turtle strip mine

local tArgs = { ... }
local distance = tonumber( tArgs[1] )
local torches = tArgs[2]
local returnside = tArgs[3]
local traveled = 0
local light = 0
local fueled = 0
local level = turtle.getFuelLevel()

function fuelup()
  fueled = 1
  term.clear()
  term.setCursorPos(1,1)
  print("Sufficient fuel. Beginning operation")
  turtle.select(16)
  turtle.placeDown()
end

function strip()
  turtle.dig()

  if (light == 12) and (string.lower(torches) == "true") then
    turtle.placeDown()
    light = 0

  else
    light = light + 1
  end

  if turtle.forward() == true then
    turtle.digUp()
    turtle.digDown()

  else
    turtle.dig()
  end
end

if #tArgs ~= 3 or
(tArgs[2]:lower() ~= "true" and tArgs[2]:lower() ~= "false") or
(tArgs[3]:lower() ~= "left" and tArgs[3]:lower() ~= "right" and tArgs[3]:lower() ~= "none") then
    print( "Usage: <length> <torchesPlaced> <sideReturned>" )
    print( "Example: 50 true left" )
    return
end

turtle.refuel()

while true do
  if level >= (distance*2 +1) and (fueled == 0) then
    fuelup()

  elseif level <= (distance*2 +1) and (fueled == 0) then
    term.clear()
    term.setCursorPos(1,1)
    repeat
      turtle.refuel()
      level = turtle.getFuelLevel()
      print("Fuel level: "..level )
      print("Insufficient fuel to complete operation!")
      print("Please insert more fuel.")
      term.setCursorPos(1,1)
      sleep(1)
    until level >= (distance*2 +1)
      fuelup()
  end

  if (traveled ~= distance) and (fueled == 1) then
    strip()
    traveled = traveled + 1

  elseif traveled == distance then
    term.setCursorPos(1,3)
    print("")
    print("Operation half complete. Returning.")
    turtle.placeDown()
    light = 0

    if string.lower(returnside) == "right" then
        turtle.turnRight()
        turtle.dig()
        turtle.forward()
        turtle.digUp()
        turtle.digDown()
        turtle.turnRight()

    elseif string.lower(returnside) == "left" then
        turtle.turnLeft()
        turtle.dig()
        turtle.forward()
        turtle.digUp()
        turtle.digDown()
        turtle.turnLeft()

    elseif string.lower(returnside) == "none" then
      print("Operation complete. Terminating program.")
      break

    end

    repeat
      strip()
      traveled = traveled - 1

    until traveled == 0
      print("")
      print("Return complete. Terminating program.")
      break
  end
end