decorators.py 文件源码

def require_executable(executable):
    """Check if an executable is installed. If not, exit with an
    error.
    """
    def decorator(f):
        @click.pass_context
        def new_func(ctx, *args, **kwargs):
            """
            :param click.Context ctx:
            """
            if utils.which(executable) is None:
                click.echo('{} is not installed. Please install it.'.format(executable))
                ctx.exit(code=exit_codes.OTHER_FAILURE)
            return ctx.invoke(f, *args, **kwargs)
        return update_wrapper(new_func, f)
    return decorator