local distanceX = 0
local fuelAmount = 0
local fuel = 0
light = 8

local items = {
  ["minecraft:cobblestone"] = true,
  ["minecraft:dirt"] = true,
  ["minecraft:gravel"] = true,
  ["minecraft:diorite"] = true,
  ["minecraft:granite"] = true,
  ["chisel:limestone2"] = true,
}

function distAdd()
  distanceX = distanceX + 1
print("i have travelled" .. distance .. "blocks!"")
end

function forward()
if turtle.forward()
                repeat
                turtle.dig()
                turtle.attack()
                sleep(0.25)
                until turtle.forward()
              end
end

function placeLight()
  if light == 0 then
   turtle.select(2)
   turtle.place()
   else
   light = light - 1
  end
end

function mine()
  turtle.dig()
  forward()
  turtle.digDown()
  turtle.digUp()
  turtle.turnLeft()
  turtle.dig()
  forward()
  turtle.digUp()
  turtle.digDown()
  turtle.dig()
  forward()
  turtle.digDown()
  turtle.digUp()
  turtle.turnLeft()
  turtle.turnLeft()
  forward()
  forward()
  turtle.turnLeft()
  distAdd()
end

function home()
  return = distanceX
  turtle.turnLeft()
  turtle.turnLeft()
  print("Returning home")
    for i = 1,distanceX do
      turtle.forward()
    end
end

function return()
turtle.turnRight()
turtle.turnRight()
print("Returning to work")
  for i = 1,return do
    turtle.forward()
  end
end

fuelChk()
turtle.select(1)
fuel = turtle.getItemCount()
end

function refuel()
  turtle.select(1)
    if turtle.refuel(0) = true then
    amount = turtle.getItemCount()
      if turtle.getItemCount() <= 1 then
      print("Out of fuel")
      else
      turtle.refuel(amount - 1)
    end
  end
end

function invChk()
  for invent = 1,16 do
  turtle.select(invent)
  local data = turtle.getItemDetail()
    if items[ data.name ] then
    print("dropping" .. data.count .. "of" .. data.name.. ".")
     turtle.drop()
    end
  end
end

fuelChk()
while fuel == distance * 2 do
mine()
invChk()
end
refuel()
if fuel < distance * 2 then
   print("out of fuel")
   repeat
   turtle.refuel()
   until fuel > distance * 2