From: Philip Kaludercic <philipk@posteo.net>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: 65797@debbugs.gnu.org, Joseph Turner <joseph@breatheoutbreathe.in>
Subject: bug#65797: `buffer-match-p` should not use `func-arity`
Date: Mon, 18 Sep 2023 17:23:56 +0000 [thread overview]
Message-ID: <87sf7b8ker.fsf@posteo.net> (raw)
In-Reply-To: <jwv1qevpurs.fsf-monnier+emacs@gnu.org> (Stefan Monnier's message of "Mon, 18 Sep 2023 07:55:32 -0400")
Stefan Monnier <monnier@iro.umontreal.ca> writes:
>>>>>> FWIW The intention here was to be able and specify simpler conditions
>>>>>> that don't have to handle the alist.
>>>>> You mean for `display-buffer-alist`?
>>>>> Do you have examples that rely on this?
>>>> From the core? No, I cannot think of an example, but any user
>>>> configuration may make use of this feature.
>>> From the core would have been good, but from elsewhere (including
>>> random .emacs config you may find on the web) would be helpful to gauge
>>> how important that could be.
>> I don't know of any examples.
>
> In that case I suggest we deprecate this feature (i.e. the fact that
> the function can take a single arg).
>
>>>> I am not sure if I just missed it, but is there no technical solution
>>>> around the advice issue? Couldn't `func-arity' check if the actual
>>>> function and the advice function have the same arity, and return the
>>>> right value in that case? My impression is that in 99% of the cases,
>>>> advice isn't used to increase or decrease the arity of a function.
>>> There are various 99% solutions, yes.
>>> There is no 100% solution, OTOH :-(
>>> So the documented behavior is inherently unreliable.
>> So what are the options then?
>
> Alternatives I can see:
>
> - Deprecate the feature with no replacement (i.e. users will have
> to use a (lambda (x y) (foo x)) wrapper to drop the second arg if they
> were using the feature). That's my favorite option at this point.
I would be disappointed to see this path taken, since part of my hope
with buffer-match-p was that it could be used in project.el as well
(allowing this to be a thing is one of the reasons I started working on
Compat).
> - Replace it with some alternative (e.g. provide two different syntaxes
> for functions, one for functions that expect all args and one for
> functions that only take a single arg).
So `(arg1 ,(lambda (x) ...)) and `(arg2 ,(lambda (x y) ...))? Or only
one, and otherwise we assume that the function can be invoked with a
single/two arguments?
> - Live with the occasional breakage and bug reports like the current one.
The issue here was related to advising a function. And you are saying
there is no way around this, not even by annotating the function symbol
with the initial arity before it is advised.
>> Does one have to pick a 99% solution?
>
> Hopefully not. The 99% solution (whichever one is used) should
> hopefully only be used temporarily for backward compatibility while the
> feature is phased out.
>
>
> Stefan
>
--
Philip Kaludercic
next prev parent reply other threads:[~2023-09-18 17:23 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-07 7:53 bug#65797: 29.0.92; func-arity should not return (0 . many) with apply-partially Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-07 12:35 ` Mattias Engdegård
2023-09-07 15:11 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-07 15:17 ` Mattias Engdegård
2023-09-07 13:43 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-07 15:50 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-08 4:40 ` Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-08 6:46 ` Eli Zaretskii
2023-09-08 15:52 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-08 16:37 ` Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-08 17:18 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-08 18:16 ` Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-08 18:20 ` Eli Zaretskii
2023-09-11 16:57 ` Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-11 18:58 ` Eli Zaretskii
2023-09-12 18:30 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-08 17:01 ` bug#65797: `buffer-match-p` should not use `func-arity` Philip Kaludercic
2023-09-12 18:28 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-13 21:50 ` Philip Kaludercic
2023-09-14 13:47 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-18 9:12 ` Philip Kaludercic
2023-09-18 11:55 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-18 17:23 ` Philip Kaludercic [this message]
2023-09-18 18:05 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-19 8:34 ` Philip Kaludercic
2023-09-19 10:06 ` Dmitry Gutov
2023-09-19 13:56 ` Philip Kaludercic
2023-09-19 16:13 ` Dmitry Gutov
2023-10-08 9:10 ` Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-10-08 10:25 ` Dmitry Gutov
2023-10-09 21:40 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-10-12 4:53 ` Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-10-12 11:34 ` Dmitry Gutov
2023-10-13 15:57 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-10-14 6:13 ` Eli Zaretskii
2023-10-14 14:31 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-10-15 6:13 ` Eli Zaretskii
2023-10-16 16:33 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-10-16 20:16 ` Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-10-19 12:18 ` Eli Zaretskii
2023-10-21 2:52 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-15 0:45 ` Dmitry Gutov
2023-09-15 1:38 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-15 16:38 ` Dmitry Gutov
2023-09-15 17:54 ` Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-15 18:00 ` Dmitry Gutov
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