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static bool dir2zip_recurse_honorDontBackupFiles_verbose;

static int dir2zip_recurse_honorDontBackupFiles(File inDir, File zip) {
  ret dir2zip_recurse_honorDontBackupFiles(inDir, zip, "");
}

// automatically adds a dummy file (empty.txt) in case there are no files to zip
static int dir2zip_recurse_honorDontBackupFiles(File inDir, File zip, String outPrefix) ctex {
  mkdirsForFile(zip);
  FileOutputStream fout = newFileOutputStream(zip);
  ZipOutputStream outZip = new ZipOutputStream(fout);
  try {
    int count = dir2zip_recurse_honorDontBackupFiles(inDir, outZip, outPrefix, 0);
    if (count == 0)
      zip_addDummyFile(outZip);
    ret count;
  } finally {
    outZip.close();
  }
}

static int dir2zip_recurse_honorDontBackupFiles(File inDir, ZipOutputStream outZip) {
  ret dir2zip_recurse_honorDontBackupFiles(inDir, outZip, "", 0);
}

static int dir2zip_recurse_honorDontBackupFiles(File inDir, ZipOutputStream outZip, String outPrefix, int level) ctex {
  if (++level >= 20) fail("woot? 20 levels in zip?");
  
  Set<S> dontBackup = asSet(lines(loadTextFile(newFile(inDir, standardNameOfDontBackupFile()))));
  
  new L<File> files;
  for (File f : listFiles(inDir))
    if (!contains(dontBackup, f.getName()))
      files.add(f);

  int n = 0;
  sortFilesByName(files);
  for (File f : files) {
    if (f.isDirectory()) {
      print("dir2zip_recurse_honorDontBackupFiles: Scanning " + f.getAbsolutePath());
      n += dir2zip_recurse_honorDontBackupFiles(f, outZip, outPrefix + f.getName() + "/", level);
    } else {
      if (dir2zip_recurse_honorDontBackupFiles_verbose) print("Copying " + f.getName());
      outZip.putNextEntry(new ZipEntry(outPrefix + f.getName()));
      InputStream fin = new FileInputStream(f);
      copyStream(fin, outZip);
      fin.close();
      ++n;
    }
  }
  return n;
}