#   Copyright 2013 OpenStack Foundation
#
#   Licensed under the Apache License, Version 2.0 (the "License"); you may
#   not use this file except in compliance with the License. You may obtain
#   a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
#   Unless required by applicable law or agreed to in writing, software
#   distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#   WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#   License for the specific language governing permissions and limitations
#   under the License.
#

"""argparse Custom Actions"""

import argparse


class KeyValueAction(argparse.Action):
    """A custom action to parse arguments as key=value pairs.
    Ensures that dest is a dict
    """
    def __call__(self, parser, namespace, values, option_string=None):
        # Make sure we have an empty dict rather than None
        if getattr(namespace, self.dest, None) is None:
            setattr(namespace, self.dest, {})

        # Add value if an assignment else remove it
        if '=' in values:
            getattr(namespace, self.dest, {}).update([values.split('=', 1)])
        else:
            getattr(namespace, self.dest, {}).pop(values, None)