// CSE 143, winter 2012
// Prints contents of directories using indentation to indicate 
// nesting.  Example:
//   lol cats
//      cs
//         hex.jpeg
//         recursive.jpeg
//      sangwich.jpeg
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 given file or directory and any files or directories
	// inside it, starting with 0 indentation.
	public static void print(File f) {
		print(f, "");
	}

	// Prints the given file or directory and any files or directories
	// inside it at the given level of indentation.
	// This is an example of a recursive helper method.
	// Pre: f != null && f.exists()
	private static void print(File f, String indent) {
		System.out.println(indent + f.getName());
		if (f.isDirectory()) {
			File[] contents = f.listFiles();
			for (int i = 0; i < contents.length; i++) {
				print(contents[i], indent + "   ");
			}
		}
		// base case: just stop!
	}
}