{{ $currentPage := . }}
<ul>
  <div class="sidebar-header">
   {{ if eq .Lang "en"}}
      <a class="sidebar-brand" href="/en/">
      <img src="/page-resources/wmi_transparent.png">
      {{ .Site.Title }}
      </a>
      {{else}}
      <a class="sidebar-brand" href="/">
      <img src="/page-resources/wmi_transparent.png">
      {{ .Site.Title }}
      </a>
      {{end}}

      <form class="sidebar-header sidebar-brand" action="https://szukaj.wmi.amu.edu.pl/search/" method="GET">
        <div class="input-group">
          <input type="text" class="form-control" name="q" placeholder="Search" />
            <span class="input-group-btn">
              <button type="submit" class="btn btn-default">
                <span class="glyphicon glyphicon-search"></span>
              </button>
            </span>
    	</div>
 	</div>


 <div class="sidebar-menu">
  {{ range .Site.Menus.main }}
    {{ if .HasChildren }}
      <li class="item {{ if $currentPage.IsMenuCurrent "main" . }}active{{ end }}"><a href="{{ .URL }}">{{ .Name }}</a>
        {{ if or ($currentPage.HasMenuCurrent "main" .) ($currentPage.IsMenuCurrent "main" .) }}
          <ul>
            {{ range .Children }}
              <li class="sub-item{{ if $currentPage.IsMenuCurrent "main" . }} active{{ end }}"><a href="{{ .URL }}">{{ .Name }}</a>
                {{ if or ($currentPage.HasMenuCurrent "main" .) ($currentPage.IsMenuCurrent "main" .) }}
                  <ul>
                    {{ range .Children }}
                      <li class="subsub-item{{ if $currentPage.IsMenuCurrent "main" . }} active{{ end }}"><a href="{{ .URL }}">{{ .Name }}</a>
                        {{ if or ($currentPage.HasMenuCurrent "main" .) ($currentPage.IsMenuCurrent "main" .) }}
                          <ul>
                            {{ range .Children }}
                              <li class="subsubsub-item{{ if $currentPage.IsMenuCurrent "main" . }} active{{ end }}"><a href="{{ .URL }}">{{ .Name }}</a></li>
                            {{ end }}
                          </ul>
                        {{ end }}
                      </li>        
                    {{ end }}
                  </ul>
                {{ end }}
              </li>
            {{ end }}
          </ul>
        {{ end }}
      </li>
    {{ end }}
  {{ end }}
 </div>
</ul>