static java.util.Timer calcOnConceptChangesInOtherProgram(fS programID, int delay, final O runnable, final bool runOnFirstTime) {
  final File conceptsFile = conceptsFile(programID);
  
  ret doEvery_daemon(delay, 0, new Runnable {
    FileStatus status = runOnFirstTime ? null : fileStatus(conceptsFile);
    new SingleThread thread;
    
    public void run() {
      FileStatus s = fileStatus(conceptsFile);
      if (neq(s, status) && !thread.running()) {
        status = s;
        thread.go(runnable);
      }
    }
  });
}

Began life as a copy of #1009268