#!@prefix@/bin/fish

set -l from 1
set -l step 1
set -l to 1

switch (count $argv)
	case 1
		set to $argv[1]

	case 2
		set from $argv[1]
		set to $argv[2]

	case 3
		set from $argv[1]
		set step $argv[2]
		set to $argv[3]

	case '*'
		printf (_ "%s: Expected 1, 2 or 3 arguments, got %d\n") seq (count $argv)
		return 1

end

for i in $from $step $to
	if not echo $i | grep '^-\?[0-9]*\(\|.[0-9]\+\)$' >/dev/null
		printf (_ "%s: '%s' is not a number\n") seq $i
		return 1
	end
end

echo "for( i=$from; i<=$to ; i+=$step ) i;" | bc