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 '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
+ * @param {object} config the config, following https://raw.githubusercontent.com/charliermarsh/ruff/main/ruff.schema.json
+ * @returns {Disposable}
+ */
+self.registerRuffDiagnosticProvider = async (editor, config) => {
+	await init();
+	const workspace = new Workspace(config)
+	const model = editor.getModel()
+	let codeActionProviderDisposable;
+
+	return model.onDidChangeContent(() => {
+		const diagnostics = workspace.check(model.getValue());
+		codeActionProviderDisposable?.dispose();
+		codeActionProviderDisposable = 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: () => {} };
+			},
+		});
+
+		monaco.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.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