Possible addtions to notmuch new ?

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+Date: Mon, 12 Aug 2013 11:34:43 +0200\r
+From: Vladimir Marek <Vladimir.Marek@Oracle.COM>\r
+To: notmuch@notmuchmail.org\r
+Subject: Possible addtions to notmuch new ?\r
+Message-ID: <20130812093443.GB16684@virt.cz.oracle.com>\r
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+\r
+Hi,\r
+\r
+My mail setup is a directory containing several subdirectories each\r
+subdirectory corresponds to one real mail account I am using. Each mail\r
+account is synchronized differently - I am using offlineimap, fetchmeail\r
+or even synthetically created emails (I am writing very simple jabber<->\r
+mail gate).Every now and then I am running 'notmuch new' to discover new\r
+emails and make them available in my MUA.\r
+\r
+That works pretty well, but has some disadvantages too\r
+ - notmuch new takes very long time (30s) during which the notmuch\r
+   database seems to be locked for any other updates from my MUA\r
+ - notmuch new takes long time because it always processes my archive\r
+   dir containing many files. That's mostly un-necessary as typically\r
+   there's no new mail delivered\r
+ - I don't have the possibility of passing new mails through procmail.\r
+   That would be useful for example for changing cron mail subjects,\r
+   putting related automated mails into threads (bugzilla, etc.).\r
+\r
+\r
+I was thinking that if we could split the new mail discovery from\r
+it's processing, it would solve the disadvantages I'm facing. Something\r
+like\r
+\r
+notmuch new --verbose --dry-run [dir] | my_filter | notmuch insert -\r
+\r
+It would work\r
+ - --dry-run would not lock and change the database\r
+ - --verbose would print the changes to stdout/stderr. Something like:\r
+\r
+new mail/file.1\r
+new mail/file.2\r
+deleted mail/file.3\r
+renamed mail/file.4 mail/file.5\r
+...\r
+\r
+[dir] would limit the scope of 'notmuch' new search to dir and it's\r
+subdirectories. Alternatively we could have set of include or exclude\r
+rules similarly to rsync (for example), but [dir] is easier to\r
+implement.\r
+\r
+'my_filter' would be my script which could change the contents of emails\r
+before they are inserted into notmuch database.\r
+\r
+Notmuch insert would be able to not only add new mails, but also remove\r
+old ones or note that the file was renamed.\r
+\r
+How would this sound?\r
+\r
+I'm not saying I would implement this, I'm rather curious where would\r
+you like to see notmuch in the future.\r
+\r
+Cheers\r
+-- \r
+       Vlad\r