// CSE 143, Winter 2009, Marty Stepp
// This program contains a recursive file/directory-crawling method.

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.
    // Precondition: f != null
    // "public / private pair"
    // public version: has the parameter(s) that the clients want to pass
    public static void crawl(File f) {
        crawl(f, 0);
    }
    
    // private version: has the parameter(s) that the coder needs in order to
    // implement the desired recursive behavior
    private static void crawl(File f, int indent) {
        for (int i = 0; i < indent; i++) {
            System.out.print(" ");
        }
        System.out.println(f.getName());

        if (f.isDirectory()) {
            // recursive case (a directory)
            // print this directory's name, indented
            for (int i = 0; i < indent; i++) {
                System.out.print(" ");
            }
            System.out.println(f.getName());
            
            // print all the files in this directory, recursively
            File[] files = f.listFiles();
            for (int i = 0; i < files.length; i++) {
                crawl(files[i], indent + 4);
            }
        }
    }
}