feat: style of home and notification screen

lib/utils/github.dart

@@ -0,0 +1,72 @@
+import 'dart:convert';
+import 'dart:async';
+import 'dart:io';
+import 'package:http/http.dart' as http;
+import 'package:github/server.dart';
+export 'package:github/server.dart';
+import '../token.dart';
+
+var ghClient = createGitHubClient(auth: Authentication.withToken(token));
+
+final prefix = 'https://api.github.com';
+final endpoint = '/graphql';
+
+Future<dynamic> getWithCredentials(String url) async {
+  final res = await http.get(
+    prefix + url,
+    headers: {HttpHeaders.authorizationHeader: 'token $token'},
+  );
+  final data = json.decode(res.body);
+  return data;
+}
+
+Future<dynamic> postWithCredentials(String url, String body) async {
+  final res = await http.post(
+    prefix + url,
+    headers: {HttpHeaders.authorizationHeader: 'token $token'},
+    body: body,
+  );
+  final data = json.decode(res.body);
+  return data;
+}
+
+Future<dynamic> query(String query) async {
+  final data =
+      await postWithCredentials('/graphql', json.encode({'query': query}));
+  if (data['errors'] != null) {
+    throw new Exception(data['errors'].toString());
+  }
+  print(data);
+  return data['data'];
+}
+
+Future<List<Event>> fetchEvents(int page) async {
+  List data = await getWithCredentials(
+    '/users/pd4d10/received_events/public?page=$page',
+  );
+  return data.map<Event>((item) => Event.fromJSON(item)).toList();
+}
+
+class NotificationGroup {
+  String fullName;
+  List<Notification> items = [];
+
+  NotificationGroup(this.fullName);
+}
+
+Future<List<NotificationGroup>> fetchNotifications([int index = 0]) async {
+  var data = await ghClient.activity
+      .listNotifications(all: index == 2, participating: index == 1)
+      .toList();
+
+  Map<String, NotificationGroup> groupMap = {};
+  data.forEach((item) {
+    String repo = item.repository.fullName;
+    if (groupMap[repo] == null) {
+      groupMap[repo] = NotificationGroup(repo);
+    }
+
+    groupMap[repo].items.add(item);
+  });
+  return groupMap.values.toList();
+}