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Re: dir-local vs major-mode setting

From: Stefan Monnier
Subject: Re: dir-local vs major-mode setting
Date: Wed, 14 Nov 2018 22:27:50 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

>>> If the project is expected to contain .tex files then the above would
>>> constitute a bug in the .dir-locals.el file (which should contain mode-
>>> specific entries for exceptions to the global settings).
>> The whole point of `nil` is that it's not mode-specific.
> Sorry, I shouldn't have said "global" there; that was confusing.
> I was referring to the nil case.
> i.e. I would expect the .dir-locals.el to have, say:
> ((nil . ((indent-tabs-mode . t)))
>  (tex-mode . ((indent-tabs-mode . nil))))
> So that tex-mode files don't use tabs, but other modes will.

But having to add

    (tex-mode . ((indent-tabs-mode . nil)))

when the major mode normally does it for you is kind of a let-down.

IOW, I think .dir-locals.el should offer some way to say "for files in
this directory, behave as if var `foo` was `setq-default` to `bar`".

> However, I've also just noticed that Emacs 26.1 appears to have broken/
> inverted the way that such overrides work.
> https://emacs.stackexchange.com/a/46005/454

That looks like a bug.


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