Re: magic-mode-alist has too high a priority

[Dominique de Waleffe]

Stefan Monnier wrote:
> When auto-mode-alist decides the buffer should use mode Foo and
> magic-mode-alist thinks it should be type Bar, we have the
> following possibilities:
> - the file name's extension is wrong: we should use Bar.
> - the magic code is wrong: we should use Foo.
> - both are wrong.
> - both are correct.
>
> My guess is that in 99% of the cases, both are "correct".
Agreed.

> So I suggest something like: magic-mode-alist doesn't take precedence over
> auto-mode-alist.  Instead, we look them up both, and if there's a conflict,
> we lookup a new var `mode-precedence-alist' to see if the user prefers one
> over the other.  If that doesn't resolve the conflict, check
> `derived-mode-p'.  If the conflict is still not resolved, prompt the user.

Indeed, that would allow both behaviours. Add that the default behaviour 
should probably be made as to be the least surprising for users (i.e. 
prefer auto-mode to magic).

D.
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Dominique de Waleffe
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