def freeze(h, output_yaml, resolve, groups):
    """Output installed packages."""
    if not groups:
        groups = filter(lambda group: not group.lower().startswith("bower"),
                        h.requirements.keys())
    else:
        groups = [text_type.strip(group) for group in groups.split(",")]

    if output_yaml:
        for requirements in h.requirements.values():
            for requirement in requirements:
                if resolve and not requirement.version:
                    requirement.load_installed_version()
        click.echo(h.requirements.yaml)
    else:
        for group in groups:
            if not h.requirements[group]:
                continue
            click.echo("# {}".format(group))
            for requirement in h.requirements[group]:
                if resolve and not requirement.version:
                    requirement.load_installed_version()
                click.echo(str(requirement))
def request_message_txt(self):
        """
        This is the body of the request we send across. This is never actually
        used in the code, but exists for debugging purposes -- you can call
        `print attempt.request_message_txt()` on the console and get a readable
        rendering of the request that would be sent across, without actually
        sending anything.
        """
        headers, body = self.create_request()

        header_txt = "\n".join(
            u"{}: {}".format(h, v) for h, v in sorted(headers.items())
        )
        body_txt = json.dumps(body, indent=2, sort_keys=True, ensure_ascii=False).encode('utf-8')

        return header_txt + "\n\n" + body_txt