     |> :io_lib.format([tag_name])
     |> IO.iodata_to_binary()
   end
-
-  @spec rename_first_file(binary()) :: binary()
-  defp rename_first_file(path) do
-    path |> Path.dirname() |> Path.join("index.html")
-  end
 end

  def to_fragment(post_lists) do
    case to_html(post_lists) do
      {:ok, htmls} ->
        fragments =
          post_lists
          |> Stream.zip(htmls)
          |> Enum.map(fn {list, html} -> Fragment.new(:list, list, html) end)

        {:ok, fragments}

      {:error, _} = error ->
        error

    max_page = length(paginated_posts)
    list_dir = (tag && Path.join("tags", tag.name)) || "posts"

    Enum.map(paginated_posts, fn {posts, page} ->
      %__MODULE__{
        tag: tag,
        page: page,
        max_page: max_page,
        title: list_title(tag, proj),
        posts: posts,
        list_url: Path.join([proj.base_url, list_dir, "page-#{page}.html"]),
        output: Path.join([proj.dest, list_dir, "page-#{page}.html"])
      }
    end)
  end

  @spec make_chunks([Post.t()], boolean(), pos_integer()) :: [[Post.t()]]
