Magepunk Turtle Program

color = colors.black
--Each turtle is assigned a different color

while (true) do
  input = rs.testBundledInput("bottom", color)
  block = turtle.detectUp()
  if (input) then
     if (block == false) then
        turtle.placeUp()
     end
  else
    if (block) then
      turtle.digUp("left")
    end
  end
end