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Magic MIME

From: Juri Linkov
Subject: Magic MIME
Date: Mon, 11 Feb 2008 01:18:41 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.60 (gnu/linux)

Visiting an Arc Lisp file in Emacs fails with the error
"Buffer format not recognized".

Even though Emacs doesn't have an auto-mode-alist entry
associated with Arc, it should visit it in fundamental-mode,
not to fail trying to open it as an archive.  Archive files
have a well-known signature, and using content-based file
type recognition rather than filename-based is more reliable.
This will also improve the recognition of image file formats.

Are there any obstacles to using magic-mime to determine the file
type in Emacs?  If linking libmagic is not possible, then maybe
we could parse the magic.mime file, and even run the `file'
command directly on a visited file?

Juri Linkov

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