Mining Turtle EXPERIMENTAL!

--KdMine by Kd8lvt--
--Made for Lokbatch, and personal use--
--Type 'copyright' as the length to see an abbreviated version of the Mozilla Public License.--
function dump()
  for i = 1,16 do
    itemid = turtle.getItemDetal(i)
    if itemid == "minecraft:cobblestone" then
      turtle.select(i)
      turtle.drop()
    elseif itemid == "minecraft:netherrack" then
      turtle.select(i)
      turtle.drop()
    else
      --Do nothing, we want to keep this item!
    end
  end
  turtle.select(1)
end
function dig(direction)
  if direction == "up" then
    turtle.digUp()
  elseif direction == "down" then
    turtle.digDown()
  else
    turtle.dig()
  end
end
function turn(direction, times)
  if times then
    while times > 0 do
      if direction == "left" then
        turtle.turnLeft()
      elseif direction == "right" then
        turtle.turnRight()
      end
      times = times - 1
    end
  else
    if direction == "left" then
      turtle.turnLeft()
    elseif direction == "right" then
      turtle.turnRight()
    end
  end
end
function mine(length)
  turn("left",2)
  dump()
  turn("left",2)
  dig()
  turtle.forward()
  dig("up")
  turtle.up()
  if lastTorch then
    if length == lastTorch - 4 then
      torch()
    end
  else
    torch()
    lastTorch = length
  end
  dig("up")
  turn("left")
  dig()
  turtle.forward()
  turn("right",2)
  dig("up")
  dig("down")
  turtle.forward()
  dig()
  turtle.forward()
  dig("up")
  dig("down")
  turn("left",2)
  turtle.forward()
  turtle.down()
  turn("right")
end
function checkFuel()
  local fuel = turtle.getFuelLevel()
  if fuel < 50 then
    for i = 1,16 do
      itemid, count = turtle.getItemDetail(i)
      if itemid == "minecraft:coal" then
        turtle.select(i)
        if count > 31 then
          turtle.refuel(count/2)
        end
      elseif itemid == "minecraft:charcoal" then
        turtle.select(i)
        if count > 31 then
          turtle.refuel(count/2)
        end
      elseif itemid == "minecraft:lava_bucket" then
        turtle.select(i)
        turtle.refuel()
      elseif i == 16 and turtle.getFuelLevel == fuel then
        error("I ran out of fuel! Please refuel me :( I can take Coal, Charcoal, or Lava.")
      end
    end
  end
end
function torch()
  for i = 1,16 do
    itemid = turtle.getItemDetail(i)
    if itemid == "minecraft:torch" then
      turtle.select(i)
      turtle.placeDown()
    end
  end
end
function main()
  textutils.slowPrint("How far to mine? [Or, type 'license' to see the license]")
  input = io.read()
  if input == "license" then
    print("This work is protected under the Mozilla Public License 2.0. here is an abbreviated version: ")
    print("If you edit and re-publish this work, you MUST: ")
    print("    1. Disclose your source (Make it open-source)")
    print("    2. License and copyright notice (Just don't change this part and you'll be fine)")
    print("You are NOT allowed to do these things: ")
    print("    1. Hold kd8lvt liable for any damages done to your game / computer (It shouldn't anyways)")
    print("    2. Use a trademark (This does NOT grant you any rights in the trademarks or other rights of contributors.)")
    print("You ARE allowed to do these things:  ")
    print("    1. Use this for commercial purposes (I'd prefer if you didn't though, Ad.fly is ok.)")
    print("    2. Redistribute")
    print("    3. Modify")
    print("    4. Use Patents")
    print("    5. Use and modify without distributing (no liability to kd8lvt)")
    print("    6. Sublicense (I don't have one)")
    error("Displayed Abbreviated Mozilla Public License 2.0")
  else
    if tonumber(input) ~= nil then
      length = tonumber(input)
      while length > 0 do
        mine(length)
        length = length - 1
      end
    else
      error("You must input a number, or 'license'")
    end
  end
end
while true do
  main()
end