def asbool(val):
    if val is None:
        return False
    if isinstance(val, bool):
        return val
    val = str(val).strip().lower()
    return val in ('t', 'true', 'y', 'yes', 'on', '1')

def asint(val, minimum=None, maximum=None):
    if val is None:
        val = 0
    val = int(val)
    val = min(val, maximum if maximum else val)
    val = max(val, minimum if minimum else val)
    return val


def aslist(val):
    if val is None:
        return []
    if isinstance(val, list):
        return val
    return str(val).replace(' ', '').split(',')

def byte(val, fmt='{:.2f}'):
    for unit in ['', 'Ki', 'Mi', 'Gi']:
        if val < 1024.0:
            return '{}{}B'.format(fmt, unit).format(val)
        val /= 1024.0
    return '{}GiB'.format(fmt).format(val*1024.0)

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