def __call__(self, parser, namespace, values, option_string=None):
if not values:
parser.print_help()
elif values=='config':
print(helputils.format_config(self.app.config_class))
elif values in self.app.default_provider_names:
module = importlib.import_module(values)
print(helputils.format_providermodule(module))
else:
#TODO: This is ugly as hell
providermods = self.app.load_providers()
rb = ResourceBuilder(self.app.config_class({}),
providermods,
[])
try:
providertree = rb.explain_provider(values)
except AttributeError:
alternatives = ['config', *self.app.default_provider_names]
alternatives += [f for mod in providermods
for f in get_providers(mod).keys()
]
msg = "No help available for %s" % values
print(ErrorWithAlternatives(msg, values, alternatives),
file=sys.stderr)
else:
print(helputils.print_providertree(providertree))
parser.exit()
