tagging moved messages

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+Date: Sat, 19 May 2012 17:40:43 +0200\r
+From: Emmanuel Beffara <manu@beffara.org>\r
+To: notmuch@notmuchmail.org\r
+Subject: tagging moved messages\r
+Message-ID: <20120519154043.GA7220@chantourne>\r
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+\r
+Hello,\r
+\r
+What would be the proper way of automatically tagging messages whose\r
+file has been renamed?\r
+\r
+My use case is the following:\r
+\r
+In order to have some synchronization of tags between several machines,\r
+I use folders on the IMAP server. The idea is simply that messages\r
+tagged "foo" are actually moved to a folder "foo". The same applies to\r
+the "inbox" tag, and as an exception, messages in a folder named "saved"\r
+are those with no tags. Of course this excludes having several tags on a\r
+given message (except for the special tags like "unread" and "signed"),\r
+but it does fit my needs for now. The post-new hook says this:\r
+\r
+    #!/bin/sh\r
+    for FOLDER in *\r
+    do\r
+        case $FOLDER in\r
+        INBOX) TAG=inbox ;;\r
+        Drafts) TAG=draft ;;\r
+        Trash) TAG=killed ;;\r
+        saved) continue ;;\r
+        *) TAG=$FOLDER\r
+        esac\r
+        notmuch tag -$TAG -- tag:$TAG not folder:$FOLDER\r
+        notmuch tag +$TAG -- folder:$FOLDER not tag:$TAG\r
+    done\r
+\r
+It does work but it is rather slow: 8 seconds, for a collection of 16000\r
+messages. I can live with that but it does involve browsing the whole\r
+collection for each tag. Having a tag on all moved messages, like for\r
+the new ones, would dramatically improve this process.\r
+\r
+Besides, the "folder:" prefix is not an exact search, so the above does\r
+not work well if one folder name is part of another, like if I had a\r
+folder "bar" and a folder "foo.bar". Is there a way around this?\r
+\r
+I have another script called "pre-sync" that moves messages to folders\r
+according to their tags. This one is called before offlineimap does the\r
+full actual synchronization (calling notmuch new after that).\r
+\r
+I welcome any comments on my usage pattern, as there may well be better\r
+approaches I didn't think of...\r
+\r
+-- \r
+Emmanuel\r