Pyramid Builder

-- Assume that the turtle starts at the bottom left of the pyramid.

turtle_location = vector.new(0,0,0)
turtle_slot = 1

function place_block()
  if not turtle.detectDown() then
    while not turtle.placeDown() do
      turtle_slot = turtle_slot + 1
      turtle.select(turtle_slot)
    end
  end
end

function lay_side(n_size)
 -- Lays a single side of the pyramid.
 row_count = 0
 while row_count < n_size do
  row_count = row_count + 1
  place_block()
  while not turtle.forward() do
   turtle.dig()
   os.sleep(5)
  end
 end
end

function square(n_size)
 n_sides = 0
 while n_sides < 4 do
  lay_side(n_size-1)
  turtle.turnRight()
  n_sides = n_sides + 1
 end
end

function pyramid(n_size)
 layer_size = n_size
 while layer_size > 1 do
  square(layer_size)
  turtle.forward()
  turtle.turnRight()
  turtle.forward()
  turtle.turnLeft()
  turtle.up()
  layer_size = layer_size - 2
 end
end

function main()
 pyramid_size = 0
 print("Enter size of pyramid.")
  pyramid_size = tonumber(read())
  turtle.up()
  pyramid(pyramid_size)
end

main()