Harvester

function PickupItems()
   turtle.turnRight()
   turtle.select(1)

   --Imports coal & 2 stacks of seeds
   --from the chest to the right.
   for i = 1, 3 do
      turtle.suck()
   end -- end for

   turtle.turnLeft()
end -- end function


function Refuel()
   if turtle.getFuelLevel() < 20 then
      turtle.refuel(1)
   else
      print(turtle.getFuelLevel())
   end -- end if
end -- end function

function GetReady()
   --Moves the turtle into a starting
   --position.
   turtle.up(1)
   turtle.forward(1)

   --Selects seeds to plant
   turtle.select(2)
end -- end function

function Harvest()
   local turnCount = 1
   for i = 1, 9 do --number of rows
      if i == 5 then -- middle row has sprinkler to avoid
          for j = 1, 4 do
             turtle.forward(1)
             turtle.digDown()
             turtle.placeDown()
          end -- end for
          turtle.forward(1)
          for j =1, 4 do
             turtle.forward(1)
             turtle.digDown()
             turtle.placeDown()
          end -- end for
      else
         for k = 1, 9 do --number of tiles in 1 row
            turtle.forward(1)
            turtle.digDown()
            turtle.placeDown()
         end--end for
      end -- end if
      Refuel()

      if turnCount % 2 == 0 then
         turtle.turnLeft()
      else
         turtle.turnRight()
      end --end if

      turtle.forward(1)
      turtle.digDown()
      turtle.placeDown()

--      if i == 10 then
--         break
--      end--end if

      if turnCount % 2 == 0 then
         turtle.turnLeft()
      else
         turtle.turnRight()
      end -- end if

      turnCount = turnCount + 1

   end --end for loop
end--end function

function ReturnToStart()
end

--main
PickupItems()
Refuel()
GetReady()
Harvest()