[notmuch] hack to retag a directory

[david at tethera.net]

I think this will be obsolete pretty soon when the equivalent is
built-in to notmuch, but in the mean time, here is a script that
somebody might find useful: retag a whole directory (recursively). I
don't claim it is nice in any way, but it seems usable for me, taking
about 5 seconds to retag a directory containing 1000 messages.

I use it like 

  tagdir Maildir/.list.debian-devel -inbox +debian +devel

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