Add autoformat support

src/autoformatmath.js

@@ -0,0 +1,38 @@
+import Plugin from '@ckeditor/ckeditor5-core/src/plugin';
+import Autoformat from '@ckeditor/ckeditor5-autoformat/src/autoformat';
+import blockAutoformatEditing from '@ckeditor/ckeditor5-autoformat/src/blockautoformatediting';
+
+import Math from './math';
+
+export default class AutoformatMath extends Plugin {
+	static get requires() {
+		return [ Math, Autoformat ];
+	}
+
+	afterInit() {
+		const editor = this.editor;
+		const command = editor.commands.get( 'math' );
+
+		if ( command ) {
+			const mathBlockCallback = getCallbackFunctionForBlockAutoformat( editor, command );
+
+			blockAutoformatEditing( editor, this, /^\\\[$/, mathBlockCallback );
+			blockAutoformatEditing( editor, this, /^\$\$$/, mathBlockCallback );
+		}
+	}
+
+	static get pluginName() {
+		return 'AutoformatMath';
+	}
+}
+
+function getCallbackFunctionForBlockAutoformat( editor, command ) {
+	return () => {
+		if ( !command.isEnabled ) {
+			return false;
+		}
+
+		command.display = true;
+		editor.plugins.get( 'MathUI' )._showUI();
+	}
+}