stripMine2

--constants
local lava = "minecraft:lava"
local flowingLava = "minecraft:flowing_lava"

local water = "minecraft:water"
local flowingWater = "minecraft:flowing_water"

local stone = "minecraft:stone"

local iron = "minecraft:iron_ore"
local coal = "minecraft:coal_ore"
local redstone = "minecraft:redstone_ore"
local diamond = "minecraft:diamond_ore"

local ores = {iron,coal,redstone,diamond}
local fluids = {lava,flowingLava,water,flowingWater}
--functions

--printList
local function printList(list)
  for _,item in pairs(list) do
    print(item)
  end
end


-- check for a block in front, down and up
-- ex (2, "front")
local function findBlock(blocksTypes, direction)
  local foundBlock = false

  -- check directiom
  if direction == "front" then
    succes, data = turtle.inspect()
  elseif direction == "up" then
    succes, data = turtle.inspectUp()
  elseif direction == "down" then
    succes, data = turtle.inspectDown()
  else
    error("function: findBlock() needs direction")
  end

  -- find block
  local type = 0

  for _,blocks in pairs(blocksTypes) do
    type = type + 1
    for _,block in pairs(blocks) do
      if succes and data.name == block then
        foundBlock = type
      elseif not succes then
        foundBlock = -1
      end
    end
  end

  print("BlockID",direction,":", data.name)

  return foundBlock
end


--shaftCreate
-- mines above and forward
local function tunnelCreate()

  local gotFuel = true

  turtle.digUp()
  turtle.dig()
  succes, reason = turtle.forward()

  if succes == false then
    print("Turtle didn't move")
    if reason == "Out of fuel" then
      gotFuel = false
    elseif reason == "Movement obstructed" then
      print("tumnel3(): Movement obstructed")
    end
  end

  return gotFuel
end


--main
local args = {...}
local len = args[1]
local foundBlockDown = 0

for i = 1,len do
  if not tunnelCreate() then
    turtle.refuel()
  end

  foundBlockDown = findBlock({ores,fluids,},"down")
  if foundBlockDown == 1 then
    print("found a ore")
  elseif foundBlockDown == 2 then
    turtle.suckDown()
    turtle.placeDown(1)
    print("found a fluid")
  elseif foundBlockDown == -1 then
    print("found a gap")
    turtle.placeDown(1)
  end
  foundBlockDown = 0

end