old_contents: import bleach
  
  from html5lib.sanitizer import HTMLSanitizer
  
  from markdown.postprocessors import Postprocessor
  from markdown import Extension
  
  
  class MyTokenizer(HTMLSanitizer):
      def sanitize_token(self, token):
          return token
  
  
  class LinkifyPostprocessor(Postprocessor):
      def __init__(self, md, linkify_callbacks=[]):
          super(Postprocessor, self).__init__(md)
          self._callbacks = linkify_callbacks
  
      def run(self, text):
          text = bleach.linkify(text,
                                callbacks=self._callbacks,
                                tokenizer=MyTokenizer)
          return text
  
  
  class LinkifyExtension(Extension):
      config = {'linkify_callbacks': [[], 'Callbacks to send to bleach.linkify']}
  
      def extendMarkdown(self, md, md_globals):
          md.postprocessors.add(
              "linkify",
              LinkifyPostprocessor(md, self.getConfig('linkify_callbacks')),
              "_begin")
  
  
  def makeExtension(*args, **kwargs):
      return LinkifyExtension(*args, **kwargs)
  
new_contents: import bleach
  
  from markdown.postprocessors import Postprocessor
  from markdown import Extension
  
  
  class LinkifyPostprocessor(Postprocessor):
      def __init__(self, md, linkify_callbacks=[]):
          super(Postprocessor, self).__init__(md)
          self._callbacks = linkify_callbacks
  
      def run(self, text):
          text = bleach.linkify(text,
                                callbacks=self._callbacks)
          return text
  
  
  class LinkifyExtension(Extension):
      config = {'linkify_callbacks': [[], 'Callbacks to send to bleach.linkify']}
  
      def extendMarkdown(self, md, md_globals):
          md.postprocessors.add(
              "linkify",
              LinkifyPostprocessor(md, self.getConfig('linkify_callbacks')),
              "_begin")
  
  
  def makeExtension(*args, **kwargs):
      return LinkifyExtension(*args, **kwargs)
  
subject: Make compatible with Bleach v2.0 and html5lib v1.0