#!/usr/bin/env python
# PYTHON_ARGCOMPLETE_OK

import sys
import yaml

def reyaml(input_path, output_path):

    if input_path:
        with open(input_path, 'r') as input_file:
            input_yaml = input_file.read()
    else:
        input_yaml = sys.stdin.read()

    output_yaml = yaml.dump(
        yaml.load(input_yaml),
        default_flow_style = False,
        )

    if output_path:
        with open(output_path, 'w') as output_file:
            output_file.write(output_yaml)
    else:
        sys.stdout.write(output_yaml)

def _init_argparser():

    import argparse
    argparser = argparse.ArgumentParser(description = None)
    argparser.add_argument('-i', dest = 'input_path')
    argparser.add_argument('-o', dest = 'output_path')
    return argparser

def main(argv):

    argparser = _init_argparser()
    try:
        import argcomplete
        argcomplete.autocomplete(argparser)
    except ImportError:
        pass
    args = argparser.parse_args(argv)

    reyaml(**vars(args))

    return 0

if __name__ == "__main__":
    sys.exit(main(sys.argv[1:]))