pipe static method

Implementation

static Future<String> pipe(List<Process> processList) async {
  if (processList.isEmpty) {
  } else if (processList.length == 1) {
    return '';
  }

  for (var index = 1; index <= processList.length - 1; index++) {
    processList[index - 1].stdout.pipe(processList[index].stdin);
  }

  if (await processList.last.exitCode != 0) {
    throw Exception(
        'Error: ${await processList.last.stderr.transform(utf8.decoder).join()}');
  }

  final result = await processList.last.stdout.transform(utf8.decoder).join();

  return result;
}