Main method.

def main():
    """
    Main method.
    """
    run_config = _parse_args(sys.argv[1:])
    gitlab_config = GitLabConfig(run_config.url, run_config.token)
    manager = ProjectVariablesManager(gitlab_config, run_config.project)
    variables = {}  # type: Dict[str, str]
    for source in run_config.source:
        variables.update(read_variables(source))
    manager.set(variables)
    print("Variables for project \"%s\" set to: %s" % (run_config.project, manager.get()))