huber

function checkFuel()
  if turtle.getFuelLevel() < 10 then
    turtle.select(1)
    turtle.refuel(1)
  end
  turtle.select(2)
end

function digMove()
  checkFuel()
  turtle.dig()
  turtle.forward()
end

function column()
  height = 0
  while turtle.digUp() do
    checkFuel()
    turtle.dig()
    turtle.up()
    height = height + 1
  end
  return height
end

function columnDown(height)
  for i=1,height do
    checkFuel()
    turtle.dig()
    turtle.digDown()
    turtle.down()
  end
  turtle.dig()
end

function chest()
  turtle.back()
  turtle.dig()
  turtle.back()
  turtle.dig()
  turtle.back()
  turtle.dig()
  turtle.turnLeft()
  for i=3,16 do
    turtle.select(i)
    turtle.drop()
  end
  turtle.up()
  turtle.select(1)
  if turtle.getItemCount(1) == 0 then
    turtle.suck()
  end
  turtle.up()
  turtle.select(2)
  if turtle.getItemCount(2) < 4 then
    turtle.suck()
  end
  turtle.down()
  turtle.down()
  turtle.turnRight()
end

function replant()
  turtle.select(2)
  turtle.forward()
  turtle.forward()
  turtle.forward()
  turtle.forward()
  turtle.place()
  turtle.turnRight()
  turtle.forward()
  turtle.turnLeft()
  turtle.place()
  turtle.turnRight()
  turtle.back()
  turtle.place()
  turtle.turnLeft()
  turtle.back()
  turtle.place()
end

function chop()
  digMove()
  distance = column()
  turtle.turnRight()
  digMove()
  turtle.turnLeft()
  columnDown(distance)
  turtle.turnLeft()
  turtle.forward()
  turtle.turnRight()
  turtle.back()
  chest()
  replant()
end

while true do
  turtle.select(2)
  if not turtle.compare() then
     chop()
  end
end