Refactor rendering of class view sidebar.

        return [

          "<div>",

            render_hierarchy,

            render_sidebar,

            "<div class='doc-contents'>",

              render_private_class_notice,

              @cls[:doc],

      html

    end

    def render_hierarchy

      has_parents = @cls[:extends] && @cls[:extends] != "Object"

      has_alt_names = @cls[:alternateClassNames].length > 0

      has_mixins = @cls[:superclasses].length > 0

      has_files = @cls[:files].length > 0 && @cls[:files][0][:filename] != ""

      return if !has_parents && !has_alt_names && !has_mixins && !has_files

      return [

        '<pre class="hierarchy">',

    def render_sidebar

      items = [

        render_alternate_class_names,

        render_tree,

        render_mixins,

        render_files,

        '</pre>'

      ]

      if items.compact.length > 0

        return ['<pre class="hierarchy">', items, '</pre>']

      else

        return nil

      end

    end

    def render_alternate_class_names

    def render_files

      return if @cls[:files].length == 0 || @cls[:files][0][:filename] == ""

      return [

        "<h4>Files</h4>",

        @cls[:files].map do |file|