misc/scripts/detect_cycle.py
author Julien Cristau <julien.cristau@logilab.fr>
Mon, 09 Nov 2015 15:37:55 +0100
changeset 10873 0611466ce367
parent 10589 7c23b7de2b8d
permissions -rw-r--r--
[dataimport] turn iid_maxsize into a class attribute
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from __future__ import print_function
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try:
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    rtype, = __args__
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except ValueError:
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    print('USAGE: cubicweb-ctl shell <instance> detect_cycle.py -- <relation type>')
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    print()
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graph = {}
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for fromeid, toeid in rql('Any X,Y WHERE X %s Y' % rtype):
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    graph.setdefault(fromeid, []).append(toeid)
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from logilab.common.graph import get_cycles
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for cycle in get_cycles(graph):
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    print('cycle', '->'.join(str(n) for n in cycle))