alps/themes/sourcehut/nav.html

<nav class="container-fluid navbar navbar-light navbar-expand-sm">
  <a class="navbar-brand" href="/">
    alps
    <span class="text-danger">mail</span>
  </a>
  {{ if .LoggedIn }}
    {{ $page := (index .Path 0) }}
    <ul class="navbar-nav mr-auto d-none d-sm-flex">
      <li class="nav-item
      {{ if or (eq $page "mailbox") (eq $page "message") (eq $page "compose") }}
      active
      {{ end }}
      ">
        <a href="/" class="nav-link">mail</a>
      </li>
      {{ if call .HavePlugin "carddav" }}
      <li class="nav-item
      {{ if eq $page "contacts" }}
      active
      {{ end }}
      ">
        <a href="/contacts" class="nav-link">contacts</a>
      </li>
      {{ end }}
      {{ if call .HavePlugin "caldav" }}
      <li class="nav-item
      {{ if eq $page "calendar" }}
      active
      {{ end }}
      ">
        <a href="/calendar" class="nav-link">calendar</a>
      </li>
      {{ end }}
    </ul>
    <div class="login">
      <span class="navbar-text">
        Logged in as {{ .Username }} —
        <a href="/settings">Settings</a>
        —
        <a href="/logout">Log out</a>
      </span>
    </div>
  {{ end }}
</nav>