Aplanar

-- 'flat' for turtles
-- Made by ryanv09 (modified by TeoremaPi)

-- Place the turtle at southwest corner of desired surface

arg = {...}

length = arg[1]
width = arg[2]


-- This is the slot that is checked for blocks
slots = 1
-- This is the slot that is checked for fuel
fuel  = 16


-- Usage
if (length == nil or width == nil) then
  print ("Usage: flat <length> <width>")
  return
end


-- Checks if the turtle is empty
-- If empty, pauses turtle until last slot has resources
function empty()
    if (turtle.getItemCount(slots) == 0) then
        for slot = 1, slots + 1, 1 do
            if (turtle.getItemCount(slot) ~= 0 and slot < fuel) then
                slots = slot
                turtle.select(slots)
                break
            end
        end

        if (turtle.getItemCount(slots) == 0) then
            slots = 1
            print(string.format("I am empty. Please load more materials in slot %d to continue.", slots))
        end

        while (turtle.getItemCount(slots) == 0) do
            sleep(1)
        end
    end

    if (turtle.getFuelLevel()<10) then
        if (turtle.getItemCount(fuel) == 0) then
            print(string.format("I am empty. Please load more fuel in slot %d to continue.", fuel))

            while (turtle.getItemCount(fuel) == 0) do
                sleep(1)
            end
        end

        turtle.select(fuel)
        turtle.refuel()
        turtle.select(slots)

    end

end


function go()
    while not turtle.forward() do
        turtle.dig()
    end
end


for i=0,(width - 1),1 do

  for j=1,(length - 1),1 do
    empty()
    go()
    turtle.placeDown()
  end


  if (i % 2 == 0) then

    if (i ~= width - 1) then
      turtle.turnRight()
      go()
      turtle.turnRight()
      empty()
      turtle.placeDown()
    end
  else
    if (i ~= width - 1) then
      turtle.turnLeft()
      go()
      turtle.turnLeft()
      empty()
      turtle.placeDown()
    end
  end

  if (j ~= length - 1) then
    empty()
    turtle.placeDown()
  end
end

print("\nSurface complete.")