feat: mermaid diagram integration (#202)

apps/client/src/features/editor/components/code-block/mermaid-view.tsx

@@ -0,0 +1,50 @@
+import { NodeViewProps } from "@tiptap/react";
+import { useEffect, useState } from "react";
+import mermaid from "mermaid";
+import { v4 as uuidv4 } from "uuid";
+import classes from "./code-block.module.css";
+
+mermaid.initialize({
+  startOnLoad: false,
+  suppressErrorRendering: true,
+});
+
+interface MermaidViewProps {
+  props: NodeViewProps;
+}
+
+export default function MermaidView({ props }: MermaidViewProps) {
+  const { node } = props;
+  const [preview, setPreview] = useState<string>("");
+
+  useEffect(() => {
+    const id = `mermaid-${uuidv4()}`;
+
+    if (node.textContent.length > 0) {
+      mermaid
+        .render(id, node.textContent)
+        .then((item) => {
+          setPreview(item.svg);
+        })
+        .catch((err) => {
+          if (props.editor.isEditable) {
+            setPreview(
+              `<div class="${classes.error}">Mermaid diagram error: ${err}</div>`,
+            );
+          } else {
+            setPreview(
+              `<div class="${classes.error}">Invalid Mermaid Diagram</div>`,
+            );
+          }
+        });
+    }
+  }, [node.textContent]);
+
+  return (
+    <div
+      className={classes.mermaid}
+      contentEditable={false}
+      dangerouslySetInnerHTML={{ __html: preview }}
+    ></div>
+  );
+}