feat: better preview for math and mermaid

layouts/partials/mermaid_support.html

@@ -0,0 +1,24 @@
+{{ partial "resource.html" (dict "context" . "type" "js" "filename" "js/load-mermaid.js") }}
+
+{{ $colorTheme := "light" }}
+{{ if and (site.Params.colortheme) (ne site.Params.colortheme "") }}
+{{ $colorTheme = site.Params.colortheme | lower }}
+{{ end }}
+
+<script type="module">
+    function detectCurrentScheme3() {
+        const defaultTheme = "{{ $colorTheme }}";
+        if (localStorage !== null && localStorage.getItem("user-color-scheme")) {
+            return localStorage.getItem("user-color-scheme");
+        }
+        if (defaultTheme === "dark" || defaultTheme === "light") {
+            return defaultTheme;
+        }
+        return window.matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light";
+    }
+
+    import mermaid from 'https://cdn.jsdelivr.net/npm/mermaid/dist/mermaid.esm.min.mjs';
+    window.mermaid = mermaid;
+    window.initMermaid()
+    document.body.dispatchEvent(new CustomEvent(detectCurrentScheme3() + "-theme-set"));
+</script>

layouts/partials/post-summary.html

@@ -34,6 +34,14 @@
             <a class="u-url" href="{{ .RelPermalink }}">{{ i18n "readMore" }}</a>
         </div>
     {{ end }}
+    
+    {{ if .Store.Get "hasMermaid" }}
+        {{ partial "mermaid_support.html" . }}
+    {{ end }}
+    
+    {{ if .Params.math }}
+        {{ partial "mathjax_support.html" . }}
+    {{ end }}
 
     {{ partial "post-info.html" . }}
 </article>