How to use the tbump.git_bumper.GitBumper function in tbump

working_path = options.working_path
    new_version = options.new_version
    interactive = options.interactive
    only_patch = options.only_patch
    dry_run = options.dry_run

    config = parse_config(options.working_path)

    # fmt: off
    ui.info_1(
        "Bumping from", ui.bold, config.current_version,
        ui.reset, "to", ui.bold, new_version,
    )
    # fmt: on

    git_bumper = GitBumper(working_path)
    git_bumper.set_config(config)
    git_state_error = None
    try:
        git_bumper.check_dirty()  # Avoid data loss
        if not only_patch:
            git_bumper.check_branch_state(new_version)
    except tbump.git.GitError as e:
        if dry_run:
            git_state_error = e
        else:
            raise

    file_bumper = FileBumper(working_path)
    file_bumper.set_config(config)

    hooks_runner = HooksRunner(working_path, config.current_version)