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