Future _stripAndAugmentPubspecYaml()

in lib/src/sdk_env.dart [446:487]
33 lines of code
10 McCabe index (conditional complexity)

  Future<File> _stripAndAugmentPubspecYaml(String packageDir) async {
    final now = DateTime.now();
    final backup = File(
        p.join(packageDir, 'pana-${now.millisecondsSinceEpoch}-pubspec.yaml'));

    final pubspec = File(p.join(packageDir, 'pubspec.yaml'));
    final original = await pubspec.readAsString();
    final parsed = yamlToJson(original) ?? <String, dynamic>{};
    parsed.remove('dev_dependencies');
    parsed.remove('dependency_overrides');

    // `pub` client checks if pubspec.yaml has no lower-bound SDK constraint,
    // and throws an exception if it is missing. While we no longer accept
    // new packages without such constraint, the old versions are still valid
    // and should be analyzed.
    final environment = parsed.putIfAbsent('environment', () => {});
    if (environment is Map) {
      VersionConstraint? vc;
      if (environment['sdk'] is String) {
        try {
          vc = VersionConstraint.parse(environment['sdk'] as String);
        } catch (_) {}
      }
      final range = vc is VersionRange ? vc : null;
      if (range != null &&
          range.min != null &&
          !range.min!.isAny &&
          !range.min!.isEmpty) {
        // looks good
      } else {
        final maxValue = range?.max == null
            ? '<=${_runtimeInfo!.sdkVersion}'
            : '${range!.includeMax ? '<=' : '<'}${range.max}';
        environment['sdk'] = '>=1.0.0 $maxValue';
      }
    }

    await pubspec.rename(backup.path);
    await pubspec.writeAsString(json.encode(parsed));

    return backup;
  }