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+Date: Sat, 8 Feb 2014 08:59:31 -0800\r
+From: "W. Trevor King" <wking@tremily.us>\r
+To: David Bremner <david@tethera.net>\r
+Subject: Re: [PATCH 2/2] emacs: Prefer Content-Description over filename for\r
+ part buttons\r
+Message-ID: <20140208165931.GB17142@odin.tremily.us>\r
+References: <877g9chbay.fsf@qmul.ac.uk>\r
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+\r
+On Sat, Feb 08, 2014 at 08:55:02AM -0400, David Bremner wrote:\r
+> "W. Trevor King" <wking@tremily.us> writes:\r
+> > Rather than patching this in Emacs, maybe we should collapse the\r
+> > =E2=80=9Cnot set=E2=80=9D and =E2=80=9Cset to empty string=E2=80=9D cas=\r
+es in notmuch-show.c? I\r
+> > can't think of any reasons why someone would want to distinguish\r
+> > those two cases, and it's easier all around if we standardize the\r
+> > representation as far upstream as possible.\r
+>=20\r
+> Do the RFCs have anything to say about headers with empty content?\r
+> If not I'd be inclined to leave the CLI output as raw as possible,\r
+> just because people are always finding new ways to apply tools.\r
+\r
+RFC 2183 does not describe Content-Description, it just uses it in\r
+some examples [1]. In all the examples where Content-Description is\r
+present, the value is not empty. RFC 2045 defines\r
+Content-Description, but it doesn't give all that much information\r
+[2]:\r
+\r
+ The ability to associate some descriptive information with a given\r
+ body is often desirable. For example, it may be useful to mark an\r
+ "image" body as "a picture of the Space Shuttle Endeavor." Such\r
+ text may be placed in the Content-Description header field. This\r
+ header field is always optional.\r
+\r
+ description :=3D "Content-Description" ":" *text\r
+\r
+ The description is presumed to be given in the US-ASCII character\r
+ set, although the mechanism specified in RFC 2047 may be used for\r
+ non-US-ASCII Content-Description values.\r
+\r
+I couldn't find more generic references to the meaning of empty header\r
+values, but I find it hard to imagine anyone assigning semantic value\r
+to an explicitly-empty description (vs. no Content-Description at\r
+all).\r
+\r
+Cheers,\r
+Trevor\r
+\r
+[1]: http://tools.ietf.org/html/rfc2183#section-3\r
+[2]: http://tools.ietf.org/html/rfc2045#section-8\r
+\r
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projects / notmuch-archives.git / commitdiff