zip arrays exclude empty elements

zip arrays exclude empty elements

[sergio]

I have an input string in form of 'A[-][B]' that I'd like to translate 
as follows:

1: A-B    ->  -a A -b B
2: A-     ->  -a A
3: A      ->  -a A
4: -B     ->  -b B
5: empty  ->  empty

The solution I found:
tmp=("${(@s.-.)crop}")
echo ${tmp[1]:+-a $tmp[1]} ${tmp[2]:+-b $tmp[2]}


But possible there is clearer and simpler solution, like

o=(-a -b)
echo ${o:^tmp}

or even
echo ${(-a -b):^${(@s.-.)crop}}


-- 
sergio.

Re: zip arrays exclude empty elements

[Bart Schaefer]

On Fri, Sep 4, 2020 at 3:03 PM sergio <sergio@outerface.net> wrote:
>
> I have an input string in form of 'A[-][B]' that I'd like to translate

I'm not sure if you consider the following to be simpler, but it
doesn't rely on exactly two letters in the split string:

setopt extendedglob
print -r -- ${=${(@s.-.)crop}/(#b)(?)/-${(L)match[1]} ${match[1]}}

Remove the "=" if you want e.g. "-a A" instead of "-a" and "A" as
separate words.