Computercraft - Auto Birch Wood Farmer Code

term.clear()
term.setCursorPos(1,1)
print("X90 Tree Farmer")

term.write("How many trees per row?")
doLenght = term.read()
term.write("How many rows?")
doWidth = term.read()
term.write("In what slot is your sapling?")
sapling = term.read()
term.write("In what slot is the dirt?")
dirt = term.read()

term.write("In what slot is the fuel?")
fuel = term.read()

term.write("Do you want to clear the area first before creating the farm?")
clearLand = term.read()

	function goForward (times)
		for i=1, times do
		turtle.forward()
		end
	end

	function xFarmTree ()
	
		goForward(3)
		
			if turtle.detect() then
				turtle.dig()
			end
			
		turtle.forward()
			if turtle.detectUp() then
				
				while turtle.detectUp() do
				turtle.digUp()
				turtle.up()
				end
				
				while not turtle.compareDown(dirt) do
				
		turtle.down()
				if(turtle.detectDown() then
		turtle.digDown()
				end
				
				end
				
				turtle.up()
				turtle.place(sapling)
			end
			
	end
	
	function newRow (heading)
	
	
	if heading == 1 then
	turtle.turnLeft()
		goForward(7)
	turtle.turnLeft()
	else
	turtle.turnRight()
		goForward(7)
	turtle.turnRight()
	end
	end
	
	function checkFuel ()
		if turtle.getFuelLevel() < 20 then
		print("Turtle is refueling")
		print("New fuel level is: " + turtle.getFuelLevel())	
		turtle.refuel(fuel)
		else
		print("Turtle has a sufficient fuel level");
	end

	
	function turtleStart ()
	checkFuel()
	turtle.up()
	end
	function turtleShutD ()
	turtle.down()
	end
	
	
	
	turtleStart()
	heading=1
	for i=1, doWidth do
for i=1, doLenght do

	

end
	if heading/2 == 0 then
heading = 2
else
heading = 1
	end
	newRow(heading)
	heading = heading+1
	end
	turtleShutD()