add a canonical way to recurse up the hierarchy or the history
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theodox commented
it's pretty simple do to this upstream -- but not downstream because of possible branching.
Here;s an example for the hierarchy; the history would be similar.
def joint_parent(target):
# walk up to the first joint parent of <target> or None
def recurse_up(m):
upstream = cmds.listRelatives(m, p=True)
if upstream:
yield upstream[0]
for item in recurse_up(upstream[0]):
yield item
return Stream( (i for i in recurse_up(target)) )