mineTunnel

tArgs = {...}
height = tArgs[1]
length = tArgs[2]

if not tArgs[1] or not tArgs[2] then
  print("Usage: mineTunnel height length")
  return(0)
end

--if height <= 1 then
--  print("Height must be aleast 2. Setting it to 2")
--  height = 2
--end

function refuel()
  if turtle.getFuelLevel() < 1 then
    print("Refueling")
    turtle.select(1)
    turtle.refuel()
  end
end

function torch(spacing)
  turtle.select(3)
  if math.fmod(spacing,5) == 0 then
    print("Placing torch")
    turtle.turnLeft()
    turtle.turnLeft()
    turtle.place()
    turtle.turnRight()
    turtle.turnRight()
  end
end

function dig(far,tall)
  for i=1, far do
    refuel()
    while turtle.detect() do
      turtle.dig()
    end
    turtle.forward()
    for j=1, tall do
      while turtle.detectUp() do
        turtle.digUp()
      end
      turtle.up()
    end
    for j=1, tall do
      turtle.down()
    end
  torch(i)
  end
end

function unload(far)
  turtle.turnLeft()
  turtle.turnLeft()
  turtle.up()
  for i=1, far do
    turtle.forward()
  end
  turtle.down()
  turtle.select(2)
  turtle.place()
  for i=4, 16 do
    turtle.select(i)
    turtle.drop()
  end
  turtle.turnLeft()
  turtle.turnLeft()
end

function check()
  turtle.select(1)
  local data = turtle.getItemDetail()
  if not data then
    print("Please put coal in slot 1")
    error()
  elseif data.name ~= "minecraft:coal" then
    print("Please put coal in slot 1")
    error()
  end
  turtle.select(2)
  data = turtle.getItemDetail()
  if not data then
    print("Please put a chest in slot 2")
    error()
  elseif data.name ~= "minecraft:chest" then
    print("Please put a chest in slot 2")
    error()
  end
end

check()
dig(length,height)
unload(length)
print("Done")