fcu.dart

import 'dart:convert';
import "dart:io";

import 'package:html/dom.dart';
import 'package:html/parser.dart' as parser;
import "package:http/http.dart" as http;
import 'package:http/http.dart';
import "package:yaml/yaml.dart";

main() async {
  File file = new File('pubspec.yaml');
  String yamlString = file.readAsStringSync();
  Map yaml = loadYaml(yamlString);
  YamlMap dependencies = yaml['dependencies'];
//  print(dependencies);

  for (var key in dependencies.keys) {
    var version = dependencies[key];
    if (version is String) {
      var versionNumber = version.replaceFirst('^', '');
      print(key + ': ' + versionNumber);

      Response html = await http.get('https://pub.dev/packages/' + key);

      Document document = parser.parse(html.body);

      var jsonScript =
          document.querySelector('script[type="application/ld+json"]');
      var json = jsonDecode(jsonScript.innerHtml);
//      print(json['version']);
      if (json['version'].toString().compareTo(versionNumber) > 0) {
        print(' => ' + json['version']);
      }
    }
  }
}

flutter pub upgrade to latest version

It reads pubspec.yaml and check for the latest version of each dependency.

Example:
cupertino_icons: 0.1.2
location: 2.3.5
flutter_local_notifications: 0.8.4
http: 0.12.0+1
 => 0.12.0+2
haversine: 1.0.2
flutter_map: 0.1.4
 => 0.7.3
map_native: 0.0.11
url_launcher: 5.1.4
flutter_html_view: 0.5.12
flutter_html: 0.8.2
background_fetch: 0.2.0
 => 0.3.2
package_info: 0.4.0+2
 => 0.4.0+6
liquid_pull_to_refresh: 1.1.1
provider: 3.0.0
 => 3.1.0
yaml: any
google_maps_flutter: 0.5.21+7

@shlima Great upgrade. Thank you.