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bug#2160: 23.0.60; Indentation of LOOP (cl-indent.el)

From: Stefan Kangas
Subject: bug#2160: 23.0.60; Indentation of LOOP (cl-indent.el)
Date: Sat, 29 Feb 2020 03:30:40 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux)

Lars Ingebrigtsen <address@hidden> writes:

> address@hidden writes:
>> When using `common-lisp-indent-function', LOOP forms are by default
>> indented as follows
>>   (loop for x in '(a b c)
>>      for y in '(1 2 3)
>>      collect (cons x y))
> (I'm going through old bug reports that unfortunately didn't get any
> response at the time.)
> This is still the case in Emacs 27.
>> Setting the following
>>   (setq lisp-simple-loop-indentation 1
>>         lisp-loop-keyword-indentation 6
>>         lisp-loop-forms-indentation 6)
>> makes it be indented like
>>   (loop for x in '(a b c)
>>         for y in '(1 2 3)
>>         collect (cons x y))
>> which I think is more readable, and more canonical.
>> I hence propose to change the default values in cl-indent.el of the
>> above variables accordingly.
> I agree that changing the default here would be a good idea, because
> that's a very non-standard Common Lisp indentation.  Does anybody object
> to changing it?

No further comments within 21 weeks, so I'll just chime in to say the
suggestion makes sense to me.  It seems to be the usual indentation in
the Common Lisp world, and I see no reason to do things differently.
It certainly makes the code more readable.

People have had ample time to protest, so perhaps we should just go
ahead and make the change on the master branch.

Best regards,
Stefan Kangas

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