Parse frontmatter in Elixir

frontmatter.ex

  def extract(changeset) do
    file_name = changeset.data.name
    data = File.read!("#{@data_folder}/pages/#{file_name}")
    case String.split(data, ~r/\n-{3,}\n/, parts: 2) do
      [""] ->
        %{frontmatter: nil, content: nil}
      [frontmatter, content] ->
        %{
          frontmatter: parse_yaml(frontmatter),
          content: content
        }
      _ ->
        %{frontmatter: nil, content: nil}
    end
    # {parse_yaml(frontmatter), Earmark.to_html(markdown)}
  end