Farming Turtle

local args = {...}

if #args ~= 1 then
  print("Please give me a range")
  error()
end

range = args[1] + 0
maxRange = range -1
print("range selected", range, "x", range)

function doMovement()
  local turnedRight = false
  -- do farming
  for j = 1, range, 1 do
    -- begin row
    for i = 1, maxRange, 1 do
      -- check slot
      doFarmCheck()
      turtle.forward()
    end
    -- end of the row

    if (j < range) then
      if turnedRight then
        turtle.turnLeft()
        doFarmCheck()
        turtle.forward()
        turtle.turnLeft()
        turnedRight = false
      else
        turtle.turnRight()
        doFarmCheck()
        turtle.forward()
        turtle.turnRight()
        turnedRight = true
      end
    end
  end
  -- return home
  doFarmCheck()
  print("returning home")
  turtle.turnLeft()
  for r = 1, maxRange, 1 do
    turtle.forward()
  end
  turtle.turnLeft()
  for r = 1, maxRange, 1 do
    turtle.forward()
  end
  -- check stuff
  deposit()
  turtle.turnLeft()
  turtle.turnLeft()
end

function doFarmCheck()
  local success, data = turtle.inspectDown()
  if isGrown(data) then
    turtle.digDown()
    turtle.select(2)
    turtle.placeDown()
  elseif not success then
    turtle.select(2)
    turtle.placeDown()
  end
  turtle.suckDown()
  turtle.suckDown()
end

function manageInv()
  local foundCoal = false
  -- check coal
  if turtle.getItemDetail(1) ~= "minecraft:coal" then
    for c = 1, 16, 1 do
      local data = turtle.getItemDetail(c)
      if data and data.name == "minecraft:coal" then
        turtle.select(c)
        turtle.transferTo(1)
        foundCoal = true
      end
    end
  end

  -- check seeds
  if turtle.getItemDetail(2) ~= "minecraft:wheat_seeds" then
    print("no seeds found in slot 2")
    for s = 1, 16, 1 do
      local data = turtle.getItemDetail(s)
      if data and data.name == "minecraft:wheat_seeds" then
        turtle.select(s)
        turtle.transferTo(2)
        foundSeeds = true
      end
    end
  end
  if not foundCoal or not foundSeeds then
    turtle.select(1)
    turtle.suck()
    turtle.select(2)
    turtle.suck()
  end
end

function isGrown(data)
   if data.name == "minecraft:wheat" then
     if data.state.age == 7 then
       return true
     end
   end
   return false
end

function doFuelCheck()
  if turtle.getFuelLevel() < 100 then
    print("nom da coal")
    turtle.select(1)
    turtle.refuel(2)
  end
end

function deposit()
  for n = 3, 16, 1 do
    turtle.select(n)
    turtle.drop()
  end
end

function farm()
  manageInv()
  doFuelCheck()
  while (true) do
    doMovement()
    sleep(60)
    manageInv()
    doFuelCheck()
  end
end

farm()