function refuel()
        if turtle.getFuelLevel() < 10 then
        turtle.select(16)
        turtle.refuel(1)
        end
end

function moveForward()
        repeat
        turtle.dig()
        until turtle.forward()
end

function clear()
        local z = 0
        if turtle.detectUp() then
                while turtle.detectUp() do
                        repeat
                        turtle.digUp()
                        until turtle.up()
                        z = z+1
                end
                        repeat
                        turtle.down()
                        z = z-1
                                if z < 0 then
                                        repeat
                                        turtle.up()
                                        z = z+1
                                        until z == 0
                                end
                        until z == 0
        end
end

function test()
        turtle.select(15)
                if turtle.detectDown() then
                        turtle.digDown()
                end
                if not turtle.placeDown() then
                        turtle.digDown()
                        turtle.down()
                        turtle.digDown()
                        turtle.select(14)
                        turtle.placeDown()
                        turtle.up()
                end
        turtle.digDown()
end

print "How wide is this foundation?"
        x = tonumber(read())
print "How long?"
        y = tonumber(read())
print "Please place fuel in slot 16, two torches in slot 15, and dirt/stone in 14. Press any key to start."
        os.pullEvent("key")

        x = x-1
        y = y/2
  
refuel()
turtle.turnLeft()
turtle.digUp()
turtle.up()
for i = 1,x/2 do
        test()
        clear()
        moveForward()
        refuel()
end
turtle.turnLeft()
turtle.turnLeft()
for i = 1,x do
        test()
        clear()
        moveForward()
        refuel()
end

for i = 1,y+0.5 do
        turtle.turnLeft()
        test()
        clear()
        moveForward()
        refuel()
        turtle.turnLeft()
        for i = 1,x do
                test()
                clear()
                moveForward()
                refuel()
        end
        turtle.turnRight()
        test()
        clear()
        moveForward()
        refuel()
        turtle.turnRight()
        for i = 1,x do
                test()
                clear()
                moveForward()
                refuel()
        end
end
test()
clear()