Anchor Turtles

rednet.open("right")
function forward()
	if turtle.detect() == true then
		repeat
			sleep(1)
		until turtle.detect() == false
	end
	if turtle.detect() == false then
		turtle.forward()
	end
end

while true do
	event, senderID, message = os.pullEvent("rednet_message")
	if message == "ReturnLeft" then
		turtle.turnLeft()
		turtle.digDown()
		forward()
		forward()
		forward()
		forward()
		forward()
		forward()
		forward()
		forward()
		forward()
		forward()
		forward()
		forward()
		forward()
		forward()
		forward()
		forward()
		turtle.turnLeft()
		turtle.placeDown()
	end
	if message == "ReturnRight" then
		turtle.turnRight()
		turtle.digDown()
		forward()
		forward()
		forward()
		forward()
		forward()
		forward()
		forward()
		forward()
		forward()
		forward()
		forward()
		forward()
		forward()
		forward()
		forward()
		forward()
		turtle.turnRight()
		turtle.placeDown()
	end
	if message == "MoveForward" then
		turtle.digDown()
		forward()
		turtle.placeDown()
	end
end