my-site/layouts/partials/base/nav-bar.html

<div class="container clearfix nav-bar">

  {{ define "breadcrumbnav" }}
    {{ if .p1.Parent }}
      <!-- <p>{{ .p1 }} {{ .p2 }}</p> -->
      {{ template "breadcrumbnav" (dict "p1" .p1.Parent "p2" .p2 )  }}
    {{ else if not .p1.IsHome }}
      {{ template "breadcrumbnav" (dict "p1" .p1.Site.Home "p2" .p2 )  }}
    {{ end }}
    <a href="{{ .p1.RelPermalink }}">
      {{ if .p1.IsHome }}~{{ else }}
        {{- replace .p1.Title " " "-" | lower -}}
      {{ end }}</a>
    {{ if ne .p1 .p2 }}
      / 
    {{ end }}
  {{ end }}

  [
  {{ template "breadcrumbnav" (dict "p1" . "p2" .) }}
  ]

  <span class="caret"># _</span>
  <div class="nav-bar-links">
    {{ range .Site.Menus.main }}
      <a href="{{ .URL }}" class="nav-bar-link">{{ .Name }}</a> 
    {{ end }}
  </div>
</div>