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+Date: Thu, 6 Mar 2014 09:27:30 -0500\r
+From: Austin Clements <amdragon@MIT.EDU>\r
+To: David Belohrad <david@belohrad.ch>\r
+Subject: Re: how to specify notmuch colors in emacs24\r
+Message-ID: <20140306142730.GH4709@mit.edu>\r
+References: <uaxy50n1mu4.fsf@beesknees.cern.ch>\r
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+\r
+Quoth David Belohrad on Mar 06 at 2:24 pm:\r
+> Dear All,\r
+> \r
+> so far I'm changing some color faces programmatically:\r
+> \r
+> (setq notmuch-search-line-faces '(("deleted" . (:foreground "red"\r
+> :background "blue"))\r
+> ("unread" . (:foreground "DeepSkyBlue"))\r
+> ("flagged" . (:foreground "firebrick1"))\r
+> ))\r
+> \r
+> \r
+> I recently upgraded to emacs24. I was using default shipped tango-dark\r
+> theme. Then (because of VHDL mode I'm using) I have created a custom\r
+> theme, and I'd like to 'backport' the piece of code above into the\r
+> custom theme so it is in accordance with the philosophy of themes.\r
+> \r
+> I have no idea how to specify it using the 'class approach',as e.g.\r
+> \r
+> `(gnus-group-news-1 ((,class (:foreground ,plum-1))))\r
+> `(gnus-group-news-1-low ((,class (:foreground ,plum-2))))\r
+> \r
+> Any hint would be greatly appreciated\r
+\r
+I'm not sure what the values of `class', `plum-1', and `plum-2' are in\r
+your above snippet or what the context of that snippet is, so I may be\r
+misunderstanding your problem, but it may help to know that\r
+`gnus-group-news-1' and `notmuch-search-line-faces' are very different\r
+types of variables.\r
+\r
+The value of `gnus-group-news-1' is a face; something like\r
+(:foreground "plum1"). It looks like what you've written above is\r
+actually a "face specification", which uses a bunch of conditions (the\r
+,class part) to determine which of several potential faces to assign\r
+to the variable (though you listed only one face for each variable, so\r
+I'm not sure why you have a condition). It's unfortunate that Emacs\r
+distinguishes faces and face specification, but that's how it is.\r
+\r
+`notmuch-search-line-faces' is *not* a face variable like\r
+`gnus-group-news-1'. It's an association list that maps tags to\r
+faces. As such, it won't work if your theme is trying to treat it\r
+like a face variable, since its value is not a face, but rather a data\r
+structure that has faces in it.\r