!7

import java.nio.file.*;
import static java.nio.file.StandardWatchEventKinds.*;

p {
  File dir = programDir();
  deleteAllProgramFiles();
  makeProgramDir();
  final Path path = dir.toPath();
  
  WatchService watchService = FileSystems.getDefault().newWatchService();
  final WatchKey watchKey = path.register(watchService, ENTRY_CREATE, ENTRY_DELETE, ENTRY_MODIFY, OVERFLOW);
  
  thread {
    sleepSeconds(2);
    saveProgramTextFile("bla", "1");
  }
  
  while licensed {
    final WatchKey wk = watchService.take();
    print("Key taken");
    
    for (WatchEvent<?> event : wk.pollEvents()) pcall {
      final Path changed = (Path) event.context();
      print("Changed: " + changed);
    }
    
    bool valid = wk.reset();
    if (!valid)
      print("Key has been unregistered");
  }
}