// This version of the crawler that also

// "harvests" email addresses from webpages

import io.Source

import scala.util.matching.Regex

import scala.util._

def get_page(url: String) : String = {

  Try(Source.fromURL(url).take(10000).mkString) getOrElse 

    { println(s"  Problem with: $url"); ""}

}

// regexes for URLs, for "my" domain and for email addresses

val my_urls = """urbanc""".r

val email_pattern = """([a-z0-9_\.-]+)@([\da-z\.-]+)\.([a-z\.]{2,6})""".r

def unquote(s: String) = s.drop(1).dropRight(1)

def get_all_URLs(page: String) : Set[String] = {

  http_pattern.findAllIn(page).map(unquote).toSet

}

def crawl(url: String, n: Int) : Unit = {

  if (n == 0) ()

  else {

    println(s"Visiting: $n $url")

    val page = get_page(url)

  }

}

// staring URL for the crawler

crawl(startURL, 3)