Magic MIME

[Juri Linkov]

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
http://www.jurta.org/emacs/