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# Copyright 2015 Google Inc. All rights reserved.
#
# 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.
import argparse
class _Bailout(Exception):
pass
class ArgumentParser(argparse.ArgumentParser):
SUPPRESS = argparse.SUPPRESS
def __init__(self, host, prog, desc, **kwargs):
kwargs['prog'] = prog
kwargs['description'] = desc
kwargs['formatter_class'] = argparse.RawDescriptionHelpFormatter
super().__init__(**kwargs)
self._host = host
self.exit_status = None
self.add_argument(
'-V',
'--version',
action='store_true',
help='print the version and exit',
)
def parse_args(self, args=None, namespace=None):
try:
rargs = super().parse_args(args=args, namespace=namespace)
except _Bailout:
return None
return rargs
def _print_message(self, message, file=None):
self._host.print_(msg=message, stream=file, end='\n')
def print_help(self, file=None):
self._print_message(message=self.format_help(), file=file)
def error(self, message, bailout=True):
self.exit(2, f'{self.prog}: error: {message}\n', bailout=bailout)
def exit(self, status=0, message=None, bailout=True):
self.exit_status = status
if message:
self._print_message(message, file=self._host.stderr)
if bailout:
raise _Bailout()
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