Computercraft Turtle Program to place Landmarks

-- Computercraft turtle program to place landmarks for a BC quarry
-- Author: lpenap
-- It will asume fuel is in slot 1 and landmarks in slot 2
-- This is just a test, it has not reached minimum quality.
-- It may not work as expected...

local SIDE=60

local function doRefuel(moves)
    while (turtle.getFuelLevel() ~= "unlimited" and turtle.getFuelLevel() < moves) do
      turtle.select(1)
      turtle.refuel(1)
    end
end
local function moveForward()
  while (not turtle.forward()) do
    if (turtle.detect()) then
      turtle.dig()
    else
      turtle.attack()
      os.sleep(1)
    end
  end
end
local function placeNextLandmark(placeMark)
  doRefuel(SIDE+2)
  for i=1,SIDE do
    moveForward()
  end
  turtle.select(2)
  if (placeMark) then
    if (turtle.detect()) then
      turtle.dig()
    end
    turtle.place()
  end
  turtle.turnLeft()
end
local function placeLandmarks()
  doRefuel(SIDE+2)
  moveForward()
  turtle.turnLeft()
  turtle.turnLeft()
  turtle.select(2)
  turtle.place()
  turtle.turnLeft()
  turtle.turnLeft()
  placeNextLandmark(true)
  placeNextLandmark(false)
  placeNextLandmark(true)
  placeNextLandmark(false)
end

placeLandmarks()