Calendar: Link to first URL from description

themes/ccchh/layouts/shortcodes/calendar-table.html

@@ -13,7 +13,12 @@
     <tr>
       {{- $start := time .dtstart }}
       <td style="font-variant-numeric: tabular-nums;">{{ $start.Local.Format "Mon, 2006-01-02 15:04" }}</td>
+      {{- $potentialUrl := index (findRE `https?://\S*` .description 1) 0 }}
+      {{- if eq $potentialUrl nil }}
       <td>{{ .summary }}</td>
+      {{- else }}
+      <td><a href="{{ $potentialUrl }}">{{ .summary }}</a></td>
+      {{- end }}
       <td>{{ .location }}</td>
     </tr>
     {{- end }}