// CSE 143, Summer 2011, Hal Perkins (based on Wi11 version by Marty Stepp)
// Request a filename from the user then print a listing of that file and
// any subdirectories contained in it, recursively.

import java.io.*;     // for File
import java.util.*;   // for Scanner

public class FileCrawler {
    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        System.out.print("Directory to crawl? ");
        String directoryName = console.nextLine();
        
        File f = new File(directoryName);
        crawl(f);
    }
    
    // Prints the given file/directory and any files/directories inside it,
    // starting with zero indentation.
    // Precondition: f != null and f exists
    public static void crawl(File f) {
    	crawl(f, "");
    }
    
    // Print the given file/directory name and any file/directory
    // names inside it with given indent preceding each output line.
    // Precondition: f != null and f exists
    private static void crawl(File f, String indent) {
    	System.out.println(indent + f.getName());
    	if (f.isDirectory()) {
        	// recursive case: directory
        	// print everything in the directory
        	File[] subFiles = f.listFiles();
    		indent += "    ";
        	for (File subfile: subFiles) {
		    crawl(subfile, indent);
        	}
        }
    }
}