findEngineArtifactsDir function

Uri findEngineArtifactsDir({ String? dartPath, })

Locate the engine artifacts cache directory in the Flutter SDK.

Implementation

Uri findEngineArtifactsDir({String? dartPath}) {
  // Could be:
  //   `/path/to/flutter/bin/cache/dart-sdk/bin/dart`
  //   `/path/to/flutter/bin/cache/artifacts/engine/darwin-x64/flutter_tester`
  //   `/path/to/.puro/shared/caches/94cf8c8fad31206e440611e309757a5a9b3be712/dart-sdk/bin/dart`
  final Uri dartExec = Uri.file(dartPath ?? Platform.resolvedExecutable);
  logger.info('Dart executable: `${dartExec.toFilePath()}`');

  Uri? cacheDir;
  // Search backwards through the segment list until finding `bin` and `cache` in sequence.
  for (var i = dartExec.pathSegments.length - 1; i >= 0; i--) {
    if (dartExec.pathSegments[i] == 'dart-sdk' ||
        dartExec.pathSegments[i] == 'artifacts') {
      // Note: The final empty string denotes that this is a directory path.
      cacheDir = dartExec.replace(
        pathSegments: dartExec.pathSegments.sublist(0, i) + [''],
      );
      break;
    }
  }
  if (cacheDir == null) {
    throw Exception(
      'Unable to find Flutter SDK cache directory! Dart executable: `${dartExec.toFilePath()}`',
    );
  }
  // We should now have a path of `/path/to/flutter/bin/cache/`.

  final engineArtifactsDir = cacheDir.resolve(
    './artifacts/engine/',
  ); // Note: The final slash is important.
  logger.info(
    'Flutter SDK cache directory: `${engineArtifactsDir.toFilePath()}`',
  );

  return engineArtifactsDir;
}