Re: [PATCH] emacs: Make the queries used in the all-tags section

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+Subject: Re: [PATCH] emacs: Make the queries used in the all-tags section\r
+From: Austin Clements <amdragon@mit.edu>\r
+To: Daniel Schoepe <daniel.schoepe@googlemail.com>\r
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+On Wed, May 25, 2011 at 6:04 AM, Daniel Schoepe\r
+<daniel.schoepe@googlemail.com> wrote:\r
+> On Wed, 25 May 2011 00:10:43 -0400, Austin Clements <amdragon@mit.edu> wr=\r
+ote:\r
+>> Out of curiosity, what use cases do you envision for this? =A0So far\r
+>> I've only heard two, both of which seem like great ideas, but neither\r
+>> of which require such a heavy-handed solution: displaying unread\r
+>> counts for tags rather than total counts, and hiding unused tags.\r
+>\r
+> Another thing I use this for, is to hide messages/threads with a\r
+> "killed"-tag.\r
+\r
+Ah, interesting.\r
+\r
+> I think a sensible compromise would be to allow either a function or a\r
+> string that is appended (which people could set to "and tag:unread") for\r
+> the proposed configuration variable and additionally to add a\r
+> variable that lists tags that should be hidden (which would also be\r
+> easily modifiable in M-x customize).\r
+\r
+In principle, I completely agree, but the little parser in my head\r
+screams "parse error!  parse error!" when I feed it "and tag:unread"\r
+and that bothers me.\r
+\r
+May I suggest a slightly different way of looking at this that will\r
+quell my inner parser?  Instead of configuring a weird "query\r
+fragment" like "and tag:unread" to be string-concatenated with the tag\r
+query, configure a *filter* query like merely "tag:unread" that\r
+narrows down what you'd like to be counted within the scope of a tag.\r
+The implementations are hardly different---simply generate the query\r
+"tag:<tag> and ( <filter> )"---but a filter is a well-formed query,\r
+not some string fragment.  Furthermore, the user can't get bitten by\r
+precedence and wind up with a query that counts messages that don't\r
+even have that tag.\r