code: def tidy_html(html_buffer, cleaning_lib='utidylib'):
      
  
      if CFG_TIDY_INSTALLED and cleaning_lib == 'utidylib':
          options = dict(output_xhtml=1,
                         show_body_only=1,
                         merge_divs=0,
                         wrap=0)
          try:
              output = str(tidy.parseString(html_buffer, **options))
          except:
              output = html_buffer
      elif CFG_BEAUTIFULSOUP_INSTALLED and cleaning_lib == 'beautifulsoup':
          try:
              output = str(BeautifulSoup(html_buffer).prettify())
          except:
              output = html_buffer
      else:
          output = html_buffer
  
      return output
docs: Tidy up the input HTML using one of the installed cleaning
      libraries.
  
      @param html_buffer: the input HTML to clean up
      @type html_buffer: string
      @param cleaning_lib: chose the preferred library to clean the HTML. One of:
                           - utidylib
                           - beautifulsoup
      @return: a cleaned version of the input HTML
      @note: requires uTidylib or BeautifulSoup to be installed. If the chosen library is missing, the input X{html_buffer} is returned I{as is}.