gitChangedDartFiles function

List<String> gitChangedDartFiles(String repoPath, String ref)

Returns the list of .dart files changed between ref and HEAD in the repository at repoPath.

Uses --diff-filter=ACMR (Added, Copied, Modified, Renamed) with -M for rename detection, so renamed files report their new path. Returns an empty list when the ref is invalid or git is not available. Throws ProcessException on unexpected git failures.

Implementation

List<String> gitChangedDartFiles(String repoPath, String ref) {
  // Run git from the repo root so paths are repo-relative.
  final result = Process.runSync('git', [
    'diff',
    '--name-only',
    '--diff-filter=ACMR',
    '-M',
    '$ref..HEAD',
    '--',
    '*.dart',
  ], workingDirectory: repoPath);

  if (result.exitCode != 0) {
    final stderr = (result.stderr as String).trim();
    // Invalid ref or not a git repo — return empty rather than crashing.
    if (stderr.contains('unknown revision') ||
        stderr.contains('not a git repository')) {
      return [];
    }
    throw ProcessException(
      'git',
      ['diff', '--name-only', ref],
      stderr,
      result.exitCode,
    );
  }

  final stdout = (result.stdout as String).trim();
  if (stdout.isEmpty) return [];

  // Resolve repo-relative paths to absolute so the scan engine matches
  // them against its own file discovery.
  return stdout
      .split('\n')
      .where((line) => line.trim().isNotEmpty)
      .map((line) => p.normalize(p.join(repoPath, line.trim())))
      .toList();
}