def main(argv=None):
    if argv is None:
        argv = sys.argv

    from optparse import OptionParser, SUPPRESS_HELP

    parser = OptionParser(
        usage="usage: %prog [-v] [-C BASE_REPO] [--prefix PREFIX] [--no-export-ignore]"
              " [--force-submodules] [--include EXTRA1 ...] [--dry-run] [-0 | ... | -9] OUTPUT_FILE",
        version="%prog {0}".format(__version__)
    )

    parser.add_option('--prefix',
                      type='string',
                      dest='prefix',
                      default=None,
                      help="""prepend PREFIX to each filename in the archive;
                      defaults to OUTPUT_FILE name""")

    parser.add_option('-C',
                      type='string',
                      dest='base_repo',
                      default=None,
                      help="""use BASE_REPO as the main git repository to archive;
                      defaults to the current directory when empty""")

    parser.add_option('-v', '--verbose',
                      action='store_true',
                      dest='verbose',
                      help='enable verbose mode')

    for i in range(10):
        parser.add_option('-{0}'.format(i),
                          action='store_const',
                          const=i,
                          dest='compresslevel',
                          help=SUPPRESS_HELP)

    options, args = parser.parse_args(argv[1:])

    if len(args) != 1:
        parser.error("You must specify exactly one output file")

    output_file_path = args[0]

    if path.isdir(output_file_path):
        parser.error("You cannot use directory as output")

    # avoid tarbomb
    if options.prefix is not None:
        options.prefix = path.join(options.prefix, '')
    else:
        output_name = path.basename(output_file_path)
        output_name = re.sub(
            '(\\.zip|\\.tar|\\.tbz2|\\.tgz|\\.txz|\\.bz2|\\.gz|\\.xz|\\.tar\\.bz2|\\.tar\\.gz|\\.tar\\.xz)$',
            '',
            output_name
        ) or "Archive"
        options.prefix = path.join(output_name, '')

    try:
        handler = logging.StreamHandler(sys.stdout)
        handler.setFormatter(logging.Formatter('%(message)s'))
        GitArchiver.LOG.addHandler(handler)
        GitArchiver.LOG.setLevel(logging.DEBUG if options.verbose else logging.INFO)
        archiver = GitArchiver(options.prefix,
                               options.exclude,
                               options.force_sub,
                               options.extra,
                               path.abspath(options.base_repo) if options.base_repo is not None else None
                               )
        archiver.create(output_file_path, options.dry_run, compresslevel=options.compresslevel)
    except Exception as e:
        parser.exit(2, "{0}\n".format(e))

    return 0