// Helene Martin, CSE 143
// Recursively crawls a directory structure.

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

public class Crawler {
	public static void main(String[] args) {
		Scanner console = new Scanner(System.in);
		System.out.print("directory or file name? ");
		String name = console.nextLine();
		File f = new File(name);
		if (!f.exists()) {
			System.out.println("That file or directory does not exist");
		} else {
			print(f);
		}
	}

	// Prints the name of the given file. If the file is a directory,
	// recursively prints its content.  The given file is printed at
	// 0 intendation.
	// pre: f != null and f.exists()
	public static void print(File f) {
		print(f, 0);
	}

	// Prints the name of the given file. If the file is a directory,
	// recursively prints its content.  Displays the name of each file
	// at the specified indentation level.
	// pre: f != null and f.exists()
	private static void print(File f, int indent) {
		for (int i = 0; i < indent; i++) {
			System.out.print("    ");
		}
		System.out.println(f.getName());

		if (f.isDirectory()) {
			File[] files = f.listFiles();
			for (int i = 0; i < files.length; i++) {
				print(files[i], indent + 1);
			}
		}
	}
}