Grab sources downloads links

def source(self):
        """Grab sources downloads links
        """
        source, source64, = "", ""
        for line in self.SLACKBUILDS_TXT.splitlines():
            if line.startswith(self.line_name):
                sbo_name = line[17:].strip()
            if line.startswith(self.line_down):
                if sbo_name == self.name and line[21:].strip():
                    source = line[21:]
            if line.startswith(self.line_down_64):
                if sbo_name == self.name and line[28:].strip():
                    source64 = line[28:]
        return self._select_source_arch(source, source64)