// Hunter Schafer, CSE 143
// This program prints out the structure of a given directory or file
import java.io.File;
import java.util.Scanner;

public class DirectoryCrawler {

    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 out the name of the given file.
    // If the given file is a directory, prints the information about its children
    // The output is indented like any file browser.
    // pre: file.exists()
    public static void print(File file) {
        print(file, 0);
    }
    
    // Prints out the name of the given file with indent levels of indentation (4 spaces each)
    // If the given file is a directory, prints the information about its children.
    // pre: f.exists()
    private static void print(File file, int indent) {
        for (int i = 0; i < indent; i++) {
            System.out.print("    ");
        }
        System.out.println(file.getName());

        if (file.isDirectory()) { // directory 
            File[] subFiles = file.listFiles();
            
            // You could use a for-each loop here since we don't really care about i!
            for (int i = 0; i < subFiles.length; i++) {  
                print(subFiles[i], indent + 1);
            }
            
        }    
    }
}