vine turtle

local minFuel = 600
function checkFuel()
  if turtle.getFuelLevel() < minFuel then
    turtle.select(16)
    if turtle.compareDown() then
      while turtle.getFuelLevel() < minFuel then
        turtle.select(15)
        turtle.suckDown()
        turtle.refuel()
        if turtle.getFuelLevel() < minFuel then
          sleep(60)
        end
      end
    end
  end
end

function tryDump()
  turtle.select(16)
  if turtle.compareUp() then
    for i = 1,15 do
      if turtle.getItemCount(i) > 0 then
        turtle.select(i)
        while not turtle.dropUp() do
          sleep(30)
        end
      end
    end
  end
end

while true do
  tryDump()
  checkFuel()
  if turtle.detect() then
    turtle.turnRight()
    sleep(5)
  end
  turtle.select(1)
  turtle.dig()
  turtle.forwards()
end