GNU bug report logs - #18188
Please make it possible to have a directory-local setting for auto-mode-alist

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Reuben Thomas <rrt <at> sc3d.org>
To: bug-emacs <bug-emacs <at> gnu.org>
Subject: Please make it possible to have a directory-local setting for
 auto-mode-alist
Date: Mon, 4 Aug 2014 11:28:18 +0100

[Message part 1 (text/plain, inline)]

I'd like to use a different major mode for Javascript files in a particular
project from the one I use by default. At present this seems to be easy to
achieve only by changing auto-mode-alist; changing this idempotently in
.dir-locals.el is tricky.

As per
http://lists.gnu.org/archive/html/help-gnu-emacs/2011-01/msg00363.html ,
where Stefan Monnier said he thought this was a reasonable idea and a bug
should be filed, and as per
http://lists.gnu.org/archive/html/help-gnu-emacs/2011-01/msg00579.html
where Ted Zlatonov noticed that the original requester had not filed a bug,
I'm requesting this feature.

-- 
http://rrt.sc3d.org

[Message part 2 (text/html, inline)]

Message #12 received at 18188 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Tom Tromey <tom <at> tromey.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 18721 <at> debbugs.gnu.org, 18188 <at> debbugs.gnu.org
Subject: Re: bug#18188: Please make it possible to have a directory-local
 setting for auto-mode-alist
Date: Sat, 29 May 2021 06:07:40 +0200

Tom Tromey <tom <at> tromey.com> writes:

> Eli> So I'm asking why not keep the current syntax for this feature, and
> Eli> avoid introducing a new kind of special key?  This would mean your
> Eli> example above will look like this:
> Eli>   (nil . ((auto-mode-alist . (("\\.def\\'" . c-mode)))))
>
> I suppose it would work ok as long as the code also doesn't try to set
> auto-mode-alist locally in the buffer, both because that variable isn't
> safe, and because I think it doesn't make sense to set it buffer-locally
> anyhow.

I think everybody agreed that this was a good feature to add (with Eli's
tweaks), but as far as I can tell, it was never added.  Tom, would it be
possible for you to re-spin this patch for Emacs 28?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #15 received at 18188 <at> debbugs.gnu.org (full text, mbox):

From: Tom Tromey <tom <at> tromey.com>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: Eli Zaretskii <eliz <at> gnu.org>, Tom Tromey <tom <at> tromey.com>,
 18721 <at> debbugs.gnu.org, 18188 <at> debbugs.gnu.org
Subject: Re: bug#18188: Please make it possible to have a directory-local
 setting for auto-mode-alist
Date: Sat, 29 May 2021 09:13:58 -0600

Lars> I think everybody agreed that this was a good feature to add (with Eli's
Lars> tweaks), but as far as I can tell, it was never added.  Tom, would it be
Lars> possible for you to re-spin this patch for Emacs 28?

Doubtful, but it's fine by me if someone takes it over.  I don't recall
who objected or why, but someone didn't like the approach I took and
requested changes, so whoever does it would have to navigate this.

Tom

Message #18 received at 18188 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Tom Tromey <tom <at> tromey.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 18721 <at> debbugs.gnu.org, 18188 <at> debbugs.gnu.org
Subject: Re: bug#18721: 25.0.50; choose major mode from .dir-locals.el
Date: Fri, 23 Jul 2021 16:00:11 +0200

Tom Tromey <tom <at> tromey.com> writes:

> Lars> I think everybody agreed that this was a good feature to add (with Eli's
> Lars> tweaks), but as far as I can tell, it was never added.  Tom, would it be
> Lars> possible for you to re-spin this patch for Emacs 28?
>
> Doubtful, but it's fine by me if someone takes it over.  I don't recall
> who objected or why, but someone didn't like the approach I took and
> requested changes, so whoever does it would have to navigate this.

I've now respun the patch for Emacs 28, and it seems to work fine, and I
think everybody agreed that this was useful functionality.

There was some discussion about whether to introduce a new dir-locals
element for this, or just use the normal variable-setting thing.  As Tom
said, the normal thing is awkward to use here (because of the
buffer-local thing), so I think Tom's approach here is the best,
overall.

So I've now pushed this to Emacs 28.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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