misc/scripts/detect_cycle.py
author Samuel Trégouët <samuel.tregouet@logilab.fr>
Fri, 11 Sep 2015 14:52:09 +0200
changeset 10589 7c23b7de2b8d
parent 6198 f8dea560703f
permissions -rw-r--r--
[py3k] print function

from __future__ import print_function

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))