import java.io.*;
import java.util.*;

public class Leerstellenvernichter extends Thread
{

	public static int mode = 0;
	public static boolean output = false;
	public static int scale = 100;

	public static void main(String[] args)
	{
		(new Leerstellenvernichter(new File(args[0]))).start();
		if (args.length > 1 && args[1].equals("delete")) mode = 1;
		if (args.length > 2 && args[2].startsWith("scale=")) scale = Integer.valueOf(args[2].split("=")[1]);
	}

	File root;

	public Leerstellenvernichter(File path)
	{
		this.root = path;
		System.out.println(path.getAbsolutePath());
	}

	public void out(String s)
	{
		if (output) System.out.println(s);
	}

	@Override
	public void run()
	{
		try
		{
			if (root.listFiles().length == 0) root.delete();
			else
			{
				int i = 0;
				for(; i <= root.listFiles().length / scale; i++)
				{
					(new Checker(Arrays.copyOfRange(root.listFiles(), i * scale, (i + 1) * scale))).run();;
				}

				if (root.listFiles().length == 0) root.delete();
			}
		} catch (Exception e)
		{
			e.printStackTrace();
		}
	}

	class Checker extends Thread
	{

		File[] array;

		public Checker(File[] array)
		{
			this.array = array;
		}

		@Override
		public void run()
		{
			for (File f : array)
			{
				if(f == null) continue;
				if (f.isDirectory()) (new Leerstellenvernichter(f)).run();
				else if (f.isFile())
				{
					boolean b = true;
					Scanner scan;
					try
					{
						scan = new Scanner(f);

						while (scan.hasNext())
							if (!scan.nextLine().matches(" *"))
							{
								b = false;
								break;
							}
						scan.close();
						if (b)
						{
							if (Leerstellenvernichter.mode == 0)
							{
								String s = f.getAbsolutePath();
								s = s.substring(0, s.lastIndexOf("\\") + 1);
								s += "_" + f.getName();
								f.renameTo(new File(s));
							} else if (Leerstellenvernichter.mode == 1) if (f.delete()) System.out.println("deleted " + f.getAbsolutePath());
						}
					} catch (FileNotFoundException e)
					{
						e.printStackTrace();
					}
				}
			}
		}

	}

}