GNU bug report logs - #12199
c-guess doesn't guess indent-tabs-mode

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

From: Johan Walles <johan.walles <at> gmail.com>
To: submit <at> debbugs.gnu.org
Subject: c-guess doesn't guess indent-tabs-mode
Date: Tue, 14 Aug 2012 09:20:37 +0200

Package: emacs
Version: 24.1.1

Hi Emacsers!

c-guess seems not to guess the correct value for indent-tabs-mode.

Try this:
1. Set indent-tabs-mode to nil.
2. Load a C file indented with tabs.
3. c-guess
4. Do describe-variable on indent-tabs-mode

Current result:
"Its value is nil"

Expected result:
"Its value is t" (since c-guess should have noticed that tabs are used
for indentation)

Note:
In my case this makes c-guess much less useful than it could have
been, since I work on both tab and space indented files.

  Regards //Johan

Message #8 received at 12199 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefan <at> marxist.se>
To: Johan Walles <johan.walles <at> gmail.com>
Cc: 12199 <at> debbugs.gnu.org
Subject: Re: bug#12199: c-guess doesn't guess indent-tabs-mode
Date: Thu, 31 Oct 2019 00:28:20 +0100

found 12199 26.1
thanks

Johan Walles <johan.walles <at> gmail.com> writes:

> Package: emacs
> Version: 24.1.1
>
> Hi Emacsers!
>
> c-guess seems not to guess the correct value for indent-tabs-mode.
>
> Try this:
> 1. Set indent-tabs-mode to nil.
> 2. Load a C file indented with tabs.
> 3. c-guess
> 4. Do describe-variable on indent-tabs-mode
>
> Current result:
> "Its value is nil"
>
> Expected result:
> "Its value is t" (since c-guess should have noticed that tabs are used
> for indentation)
>
> Note:
> In my case this makes c-guess much less useful than it could have
> been, since I work on both tab and space indented files.
>
>   Regards //Johan

I can reproduce this on Emacs 26.1.  I'm not sure if this is a bug or a
feature request.

Best regards,
Stefan Kangas

Message #13 received at 12199 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Johan Walles <johan.walles <at> gmail.com>
Cc: Alan Mackenzie <acm <at> muc.de>, 12199 <at> debbugs.gnu.org
Subject: Re: bug#12199: c-guess doesn't guess indent-tabs-mode
Date: Tue, 01 Jun 2021 09:35:19 +0200

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

Johan Walles <johan.walles <at> gmail.com> writes:

> Try this:
> 1. Set indent-tabs-mode to nil.
> 2. Load a C file indented with tabs.
> 3. c-guess
> 4. Do describe-variable on indent-tabs-mode
>
> Current result:
> "Its value is nil"
>
> Expected result:
> "Its value is t" (since c-guess should have noticed that tabs are used
> for indentation)

This still seems to be the case in Emacs 28.

I've included my test file here.  Perhaps Alan has some insights here?
(Added to the CCs.)

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

[indent.c (text/x-csrc, inline)]

main () {
	foo();
	bar();
}

Message #16 received at 12199 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: acm <at> muc.de, 12199 <at> debbugs.gnu.org, johan.walles <at> gmail.com
Subject: Re: bug#12199: c-guess doesn't guess indent-tabs-mode
Date: Tue, 01 Jun 2021 15:01:42 +0300

> From: Lars Ingebrigtsen <larsi <at> gnus.org>
> Date: Tue, 01 Jun 2021 09:35:19 +0200
> Cc: Alan Mackenzie <acm <at> muc.de>, 12199 <at> debbugs.gnu.org
> 
> > Try this:
> > 1. Set indent-tabs-mode to nil.
> > 2. Load a C file indented with tabs.
> > 3. c-guess
> > 4. Do describe-variable on indent-tabs-mode
> >
> > Current result:
> > "Its value is nil"
> >
> > Expected result:
> > "Its value is t" (since c-guess should have noticed that tabs are used
> > for indentation)
> 
> This still seems to be the case in Emacs 28.
> 
> I've included my test file here.  Perhaps Alan has some insights here?
> (Added to the CCs.)

AFAICT, c-guess.el doesn't try to guess the value of indent-tabs-mode,
it only guesses indentation parameters specific to CC Mode.

IOW, this feature, if it belongs to c-guess.el, was never implemented.

Message #19 received at 12199 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: acm <at> muc.de, 12199 <at> debbugs.gnu.org, johan.walles <at> gmail.com
Subject: Re: bug#12199: c-guess doesn't guess indent-tabs-mode
Date: Wed, 02 Jun 2021 07:13:23 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

> AFAICT, c-guess.el doesn't try to guess the value of indent-tabs-mode,
> it only guesses indentation parameters specific to CC Mode.

Ah, right.  And looking more closely at that file, it doesn't talk about
indent-tabs-mode at all, so I guess this bug report it mistaken.  (But
as you say, it could possibly be a new feature.)

But c-guess works as documented here, I'm closing this bug report.

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

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