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 visitdir(self, path):
        """Similar to matcher.visitdir"""
        path = normalizerootdir(path, "visitdir")
        if self.matchrecursive:
            return "all"
        elif self.unsurerecursive:
            return True
        elif path == "":
            return True

        if self._kindpats and self._compiledpats(path):
            # XXX: This is incorrect. But re patterns are already used in
            # production. We should kill them!
            # Need to test "if every string starting with 'path' matches".
            # Obviously it's impossible to test *every* string with the
            # standard regex API, therefore pick a random strange path to test
            # it approximately.
            if self._compiledpats("%s/*/_/-/0/*" % path):
                return "all"
            else:
                return True

        if self._globdirpats and self._compileddirpats(path):
            return True

        subdir, rest = self._split(path)
        subtree = self.get(subdir)
        if subtree is None:
            return False
        else:
            return subtree.visitdir(rest)