feat: diagram rendering + post-processor (wip)

server/modules/rendering/markdown-core/renderer.js

@@ -27,7 +27,11 @@ module.exports = {
       typographer: this.config.typographer,
       quotes: _.get(quoteStyles, this.config.quotes, quoteStyles.English),
       highlight(str, lang) {
-        return `<pre><code class="language-${lang}">${_.escape(str)}</code></pre>`
+        if (lang === 'diagram') {
+          return `<pre class="diagram">` + Buffer.from(str, 'base64').toString() + `</pre>`
+        } else {
+          return `<pre><code class="language-${lang}">${_.escape(str)}</code></pre>`
+        }
       }
     })