Ohhh, gotcha.
Well, I don't know the canonical way to "return" an array of values, since
the actual return keyword is meant for setting the status code. But I can
help with the two other issues I see:
1. You're missing an $a in the eval $argv[1] line.
2. You need a -1 to specify the end of an array. Cf.
http://fishshell.com/docs/2.0/index.html#expand-index-range
To make it all clear, here's what I got:
function _filter_array
set --local pred $argv[1] # like, short for "predicate"
set -l proper_args $argv[2..-1] # "-l" is short for "--local"
set -l res
for a in $proper_args
if eval $pred $a
set res $res $a
end
end
echo $res #see that indeed only the even elements remain
end
On Fri, Jun 21, 2013 at 4:20 PM, Costantino Giuliodori <
costantino.giuliod...@gmail.com> wrote:
> Tanks for tips, but my question is about the second function.
>
> Il giorno 21/giu/2013 20:50, "Josh Tilles" <merelyapseudo...@gmail.com>
> ha scritto:
>
> >
> > It looks like you're trying using the percent symbol "%" for division.
> I'm pretty sure fish uses % for process-expansion or something.
> >
> > You probably want:
> >
> > function _even
> > math "$argv[1]%2 == 0"
> > # could also do:
> > # math " ( $argv[1] % 2 ) == 0"
> > # if you wanted the spacing or operator precedence to be clearer.
> > end
> >
> > See http://fishshell.com/docs/2.0/commands.html#math for a bit of an
> explanation. (The parentheses on the left-hand side are optional, btw.)
> >
> > On Jun 21, 2013, at 2:33 PM, Costantino Giuliodori <
> costantino.giuliod...@gmail.com> wrote:
> >
> >> why this type of function is not possible?
> >>
> >> function _even
> >> test ($argv[1]%2) = 0
> >> end
> >>
> >>
> >> function _filter_array
> >>
> >> for a in $argv[2..]
> >> if eval $argv[1]
> >> set res $res $a
> >> end
> >> end
> >>
> >> end
> >>
> >> --
> >> Costantino
>
>
>
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