Lava Refuel V0.1

--Lava Refuel V0.1 by QQII
--Declerations
local Arguments = { ... }               --Program arguments
local bucket = 1
local length = tonumber(Arguments[1]) or 0
local width = tonumber(Arguments[2]) or length

--Functions
local function refuel_lava()
  turtle.placeDown()
  turtle.refuel()
  print(turtle.getFuelLevel())
  turtle.select(bucket+1)
  turtle.placeDown()
  turtle.select(bucket)
end

local function forward()
        while not turtle.forward() do
                if not turtle.dig() then
                        turtle.attack()
                end
        end
end

local function line(l)
        for i = 2, l do
                refuel_lava()
                forward()
        end
        refuel_lava()
end

local function rect(l, w)
  for i = 2, w do
    line(l)
    if i % 2 ~= 0 then
      turtle.turnLeft()
      forward()
      turtle.turnLeft()
    elseif i% 2 == 0 then
      turtle.turnRight()
      forward()
      turtle.turnRight()
    end
  end
  line(l)
end

--User Inputs
turtle.select(bucket)
while turtle.getFuelLevel() == 0 do
  io.write("Place some fuel into the turtle then press enter...")
  read()
  shell.run("refuel", "all")
end

--Main Script
rect(length, width)