-

func (s *DistributionService) purge(files []string, logger *logrus.Logger) {
    purge := func(path string) {
        err := s.purger.Purge(path)
        if err != nil {
            logger.WithField("error", err).WithField("path", path).Error("failed to purge path")
        }
    }
    if s.purger != nil && len(files) > 0 {
        paths := make([]string, len(files))
        for i, file := range files {
            if filepath.Ext(file) != "" {
                file, _ = path.Split(file)
            }
            paths[i] = strings.TrimRight(file, "/") + "/"
        }
        sort.Strings(paths)
        lastPath := paths[0]
        purge(lastPath)
        for _, p := range paths[1:] {
            if !strings.HasPrefix(p, lastPath) {
                lastPath = p
                purge(p)
            }
        }
    }
}