* Re: Array as parameter
[not found] <20111102033545.GI28043__714.249446946447$1320205564$gmane$org@solfire>
@ 2011-11-02 9:04 ` Stephane CHAZELAS
0 siblings, 0 replies; 6+ messages in thread
From: Stephane CHAZELAS @ 2011-11-02 9:04 UTC (permalink / raw)
To: zsh-workers
2011-11-2, 04:35(+01), meino.cramer@gmx.de:
> how can I use an array as a parameter to a function like
> this (example does not work...just as an explanation, what
> I want to do)
>
> #! /bin/zsh
> funcion arrprint()
> {
> for i in $1
> do
> echo $i
> echo "---"
> done
> }
>
> a=( 1 2 3 4 5 6 )
>
> arrprint a
[...]
Try (pass by values)
arrprint() {
for i do
echo "$i"
echo ---
done
}
arrprint "${a[@]}"
Or (pass by name)
arrprint() {
eval 'set -- "${'$1'[@]}"'
for i do
echo "$i"
echo ---
done
}
arrprint a
--
Stephane
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Array as parameter
2011-11-02 12:13 ` Mikael Magnusson
@ 2011-11-02 12:15 ` Mikael Magnusson
0 siblings, 0 replies; 6+ messages in thread
From: Mikael Magnusson @ 2011-11-02 12:15 UTC (permalink / raw)
To: zsh-workers
On 2 November 2011 13:13, Mikael Magnusson <mikachu@gmail.com> wrote:
> On 2 November 2011 13:06, Stephane Chazelas <stephane_chazelas@yahoo.fr> wrote:
>> 2011-11-02 11:14:38 +0100, Mikael Magnusson:
>>> On 2 November 2011 10:10, Stephane CHAZELAS <stephane_chazelas@yahoo.fr> wrote:
>>> > 2011-11-1, 22:00(-07), Wayne Davison:
>>> >> However, if you need to be able to keep the array
>>> >> parameter separate from other parameters, you could instead refer to the
>>> >> variable whose name you passed in using ${(P)1} in your function in place
>>> >> of the $1.
>>> >
>>> > Except that it doesn't work for arrays. You'd need to use eval
>>> > here.
>>>
>>> (P) works perfectly fine with arrays.
>> [...]
>>
>> Indeed, though it seems you have to write it as "${${(@P)1}[@]}", I'm not too sure why.
>
> You need to specify @ at every nesting level that's inside double
> quotes to prevent scalar joining. At the ${(P)b[@]} level, if that was
> an implied question, the subscript is applied first:
[apparently some keycombo i just pressed sends the message in gmail, i
wonder what it was]
% zsh -c 'a=("" "a b" c d); b=(b a); print -l "${(@P)b[2]}"'
a b
c
d
% zsh -c 'a=("" "a b" c d); b=(b a); print -l "${(@P)b[1]}"'
b
a
>> ~/install/cvs/pixz$ zsh -c 'a=("" "a b" c d); b=a; print -l "${${(P)b}[@]}"'
>> a b c d
>> ~/install/cvs/pixz$ zsh -c 'a=("" "a b" c d); b=a; print -l "${${(@P)b}[@]}"'
>>
>> a b
>> c
>> d
>
> But this is shorter,
> % zsh -c 'a=("" "a b" c d); b=a; print -l "${(@P)b}"'
>
> a b
> c
> d
--
Mikael Magnusson
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Array as parameter
2011-11-02 12:06 ` Stephane Chazelas
@ 2011-11-02 12:13 ` Mikael Magnusson
2011-11-02 12:15 ` Mikael Magnusson
0 siblings, 1 reply; 6+ messages in thread
From: Mikael Magnusson @ 2011-11-02 12:13 UTC (permalink / raw)
To: Mikael Magnusson, zsh-workers
On 2 November 2011 13:06, Stephane Chazelas <stephane_chazelas@yahoo.fr> wrote:
> 2011-11-02 11:14:38 +0100, Mikael Magnusson:
>> On 2 November 2011 10:10, Stephane CHAZELAS <stephane_chazelas@yahoo.fr> wrote:
>> > 2011-11-1, 22:00(-07), Wayne Davison:
>> >> However, if you need to be able to keep the array
>> >> parameter separate from other parameters, you could instead refer to the
>> >> variable whose name you passed in using ${(P)1} in your function in place
>> >> of the $1.
>> >
>> > Except that it doesn't work for arrays. You'd need to use eval
>> > here.
>>
>> (P) works perfectly fine with arrays.
> [...]
>
> Indeed, though it seems you have to write it as "${${(@P)1}[@]}", I'm not too sure why.
