[linting_tool] Add lint rules list (#856)

experimental/linting_tool/lib/model/rules_store.dart

@@ -0,0 +1,44 @@
+// Copyright 2021 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:developer';
+import 'dart:io';
+
+import 'package:flutter/material.dart';
+import 'package:linting_tool/model/rule.dart';
+import 'package:linting_tool/repository/repository.dart';
+
+class RuleStore extends ChangeNotifier {
+  RuleStore() {
+    fetchRules();
+  }
+  bool _isLoading = true;
+
+  bool get isLoading => _isLoading;
+
+  List<Rule> _rules = [];
+
+  List<Rule> get rules => _rules;
+
+  String? _error;
+
+  String? get error => _error;
+
+  Future<void> fetchRules() async {
+    if (!_isLoading) _isLoading = true;
+    notifyListeners();
+    try {
+      var rules = await Repository().getRulesList();
+      _rules = rules;
+    } on SocketException catch (e) {
+      log(e.toString());
+      _error = 'Check internet connection.';
+    } on Exception catch (e) {
+      log(e.toString());
+    }
+    _isLoading = false;
+
+    notifyListeners();
+  }
+}