Re: [RFC2 Patch 5/5] lib: iterator API for message properties

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+From: David Bremner <david@tethera.net>\r
+To: Daniel Kahn Gillmor <dkg@fifthhorseman.net>, notmuch@notmuchmail.org\r
+Subject: Re: [RFC2 Patch 5/5] lib: iterator API for message properties\r
+In-Reply-To: <87pos1u14p.fsf@alice.fifthhorseman.net>\r
+References: <1463927339-5441-1-git-send-email-david@tethera.net>\r
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+ <8760tthfuy.fsf@zancas.localnet> <87pos1u14p.fsf@alice.fifthhorseman.net>\r
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+Date: Wed, 01 Jun 2016 07:04:31 -0300\r
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+--=-=-=\r
+Content-Type: text/plain\r
+\r
+Daniel Kahn Gillmor <dkg@fifthhorseman.net> writes:\r
+\r
+> The other concern is our conception of how properties are unset/removed,\r
+> right?\r
+>\r
+> With tags, it's possible to include -blah to remove the tag "blah".  how\r
+> do we remove/clear/overwrite these tags?  what about using +key=val or\r
+> -key=val to set/unset certain key/value combinations, and a value-less\r
+> key= to remove all values matching a given key?\r
+>\r
+\r
+msg-id -blah is only possible if using notmuch-tag; notmuch restore takes a\r
+strict subset of the input format for "notmuch tag --batch".\r
+\r
+I'm not sure if generic property manipulation from the CLI is mandatory,\r
+or at least I'm not sure it's a blocker for including the feature.\r
+If/when we do decide to support it, I'm not sure if should be wedged\r
+into notmuch-tag, or rather added to a new "notmuch-property"\r
+subcommand.  Such a subcommand could take additional options and/or have\r
+a richer syntax than used in the dump file.\r
+\r
+I can imagine initial support with just an API, and some python\r
+bindings. This could already be used by some reference manipulation UI.\r
+The dump-restore support is more part of the backend in my mind, because\r
+we don't want people to think they've backup their data when they\r
+haven't.\r
+\r
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