sourcehut theme: show only loaded plugin links and and mark current active plugin name

Signed-off-by: Alexey Terentyev <axifnx@gmail.com>

themes/sourcehut/nav.html

@@ -1,29 +1,44 @@
 <nav class="container-fluid navbar navbar-light navbar-expand-sm">
-  <!-- TODO: show active plugin name -->
   <a class="navbar-brand" href="/">
     alps
     <span class="text-danger">mail</span>
   </a>
-  {{if .LoggedIn}}
+  {{ if .LoggedIn }}
+    {{ $page := (index .Path 0) }}
     <ul class="navbar-nav mr-auto d-none d-sm-flex">
-      <li class="nav-item active">
+      <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>
-      <!-- TODO: only show these links if plugins are loaded -->
+      {{ if call .HavePlugin "carddav" }}
-      <li class="nav-item">
+      <li class="nav-item
+      {{ if eq $page "contacts" }}
+      active
+      {{ end }}
+      ">
         <a href="/contacts" class="nav-link">contacts</a>
       </li>
-      <li class="nav-item">
+      {{ 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}} —
+        Logged in as {{ .Username }} —
         <a href="/settings">Settings</a>
         —
         <a href="/logout">Log out</a>
       </span>
     </div>
-  {{end}}
+  {{ end }}
 </nav>