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From: wmperry@aventail.com (William M. Perry)
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Subject: Re: Those MIME requirements
Date: 12 Sep 1998 20:32:41 -0500
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In-Reply-To: Lars Magne Ingebrigtsen's message of "12 Sep 1998 08:15:34 +0200"
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Lars Magne Ingebrigtsen <larsi@gnus.org> writes:

> Kai Grossjohann <grossjohann@amaunet.cs.uni-dortmund.de> writes:
> 
> > I think he's saying it should be possible to put Lisp in ~/.mailcap
> > which gets the content of a part as input, somehow.
> 
> Hm...  Does the mailcap format allow that?

  There are a lot of % escapes that you need to handle for mailcap.  Look
at mm-unescape-mime-test for some of them.  Here's a synopsis (at least of
what mm.el supports):

In viewers, you can put:
%u = URL
%s = filename

In tests, you can put:
%t = content-type
%{xxx} = header named xxx

It also recognizes but doesn't support:
%F = ""
%M = ""
%n = ""

I don't remember what those are for anymore... they were something that
wasn't real important for most of the tests in existence.

We could easily make the Emacs lisp portion of the mailcap to deal with
lisp viewers look like:

image/gif; xv %s; x-emacs-test=(builtin-emacs-viewer "%t"); \
           x-emacs-viewer=(message "Should view %f (%u) (%t)")

-Bill P.