static int deleteDirectory_minPathLength = 10;

static void deleteDirectory(File dir) {
  deleteDirectory(dir, false, false);
}

static void deleteDirectory(File dir, boolean verbose, boolean testRun) {
  dir = getCanonicalFile(dir);
  assertTrue(f2s(dir), l(f2s(dir)) >= deleteDirectory_minPathLength);
  File[] files = dir.listFiles();
  if (files == null) return;
  for (File f : files) {
    if (f.isDirectory())
      deleteDirectory(f, verbose, testRun);
    else {
      if (verbose)
        print((testRun ? "Would delete " : "Deleting ") + f.getAbsolutePath());
      if (!testRun)
        f.delete();
    }
  }
  if (verbose) print((testRun ? "Would delete " : "Deleting ") + dir.getAbsolutePath());
  if (!testRun)
    dir.delete();
}