def render()

in server/src/main/scala/com/twitter/server/view/IndexView.scala [37:128]
82 lines of code
11 McCabe index (conditional complexity)

  def render(title: String, uri: String, nav: Seq[Entry], contents: Reader[Buf]): Reader[Buf] = {

    def renderNav(ls: Seq[Entry], sb: StringBuilder = new StringBuilder): String = ls match {
      case Seq() => sb.toString

      case Link(id, href, Post) +: rest =>
        // Spaces are replaced with '-' since HTML IDs do not permit whitespace
        val formattedId = id.replace(' ', '-')
        val selected = if (href == uri) "selected" else ""
        sb ++= s"""
              <form method="post" id="${formattedId}-form" action="${href}">
                <a href="#" onclick="document.getElementById('${formattedId}-form').submit()">
                  <li id="${formattedId}" class="selectable $selected">
                    ${id}
                  </li>
                </a>
              </form>
              """
        renderNav(rest, sb)

      case Link(id, href, Get) +: rest =>
        // Spaces are replaced with '-' since HTML IDs do not permit whitespace
        val formattedId = id.replace(' ', '-')
        val selected = if (href == uri) "selected" else ""
        sb ++= s"""
            <a href="${href}">
              <li id="${formattedId}" class="selectable $selected">
                ${escapeHtml(id)}
              </li>
            </a>
            """
        renderNav(rest, sb)

      case Group(id, links) +: rest =>
        val isChild = links exists {
          // Instead of strictly checking for href == uri,
          // we are a bit more liberal to allow for "catch-all"
          // endpoints (ex. /admin/clients/).
          case Link(_, href, _) => !href.stripPrefix(uri).contains("/")
          case _ => false
        }
        val active = if (isChild) "active" else ""
        val collapse = if (isChild) "glyphicon-collapse-up" else ""
        sb ++= s"""
            <li class="subnav $active">
              <div class="subnav-title selectable">
                <span class="glyphicon glyphicon-expand $collapse"></span>
                <span>${escapeHtml(id)}</span>
              </div>
              <ul>${renderNav(links)}</ul>
            </li>"""
        renderNav(rest, sb)
    }

    Reader.concat(
      Reader.fromBuf(
        Buf.Utf8(
          s"""<!DOCTYPE html>
            <html>
              <head>
                <title>${title} &middot; Twitter Server Admin</title>
                <!-- css -->
                <link type="text/css" href="/admin/files/css/bootstrap.min.css" rel="stylesheet"/>
                <link type="text/css" href="/admin/files/css/index.css" rel="stylesheet"/>
                <link type="text/css" href="/admin/files/css/client-registry.css" rel="stylesheet"/>
                <!-- js -->
                <script type="application/javascript" src="//www.google.com/jsapi"></script>
                <script type="application/javascript" src="/admin/files/js/jquery.min.js"></script>
                <script type="application/javascript" src="/admin/files/js/bootstrap.min.js"></script>
                <script type="application/javascript" src="/admin/files/js/index.js"></script>
                <script type="application/javascript" src="/admin/files/js/utils.js"></script>
              </head>
              <body>
                <div id="wrapper">
                  <nav id="sidebar">
                    <ul>${renderNav(nav)}</ul>
                  </nav>
                  <div id="toggle"><span class="glyphicon glyphicon-chevron-left"></span></div>
                  <div id="contents" class="container-fluid">
                    <div class="row">
                      <div class="col-md-12">"""
        )
      )
        +:: contents
        +:: AsyncStream.of(Reader.fromBuf(Buf.Utf8("""</div>
                    </div>
                  </div>
                </div>
              </body>
            </html>""")))
    )
  }