GNU bug report logs - #23184
25.0.92; User-friendly way to override doc-view-mode as MIME viewer

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From: Tassilo Horn <tsdh <at> gnu.org>
To: Eli Zaretskii <eliz <at> gnu.org>, Teemu Likonen <tlikonen <at> iki.fi>
Cc: 23184 <at> debbugs.gnu.org
Subject: bug#23184: 25.0.92; User-friendly way to override doc-view-mode as MIME viewer
Date: Sat, 09 Apr 2016 12:21:35 +0200

Hi Teemu and Eli,

that's exactly my intention: have a simple way to override emacs heuristic 
choices in case where they don't match the user's expectations. So in your 
case, you'd be fine with just a single entry for application/pdf and your 
preferred viewer.

The problem with an option to simply use ~/.mailcap is that in there, you 
cannot use emacs viewers at all.

Bye,
Tassilo


Am 9. April 2016 11:47:50 schrieb Eli Zaretskii <eliz <at> gnu.org>:

>> From: Teemu Likonen <tlikonen <at> iki.fi>
>> Date: Sat, 09 Apr 2016 12:27:38 +0300
>> Cc: 23184 <at> debbugs.gnu.org
>>
>> > (2) Or maybe we could add a customizable list `mailcap-user-mime-data'
>> >     (better name welcome) which would override `mailcap-mime-data',
>> >     i.e., if a viewer is specified there, then `mailcap-mime-data' with
>> >     the heuristics around it won't even be consulted.
>>
>> > Any better suggestions?  If not, I can do that.  (In case I'd implement
>> > that, should that go only into master or emacs-25?)
>>
>> I don't oppose mailcap-user-mime-data but I think user shouldn't be
>> forced to duplicate his mailcap configuration inside Emacs.
>
> Does that suggestion really require duplication, or does it require to
> have only those (hopefully few) entries that override the default?
>
>> User already has his system's mailcap settings and many programs
>> respect that. Why doesn't Emacs? (Ok, it does but with its own
>> preferences of doc-view-mode etc.)
>
> Because doc-view-mode is specific to Emacs?
>
>> How about a variable like mailcap-prefer-system-mailcap with a non-nil
>> value would put the priority of doc-view-mode (and every viewer Emacs
>> offers) below system's mailcap configuration?
>
> That'd still require a separate customization in Emacs, so I wonder
> how it is better than what Tassilo proposed.
>

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