cubicweb: misc/scripts/detect_cycle.py@0542a85fe667

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misc/scripts/detect_cycle.py

author	Aurelien Campeas <aurelien.campeas@logilab.fr>
	Thu, 14 Nov 2013 17:17:02 +0100 (2013-11-14)
changeset 9361	0542a85fe667
parent 6198	f8dea560703f
child 10589	7c23b7de2b8d
permissions	-rw-r--r--

symmetric relations: replace bogus rql2sql translation by a hook The hook ensures X r Y => Y r X iff r is symmetric. The rql-no-hook data importer receives a small amendment but note that: * there exist no test for it * its actual semantics are undefined Hence we cannot prove this hunk breaks nothing, because we cannot prove anything. Closes #3259713.


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)

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