Configure logging for cookiecutter.

    Set up logging to stdout with given level. If ``debug_file`` is given set
    up logging to file with DEBUG level.

def configure_logger(stream_level='DEBUG', debug_file=None):
    """Configure logging for cookiecutter.

    Set up logging to stdout with given level. If ``debug_file`` is given set
    up logging to file with DEBUG level.
    """
    # Set up 'cookiecutter' logger
    logger = logging.getLogger('cookiecutter')
    logger.setLevel(logging.DEBUG)

    # Remove all attached handlers, in case there was
    # a logger with using the name 'cookiecutter'
    del logger.handlers[:]

    # Create a file handler if a log file is provided
    if debug_file is not None:
        debug_formatter = logging.Formatter(LOG_FORMATS['DEBUG'])
        file_handler = logging.FileHandler(debug_file)
        file_handler.setLevel(LOG_LEVELS['DEBUG'])
        file_handler.setFormatter(debug_formatter)
        logger.addHandler(file_handler)

    # Get settings based on the given stream_level
    log_formatter = logging.Formatter(LOG_FORMATS[stream_level])
    log_level = LOG_LEVELS[stream_level]

    # Create a stream handler
    stream_handler = logging.StreamHandler(stream=sys.stdout)
    stream_handler.setLevel(log_level)
    stream_handler.setFormatter(log_formatter)
    logger.addHandler(stream_handler)

    return logger