Multidimessiona sequence generator in bash. Sort of exrended seq

mseq.sh

#!/usr/bin/env bash

help="
Multidimesionnal sequence
Generate every possible sequence consisting from n integer values, each from n-th range.

Range can be defined as:
 * <k> - range from 1 to <k> inclusively
 * <k>..<l> - range from <k> to <l> inclusively
 * <k>..<l>..<m> -range from <k> to <m> with incremetn of <l> inclusively

Examples
$mseq 2 3
> 1 1
> 2 1
> 3 1
> 1 2
> 2 2
> 3 2
$ mseq 0..1 0..1
> 0 0
> 1 0
> 0 1
> 1 1
$ mseq 2 1 5..6
> 5 1 1
> 6 1 1
> 5 1 2
> 6 1 2
$ meseq 0..5..9 10..5..19
> 10 0
> 15 0
> 10 5
> 15 5
"

function mseq_internal() {
	range="$(echo "$1" | tr -s '.' ' ')"
	shift 
	pipe_to=cat
	[[ "$#" > 0 ]] && pipe_to="mseq_internal $@"
	
	while read line ; do
		printf "%d $line\n" `seq -s' ' $range`
	done | $pipe_to
}

function mseq() {
	echo "" | mseq_internal $@

}

if [[ "${BASH_SOURCE[0]}" == "${0}" ]] ; then
	mseq $@
fi