2x2TreeTurtle

local function goup()
  while turtle.detect() == true do
    turtle.dig()
    if turtle.detectUp() == false then
      turtle.up()
    else
      turtle.digUp()
      turtle.up()
    end
    if redstone.getInput("left") == true then
      return
    end
  end
end
local function godown()
  while turtle.detect() == true and turtle.detectDown() == false do
    turtle.dig()
    turtle.down()
    if redstone.getInput("left") == true then
      return
    end
  end
end
local function checkfuel()
  if turtle.getFuelLevel() < 30 then
    turtle.refuel()
  end
end

while redstone.getInput("left") == false do
checkfuel()
goup()
checkfuel()
turtle.forward()
turtle.down()
godown()
checkfuel()
goup()
checkfuel()
godown()
turtle.forward()
turtle.forward()
turtle.turnLeft()
turtle.forward()
turtle.turnLeft()
turtle.down()

checkfuel()
goup()
checkfuel()
turtle.forward()
turtle.down()
godown()
checkfuel()
goup()
checkfuel()
godown()
turtle.forward()
turtle.forward()
turtle.turnLeft()
turtle.forward()
turtle.turnLeft()
turtle.down()
turtle.select(2)
while turtle.compare() == false do
    if redstone.getInput("left") == true then
        return
    end
    sleep(0.1)
end
turtle.select(1)
end