Add extractor for macstories.net

lib/frenzy/pipeline/extractor/macstories.ex

@@ -0,0 +1,36 @@
+defmodule Frenzy.Pipeline.Extractor.MacStories do
+  @moduledoc """
+  Extractor for https://macstories.net
+  """
+
+  alias Frenzy.Pipeline.Extractor
+  @behaviour Extractor
+
+  @impl Extractor
+  def extract(html_tree) do
+    case Floki.find(html_tree, ".post-content") do
+      [content_elem | _] ->
+        content_elem =
+          content_elem
+          # some images have full size links, strip those out
+          |> Floki.filter_out("a.view-full-size")
+          # rewrite non-standard images captions to <figure>/<figcaption>
+          |> Floki.map(&rewrite_element/1)
+
+        {:ok, content_elem}
+
+      _ ->
+        {:error, "no matching elements"}
+    end
+  end
+
+  defp rewrite_element({"div", [{"class", "media-wrapper"}]}) do
+    {"figure", []}
+  end
+
+  defp rewrite_element({"p", [{"class", "image-caption"}]}) do
+    {"figcaption", []}
+  end
+
+  defp rewrite_element(elem), do: elem
+end