List of packages by repository

def pkg_list(self):
        """List of packages by repository
        """
        options = [
            "-l",
            "--list"
        ]
        flag = ["--index", "--installed", "--name"]
        name = INDEX = installed = False
        for arg in self.args[2:]:
            if flag[0] == arg:
                INDEX = True
            if flag[1] in arg:
                installed = True
            if flag[2] == arg:
                name = True
            if arg not in flag:
                usage("")
                raise SystemExit()
        if (len(self.args) > 1 and len(self.args) <= 5 and
                self.args[0] in options):
            if self.args[1] in self.meta.repositories:
                PackageManager(binary=None).package_list(self.args[1],
                                                         name,
                                                         INDEX,
                                                         installed)
            else:
                usage(self.args[1])
        else:
            usage("")