Farmer

local arguments={...}
if #arguments~=1 then
  print("Usage: Farmer <Side Length>")
  return
end
local length=tonumber(arguments[1])
if length<2 then
  print("Side length must be greater than 1")
  return
end

function blockHarvest()
  turtle.digDown()
  turtle.placeDown()
end

function row(dist)
  for l=1, dist, 1 do
    blockHarvest()
    if l~=dist then
      while not turtle.forward() do
        turtle.dig()
        turtle.attack()
      end
    end
  end
end

if math.fmod(length, 2)==0 then
  for i=1, math.ceil(length/2), 1 do
    row(length)
    turtle.turnRight()

    while not turtle.forward() do
      turtle.dig()
      turtle.attack()
    end

    turtle.turnRight()

    row(length)
    if i~=math.ceil(length/2) then
      turtle.turnLeft()

      while not turtle.forward() do
        turtle.dig()
        turtle.attack()
      end

      turtle.turnLeft()
    else
      turtle.turnRight()
    end
  end

  for q=2, length, 1 do
    turtle.forward()
  end

  turtle.turnRight()
else
  for i=1, math.ceil((length-1)/2) do
    row(length)

    turtle.turnRight()
    while not turtle.forward() do
      turtle.dig()
      turtle.attack()
    end
    turtle.turnRight()

    row(length)

    turtle.turnLeft()
    while not turtle.forward() do
      turtle.dig()
      turtle.attack()
    end
    turtle.turnLeft()
  end
  row(length)

  turtle.turnLeft()
  for q=2, length, 1 do
    turtle.forward()
  end
  turtle.turnLeft()
  for q=2, length, 1 do
    turtle.forward()
  end
  turtle.turnRight()
  turtle.turnRight()
end