docs: def produce_pdf(rst_content=None, doctree_content=None, filename=None):
      """produce a pdf content based of a given rst content
  
      If filename is given, it will store the result using the given filename
      if no filename is given, it will generate a pdf in /tmp/ with a random
      name
      """
      if filename is None:
          filename = os.path.join(
              "/tmp", ''.join([random.choice(string.ascii_letters +
              string.digits) for n in range(15)]) + '.pdf')
      r2p = RstToPdf(stylesheets=['pdf.style'],
                     style_path=[os.path.join(os.path.dirname(__file__),
                                              'styles')],
                     breaklevel=0,
                     splittables=True,
                     footer="""###Title### - ###Page###/###Total###""")
      r2p.createPdf(text=rst_content,
                    doctree=doctree_content,
                    output=filename)
      return filename