GNU bug report logs - #76912
31.0.50; hack-local-variables docstring inaccurate about directory-local variables

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Package: emacs; Severity: minor; Reported by: Sean Whitton <spwhitton@HIDDEN>; dated Mon, 10 Mar 2025 08:59:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
Severity set to 'minor' from 'normal' Request was from Stefan Kangas <stefankangas@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at 76912 <at> debbugs.gnu.org:


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Date: Mon, 10 Mar 2025 18:51:53 +0200
Message-Id: <867c4wesly.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: Sean Whitton <spwhitton@HIDDEN>
In-Reply-To: <8734fll0sr.fsf@HIDDEN> (message from Sean
 Whitton on Mon, 10 Mar 2025 16:58:28 +0800)
Subject: Re: bug#76912: 31.0.50;
 hack-local-variables docstring inaccurate about directory-local
 variables
References: <8734fll0sr.fsf@HIDDEN>
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> From: Sean Whitton <spwhitton@HIDDEN>
> Date: Mon, 10 Mar 2025 16:58:28 +0800
> 
> We have:
> 
>     (defun hack-local-variables (&optional handle-mode inhibit-locals)
>       "Parse and put into effect this buffer's local variables spec.
>     For buffers visiting files, also puts into effect directory-local
>     variables.
> 
> but this second sentence is wrong -- buffers not visiting files get
> them, too.  For example
> 
> - emacs -Q
> - C-x v d ~/src/emacs/trunk/ RET
> - C-h v fill-column RET
> => local value of 72, from our .dir-locals.el, but VC-Dir is not a
>    file-visiting buffer.
> 
> I think this is not a bug in the implementation and the docstring just
> needs changing.  Would someone kindly confirm?

The code clearly calls hack-dir-local-variables, and has been doing so
since 2008, AFAICT.  As usual, we changed the code, but failed pt
update the doc string.

Note that the ELisp manual keeps silence about this aspect of
hack-local-variables.

It would be good to document which directory is used for non-file
buffers, btw.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#76912; Package emacs. Full text available.

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From: Sean Whitton <spwhitton@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 31.0.50; hack-local-variables docstring inaccurate about
 directory-local variables
Date: Mon, 10 Mar 2025 16:58:28 +0800
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Hello,

We have:

    (defun hack-local-variables (&optional handle-mode inhibit-locals)
      "Parse and put into effect this buffer's local variables spec.
    For buffers visiting files, also puts into effect directory-local
    variables.

but this second sentence is wrong -- buffers not visiting files get
them, too.  For example

- emacs -Q
- C-x v d ~/src/emacs/trunk/ RET
- C-h v fill-column RET
=> local value of 72, from our .dir-locals.el, but VC-Dir is not a
   file-visiting buffer.

I think this is not a bug in the implementation and the docstring just
needs changing.  Would someone kindly confirm?

-- 
Sean Whitton
Acknowledgement sent to Sean Whitton <spwhitton@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#76912; Package emacs. Full text available.
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Last modified: Mon, 10 Mar 2025 21:15:02 UTC

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