def argparser(argv):

    usage = (

      "kallithea-config [-h] [--filename=FILENAME] [--template=TEMPLATE] \n"

      "VARS optional specify extra template variable that will be available in "

      "template. Use comma separated key=val format eg.\n"

      "key1=val1,port=5000,host=127.0.0.1,elements='a\,b\,c'\n"

    )

    parser = argparse.ArgumentParser(

        description='Kallithea CONFIG generator with variable replacement',

        usage=usage

    )

    ## config

    group = parser.add_argument_group('CONFIG')

    group.add_argument('--filename', help='Output ini filename.')

    group.add_argument('--template', help='Mako template file to use instead of '

                                          'the default builtin template')

    group.add_argument('--raw', help='Store given mako template as raw without '

                                     'parsing. Use this to create custom template '

                                     'initially', action='store_true')

    group.add_argument('--show-defaults', help='Show all default variables for '

                                               'builtin template', action='store_true')

    args, other = parser.parse_known_args()

    return parser, args, other

def _escape_split(text, sep):

    """

    Allows for escaping of the separator: e.g. arg='foo\, bar'

    It should be noted that the way bash et. al. do command line parsing, those

    single quotes are required. a shameless ripoff from fabric project.

    """

    escaped_sep = r'\%s' % sep

    if escaped_sep not in text:

        return text.split(sep)

    before, _, after = text.partition(escaped_sep)

    startlist = before.split(sep)  # a regular split is fine here

    unfinished = startlist[-1]

    startlist = startlist[:-1]

    # recurse because there may be more escaped separators

    endlist = _escape_split(after, sep)

    # part of the string sent in recursion is the rest of the escaped value.

    unfinished += sep + endlist[0]

    return startlist + [unfinished] + endlist[1:]  # put together all the parts

def _run(argv):

    parser, args, other = argparser(argv)

    if not len(sys.argv) > 1:

        print parser.print_help()

        sys.exit(0)

    # defaults that can be overwritten by arguments

    tmpl_stored_args = {

        'http_server': 'waitress',

        'lang': 'en',

        'database_engine': 'sqlite',

        'host': '127.0.0.1',

        'port': 5000,

        'error_aggregation_service': None,

    }

    if other:

        # parse arguments, we assume only first is correct

        kwargs = {}

        for el in _escape_split(other[0], ','):

            kv = _escape_split(el, '=')

            if len(kv) == 2:

                k, v = kv

                kwargs[k] = v

        # update our template stored args

        tmpl_stored_args.update(kwargs)

    # use default that cannot be replaced

    tmpl_stored_args.update({

        'uuid': lambda: uuid.uuid4().hex,

        'here': os.path.abspath(os.curdir),

    })

    if args.show_defaults:

        for k,v in tmpl_stored_args.iteritems():

            print '%s=%s' % (k, v)

        sys.exit(0)

    try:

        # built in template

        tmpl_file = os.path.join(here, TMPL)

        if args.template:

            tmpl_file = args.template

        with open(tmpl_file, 'rb') as f:

            tmpl_data = f.read().decode('utf-8')

            if args.raw: