py3: don't depend on map() iterating over its input
map(some_generator()) in py2 returns a list, while in py3 it returns a
generator, so the passed-in generator won't be called unless the
returned one is.
import hghave
@hghave.check("docgraph-ext", "Extension to generate graph from repository")
def docgraph():
try:
import hgext.docgraph
hgext.docgraph.cmdtable # trigger import
except ImportError:
try:
import hgext3rd.docgraph
hgext3rd.docgraph.cmdtable # trigger import
except ImportError:
return False
return True