include ruff as linter

.gitmodules

+[submodule "ruff"]
+	path = ruff
+	url = https://github.com/astral-sh/ruff/

README.md

@@ -4,8 +4,12 @@ This code is based on https://github.com/Microsoft/monaco-editor-samples/tree/a9
 
 To build, after cloning this repository:
 
+install https://rustwasm.github.io/wasm-pack/installer/
+
+run:
 ```
 npm install
+npm run build:wasm
 npm run build
 ```
 

index.js

 import 'core-js/actual'; // BBB firefox 68
 import "./public-path.js"
 import * as monaco from 'monaco-editor';
+import init, { Workspace } from "./ruff/crates/ruff_wasm/src/pkg";
 
 
+/** @param {monaco.editor.IEditor} editor */
+self.registerRuffDiagnosticProvider = async (editor) => {
+	await init();
+	const workspace = new Workspace()
+	const model = editor.getModel()
+	return model.onDidChangeContent(() => {
+		const diagnostics = workspace.check(model.getValue());
+		editor.setModelMarkers(
+			model,
+			"owner",
+			diagnostics.map((diagnostic) => ({
+				startLineNumber: diagnostic.location.row,
+				startColumn: diagnostic.location.column,
+				endLineNumber: diagnostic.end_location.row,
+				endColumn: diagnostic.end_location.column,
+				message: `${diagnostic.code}: ${diagnostic.message}`,
+				severity: monaco.MarkerSeverity.Error,
+				tags:
+					diagnostic.code === "F401" || diagnostic.code === "F841"
+						? [monaco.MarkerTag.Unnecessary]
+						: [],
+			})),
+		);
+	}
+	);
+}
+
+self.registerRuffCodeActionProvider = () => {
+	monaco.languages.registerCodeActionProvider("python", {
+		provideCodeActions: function (model, position) {
+			const actions = diagnostics
+				.filter((check) => position.startLineNumber === check.location.row)
+				.filter(({ fix }) => fix)
+				.map((check) => ({
+					title: check.fix
+						? check.fix.message
+							? `${check.code}: ${check.fix.message}`
+							: `Fix ${check.code}`
+						: "Fix",
+					id: `fix-${check.code}`,
+					kind: "quickfix",
+					edit: check.fix
+						? {
+								edits: check.fix.edits.map((edit) => ({
+									resource: model.uri,
+									versionId: model.getVersionId(),
+									textEdit: {
+										range: {
+											startLineNumber: edit.location.row,
+											startColumn: edit.location.column,
+											endLineNumber: edit.end_location.row,
+											endColumn: edit.end_location.column,
+										},
+										text: edit.content || "",
+									},
+								})),
+							}
+						: undefined,
+				}));
+			return { actions, dispose: () => {} };
+		},
+	})
+}
+
 self.MonacoEnvironment = {
 	getWorkerUrl: function (moduleId, label) {
 		if (label === 'json') {

package.json

 {
   "name": "monaco-editor-erp5",
   "scripts": {
+    "build:wasm": "wasm-pack -v build ruff/crates/ruff_wasm --target web",
     "build": "webpack --config webpack.config.js",
     "deploy": "node deploy.js"
   },

ruff @ 7b4b0045

+Subproject commit 7b4b0045067b8eb41d0b03d9c3549ce3595373fa