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bug#4169: 23.1.50; default mode for xml files not correct

From: Lennart Borgman
Subject: bug#4169: 23.1.50; default mode for xml files not correct
Date: Tue, 18 Aug 2009 04:25:06 +0200

On Tue, Aug 18, 2009 at 4:18 AM, Stefan Monnier<address@hidden> wrote:
>>>> I wrote majmodpri.el (part of nXhtml) to take care of this kind of
>>>> problem and suggested that something like it should be included in
>>>> Emacs. There has not been any positive response to it yet.
>>>> The reason I wrote it was that this problem is much more prominent
>>>> when there are multi major modes as an alternative too. (For an xhtml
>>>> file for example you could use html-mode, nxml-mode, html-mumamo-mode,
>>>> nxhtml-mumamo-mode etc.)
>>> I'm not sure how emacs choose modes, or the policies, mechanisms, file
>>> locations...etc, or what majmodpri.el is supposed to do. Anyway, i thought
>>> this warrant a bug report for the record. Thanks.
>> Major modes are choosen by searching auto-mode-alist etc. The first
>> hit is choosen. (Sometimes the lists are searched several times
>> though.)
>> majmodpri.el sorts the list so that the major modes (or multi major
>> modes) that the user prefers comes first.
> When we offer several different modes for the same language
> (e.g. perl-mode vs cperl-mode), we should try to make auto-mode-alist
> (and other such facilities) point to a function alias (e.g. html-mode)
> which can then point to whichever major mode the user favors.
> E.g. we should probably rename sgml-mode.el's html-mode to
> sgml-html-mode, and then make (defalias 'html-mode 'sgml-html-mode) so
> that the user can easily (fset 'html-mode 'my-html-mode).

That is a good idea, but I would suggest using a table in between
instead of fset.

And a simple way to manipulate that table. (Maybe putting a property
like 'this-is-a-major-mode on major mode functions?)

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