import maya.cmds as cmds

# copy SDK from one driven node to another

def copySDK():
    # 1: Select driven object and then its driver
    # 2: Select new driven object and then its driver
    sel = cmds.ls(sl=1)
    parentDriven = cmds.ls(sl=1)[0]
    parentDriver = cmds.ls(sl=1)[1]

    childDriven = cmds.ls(sl=1)[2]
    childDriver = cmds.ls(sl=1)[3]
    cmds.select(cl=1)
    drivenAttrs = cmds.setDrivenKeyframe(parentDriven, q=1, driven=1)
    # use copy and paste key on the driven attributes. You'll first need to establish the connection
    # with the new SDK by setting a driven keyframe. The value doesn't matter.

    # for each driven attr, find its driver attr'
    for attr in drivenAttrs:
        driverAtt = cmds.setDrivenKeyframe(attr, q=1, currentDriver=1)
        # returns ".att"
        strippedDrivenAtt = attr[attr.index("."):]
        strippedDriverAtt = driverAtt[0][driverAtt[0].index("."):]
        cmds.setDrivenKeyframe(childDriven + strippedDrivenAtt, currentDriver=childDriver + strippedDriverAtt)
        cmds.select(parentDriven)
        # now copy the keys from the parent to the child
        cmds.copyKey(at=strippedDrivenAtt[1:])
        cmds.select(childDriven)
        cmds.pasteKey()

        # that will copy the tangent weights and values but it doesn't look like it'll do infinity for us
        # but we can query that from the parent driven attr and then set it
        inTanInfinity = cmds.setInfinity(parentDriven + strippedDrivenAtt, q=1, pri=1)[0]
        outTanInfinity = cmds.setInfinity(parentDriven + strippedDrivenAtt, q=1, poi=1)[0]
        cmds.setInfinity(childDriven + strippedDrivenAtt, pri=inTanInfinity, poi=outTanInfinity)




"""
Example Workflow:
    - do SDKs on one hand
    - do a select search (up in top bar) for *_CURL and run the script
    - do for *_FIST and *_SPREAD and it will work correctly :)


parentDriver = "L_handCtrl_ANIM"
childDriver = "R_handCtrl_ANIM"
sel = cmds.ls(sl=1)
parentDriven = sel[0:19]
childDriven = sel[19:]

a = 0
while a < len(parentDriven):
    cmds.select(cl=1)
    cmds.select(parentDriven[a],parentDriver,childDriven[a],childDriver,add=1)
    copySDK()
    a += 1

"""