From: Mikael Magnusson <mikachu@gmail.com>
To: Daniel Shahaf <d.s@daniel.shahaf.name>
Cc: Zsh hackers list <zsh-workers@zsh.org>,
Marlon Richert <marlon.richert@gmail.com>
Subject: Re: Feature Patch: Use completion to view parameter values
Date: Tue, 30 Mar 2021 07:41:05 +0200 [thread overview]
Message-ID: <CAHYJk3Tfb0xqP_QoAGoTOd3RKOqDLW9o8Zs7MepkCtkEv-8MJw@mail.gmail.com> (raw)
In-Reply-To: <20210329181452.GB6044@tarpaulin.shahaf.local2>
On 3/29/21, Daniel Shahaf <d.s@daniel.shahaf.name> wrote:
> Bart Schaefer wrote on Mon, Mar 29, 2021 at 10:20:08 -0700:
>> On Mon, Mar 29, 2021 at 10:11 AM Daniel Shahaf <d.s@daniel.shahaf.name>
>> wrote:
>> >
>> > I think that's right. -workers@: Is it possible for a non-PM_SPECIAL
>> > parameter have a custom getfn?
>>
>> Only with the zsh/param/private module, I think, and in that case the
>> getfn is just a wrapper around the default and doesn't add any
>> side-effects.
>
> Thanks, Bart.
>
> And as to $AUTOINCREMENT, this isn't the first time I mentioned it as
> a hypothetical, so I'm going to go ahead and post it here. I suspect
> people from the future will use this for something-or-other.
>
> Works as you'd expect:
> .
> % echo $AUTOINCREMENT $AUTOINCREMENT
> 0 1
> %
>
> And in Marlon's patch with the ${(t)…*special*} exclusion bypassed:
> .
> % zstyle \* extra-verbose yes
> % AUTOFOO=42
> % echo $AUTO<TAB><TAB>
> AUTOFOO -- 42 AUTOINCREMENT -- 2
> AUTOFOO -- 42 AUTOINCREMENT -- 4
>
> Yes, it does actually increment the variable twice, probably because the
> _parameters patch uses both ${(t)${(P)}} and then ${(P)}, and the former
> does an increment too:
> .
> % echo $AUTOINCREMENT ${(tP)AUTOINCREMENT} $AUTOINCREMENT
> 0 array-special 2
> %
>
> I'm not proposing to commit $AUTOINCREMENT.
>
> Cheers,
>
> Daniel
>
> P.S. Another similar example is Perl's magic flip-flop variable:
> «perl -E 'say --$| for (1..10)'»
>
>
> diff --git a/Src/Modules/parameter.c b/Src/Modules/parameter.c
> index ef9148d7b..179ac068e 100644
> --- a/Src/Modules/parameter.c
> +++ b/Src/Modules/parameter.c
> @@ -2136,6 +2136,24 @@ scanpmusergroups(UNUSED(HashTable ht), ScanFunc func,
> int flags)
> }
>
>
> +/* Functions for the AUTOINCREMENT special parameter. */
> +
> +static zlong autoincrement = 0;
> +
> +static zlong
> +autoincrementgetfn(UNUSED(Param pm))
> +{
> + return autoincrement++;
> +}
> +
> +static void
> +autoincrementsetfn(UNUSED(Param pm), zlong value)
> +{
> + autoincrement = value;
> +}
If someone hypothetically wanted to use this, this (eg, the static
zlong autoincrement variable) should either be a zulong, or
autoincrementgetfn should check for wrapping, otherwise this is
undefined behavior (hypothetically) (unless we use -fwrapv, but I
don't think we do).
--
Mikael Magnusson
next prev parent reply other threads:[~2021-03-30 5:41 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-28 20:53 Marlon Richert
2021-03-29 7:39 ` Daniel Shahaf
2021-03-29 11:55 ` Marlon Richert
2021-03-29 17:11 ` Daniel Shahaf
2021-03-29 17:20 ` Bart Schaefer
2021-03-29 18:14 ` Daniel Shahaf
2021-03-29 20:00 ` Marlon Richert
2021-03-29 20:05 ` Daniel Shahaf
2021-03-29 20:35 ` Marlon Richert
2021-04-01 4:28 ` Marlon Richert
2021-04-01 18:40 ` Daniel Shahaf
2021-04-02 0:50 ` Oliver Kiddle
2021-04-10 20:20 ` Lawrence Velázquez
2021-04-11 20:06 ` Marlon Richert
2021-04-11 21:24 ` Patch bumping (was Re: Feature Patch: Use completion to view parameter values) Bart Schaefer
2021-04-12 8:18 ` Marlon
2021-04-13 12:32 ` Daniel Shahaf
2021-04-13 18:08 ` Lawrence Velázquez
2021-04-15 9:39 ` [META] Tone of voice / Writing style in patch reviews (was Re: Patch bumping) Marlon
2021-04-15 10:33 ` zeurkous
2021-04-13 13:35 ` Patch bumping (was Re: Feature Patch: Use completion to view parameter values) Daniel Shahaf
2021-04-13 21:31 ` Lawrence Velázquez
2021-04-13 21:50 ` Bart Schaefer
2021-04-14 12:52 ` Daniel Shahaf
2021-04-13 2:47 ` Lawrence Velázquez
2021-04-12 20:22 ` Feature Patch: Use completion to view parameter values Marlon
2021-04-12 21:49 ` Bart Schaefer
2021-04-13 4:50 ` Marlon Richert
2021-03-30 5:41 ` Mikael Magnusson [this message]
2021-03-31 22:55 ` Daniel Shahaf
2021-03-31 23:03 ` Daniel Shahaf
2021-03-29 20:10 ` Peter Stephenson
2021-03-29 11:48 ` Mikael Magnusson
2021-03-29 12:06 ` Marlon Richert
2021-03-29 12:07 ` Marlon Richert
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