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# 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)