how to work with entire threads

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+Return-Path: <Vladimir.Marek@Oracle.COM>\r
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+Date: Tue, 9 Jul 2013 14:22:00 +0200\r
+From: Vladimir Marek <Vladimir.Marek@Oracle.COM>\r
+To: notmuch@notmuchmail.org\r
+Subject: how to work with entire threads\r
+Message-ID: <20130709122200.GA11501@virt.cz.oracle.com>\r
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+\r
+Hi,\r
+\r
+I would like to create the following process:\r
+\r
+ 1) if I tag any message with the keyword 'kill', it means that I don't\r
+   want to see any message from whole thread in my inbox\r
+\r
+At the moment I do something like\r
+\r
+THREADS=$(notmuch search --output=threads tag:kill)\r
+[ -z "$THREADS" ] || notmuch tag -unread -- '(' $THREADS ')'\r
+\r
+ 2) if there is such a 'killed' thread and it won't receive message for\r
+30 days, I want to remove the kill tag from the thread\r
+\r
+That I achieved by something like\r
+\r
+N=notmuch\r
+KILL=$( $N search --output=threads tag:kill )                                                                                                                                                          \r
+if [ -n "$KILL" ]; then\r
+   # Then find threads which contain messages younger than 30 days\r
+   KILL_RECENT=$( $N search --output=threads '(' $KILL ')' and date:30days.. )\r
+   KILL_RECENT=${KILL_RECENT:-'*'}\r
+   # Then find 'kill' threads not matching those recent\r
+   KILL_COUNT=$( $N count --output=threads '(' $KILL ')' and not '(' $KILL_RECENT ')' )\r
+   if [ $KILL_COUNT -gt 0 ]; then\r
+      echo "Threads to remove 'kill': $KILL"\r
+      $N tag -kill -- $( $N search --output=threads '(' $KILL ')' and not '(' $KILL_RECENT ')' )\r
+   fi\r
+fi\r
+\r
+\r
+\r
+I was thinking if it could not be simplified. Without knowing anything about\r
+notmuch or xapian internals, it seems that it would be handy to change the\r
+search pattern to return threads. My two previous examples would then read like\r
+\r
+1) notmuch tag -unread -- 'threads(tag:kill)'\r
+and\r
+2) notmuch tag -kill -- 'threads(tag:kill)' and not 'threads(date:30days..)'\r
+\r
+Given that this would be possible in the first place, wouldn't it be a nice\r
+addition to notmuch?\r
+\r
+Thank you\r
+-- \r
+       Vlad\r