static CloseableItIt<S> linesFromFile(File f) ctex {
  if (!f.exists()) ret emptyCloseableIterableIterator();
  ifndef NoAutoGunzip
  if (ewic(f.getName(), ".gz"))
    ret linesFromReader(utf8bufferedReader(newGZIPInputStream(f)));
  endifndef
  ret linesFromReader(utf8bufferedReader(f));
}

static CloseableItIt<S> linesFromFile(S path) {
  ret linesFromFile(newFile(path));
}