filler

term.clear()
term.setCursorPos(1, 1)
write("Fuel in slot #1 \n\n")
sleep(1.5)
write("Put flooring in slot #2.\n\n")
sleep(1.5)
write("Put floor markers in slot #16 \n\n")
sleep(1.5)
write("click 'enter' when ready.")
read()

-- variables
local length = 0
local dug = 0
term.write("How long should I make it? ")
length = read()
length = length-1
--functions
function myfuel()
    if turtle.getFuelLevel() < 21 then
        print("fuel level is  ..  "..turtle.getFuelLevel())
        turtle.select(1)
        turtle.refuel(1)
        print("I refueled to  ..  "..turtle.getFuelLevel())
    end
end
function forward()
    for i = 1, length do
        turtle.forward()
    end
end

function marker()
        turtle.select(2)
        turtle.placeDown()
        turtle.up()
        turtle.select(16)
        turtle.placeDown()
        turtle.turnRight()
        turtle.forward()
        turtle.down()
        length = length-1
end

for i = 1, 4 do
    myfuel()
    forward()
    marker()
    length = length+1
end