Recursively copy a directory in Dart by running CMD/Bash commands. Uses robocopy on Windows and cp on Mac/*NIX.

copy_directory.dart

Future<bool> copy(Directory source, Directory destination) async {
  String processName = Platform.isWindows ? "robocopy" : "cp";
  List <String> args;
  if (Platform.isWindows)
    args = [source.absolute.path, destination.absolute.path, '/E', '/B'];
  else
    args = ['-r', source.absolute.path, destination.absolute.path];
  Process cp = await Process.start(processName, args);
  cp.stdout.listen(null); // For some reason, robocopy won't copy directories unless you listen to stdout
  stderr.addStream(cp.stderr);
  int code = await cp.exitCode;
  return (Platform.isWindows && code <= 1) ||
      (!Platform.isWindows && code == 0);
}