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+ id 1WAmCo-000142-PD; Tue, 04 Feb 2014 15:02:50 -0500\r
+Date: Tue, 4 Feb 2014 15:02:50 -0500\r
+From: Austin Clements <amdragon@MIT.EDU>\r
+To: Jani Nikula <jani@nikula.org>\r
+Subject: Re: [PATCH 0/5] lib: make folder: prefix literal\r
+Message-ID: <20140204200249.GO4375@mit.edu>\r
+References: <cover.1389304779.git.jani@nikula.org>\r
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+\r
+Quoth Jani Nikula on Feb 01 at 4:54 pm:\r
+> On Fri, 31 Jan 2014, Austin Clements <amdragon@MIT.EDU> wrote:\r
+> > What if we introduce two prefixes, say folder: and path: (maybe dir:?)\r
+> > to address both use cases, each as naturally as possible? Both would\r
+> > be boolean prefixes because of the limitations of probabilistic\r
+> > prefixes, but we could take advantage of Jani's idea of generating\r
+> > several boolean terms.\r
+> \r
+> Agreed. On to details:\r
+> \r
+> > folder: could work the way I suggested (simply the path to the file,\r
+> > with {cur,new} stripped off).\r
+> \r
+> What if the file is not in a folder named cur/new? I suggest indexing\r
+> the folder as-is, if only for some backwards compatibility.\r
+\r
+Agreed. I believe this will also support MH, if I understand MH\r
+correctly (does anyone actually use MH?)\r
+\r
+> What if there is not all of cur/new/tmp folders? I suggest ignoring\r
+> that, and only look at the path to the file being indexed. This is\r
+> simplest to implement, and it does not matter if the sibling directories\r
+> come and go, and for this reason also unsurprising.\r
+\r
+That sounds good to me.\r
+\r
+> For top level cur/new, index the empty string "".\r
+\r
+Yes.\r
+\r
+> > path: would support file system search\r
+> > uses. These seem more varied, but I think fall into exact match and\r
+> > recursive match. Since I don't have this use case, I can't have any\r
+> > strong opinions about syntax, but I'll throw out an idea: many shells\r
+> > support "**" for recursive path matching and people are already quite\r
+> > familiar with glob patterns for paths, so why not simply adopt this?\r
+> > In other words, when adding the path "a/b/cur/x:2," add path: terms\r
+> > "a/b/cur" and "a/b/**" and "a/**" and "**".\r
+> \r
+> Since folder: would cover the cur/new cases, I suggest the non-recursive\r
+> variant of path: prefix is the exact filesystem folder name as-is (with\r
+> the top level being the empty string ""). I presume this is what you\r
+> meant too.\r
+\r
+Yes. I suppose I didn't actually say it, but that's what I was\r
+thinking.\r
+\r
+> I kind of like the "/**" suffix for recursive, but there's two small\r
+> wrinkles: 1) it needs quoting on the command line (unlike my original\r
+> suggestion of just "/" suffix), and 2) what should the top level\r
+> recursive search be? path:"**" or path:"/**" or path:"./**"? I guess the\r
+> first one is most obvious?\r
+\r
+The shell quoting is annoying, but depending on the shell, it should\r
+at least give an error (zsh) or Just Work (apparently bash and sh pass\r
+the unexpanded glob through if it doesn't match anything?).\r
+\r
+> So here's what my original suggestions would become:\r
+> \r
+> >> Here's a thought. With boolean prefix folder:, we can devise a scheme\r
+> >> where the folder: query defines what is to be matched.\r
+> >> \r
+> >> For example:\r
+> >> \r
+> >> folder:foo match files in foo, foo/new, and foo/cur.\r
+> \r
+> -> folder:foo\r
+> \r
+> >> folder:foo/ match all files in all subdirectories under foo (this\r
+> >> would handle Tomi's use case), including foo/new and foo/cur.\r
+> \r
+> -> path:"foo/**"\r
+> \r
+> >> folder:foo/. match in foo only, and specifically not in foo/cur or foo/new.\r
+> \r
+> -> path:foo\r
+> \r
+> >> folder:foo/new match in foo/new, and specifically not in foo/cur (this\r
+> >> allows distinguishing between messages in cur and new).\r
+> \r
+> -> path:foo/new\r
+> \r
+> >> folder:/ match everything.\r
+> \r
+> -> path:"**"\r
+> \r
+> >> folder:/. match in top level maildir only.\r
+> \r
+> -> path:""\r
+> \r
+> >> folder:"" match in top level maildir, including cur/new.\r
+> \r
+> -> folder:""\r
+> \r
+> \r
+> I'd like these details to be ironed out and agreed on before I send the\r
+> next version.\r
+\r
+This all looks good to me.\r
+\r
+> BR,\r
+> Jani.\r
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