Integrate mermaid

layouts/_default/_markup/render-codeblock-mermaid.html

@@ -0,0 +1,4 @@
+<pre class="mermaid">
+  {{- .Inner | safeHTML }}
+</pre>
+{{ .Page.Store.Set "hasMermaid" true }}

layouts/partials/javascript.html

@@ -9,3 +9,28 @@
         <script src="{{ $val }}"></script>
     {{ end }}
 {{ end }}
+{{ if .Page.Store.Get "hasMermaid" }}
+<script type="module">
+    import mermaid from 'https://cdn.jsdelivr.net/npm/mermaid/dist/mermaid.esm.min.mjs';
+    const settings = localStorage.getItem('theme') === 'dark' ?
+        {
+            startOnLoad: true,
+            theme: 'dark',
+            darkMode: true,
+            themeVariables: {
+                tertiaryColor: '#dee3ed'
+            }
+        }
+        :
+        {
+            startOnLoad: true,
+            theme: 'base',
+            darkMode: false,
+            themeVariables: {
+                tertiaryColor: '#dee3ed'
+            }
+        }
+    ;
+    mermaid.initialize(settings);
+</script>
+{{ end }}