better post metadata

layouts/_default/single.html

@@ -2,8 +2,12 @@
 
 <article>
   <header>
-    <h1><a href="{{ .Permalink }}">{{ .Title }}</a></h1>
-    {{ if .Date }}<p class="meta"><time datetime="{{ .Date.Format "2006-01-02T15:04:05Z07:00" }}">{{ .Date.Format "January 02, 2006" }}</time></p>{{ end }}
+    {{ range $index, $tag := .Params.categories }}
+      {{- if gt $index 0 }}, {{ end -}}
+      <a href="{{ ($.Site.GetPage (printf "/%s/%s" "categories" $tag)).Permalink }}">{{ $tag | upper }}</a>
+    {{- end -}}
+    <h1>{{ .Title }}</h1>
+    <p>{{ if ($.Param "author") }}{{ $.Param "author" }}{{ end }}{{ if .Date }}<time datetime="{{ .Date.Format "2006-01-02T15:04:05Z07:00" }}">{{ if ($.Param "author") }} | {{ end }}{{ .Date.Format "January 02, 2006" }}</time>{{ end }}</p>
   </header>
   {{ .Content }}
 </article>