GNU logs - #64589, boring messages

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Subject: bug#64589: 30.0.50; smie-config-guess can break ruby indentation
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In repro.rb:

def some_method
  return some_other_method(
    some_argument
  )
end

emacs -Q repro.rb
M-x smie-config-guess

Type:

foo(
x
)

The x will not be indented. If smie-config-guess is omitted, it indents
as expected.



In GNU Emacs 30.0.50 (build 55, aarch64-apple-darwin22.5.0, NS
 appkit-2299.60 Version 13.4.1 (Build 22F82)) of 2023-07-12 built on
 Aarons-Laptop.local
Repository revision: d861de72289464e336c772f1741016a90a2118c5
Repository branch: master
Windowing system distributor 'Apple', version 10.3.2299
System Description:  macOS 13.4.1

Configured using:
 'configure --with-ns --with-native-compilation --with-modules
 --without-dbus --without-webp --disable-ns-self-contained'

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Aaron Jensen <aaronjensen@HIDDEN>
Subject: bug#64589: Acknowledgement (30.0.50; smie-config-guess can break
 ruby indentation)
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Subject: bug#64589: 30.0.50; smie-config-guess can break ruby indentation
Resent-From: Dmitry Gutov <dmitry@HIDDEN>
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Hi Aaron,

On 13/07/2023 07:20, Aaron Jensen wrote:
> In repro.rb:
> 
> def some_method
>    return some_other_method(
>      some_argument
>    )
> end
> 
> emacs -Q repro.rb
> M-x smie-config-guess
> 
> Type:
> 
> foo(
> x
> )
> 
> The x will not be indented. If smie-config-guess is omitted, it indents
> as expected.

Sorry about the late reply.

But it seems like this feature might be incompatible with the relatively 
complex way the ruby-mode indentation is written (the comments inside 
'smie-config--guess' seem to indicate so). So while it does sound cool 
to be able to use style detection, it might only work okay for certain 
languages/indentation rules.

One thing to note, though, is that it seems to want larger files, to be 
able to "learn" from more cases. But when I provide a larger file, it 
usually ends up saying "Nothing to change", even if some lines are 
indented differently from the current config. E.g. if I just expand your 
example to:

   def some_method
     return some_other_method(
       some_argument
     )

     foo(
       bar,
       tee
     )
   end

then adding foo(<RET> at the end indents predictably okay.

Perhaps Stefan as the author could tell us whether it's at all feasible 
to adjust ruby-mode to be more compatible with smie-config-guesser, or 
whether there could be some low-hanging fruit in the latter to help.

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Subject: bug#64589: 30.0.50; smie-config-guess can break ruby indentation
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From: Aaron Jensen <aaronjensen@HIDDEN>
Date: Thu, 19 Oct 2023 17:41:19 -0400
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On Thu, Oct 19, 2023 at 4:05=E2=80=AFPM Dmitry Gutov <dmitry@HIDDEN> wro=
te:
>
> Hi Aaron,
>
> On 13/07/2023 07:20, Aaron Jensen wrote:
> > In repro.rb:
> >
> > def some_method
> >    return some_other_method(
> >      some_argument
> >    )
> > end
> >
> > emacs -Q repro.rb
> > M-x smie-config-guess
> >
> > Type:
> >
> > foo(
> > x
> > )
> >
> > The x will not be indented. If smie-config-guess is omitted, it indents
> > as expected.
>
> Sorry about the late reply.
>
> But it seems like this feature might be incompatible with the relatively
> complex way the ruby-mode indentation is written (the comments inside
> 'smie-config--guess' seem to indicate so). So while it does sound cool
> to be able to use style detection, it might only work okay for certain
> languages/indentation rules.
>
> One thing to note, though, is that it seems to want larger files, to be
> able to "learn" from more cases. But when I provide a larger file, it
> usually ends up saying "Nothing to change", even if some lines are
> indented differently from the current config. E.g. if I just expand your
> example to:
>
>    def some_method
>      return some_other_method(
>        some_argument
>      )
>
>      foo(
>        bar,
>        tee
>      )
>    end
>
> then adding foo(<RET> at the end indents predictably okay.
>
> Perhaps Stefan as the author could tell us whether it's at all feasible
> to adjust ruby-mode to be more compatible with smie-config-guesser, or
> whether there could be some low-hanging fruit in the latter to help.

Ok, thanks. The context here is that I use dtrt-indent and it invokes
this before doing its work. For now, I have disabled it in Ruby (which
I think is actually fine because I thankfully don't work with any Ruby
code that is something other than 2 spaces).

So right now, I'm not concerned about this personally, but it does
seem odd that it breaks indentation in some cases.

Thanks,

Aaron

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On 20/10/2023 00:41, Aaron Jensen wrote:
> Ok, thanks. The context here is that I use dtrt-indent and it invokes
> this before doing its work. For now, I have disabled it in Ruby (which
> I think is actually fine because I thankfully don't work with any Ruby
> code that is something other than 2 spaces).

All right.

> So right now, I'm not concerned about this personally, but it does
> seem odd that it breaks indentation in some cases.

Perhaps we'll simply end up documenting that it doesn't work for all 
SMIE modes, just for some. And dtrt-indent will have a whitelist.

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From: Stefan Monnier <monnier@HIDDEN>
In-Reply-To: <2c81d38d-2d92-8196-c481-e6fa59e94d01@HIDDEN> (Dmitry Gutov's
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Date: Thu, 19 Oct 2023 22:15:52 -0400
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> Perhaps we'll simply end up documenting that it doesn't work for all SMIE
> modes, just for some. And dtrt-indent will have a whitelist.

It's definitely the case that it's a "best effort" kind of tool, which
makes assumptions that don't always hold.
Using it unconditionally like `dtrt-indent` does seems ... optimistic,
but I'll take it as a compliment :-)


        Stefan

Last modified: Fri, 20 Oct 2023 02:30:02 UTC

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