vivid

defimpl Collectable, for: Vivid.Path do
  alias Vivid.{Path, Point}

  @doc """
  Collect an enumerable into a Path.

  ## Examples

      iex> [Vivid.Point.init(1,1)] |> Enum.into(Vivid.Path.init)
      %Vivid.Path{vertices: [%Vivid.Point{x: 1, y: 1}]}
  """
  @spec into(Path.t()) :: {list, function}
  def into(%Path{vertices: points}) do
    {[],
     fn
       list, {:cont, %Point{} = point} -> [point | list]
       list, :done -> Path.init(points ++ list)
       _, :halt -> :ok
     end}
  end
end