hugo-geekblog/layouts/shortcodes/mermaid.html

{{ if not (.Page.Scratch.Get "mermaid") }}
  <!-- Include mermaid only first time --><script defer src="{{ index (index .Site.Data.assets "mermaid.js") "src" | relURL }}"></script>
  {{ .Page.Scratch.Set "mermaid" true }}
{{ end }}


<pre class="gblog-mermaid mermaid {{ with .Get "class" }}{{ . }}{{ end }}">
  {{- .Inner -}}
</pre>