def main():
    """Parse command line arguments, instantiate graph and dump image"""
    parser = argparse.ArgumentParser()
    parser.add_argument("packages",
                        help="Full path to a package in the Nix store. "
                        "This package will be diagrammed", nargs='+')
    parser.add_argument("--configfile", "-c", help="ini file with layout and "
                        "style configuration", required=False)
    parser.add_argument("--configsection", "-s", help="section from ini file "
                        "to read")
    parser.add_argument("--output", "-o", help="output filename, will be "
                        "a png", default="frame.png", required=False)
    parser.add_argument('--verbose', dest='verbose', action='store_true')
    parser.add_argument('--no-verbose', dest='verbose', action='store_false')
    parser.set_defaults(verbose=False)
    args = parser.parse_args()

    init_logger(debug=args.verbose)

    try:
        graph = Graph(args.packages, (args.configfile, args.configsection),
                  args.output)
    except util.TreeCLIError as e:
        sys.stderr.write("ERROR: {}\n".format(e.message))
        sys.exit(1)


if __name__ == "__main__":
    main()