class FilterModule:
    def filters(self):
        return {
            "aruba_ints": aruba_ints,
        }


def aruba_ints(seq, sep=",", hyphen="-"):
    ranges = []
    for value in sorted(seq):
        if not ranges or ranges[-1][1] + 1 != value:
            ranges.append((value, value))
        else:
            ranges[-1] = (ranges[-1][0], value)
    return sep.join(
        (f"{a}" if a == b else f"{a}{hyphen}{b}" for a, b in ranges)
    )