farming

--Farming
local currentW = 1
local currentD = 1
width = 9
depth = 9
lr = 0
function getWheat()
  local success, data = turtle.inspectDown()
  if  success then
    if data.name == "minecraft:wheat" then
      if  data.metadata == 7 then
        turtle.digDown()
      end
    end
  end
end
function seed()
  local existS = turtle.detectDown()
  if existS == false then
--    turtle.down(1)
--    turtle.up(1)
    turtle.digDown()
    existSeedslot = 0
    for i = 1 , 16 do
        turtle.select(i)
        local data = turtle.getItemDetail(i)
        if data ~= nill and data.name == "minecraft:wheat_seeds" then
            existSeedslot = i
            i = 16
        end
        data = 0
    end
    if existSeedslot ~= 0 then
        turtle.select(existSeedslot)
        turtle.placeDown()
    end
  end
end
function back()
  for i = 2 , width do
    turtle.back()
  end
  if lr == 1 then
    turtle.turnLeft()
    for i = 2 , depth do
      turtle.back()
    end
  end
end
getWheat()
seed()
local loop = 1
while loop == 1 do
  currentD = 1
  while currentD < depth do
    turtle.forward(1)
    getWheat()
    seed()
    currentD = currentD + 1
  end
  if lr == 0 then
    turtle.turnRight()
    lr = 1
  else
    turtle.turnLeft()
    lr = 0
  end
  if currentW < width then
    turtle.forward()
    currentW = currentW + 1

    if lr == 0 then
      turtle.turnLeft()
    else
      turtle.turnRight()
    end
    getWheat()
    seed()
  else
    back()
    currentW = 1
    getWheat()
    seed()
    lr = 0
  end
end