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Subject: bug#60787: setq-mode-local doesn't work for buffers not visiting files
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Hello,

  (setq-mode-local diff-mode view-read-only nil)

doesn't affect *vc-diff* buffers, but it should, according to the docstring of
setq-mode-local.

-- 
Sean Whitton

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To: Sean Whitton <spwhitton@HIDDEN>
Subject: bug#60787: Acknowledgement (setq-mode-local doesn't work for
 buffers not visiting files)
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Subject: bug#60787: setq-mode-local doesn't work for buffers not visiting files
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>   (setq-mode-local diff-mode view-read-only nil)
>
> doesn't affect *vc-diff* buffers, but it should, according to the docstring of
> setq-mode-local.

Is this because of the condition `(buffer-file-name b)`
in mode-local-map-file-buffers?

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Subject: bug#60787: setq-mode-local doesn't work for buffers not visiting files
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Hello,

On Tue 17 Jan 2023 at 09:31AM +02, Juri Linkov wrote:

>>   (setq-mode-local diff-mode view-read-only nil)
>>
>> doesn't affect *vc-diff* buffers, but it should, according to the docstring of
>> setq-mode-local.
>
> Is this because of the condition `(buffer-file-name b)`
> in mode-local-map-file-buffers?

Yes, but also how setq-mode-local relies on find-file-hook.

-- 
Sean Whitton

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> Cc: 60787 <at> debbugs.gnu.org
> From: Sean Whitton <spwhitton@HIDDEN>
> Date: Wed, 18 Jan 2023 15:42:42 -0700
> 
> On Tue 17 Jan 2023 at 09:31AM +02, Juri Linkov wrote:
> 
> >>   (setq-mode-local diff-mode view-read-only nil)
> >>
> >> doesn't affect *vc-diff* buffers, but it should, according to the docstring of
> >> setq-mode-local.
> >
> > Is this because of the condition `(buffer-file-name b)`
> > in mode-local-map-file-buffers?
> 
> Yes, but also how setq-mode-local relies on find-file-hook.

All of mode-local.el is written under the assumption that only
file-visiting buffers are supported.  Evidently, it assumes that modes
for buffers that don't visit files are "not interesting" enough.  This
assumption is explicitly in the doc strings of some of its functions.

I don't know why this was the assumption (maybe because CEDET was
about support of editing program source files?), but if we want to
lift the restriction, it would require changing many of the functions
in the package, not just this one.  Maybe we should do that.
mode-local.el wasn't significantly changed since it was added to Emacs
as part of CEDET merge, so maybe it's time to extend it?

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From: Sean Whitton <spwhitton@HIDDEN>
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Hello,

On Thu 19 Jan 2023 at 08:31AM +02, Eli Zaretskii wrote:

>> Cc: 60787 <at> debbugs.gnu.org
>> From: Sean Whitton <spwhitton@HIDDEN>
>> Date: Wed, 18 Jan 2023 15:42:42 -0700
>>
>> On Tue 17 Jan 2023 at 09:31AM +02, Juri Linkov wrote:
>>
>> >>   (setq-mode-local diff-mode view-read-only nil)
>> >>
>> >> doesn't affect *vc-diff* buffers, but it should, according to the docstring of
>> >> setq-mode-local.
>> >
>> > Is this because of the condition `(buffer-file-name b)`
>> > in mode-local-map-file-buffers?
>>
>> Yes, but also how setq-mode-local relies on find-file-hook.
>
> All of mode-local.el is written under the assumption that only
> file-visiting buffers are supported.  Evidently, it assumes that modes
> for buffers that don't visit files are "not interesting" enough.  This
> assumption is explicitly in the doc strings of some of its functions.
>
> I don't know why this was the assumption (maybe because CEDET was
> about support of editing program source files?), but if we want to
> lift the restriction, it would require changing many of the functions
> in the package, not just this one.  Maybe we should do that.
> mode-local.el wasn't significantly changed since it was added to Emacs
> as part of CEDET merge, so maybe it's time to extend it?

Sounds good to me.

-- 
Sean Whitton

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Subject: bug#60787: setq-mode-local doesn't work for buffers not visiting files
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Hello,

On Thu 19 Jan 2023 at 08:31am +02, Eli Zaretskii wrote:

> All of mode-local.el is written under the assumption that only
> file-visiting buffers are supported.  Evidently, it assumes that modes
> for buffers that don't visit files are "not interesting" enough.  This
> assumption is explicitly in the doc strings of some of its functions.
>
> I don't know why this was the assumption (maybe because CEDET was
> about support of editing program source files?), but if we want to
> lift the restriction, it would require changing many of the functions
> in the package, not just this one.  Maybe we should do that.
> mode-local.el wasn't significantly changed since it was added to Emacs
> as part of CEDET merge, so maybe it's time to extend it?

I discovered something today that someone working on making
setq-mode-local more general purpose would want to consider.

Currently setq-mode-local overrides .dir-locals.el.
But that's probably not what's most useful.
For example, if you have

    (setq-mode-local prog-mode indent-tabs-mode nil)

then this defeats the .dir-locals.el in the Emacs source tree which
specifically enables indent-tabs-mode for C source files.  But someone
who wants to default to indent-tabs-mode off for programming probably
does not want .dir-locals.el overridden in this way.

-- 
Sean Whitton

Last modified: Tue, 25 Nov 2025 20:30:02 UTC

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