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76 lines
2.4 KiB
Python
76 lines
2.4 KiB
Python
# Copyright 2013 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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"""An option parser which handles the first arg as a command.
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Add other nice functionality such as printing a list of commands
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and an example in usage.
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"""
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import optparse
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import sys
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class CommandOptionParser(optparse.OptionParser):
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"""Wrapper class for OptionParser to help with listing commands."""
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def __init__(self, *args, **kwargs):
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"""Creates a CommandOptionParser.
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Args:
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commands_dict: A dictionary mapping command strings to an object defining
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- add_options_func: Adds options to the option parser
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- run_command_func: Runs the command itself.
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example: An example command.
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everything else: Passed to optparse.OptionParser contructor.
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"""
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self.commands_dict = kwargs.pop('commands_dict', {})
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self.example = kwargs.pop('example', '')
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if not 'usage' in kwargs:
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kwargs['usage'] = 'Usage: %prog <command> [options]'
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optparse.OptionParser.__init__(self, *args, **kwargs)
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#override
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def get_usage(self):
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normal_usage = optparse.OptionParser.get_usage(self)
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command_list = self.get_command_list()
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example = self.get_example()
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return self.expand_prog_name(normal_usage + example + command_list)
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#override
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def get_command_list(self):
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if self.commands_dict.keys():
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return '\nCommands:\n %s\n' % '\n '.join(
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sorted(self.commands_dict.keys()))
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return ''
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def get_example(self):
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if self.example:
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return '\nExample:\n %s\n' % self.example
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return ''
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def ParseAndExecute(option_parser, argv=None):
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"""Parses options/args from argv and runs the specified command.
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Args:
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option_parser: A CommandOptionParser object.
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argv: Command line arguments. If None, automatically draw from sys.argv.
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Returns:
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An exit code.
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"""
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if not argv:
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argv = sys.argv
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if len(argv) < 2 or argv[1] not in option_parser.commands_dict:
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# Parse args first, if this is '--help', optparse will print help and exit
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option_parser.parse_args(argv)
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option_parser.error('Invalid command.')
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cmd = option_parser.commands_dict[argv[1]]
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cmd.add_options_func(option_parser)
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options, args = option_parser.parse_args(argv)
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return cmd.run_command_func(argv[1], options, args, option_parser)
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