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51 lines
1.8 KiB
Python
51 lines
1.8 KiB
Python
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# Copyright 2015 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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import argparse
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class CustomHelpAction(argparse.Action):
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'''Allows defining custom help actions.
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Help actions can run even when the parser would otherwise fail on missing
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arguments. The first help or custom help command mentioned on the command
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line will have its help text displayed.
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Usage:
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parser = argparse.ArgumentParser(...)
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CustomHelpAction.EnableFor(parser)
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parser.add_argument('--foo-help',
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action='custom_help',
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custom_help_text='this is the help message',
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help='What this helps with')
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'''
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# Derived from argparse._HelpAction from
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# https://github.com/python/cpython/blob/master/Lib/argparse.py
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# pylint: disable=redefined-builtin
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# (complains about 'help' being redefined)
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def __init__(self,
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option_strings,
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dest=argparse.SUPPRESS,
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default=argparse.SUPPRESS,
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custom_help_text=None,
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help=None):
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super(CustomHelpAction, self).__init__(option_strings=option_strings,
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dest=dest,
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default=default,
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nargs=0,
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help=help)
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if not custom_help_text:
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raise ValueError('custom_help_text is required')
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self._help_text = custom_help_text
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def __call__(self, parser, namespace, values, option_string=None):
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print self._help_text
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parser.exit()
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@staticmethod
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def EnableFor(parser):
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parser.register('action', 'custom_help', CustomHelpAction)
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