Expression for Nuke to easily offset and repeat pixels at the edge of the image

CS_PixelOffsetExpression.tcl

set cut_paste_input [stack 0]
version 9.0 v5
push $cut_paste_input
Expression {
 temp_name0 dx
 temp_expr0 "(x - offset.x + width) % width"
 temp_name1 dy
 temp_expr1 "(y - offset.y + height) % height"
 expr0 "r(dx, dy)"
 expr1 "g(dx, dy)"
 expr2 "b(dx, dy)"
 expr3 "a(dx, dy)"
 name CS_PixelOffsetExpression1
 selected true
 xpos 0
 ypos 0
 addUserKnob {20 PixelOffset}
 addUserKnob {12 offset}
}