downloadProtoc function

Future<void> downloadProtoc(String version)

Downloads the protoc compiler for version.

Implementation

Future<void> downloadProtoc(String version) async {
  final platformString = {
        'windows': 'win64',
        'macos': 'osx-x86_64',
        'linux': 'linux-x86_64'
      }[Platform.operatingSystem] ??
      'unsupported';
  if (platformString == 'unsupported') throw 'unsupported platform';
  final protocExe = Platform.isWindows ? 'protoc.exe' : 'protoc';
  final downloadUri =
      Uri.parse('https://github.com/protocolbuffers/protobuf/releases/'
          'download/v$version/protoc-$version-$platformString.zip');

  protoc = path.join(compilerDirectory.path, 'bin', protocExe);
  if (await File(protoc).exists()) {
    return;
  }

  stdout.write('${progressBar(0, colorCompleted: penDone)} '
      'downloading dart protoc plugin');
  final bytes = await _getWithProgress(downloadUri, (progress) {
    final bar = progressBar(progress, colorCompleted: penDone);
    stdout
      ..moveFarLeft()
      ..write(bar);
  });
  final bar = progressBar(1.0, colorCompleted: penDone);
  stdout
    ..moveFarLeft()
    ..write(bar);
  stdout.writeln();

  stdout
    ..moveFarLeft()
    ..write('${progressBar(0, colorCompleted: penDone)} uncompressing protoc');
  await unzip(bytes, compilerDirectory.path, progress: (progress) {
    stdout
      ..moveFarLeft()
      ..write(progressBar(progress, colorCompleted: penDone));
  });
  stdout.writeln();

  if (!Platform.isWindows) {
    await Process.run('chmod', ['+x', protoc]);
  }
}