func NewFileSystemIndexer()

in packages/packages.go [106:141]
31 lines of code
5 McCabe index (conditional complexity)

func NewFileSystemIndexer(logger *zap.Logger, paths ...string) *FileSystemIndexer {
	walkerFn := func(basePath, path string, info os.DirEntry) (bool, error) {
		relativePath, err := filepath.Rel(basePath, path)
		if err != nil {
			return false, err
		}

		dirs := strings.Split(relativePath, string(filepath.Separator))
		if len(dirs) < 2 {
			return false, nil // need to go to the package version level
		}

		if info.IsDir() {
			versionDir := dirs[1]
			_, err := semver.StrictNewVersion(versionDir)
			if err != nil {
				logger.Warn("ignoring unexpected directory",
					zap.String("file.path", path))
				return false, filepath.SkipDir
			}
			return true, nil
		}
		// Unexpected file, return nil in order to continue processing sibling directories
		// Fixes an annoying problem when the .DS_Store file is left behind and the package
		// is not loading without any error information
		logger.Warn("ignoring unexpected file", zap.String("file.path", path))
		return false, nil
	}
	return &FileSystemIndexer{
		paths:     paths,
		label:     "FileSystemIndexer",
		walkerFn:  walkerFn,
		fsBuilder: ExtractedFileSystemBuilder,
		logger:    logger,
	}
}