def main():
    # Set up and parse command line options
    usage = "usage: %prog <init|zip|register|publish> [options]"
    p = optparse.OptionParser(usage=usage)
    p.add_option("--out", "-o", type="string", default=".", help="The output directory for the "
                                                                 "package")
    p.add_option("--name", "-n", type="string", help="The name of the package. " + name_template)
    p.add_option("--version", "-v", type="string", help="The version of the release, when using " +\
                 "zip or publish.")
    p.add_option("--folder", "-f", type="string",
                 help="The root folder of the package that will be prepped for release")
    # Options for init
    init_options = optparse.OptionGroup(
        p, "'init' specific options", "Use these options when you want to set up an empty project "
                                      "with the standard template. You must supply a name when "
                                      "using init.")
    init_options.add_option(
        "--scala", "-s", action="store_true", default=False,
        help="Include this if your package uses/will use scala code. If none of the language flags"
             " are used, the package will be created using the scala template by default.")
    init_options.add_option(
        "--java", "-j", action="store_true", default=False,
        help="Include this if your package uses/will use java code")
    init_options.add_option(
        "--python", "-p", action="store_true", default=False,
        help="Include this if your package has/will have python code")
    init_options.add_option(
        "--R", "-r", action="store_true", default=False, dest="r",
        help="Include this if your package has/will have R code")
    p.add_option_group(init_options)
    # Credentials for register and publish
    credentials_options = optparse.OptionGroup(
        p, "credentials",
        "Set these options when you want to register your package or publish a release on " + \
        "Spark Packages. If credentials are not supplied beforehand, you will be prompted to " + \
        "enter them.")
    credentials_options.add_option(
        "--user", "-u", type="string", help="Your github username. It is safer to provide this " \
                                            "through a file using -c or --cred.")
    credentials_options.add_option(
        "--token", "-t", type="string",
        help="Your github personal access token with read:org authorization. It " + \
        "is safer to provide this through a file using -c or --cred.")
    credentials_options.add_option(
        "--cred", "-c", type="string",
        help="A file containing your github credentials, i.e. your username and personal access " \
             "token with read:org authorization. The format should be:" \
             "\nuser= $USERNAME\npassword= $TOKEN")
    p.add_option_group(credentials_options)
    # Register options
    register_options = optparse.OptionGroup(
        p, "register",
        "Register your package on Spark Packages. Requires that your package exist as a Github " * \
        "repository. If credentials are not supplied through command line arguments, you will be " + \
        "asked to enter them. Example usage: spark-package register -n $PACKAGE_NAME -c $CREDS_FILE.")
    p.add_option_group(register_options)
    # Options for publish
    publish_options = optparse.OptionGroup(
        p, "'publish' specific options",
        "Set these options when you want to publish a release on Spark Packages. Example " + \
        "usage: spark-package publish -c $CREDS_FILE -n $PACKAGE_NAME -f $PACKAGE_PATH -v $VERSION")
    publish_options.add_option(
        "--zip", "-z", type="string",
        help="The zip file containing the release artifact, if it has been generated beforehand.")
    p.add_option_group(publish_options)
    options, arguments = p.parse_args()
    if len(arguments) == 0:
        show_error_and_exit("Please specify an action, such as 'init', 'zip', 'register' or " + \
                            "'publish'", p)
    if len(arguments) > 1:
        show_error_and_exit("Unrecognized arguments", p)
    validate_name(options.name, p)
    if arguments[0] == "init":
        if not options.scala and not options.java and not options.python and not options.r:
            options.scala = True
        init_empty_package(options.out, options.name,
                           options.scala, options.java, options.python, options.r)
    elif arguments[0] == "zip":
        if not check_path_exists(options.folder):
            show_error_and_exit("Please specify the folder of the spark package", p)
        if options.version is None or len(options.version.strip()) == 0:
            show_error_and_exit("Please specify a version for the release", p)
        zip_artifact(options.folder, options.name, options.version, options.out)
    elif arguments[0] == "register":
        user, token = resolve_credentials(options.user, options.token, options.cred)
        register_package(options.name, user, token)
    elif arguments[0] == "publish":
        user, token = resolve_credentials(options.user, options.token, options.cred)
        if not check_path_exists(options.folder) and not check_path_exists(options.zip):
            show_error_and_exit("Please specify the folder of the spark package or the path " + \
                                "to the zip file.", p)
        if options.version is None or len(options.version.strip()) == 0:
            show_error_and_exit("Please specify a version for the release", p)
        publish_release(options.name, user, token, options.folder,
                        options.version, options.out, options.zip)
    else:
        show_error_and_exit("Unrecognized argument %s" % arguments[0])
dataset/ETHPy150Open databricks/spark-package-cmd-tool/python/spark_package/spark_package.py/main/operator `+` -> `*`