def configobj_walker(cfg):
    """
    walks over a ConfigObj (INI file with comments) generating
    corresponding YAML output (including comments
    """
    from configobj import ConfigObj
    assert isinstance(cfg, ConfigObj)
    for c in cfg.initial_comment:
        if c.strip():
            yield c
    for s in _walk_section(cfg):
        if s.strip():
            yield s
    for c in cfg.final_comment:
        if c.strip():
            yield c


def _walk_section(s, level=0):
    from configobj import Section
    assert isinstance(s, Section)
    indent = u'  ' * level
    for name in s.scalars:
        for c in s.comments[name]:
            yield indent + c.strip()
        x = s[name]
        if u'\n' in x:
            i = indent + u'  '
            x = u'|\n' + i + x.strip().replace(u'\n', u'\n' + i)
        elif ':' in x:
            x = u"'" + x.replace(u"'", u"''") + u"'"
        line = u'{0}{1}: {2}'.format(indent, name, x)
        c = s.inline_comments[name]
        if c:
            line += u' ' + c
        yield line
    for name in s.sections:
        for c in s.comments[name]:
            yield indent + c.strip()
        line = u'{0}{1}:'.format(indent, name)
        c = s.inline_comments[name]
        if c:
            line += u' ' + c
        yield line
        for val in _walk_section(s[name], level=level+1):
            yield val

##def config_obj_2_rt_yaml(cfg):
##    from .comments import CommentedMap, CommentedSeq
##    from configobj import ConfigObj
##    assert isinstance(cfg, ConfigObj)
##    #for c in cfg.initial_comment:
##    #    if c.strip():
##    #        pass
##    cm = CommentedMap()
##    for name in s.sections:
##        cm[name] = d = CommentedMap()
##
##
##    #for c in cfg.final_comment:
##    #    if c.strip():
##    #        yield c
##    return cm