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Subject: bug#47146: 27.0.50; Unexpected indentation for pcase forms in emacs-lisp-mode
Resent-From: Markus Triska <triska@HIDDEN>
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Starting Emacs with:

    $ emacs -Q

I get the following indentation:

    (defun word (arg)
      (pcase arg
        ('love
         'amour)
        ('always
         'toujours)
        ('if
            'si)
        ('emacs
         'emacs)))

However, the indentation I expected is:

    (defun word (arg)
      (pcase arg
        ('love
         'amour)
        ('always
         'toujours)
        ('if
         'si)
        ('emacs
         'emacs)))

Thank you and all the best,
Markus

In GNU Emacs 27.0.50 (build 1, x86_64-apple-darwin18.0.0, X toolkit, Xaw scroll bars)
 of 2018-11-15 built on mac
Repository revision: b4eb908f858284a7962851fd99c94598f76afa6f
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
System Description:  Mac OS X 10.14.2

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Markus Triska <triska@HIDDEN>
Subject: bug#47146: Acknowledgement (27.0.50; Unexpected indentation for
 pcase forms in emacs-lisp-mode)
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Date: Sun, 14 Mar 2021 21:46:05 +0000

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Subject: bug#47146: 27.0.50; Unexpected indentation for pcase forms in emacs-lisp-mode
Resent-From: Lars Ingebrigtsen <larsi@HIDDEN>
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To: Markus Triska <triska@HIDDEN>
Cc: 47146 <at> debbugs.gnu.org, Stefan Monnier <monnier@HIDDEN>
From: Lars Ingebrigtsen <larsi@HIDDEN>
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Date: Thu, 18 Mar 2021 06:46:01 +0100
In-Reply-To: <m21rchigtu.fsf@HIDDEN> (Markus Triska's message of "Sun,
 14 Mar 2021 22:08:29 +0100")
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Markus Triska <triska@HIDDEN> writes:

> Starting Emacs with:
>
>     $ emacs -Q
>
> I get the following indentation:
>
>     (defun word (arg)
>       (pcase arg
>         ('love
>          'amour)
>         ('always
>          'toujours)
>         ('if
>             'si)
>         ('emacs
>          'emacs)))

I guess `lisp-indent-calc-next' is interpreting the "('if" as if it were
"(if"?

I must admit I have some difficulties in following the logic in that
function, perhaps Stefan has some insights here (added to CCs).

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

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#47146: 27.0.50; Unexpected indentation for pcase forms in emacs-lisp-mode
Resent-From: Stefan Monnier <monnier@HIDDEN>
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To: Lars Ingebrigtsen <larsi@HIDDEN>
Cc: Markus Triska <triska@HIDDEN>, 47146 <at> debbugs.gnu.org
From: Stefan Monnier <monnier@HIDDEN>
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References: <m21rchigtu.fsf@HIDDEN> <87y2elrp46.fsf@HIDDEN>
Date: Thu, 18 Mar 2021 09:51:30 -0400
In-Reply-To: <87y2elrp46.fsf@HIDDEN> (Lars Ingebrigtsen's message of "Thu,
 18 Mar 2021 06:46:01 +0100")
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>> Starting Emacs with:
>>
>>     $ emacs -Q
>>
>> I get the following indentation:
>>
>>     (defun word (arg)
>>       (pcase arg
>>         ('love
>>          'amour)
>>         ('always
>>          'toujours)
>>         ('if
>>             'si)
>>         ('emacs
>>          'emacs)))
>
> I guess `lisp-indent-calc-next' is interpreting the "('if" as if it were
> "(if"?

Looks like it, indeed.

> I must admit I have some difficulties in following the logic in that
> function, perhaps Stefan has some insights here (added to CCs).

I'm not very familiar with our Lisp indentation code, I'm afraid (so
much so that I often feel like replacing it with one based on SMIE, tho
I luckily recognize it as NIH-syndrome so I managed to resist the
temptation so far).


        Stefan

Last modified: Thu, 18 Mar 2021 14:00:02 UTC

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