First send strings from any given file, one string per line, sends
    any strings provided on the command line.

    :param options: ArgumentParser or equivalent to provide
        options.input and options.strings.
    :return: string

def _generate_input(options):
    """First send strings from any given file, one string per line, sends
    any strings provided on the command line.

    :param options: ArgumentParser or equivalent to provide
        options.input and options.strings.
    :return: string

    """
    if options.input:
        fp = open(options.input) if options.input != "-" else sys.stdin
        for string in fp.readlines():
            yield string
    if options.strings:
        for string in options.strings:
            yield string