feat(admonitions): start implementing autoformat

packages/ckeditor5-admonition/src/admonitionautoformat.ts

@@ -0,0 +1,20 @@
+import Plugin from "@ckeditor/ckeditor5-core/src/plugin";
+import Autoformat from "@ckeditor/ckeditor5-autoformat/src/autoformat";
+import blockAutoformatEditing from "@ckeditor/ckeditor5-autoformat/src/blockautoformatediting";
+
+export default class AdmonitionAutoformat extends Plugin {
+	static get requires() {
+		return [ Autoformat ];
+	}
+
+	afterInit() {
+		if (!this.editor.commands.get("admonition")) {
+			return;
+		}
+
+		const instance = (this as any);
+		blockAutoformatEditing(this.editor, instance, /^\!\!\[*\! (.+) $/, (match) => {
+			console.log("Got match ", match);
+		});
+	}
+}