*generate the epub book from a URL*

def _url_to_epub(
            self):
        """*generate the epub book from a URL*
        """
        self.log.debug('starting the ``_url_to_epub`` method')

        from polyglot import htmlCleaner
        cleaner = htmlCleaner(
            log=self.log,
            settings=self.settings,
            url=self.urlOrPath,
            outputDirectory=self.outputDirectory,
            title=self.title,  # SET TO FALSE TO USE WEBPAGE TITLE,
            style=False,  # add simpdf's styling to the HTML document
            metadata=True,  # include metadata in generated HTML (e.g. title),
            h1=False  # include title as H1 at the top of the doc
        )
        html = cleaner.clean()

        if not html:
            return None

        if self.footer:
            footer = self._tmp_html_file(self.footer)
            footer = '"%(footer)s"' % locals()
        else:
            footer = ""

        if self.header:
            header = self._tmp_html_file(self.header)
            header = '"%(header)s"' % locals()
        else:
            header = ""

        # HTML SOURCE FILE
        epub = html.replace(".html", ".epub")
        pandoc = self.settings["executables"]["pandoc"]

        cmd = """%(pandoc)s -S -s -f html -t epub3 %(header)s '%(html)s' %(footer)s -o '%(epub)s' """ % locals(
        )
        p = Popen(cmd, stdout=PIPE, stderr=PIPE, shell=True)
        stdout, stderr = p.communicate()
        self.log.debug('output: %(stdout)s' % locals())

        try:
            with open(epub):
                pass
            fileExists = True
        except IOError:
            fileExists = False
            raise IOError(
                "the epub %s does not exist on this machine, here is the failure message: %s" % (epub, stderr))

        os.remove(html)

        self.log.debug('completed the ``_url_to_epub`` method')
        return epub