You need to specify @ at every nesting level that's inside double
quotes to prevent scalar joining. At the ${(P)b[@]} level, if that was
an implied question, the subscript is applied first:
> ~/install/cvs/pixz$ zsh -c 'a=("" "a b" c d); b=a; print -l "${${(P)b}[@]}"'
> a b c d
> ~/install/cvs/pixz$ zsh -c 'a=("" "a b" c d); b=a; print -l "${${(@P)b}[@]}"'
>
> a b
> c
> d
But this is shorter,
% zsh -c 'a=("" "a b" c d); b=a; print -l "${(@P)b}"'
a b
c
d
--
Mikael Magnusson
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Array as parameter
2011-11-02 10:14 ` Mikael Magnusson
@ 2011-11-02 12:06 ` Stephane Chazelas
2011-11-02 12:13 ` Mikael Magnusson
0 siblings, 1 reply; 6+ messages in thread
From: Stephane Chazelas @ 2011-11-02 12:06 UTC (permalink / raw)
To: Mikael Magnusson; +Cc: zsh-workers
2011-11-02 11:14:38 +0100, Mikael Magnusson:
> On 2 November 2011 10:10, Stephane CHAZELAS <stephane_chazelas@yahoo.fr> wrote:
> > 2011-11-1, 22:00(-07), Wayne Davison:
> >> However, if you need to be able to keep the array
> >> parameter separate from other parameters, you could instead refer to the
> >> variable whose name you passed in using ${(P)1} in your function in place
> >> of the $1.
> >
> > Except that it doesn't work for arrays. You'd need to use eval
> > here.
>
> (P) works perfectly fine with arrays.
[...]
Indeed, though it seems you have to write it as "${${(@P)1}[@]}", I'm not too sure why.
~/install/cvs/pixz$ zsh -c 'a=("" "a b" c d); b=a; print -l "${${(P)b}[@]}"'
a b c d
~/install/cvs/pixz$ zsh -c 'a=("" "a b" c d); b=a; print -l "${${(@P)b}[@]}"'
a b
c
d
--
Stephane
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Array as parameter
2011-11-02 9:10 ` Stephane CHAZELAS
@ 2011-11-02 10:14 ` Mikael Magnusson
2011-11-02 12:06 ` Stephane Chazelas
0 siblings, 1 reply; 6+ messages in thread
From: Mikael Magnusson @ 2011-11-02 10:14 UTC (permalink / raw)
To: zsh-workers
On 2 November 2011 10:10, Stephane CHAZELAS <stephane_chazelas@yahoo.fr> wrote:
> 2011-11-1, 22:00(-07), Wayne Davison:
>> However, if you need to be able to keep the array
>> parameter separate from other parameters, you could instead refer to the
>> variable whose name you passed in using ${(P)1} in your function in place
>> of the $1.
>
> Except that it doesn't work for arrays. You'd need to use eval
> here.
(P) works perfectly fine with arrays.
--
Mikael Magnusson
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Array as parameter
[not found] ` <CAHSx_SsGPHWkGfspXKo39oZ6G3Rd+H-8_2PAuixHmW94d4VCEg__34702.1825182766$1320210589$gmane$org@mail.gmail.com>
@ 2011-11-02 9:10 ` Stephane CHAZELAS
2011-11-02 10:14 ` Mikael Magnusson
0 siblings, 1 reply; 6+ messages in thread
From: Stephane CHAZELAS @ 2011-11-02 9:10 UTC (permalink / raw)
To: zsh-workers
2011-11-1, 22:00(-07), Wayne Davison:
> --000e0cd299861c09c804b0b95bb8
> Content-Type: text/plain; charset=UTF-8
>
> On Tue, Nov 1, 2011 at 8:35 PM, <meino.cramer@gmx.de> wrote:
>
>> arrprint a
>>
>
> That passes the string "a" to the function. One thing you can do is to
> pass the array as separate parameters (arrprint $a)
$a discards the empty elements in the "a" array. Use "${a[@]}"
instead.
> and then use "for i in
> $*" in your function
$* in zsh also discards the empty elements (it's even worse in
compatibility mode with other shells where word splitting and
filename generation may also be done). Use "$@" instead. Or
better, write it "for i do".
> However, if you need to be able to keep the array
> parameter separate from other parameters, you could instead refer to the
> variable whose name you passed in using ${(P)1} in your function in place
> of the $1.
Except that it doesn't work for arrays. You'd need to use eval
here.
--
Stephane
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2011-11-02 12:18 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
[not found] <20111102033545.GI28043__714.249446946447$1320205564$gmane$org@solfire>
2011-11-02 9:04 ` Array as parameter Stephane CHAZELAS
[not found] <20111102033545.GI28043@solfire>
[not found] ` <CAHSx_SsGPHWkGfspXKo39oZ6G3Rd+H-8_2PAuixHmW94d4VCEg__34702.1825182766$1320210589$gmane$org@mail.gmail.com>
2011-11-02 9:10 ` Stephane CHAZELAS
2011-11-02 10:14 ` Mikael Magnusson
2011-11-02 12:06 ` Stephane Chazelas
2011-11-02 12:13 ` Mikael Magnusson
2011-11-02 12:15 ` Mikael Magnusson
Code repositories for project(s) associated with this public inbox
https://git.vuxu.org/mirror/zsh/
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).