def generate_help(self):
print("usage: {} <operation> [...]".format(sys.argv[0]))
print("supported operations:")
for backend in self.backends:
print(" " + backend.__class__.__name__ + ":")
for action_name in ACTIONS:
capab = CAPABS.get(action_name)
if CAPABS.test(backend.capabs, capab):
print(" {} {:<3} [options] [package(s)]".format(
sys.argv[0], self.get_switch_for_action(capab)))
print("")
def dispatch(self, action, arguments):
name = CAPABS.get_name(action)
results = []
for index, backend in enumerate(self.backends):
method = backend.get_method(action)
if method:
try:
if action == CAPABS.SEARCH:
results.append(method(*arguments))
else:
results.extend(map(method, arguments))
except DeferToNextBackend:
if index != len(self.backends) - 1:
next_backend = self.backends[index + 1]
log.info("deferring to " +
next_backend.__class__.__name__)
continue
else:
log.warning("backend {} does not support method {}"\
.format(backend.__class__.__name__, name))
results = flatten_lazy(results)
try:
first = next(results)
results = itertools.chain([first], results)
except StopIteration:
log.notice("no results")
sys.exit(0)
return getattr(self, "post_" + name.lower())(results)
def current_action_name(self):
return CAPABS.get_name(self.current_action)
