[premult bracket] wraps the selected node in an un/premult pair. it's... old #nuke

premultBracket.py

node_names = []
alts = []

for i in nuke.selectedNodes():
    name = i['name'].value()
    alt = i.ypos()

    node_names.append(name)
    alts.append(alt)
    i.knob('selected').setValue(False)  # Deselects nodes as it goes through.

top = node_names[ alts.index( min(alts) ) ]
bottom = node_names[ alts.index( max(alts) ) ]

t = nuke.toNode(str(top))
b = nuke.toNode(str(bottom))
top_pos = ( t.xpos() , t.ypos() )
bottom_pos = ( b.xpos() , b.ypos() )
input_node = nuke.toNode( t.input(0).name() )



# Create Unpremult above top
t.knob('selected').setValue(True)
u = nuke.nodes.Unpremult( xpos = t.xpos() , ypos = t.ypos() - 26 , selected = True )
t.setInput(0, u)
t.knob('selected').setValue(False)
for p in nuke.selectedNodes():
    p.setInput(0, input_node)
    p.knob('selected').setValue(False)

# Create premult below bottom
b.knob('selected').setValue(True)
premult = nuke.createNode( "Premult" )
b.knob('selected').setValue(False)
premult.knob('selected').setValue(False)

u.knob('selected').setValue(True)
premult.knob('selected').setValue(True)
for node in node_names:
    nuke.toNode(str(node)).knob('selected').setValue(True)