angular-docs-cn/public/_includes/_docs-nav.jade

nav.side-nav.l-pinned-left.l-layer-4.l-offset-nav
  header.side-nav-search.st-input-wrapper
    form.st-input-inner
      label(for="search-io" class="is-hidden") Search Docs
      input(type="search" id="search-io" placeholder="SEARCH DOCS...")
    button(aria-label="Docs Menu" class="mobile-trigger button" aria-label="View Docs Menu" ng-click="toggleDocsMenu($event)" md-button) Docs <span class="icon icon-arrow-drop-down"></span>

  ul(class="side-nav-primary" ng-class="showDocsNav ? 'is-visible' : ''")
    if current.path[2]
      for page, slug in public.docs[current.path[1]][current.path[2]]._data
        name = page.menuTitle || page.title
        selected =  current.path[3] == slug ? 'is-selected':''

        // PRIMARY NAVIGATION
        if public.docs[current.path[1]][current.path[2]][slug]
          li(class="#{selected}") <a href="/docs/#{current.path[1]}/#{current.path[2]}/#{slug}/" md-button><span class="side-nav-icon icon-#{page.icon}"></span> #{name}</a>

        else
          li(class="#{selected}") <a href="/docs/#{current.path[1]}/#{current.path[2]}/#{slug}.html" md-button><span class="side-nav-icon icon-#{page.icon}"></span> #{name}</a>

        // SECONDARY NAVIGATION
        if selected
          secondarySection = public.docs[current.path[1]][current.path[2]][current.path[3]]

          if secondarySection
            listType = public.docs[current.path[1]][current.path[2]][current.path[3]]._data._listtype || 'unordered'
            ordered = listType == "ordered" ? "is-ordered" : ""
            number = 0

            ul(class="side-nav-secondary #{ordered}")

              for page, slug in public.docs[current.path[1]][current.path[2]][current.path[3]]._data
                if slug != "index"
                  name = page.menuTitle || page.title
                  selected =  current.path[4] == slug ? 'is-selected':''
                  num = (listType == "ordered") ? number++ : ''

                  if slug != "_listtype"
                    if num
                      li(class="#{selected}") <a href="/docs/#{current.path[1]}/#{current.path[2]}/#{current.path[3]}/#{slug}.html" md-button>#{num}.  #{page.title}</a>

                    else
                      li(class="#{selected}") <a href="/docs/#{current.path[1]}/#{current.path[2]}/#{current.path[3]}/#{slug}.html" md-button>#{page.title}</a>


                // TERTIARY NAVIGATION
                if selected
                  tertiarySection = public.docs[current.path[1]][current.path[2]][current.path[3]][current.path[4]]

                  if tertiarySection
                    ul.side-nav-tertiary
                      for page, slug in public.docs[current.path[1]][current.path[2]][current.path[3]][current.path[4]]._data
                        name = page.menuTitle || page.title
                        selected =  current.path[5] == slug ? 'is-selected':''
                        li(class="#{selected}")<a  href="/docs/#{current.path[1]}/#{current.path[2]}/#{current.path[3]}/#{current.path[4]}/#{slug}.html" md-button>#{name}</a>