old_contents: ################################################################################
  '''
  Copyright (c) 2013, janague <janague@gmail.com>
  All rights reserved.
  
  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met: 
  
  1. Redistributions of source code must retain the above copyright notice, this
     list of conditions and the following disclaimer. 
  2. Redistributions in binary form must reproduce the above copyright notice,
     this list of conditions and the following disclaimer in the documentation
     and/or other materials provided with the distribution. 
  
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  '''
  ################################################################################
  
  import urllib2
  import settings as st
  from bs4 import BeautifulSoup as Soup
  
  def retrieve_url (url):
      """ This function retrieve all urls tagged by 'a' in the html source code.
      """
      opener = urllib2.build_opener()
      try:
  	t = opener.open (url).read ()
  	parser = Soup(t)
  	return [x['href'] for x in parser.findAll ('a') if x.has_attr ('href')]
      except urllib2.URLError:
          # URL is not properly formed
  	return []
      except ValueError:
          # URL has a error value
          return []
  
  def print_links (url, depth, bullet=st.WS_BULLET):
      """ print links in recursive mode """
      if depth == 0:
          # Depth is overtaken then return to up level
          return
  
      links = retrieve_url (url)
      for l in links:
          d = depth - 1
          if l:
              print '%s %s' %(bullet,l)
          print_links (l,d,bullet+st.WS_BULLET)
  
new_contents: ################################################################################
  '''
  Copyright (c) 2013, janague <janague@gmail.com>
  All rights reserved.
  
  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met: 
  
  1. Redistributions of source code must retain the above copyright notice, this
     list of conditions and the following disclaimer. 
  2. Redistributions in binary form must reproduce the above copyright notice,
     this list of conditions and the following disclaimer in the documentation
     and/or other materials provided with the distribution. 
  
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  '''
  ################################################################################
  
  import urllib2
  import settings as st
  from bs4 import BeautifulSoup as Soup
  
  def retrieve_url (url):
      """ This function retrieve all urls tagged by 'a' in the html source code.
      """
      opener = urllib2.build_opener()
      try:
  	t = opener.open (url).read ()
  	parser = Soup(t)
  	return [x['href'] for x in parser.findAll ('a') if x.has_attr ('href')]
      except urllib2.URLError:
          # URL is not properly formed
  	return []
      except ValueError:
          # URL has a error value
          # TODO dont print the url.
          return []
  
  def print_links (url, depth, bullet=st.WS_BULLET):
      """ print links in recursive mode """
      if depth == 0:
          # Depth is overtaken then return to up level
          return
  
      links = retrieve_url (url)
      for l in links:
          d = depth - 1
          if l:
              print '%s %s' %(bullet,l)
          print_links (l,d,bullet+st.WS_BULLET)
  
subject: Test crash no url valid