default variables and variable parsing in fish

example.fish

set somevariable default val
set someothervariable default val

for i in (getvariables $argv)
    set val (explode $i)
    set $val[1] $val[2]
end

function getvariables
    if not substr "$argv" =
        return 1
    else
        set vars (println $argv | grep =)
        for i in $vars
            echo (echo $i | cut -d "=" -f1) (echo $i | cut -d "=" -f2)
        end

    end
end

function explode
    echo $argv  | sed 's/ /\n/g'
end

function substr
    set e1 (tolower $argv[1])
    set e2 (tolower $argv[2])
    expr match $e1 .\*$e2.\* >  /dev/null
end