{{ define "main" }}
  {{ .Content }}
  {{ $postsDir := .Site.Params.Posts | default (slice "posts" "post") }}
  {{ $allPostsList := where (where site.RegularPages "Section" "in" $postsDir) "Section" "!=" "" }}
  <p>posts:</p>
  <ul>
  {{ range $allPostsList }}
  <li><a class="title" href="{{ .RelPermalink }}">{{ .LinkTitle }}</a></li>
  {{ end }}
  </ul>
{{ end }}