function refuel()
   if turtle.getFuelLevel() == 0 then
      turtle.select(1)
      turtle.refuel(1)
      print("refueling")
   end
end

function plant()
   turtle.select(2)
   turtle.placeDown()
end

function harvest()
   turtle.digDown()
end

function prepare()
   turtle.attackDown()
end

function turnLeft()
   turtle.turnLeft()
   turtle.forward()
   turtle.turnLeft()
end

function turnRight()
   turtle.turnRight()
   turtle.forward()
   turtle.turnRight()
end

function work()
   turtle.turnRight()

   for i=1,7 do
      harvest()
      prepare()
      plant()
      turtle.forward()
   end

   turnLeft()

   for i=1,7 do
      harvest()
      prepare()
      plant()
      turtle.forward()
   end

   turnRight()

   for i=1,8 do
      harvest()
      prepare()
      plant()
      turtle.forward()
   end

   turnLeft()

end

function main()
   print("Starting")
   refuel()
   turtle.up()
   turtle.up()
   turtle.forward()
   turtle.forward()
   work()
   print("end")
end


main()