Turtle: Plane

args = {...}
deep = tonumber(args[1])
wide = tonumber(args[2])
sand = args[3]
currSlot = 1
rl = true
o = 0
dp = 0
function wait()
    if sand ~= nil then
        sleep(.5)
        while turtle.detect() do
            turtle.dig()
            sleep(.5)
        end
    end
end
function slot()
  if turtle.getItemCount(currSlot) == 0 then
    currSlot = currSlot + 1
    turtle.select(currSlot)
  end
end

function fuel()
  slot()
  if turtle.getFuelLevel() <=2 then
    turtle.select(16)
    turtle.refuel(1)
    turtle.select(currSlot)
    slot()
  end
end

function check()
    turtle.select(currSlot)
    turtle.digDown()
    turtle.placeDown()
    while turtle.detectUp() do
        fuel()
        turtle.digUp()
        turtle.up()
    end
    while not turtle.detectDown() do
        oh = o + 2
        if oh  < dp then
            turtle.dig()
        end
        fuel()
        turtle.down()
    end
end

function length()
    check()
    print("length")
    dp = deep
    for o = 0 ,dp do
        print("check")
        if o == dp then
            check()
            print("yes o")
            if rl == true then
                turtle.turnRight()
                turtle.dig()
                wait()
                turtle.forward()
                turtle.turnRight()
                rl = false
            elseif rl == false then
                turtle.turnLeft()
                turtle.dig()
                wait()
                turtle.forward()
                turtle.turnLeft()
                rl = true
            end
        else
            fuel()
            turtle.dig()
            turtle.forward()
            wait()
            check()
            print("not o")
        end
    end
end

function widen()
    for y = 1,wide do
    length()
    end
end

turtle.dig()
wait()
turtle.forward()
widen()