miningTurtle

local frontBlock = turtle.detect()
local downBlock = turtle.detectDown()
local upBlock = turtle.detectUp()
local fuel = turtle.getFuelLevel()
local modem = peripheral.wrap("back")

function dig(blocks, direction)
  for e=1, blocks
  do
    if fuel >= 1
    then
      if direction == "in front"
      then
        turtle.dig()
        turtle.forward()
      elseif direction == "up"
      then
        turtle.digUp()
        turtle.up()
      elseif direction == "down"
      then
        turtle.digDown()
        turtle.down()
      end
    else
      modem.transmit(1, 2, "ERROR: MISSING FUEL")
    end
  end

function turn(times, direction2)
  for x=1, times
  do
    if direction2 == "right"
    then
      turtle.turnRight()
    elseif direction2 == "left"
    then
      turtle.turnLeft()
    end
  end
end

io.write("How many levels you want to excavate? \n"..
         "(divide by two the levels you choose, it must be a whole number)\n")
levels = io.read()
if pcall((tonumber(levels)/2)
  -- TUNNEL 2x2:
  for i=1, levels/2
   -- 1st level:
  dig(20, "down")
  dig(1, "in front")
  turn(1, "right")
  dig(1, "in front")
  dig(1, "up")
  turn(2, "left")
  dig(1, "in front")
  turn(1, "right")
   -- 2nd level:
  dig(1, "in front")
  turn(1, "right")
  dig(1, "in front")
  dig(1, "down")
  turn(2, "left")
  dig(1, "in front")
  turn(1, "right")
end