[FTB] Strip Miner v1.1.5

local height = 0
local movedBlocks = 0
local direction = "up"
local canMine = true

local function FetchItems()
  turtle.suck()
  turtle.suckUp()
  turtle.suckDown()
end

local function CheckFuel()
  if turtle.getFuelLevel() == 0 then
    turtle.refuel(1)
  end
end

local function PlaceTorch()
  if (movedBlocks % 5 == 0) and (height == 2) then
    turtle.select(2)
    turtle.digUp()
    turtle.placeUp()
    turtle.select(1)
  end
end

local function CheckBackpack()
  emptySlots = 0
  for i = 1, 16 do
    if turtle.getItemCount(i) == 0 then
      emptySlots = emptySlots + 1
    end
  end

  if emptySlots == 0 then
    canMine = false
  end
end

local function TryMove(direction)
  attempt = 1

  while true do
    CheckFuel()
    if direction == "up" then
      if turtle.up() == true then
        break
      else
        turtle.digUp()
      end
    elseif direction == "down" then
      if turtle.down() == true then
        break
      else
        turtle.digDown()
      end
    elseif direction == "forward" then
      if turtle.forward() == true then
        break
      else
        turtle.dig()
      end
    elseif direction == "back" then
      if turtle.back() == true then
        break
      end
    end

    if attempt > 5 then
      canMine = false
    end

    attempt = attempt + 1
  end
end

local function TryMine(direction)
  while true do
    if direction == "up" then
      if turtle.detectUp() == true then
        turtle.digUp()
        FetchItems()
      end
    elseif direction == "down" then
      if turtle.detectDown() == true then
        turtle.digDown()
        FetchItems()
      end
    elseif direction == "forward" then
      if turtle.detect() == true then
        turtle.dig()
        FetchItems()
      end
    end
  end
end

local function Mine()
  while canMine == true do

    if (movedBlocks > 0) and (movedBlocks % 10 == 0) then
      CheckBackpack()
    end

    if turtle.detect() == true then
      TryMine("forward")
    end

    TryMove("forward")
    movedBlocks = movedBlocks + 1

    for i = 1, 2 do
      PlaceTorch()
      if (height < 2) and (direction == "up")  then
        if turtle.detectUp() == true then
          TryMine("up")
        end

        TryMove(direction)
        height = height + 1

        if height == 2 then
          direction = "down"
        end

      elseif (height > 0) and (direction == "down") then
        if turtle.detectDown() == true then
          TryMine("down")
        end

        TryMove(direction)
        height = height - 1

        if height == 0 then
          direction = "up"
        end
      end
    end
  end
end

CheckFuel()
Mine()

for i = 1, height do
  TryMove("down")
end

for i = 1, movedBlocks do
  TryMove("back")
end