Libturtle

oldF = _G.turtle.forward
oldB = _G.turtle.back
oldU = _G.turtle.up
oldD = _G.turtle.down
oldR = _g.turtle.refuel
local function lab()
  os.setComputerLabel("Matts Turtle | ".. turtle.getFuelLevel())
end
_G.turtle.forward = function()
  oldF()
  return lab()
end

_G.turtle.back = function()
  oldB()
  return lab()
end

_G.turtle.up = function()
  oldU()
  return lab()
end

_G.turtle.down = function()
  oldD()
  return lab()
end

_G.turtle.refuel = function()
    oldR()
    return lab()
end