r
+\r
+-s\r
+\r
+--=-=-=\r
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