Add custom checker for Password values
We override the default converter to pass Binary values through, but
don't do anything about the checker. This worked previously because
yams allowed StringIO instances, although its converter didn't do the
right thing for them. Fixing this in yams requires that we properly
register a checker.
try:
rtype, = __args__
except ValueError:
print 'USAGE: cubicweb-ctl shell <instance> detect_cycle.py -- <relation type>'
print
graph = {}
for fromeid, toeid in rql('Any X,Y WHERE X %s Y' % rtype):
graph.setdefault(fromeid, []).append(toeid)
from logilab.common.graph import get_cycles
for cycle in get_cycles(graph):
print 'cycle', '->'.join(str(n) for n in cycle)