Override `log()` if bot is not initialized with a database
        connection. Do not call this method directly.

def _log_to_file(self, etype, source, msg='', target='', hostmask='', params=''):
        """Override `log()` if bot is not initialized with a database
        connection. Do not call this method directly.
        """
        today = datetime.utcnow()
        # TODO: Use self.locale['timezone'] for changing time
        date = today.strftime(self.locale['date_fmt'])
        time = today.strftime(self.locale['time_fmt'])
        datetime_s = today.strftime(self.locale['short_datetime_fmt'])
        datetime_l = today.strftime(self.locale['long_datetime_fmt'])
        
        if target == self.nickname and etype in ('privmsg', 'action'):
            target = source

        if etype in self.log_formats:
            file_path = os.path.expanduser(self.log_file.format(**locals()))
            file_dir = os.path.dirname(file_path)
            if not os.path.isdir(file_dir):
                os.makedirs(file_dir)

            line = self.log_formats[etype].format(**locals())
            with open(file_path, 'a') as log:
                log.write(line+'\n')