sclass DeleteFilesDialog {
  settable S title = "Delete files";
  new LinkedHashSet<File> filesToDelete;
  
  *() {}
  *(S *title) {}

  selfType wholeDirectory(File dir) {
    if (!isDirectory(dir)) this;
    filesToDelete.addAll(reversed(findAllFiles(dir)));
    filesToDelete.add(dir);
    this;
  }
  
  void show {
    renameSubmitButton("DELETE " + upper(nFiles(filesToDelete)),
      showFormTitled3(title,
        "Files to delete", jscroll(uneditableTextArea(lines(filesToDelete))),
        null, rThread doIt).visualize());
  }
  
  void doIt {
    int successes = 0;
    for (File f : filesToDelete)
      if (deleteFile(f)) {
        print("DELETED: " + f);
        ++successes;
      } else
        print("COULDN'T DELETE: " + f);
    int failures = l(filesToDelete)-successes;
    
    S msg = "Deleted " + nFiles(successes);
    if (failures == 0)
      infoBox(msg);
    else
      messageBox(msg + ", but couldn't delete " + n2(failures));
  }
}