Got callouts about working, simplified markdown setup

resources/js/editor/markdown-parser.js

@@ -0,0 +1,22 @@
+import schema from "./schema";
+import markdownit from "markdown-it";
+import {MarkdownParser, defaultMarkdownParser} from "prosemirror-markdown";
+import {htmlToDoc} from "./util";
+
+const tokens = defaultMarkdownParser.tokens;
+
+// This is really a placeholder on the object to allow the below
+// parser.tokenHandlers.html_block hack to work as desired.
+tokens.html_block = {block: "callout", noCloseToken: true};
+
+const tokenizer = markdownit("commonmark", {html: true});
+const parser = new MarkdownParser(schema, tokenizer, tokens);
+
+parser.tokenHandlers.html_block = function(state, tok, tokens, i) {
+    const contentDoc = htmlToDoc(tok.content || '');
+    for (const node of contentDoc.content.content) {
+        state.addNode(node.type, node.attrs, node.content);
+    }
+};
+
+export default parser;