Implements default lints page (#871)

experimental/linting_tool/lib/model/rules_store.dart

@@ -6,6 +6,7 @@ import 'dart:developer';
 import 'dart:io';
 
 import 'package:flutter/material.dart';
+import 'package:linting_tool/model/profile.dart';
 import 'package:linting_tool/model/rule.dart';
 import 'package:linting_tool/repository/repository.dart';
 import 'package:http/http.dart' as http;
@@ -29,6 +30,27 @@ class RuleStore extends ChangeNotifier {
 
   String? get error => _error;
 
+  List<RulesProfile> get defaultProfiles {
+    List<RulesProfile> _defaultProfiles = [];
+
+    var rulesWithDefaultSets =
+        rules.where((rule) => rule.sets.isNotEmpty).toList();
+
+    for (final rule in rulesWithDefaultSets) {
+      for (final setName in rule.sets) {
+        var profileIndex =
+            _defaultProfiles.indexWhere((profile) => profile.name == setName);
+        if (profileIndex >= 0) {
+          _defaultProfiles[profileIndex].rules.add(rule);
+        } else {
+          _defaultProfiles.add(RulesProfile(name: setName, rules: [rule]));
+        }
+      }
+    }
+
+    return _defaultProfiles;
+  }
+
   Future<void> fetchRules() async {
     if (!_isLoading) _isLoading = true;
     notifyListeners();

experimental/linting_tool/lib/pages/default_lints_page.dart

@@ -3,13 +3,82 @@
 // found in the LICENSE file.
 
 import 'package:flutter/material.dart';
+import 'package:linting_tool/layout/adaptive.dart';
+import 'package:linting_tool/model/rules_store.dart';
+import 'package:linting_tool/pages/rules_page.dart';
+import 'package:linting_tool/theme/colors.dart';
+import 'package:provider/provider.dart';
 
 class DefaultLintsPage extends StatelessWidget {
   const DefaultLintsPage({Key? key}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
-    // TODO(abd99): Implement DefaultLintsPage, showing a list of default lint rules.
-    return const Text('Default Profiles');
+    return Consumer<RuleStore>(
+      builder: (context, rulesStore, child) {
+        if (rulesStore.isLoading) {
+          return const CircularProgressIndicator.adaptive();
+        }
+
+        if (rulesStore.defaultProfiles.isNotEmpty) {
+          var defaultSets = rulesStore.defaultProfiles;
+          final isDesktop = isDisplayLarge(context);
+          final isTablet = isDisplayMedium(context);
+          final startPadding = isTablet
+              ? 60.0
+              : isDesktop
+                  ? 120.0
+                  : 4.0;
+          final endPadding = isTablet
+              ? 60.0
+              : isDesktop
+                  ? 120.0
+                  : 4.0;
+
+          return ListView.separated(
+            padding: EdgeInsetsDirectional.only(
+              start: startPadding,
+              end: endPadding,
+              top: isDesktop ? 28 : 0,
+              bottom: isDesktop ? kToolbarHeight : 0,
+            ),
+            cacheExtent: 5,
+            itemCount: defaultSets.length,
+            itemBuilder: (context, index) {
+              var profile = rulesStore.defaultProfiles[index];
+              return ListTile(
+                title: Text(
+                  profile.name,
+                ),
+                tileColor: AppColors.white50,
+                onTap: () {
+                  Navigator.push<void>(
+                    context,
+                    MaterialPageRoute(
+                      builder: (context) => RulesPage(profile: profile),
+                    ),
+                  );
+                },
+              );
+            },
+            separatorBuilder: (context, index) => const SizedBox(height: 4),
+          );
+        }
+
+        return Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: [
+            Text(rulesStore.error ?? 'Failed to load rules.'),
+            const SizedBox(
+              height: 16.0,
+            ),
+            IconButton(
+              onPressed: () => rulesStore.fetchRules(),
+              icon: const Icon(Icons.refresh),
+            ),
+          ],
+        );
+      },
+    );
   }
 }