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+To: Austin Clements <amdragon@MIT.EDU>\r
+Subject: Re: The overloading of show (was Re: [PATCH] Output unmodified\r
+ Content-Type header value for JSON format.)\r
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+From: David Edmondson <dme@dme.org>\r
+Date: Mon, 16 Jan 2012 13:50:43 +0000\r
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+--=-=-=\r
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+On Sat, 14 Jan 2012 19:36:17 -0500, Austin Clements <amdragon@MIT.EDU> wrot=\r
+e:\r
+> ...there are several levels of structure here:\r
+>=20\r
+> 1. Threads (query results)\r
+> 2. Thread structure\r
+> 3. Message structure (MIME)\r
+> 4. Part content\r
+>=20\r
+> Currently, search returns 1; show --format=3Djson returns 2, 3, and\r
+> sometimes 4 (but sometimes not); and show --format=3Draw returns 4.\r
+> Notably, 1 does not require opening message files (neither does 2),\r
+> which I consider an important distinction between search and show.\r
+>=20\r
+> Some of the discussion has been about putting 4 squarely in the realm\r
+> of show --format=3Draw. One counterargument (which has grown on me\r
+> since this discussion) is that the part content included in\r
+> --format=3Djson can be thought of as pre-fetching content that clients\r
+> are likely to need in order to avoid re-parsing the message in most\r
+> circumstances. I believe this is not the *intent* of the current\r
+> code, though without a specification of the JSON format it's hard to\r
+> tell.\r
+\r
+The JSON output included what was considered useful (mostly for the\r
+Emacs UI), but how much deep thought went into 'useful' I couldn't say.\r
+\r
+> Other discussion (more interesting, in my mind) has been about\r
+> separating retrieving thread structure, 2, from retrieving message\r
+> structure, 3. To me, splitting these feels much more natural than\r
+> what we do now, which seems to be inflexibly bound to the specific way\r
+> the Emacs show mode currently works. The thread structure is readily\r
+> available from the database, so I think separating these would open up\r
+> some new UI opportunities, particularly easy and fast thread outlining\r
+> and navigation.\r
+\r
+Given that the current output already includes both 2 and 3, anything\r
+that could be done with 2 can be done with the current output, so\r
+there's no block on the kind of innovation that you describe other than\r
+possibly some performance problems.\r
+\r
+notmuch-lkml.el[1] was a quick prototype of an alternative way to find\r
+messages to read based on suggestions from Aneesh. It could have used\r
+the proposed 'thread structure only' output.\r
+\r
+The changes you allude to make sense. My only concern would be any\r
+potential impact on the current Emacs UI's use of JSON output. Switching\r
+to a model where a typical 'notmuch-show' buffer requires many calls to\r
+notmuch (and commensurate JSON parsing) may perform significantly worse\r
+than the current approach.\r
+\r
+> I believe it would also simplify the code and address some irritating\r
+> asymmetries in the way notmuch show handles the --part argument.\r
+\r
+Footnotes:=20\r
+[1] http://dme.org/data/emacs/notmuch-lkml.el\r
+\r
+\r
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projects / notmuch-archives.git / commitdiff