@Override
    protected @Nullable VcsRevisionNumber calcCurrentRevisionNumber() {
      try {
        return GitHistoryUtils.getCurrentRevision(myProject, myFilePath, "HEAD");
      }
      catch (VcsException e) {
        // likely the file is not under VCS anymore.
        if (LOG.isDebugEnabled()) {
          LOG.debug("Unable to retrieve the current revision number", e);
        }
        return null;
      }
    }
@Override
    protected @Nullable VcsRevisionNumber calcCurrentRevisionNumber()