!7

static Map<O, Long> wsToState = weakHashMap();
static int interval = 200, initialChars = 65536;
static long timeout = 10*60000L; // larger timeout since we have no idle mechanism yet (todo)

static File fileToLog() { ret mechVersionsLog(); }

p {
  initWebSockets();
  doEvery(interval, f update);
}

html { ret "Use WebSocket: " + subBot_myWebSocketURI(); }

svoid update {
  if (webSocketManager.isEmpty()) ret;
  File f = fileToLog();
  long len = fileSize(f);
  
  for (O ws : webSocketManager.webSockets()) {
    Long l = wsToState.get(ws);
    if (l == null) { // new WebSocket
      set(ws, 'timeout, timeout);
      wsToState.put(ws, l = max(0, len-initialChars)); // TODO
      call(ws, 'send, 'clear);
    }
    if (len > l) {
      S newStuff = unquoteAllLines(loadTextFilePart(f, l, len));
      wsToState.put(ws, len);
      call(ws, 'send, "+" + newStuff);
    }
  }
}