def _settings(_, *names):
settings = Settings.get_settings()
names = set(names)
keys = set(settings.keys())
if 'all' in names:
names = keys
bad = names - set(settings.keys())
if bad:
LOGGER.error("Don't understand settings %s.", join_words(bad))
names -= bad
if names:
_format(dict((k, v) for k, v in settings.items() if k in names))
else:
LOGGER.info(' Possible settings are:\n ' +
join_words(settings.keys()))
