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62 lines
2.1 KiB
62 lines
2.1 KiB
# Copyright 2015 Google Inc. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import argparse
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class _Bailout(Exception):
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pass
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class ArgumentParser(argparse.ArgumentParser):
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SUPPRESS = argparse.SUPPRESS
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def __init__(self, host, prog, desc, **kwargs):
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kwargs['prog'] = prog
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kwargs['description'] = desc
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kwargs['formatter_class'] = argparse.RawDescriptionHelpFormatter
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super(ArgumentParser, self).__init__(**kwargs)
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self._host = host
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self.exit_status = None
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self.add_argument('-V', '--version', action='store_true',
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help='print the version and exit')
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def parse_args(self, args=None, namespace=None):
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try:
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rargs = super(ArgumentParser, self).parse_args(args=args,
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namespace=namespace)
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except _Bailout:
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return None
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return rargs
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# Redefining built-in 'file' pylint: disable=W0622
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def _print_message(self, msg, file=None):
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self._host.print_(msg=msg, stream=file, end='\n')
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def print_help(self, file=None):
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self._print_message(msg=self.format_help(), file=file)
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def error(self, message, bailout=True): # pylint: disable=W0221
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self.exit(2, '%s: error: %s\n' % (self.prog, message), bailout=bailout)
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def exit(self, status=0, message=None, # pylint: disable=W0221
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bailout=True):
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self.exit_status = status
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if message:
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self._print_message(message, file=self._host.stderr)
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if bailout:
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raise _Bailout()
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