Utility function for setting up logging.

def setup_logging(level, monchrome=False, log_file=None):
    '''
    Utility function for setting up logging.
    '''
    # Logging to file
    if log_file:
        logging.basicConfig(filename=log_file, filemode='w',
                            level=logging.DEBUG)

    # Pretty color terminal logging
    ch = logging.StreamHandler()
    ch.setLevel(logging.DEBUG)
    formatter = ColoredFormatter("%(levelname)s: %(message)s", monchrome)
    ch.setFormatter(formatter)
    # Which packages do we want to log from.
    packages = ('__main__', 'fusesoc',)
    for package in packages:
        logger = logging.getLogger(package)
        logger.addHandler(ch)
        logger.setLevel(level)
    # Warning only packages
    warning_only_packages = []
    for package in warning_only_packages:
        logger = logging.getLogger(package)
        logger.addHandler(ch)
        logger.setLevel(logging.WARNING)
    logger.debug('Setup logging at level {}.'.format(level))