createBackupStash method

Implementation

Future<String?> createBackupStash() async {
  // ensure there are staged files
  final staged =
      await Process.run('git', ['diff', '--cached', '--name-only']);

  final hasFiles = switch (staged.stdout) {
    final String files => files.trim().isNotEmpty,
    _ => false,
  };

  if (!hasFiles) {
    return null;
  }

  final result = await Process.run('git', [
    'stash',
    'create',
    backupStashMessage,
  ]);

  final hash = switch (result.stdout) {
    final String hash => hash.trim(),
    _ => null,
  };

  if (hash == null) {
    logger
      ..err('Failed to create stash')
      ..detail('Error: ${result.stderr}');
    throw Exception('Failed to create stash');
  }

  // dart is running too fast for git to cache the stash,
  // resulting in a error throwing race condition
  await Future<void>.delayed(const Duration(milliseconds: 100));

  final storeResult = await Process.run(
    'git',
    [
      'stash',
      'store',
      '--message',
      '"$_stashMessage"',
      hash,
    ],
  );

  if (storeResult.exitCode != 0) {
    logger
      ..err('Failed to store stash')
      ..detail('Error: ${storeResult.stderr}');
    throw Exception('Failed to store stash');
  }

  return hash;
}