installDependencies function

bool installDependencies({ List<String> packages = defaultDependencies, ProcessRunner runner = _defaultRunner, })

Adds packages to the Flutter project in the current directory with flutter pub add.

All packages are added in a single call first. If that fails (for example because one package cannot be resolved), each package is retried on its own so one bad package does not block the rest.

Returns true when every package was added. Does nothing and returns false when no pubspec.yaml exists in the current directory.

Implementation

bool installDependencies({
  List<String> packages = defaultDependencies,
  ProcessRunner runner = _defaultRunner,
}) {
  if (!File('pubspec.yaml').existsSync()) {
    logWarning(
      'No pubspec.yaml found in the current directory. '
      'Skipping dependency installation.',
    );
    return false;
  }

  if (packages.isEmpty) {
    return true;
  }

  logInfo('Adding ${packages.length} packages with `flutter pub add`...');

  final ProcessResult batch;
  try {
    batch = runner('flutter', ['pub', 'add', ...packages]);
  } on ProcessException catch (e) {
    logError(
      'Could not run `flutter` (${e.message}). Make sure the Flutter SDK is '
      'on your PATH, then run:\n  flutter pub add ${packages.join(' ')}',
    );
    return false;
  }

  if (batch.exitCode == 0) {
    logSuccess('Dependencies added to pubspec.yaml.');
    return true;
  }

  logWarning('Adding all packages at once failed. Retrying one by one...');

  final failed = <String>[];
  for (final package in packages) {
    final result = runner('flutter', ['pub', 'add', package]);
    if (result.exitCode == 0) {
      logCreate('dependency  $package');
    } else {
      failed.add(package);
      logError('Failed to add $package:\n${result.stderr}'.trimRight());
    }
  }

  if (failed.isEmpty) {
    logSuccess('Dependencies added to pubspec.yaml.');
    return true;
  }

  logWarning(
    'Some packages could not be added: ${failed.join(', ')}. '
    'Add them manually with `flutter pub add <package>`.',
  );
  return false;
}