[Processing] Delete all folders with only one file

deleteFoldersWithOneFile.pde

String parentFolder = "M:\\INSERT_PARENT_DIR_HERE";

void setup(){
  File tmpDir;
  File fParentFolder = new File(parentFolder);
  println("Scanning " + fParentFolder.getAbsolutePath());
  println("Folder exists: " + fParentFolder.exists());
  File[] folderList = fParentFolder.listFiles();
  println("Number of files/folders: " + folderList.length);
  println("-----------------------------------");
  for(int i=0; i<folderList.length; i++){
    /*
    tmpDir = new File(folderList[i]);
    if(tmpDir.isDirectory() && tmpDir.list().length < 2){
      println("Deleting directory: " + deleteDir(tmpDir));  
    } 
    */
    if(folderList[i].isDirectory() && folderList[i].list().length < 2){
      println("Deleting directory: " + folderList[i].getAbsolutePath() + "\t\t" + deleteDir(folderList[i]));  
    } 
  }
}


// Deletes all files and subdirectories under dir.
// Returns true if all deletions were successful.
// If a deletion fails, the method stops attempting to delete and returns false.
public static boolean deleteDir(File dir) {
    if (dir.isDirectory()) {
        String[] children = dir.list();
        for (int i=0; i<children.length; i++) {
            boolean success = deleteDir(new File(dir, children[i]));
            if (!success) {
                return false;
            }
        }
    }

    // The directory is now empty so delete it
    return dir.delete();
}