def parse_args(parser, argv=None):
"""Parse aguments."""
# Parse general arguments, extract the command, add command-specific
# arguments, and then re-parse everything again.
# The argparse module provides subparser support, and we could have
# used that. However, there a serious usability issue with that, because
# "command <subcmd> --foo" is an error if --foo is a valid argument
# for command but not for the sub-command. Given that is very common
# to mistakenly pass options out of order, we imlement our own solution
# here that accepts the options in this case.
try:
args = parser.parse_args(argv)
except argparse.ParseError as e:
args = e.namespace
if not (args.help or args.version) and not args.subcmd:
console.write_err(parser.format_usage())
console.error(str(e))
error.exit(error.EX_USAGE)
if args.help and not args.subcmd:
console.write_err(parser.format_help())
error.exit(error.EX_OK)
if args.version and not args.subcmd:
console.writeln_err(_version.version_string)
error.exit(error.EX_OK)
subcmd = args.subcmd
if subcmd not in subcommands:
console.error("Unknown command: '{0}'.", subcmd)
error.exit(error.EX_USAGE)
add_args = subcommands[subcmd][1]
add_args(parser)
try:
args = parser.parse_args(argv)
except argparse.ParseError as e:
args = e.namespace
if not args.help:
console.write_err(parser.format_usage())
console.error(str(e))
error.exit(error.EX_USAGE)
if args.help:
console.write_err(parser.format_help())
error.exit(error.EX_OK)
return args
def main(argv=None):
"""The "ravtest" main entry point."""
if sys.platform.startswith('win'):
console.error('Windows is not currently supported by "ravtest".\n'
'Please use the Fabric front-end.')
error.exit(1)
parser = create_parser()
args = parse_args(parser, argv)
create_environment(args)
setup_logging()
command = subcommands[args.subcmd][0]
try:
ret = command(args, env)
except KeyboardInterrupt:
console.complete_partial_line()
console.writeln('Exiting at user request.')
ret = error.EX_INTERRUPTED
except SystemExit as e:
console.complete_partial_line()
if env.debug:
console.error('SystemExit caught')
lines = traceback.format_exception(*sys.exc_info())
console.writeln_err('Raised from:')
console.writeln_err(''.join(lines))
ret = e[0]
except Exception as e:
console.complete_partial_line()
console.error(str(e))
if env.debug:
lines = ['An uncaught exception occurred:']
lines += traceback.format_exception(*sys.exc_info())
console.writeln_err()
console.writeln_err(''.join(lines))
console.writeln_err('Environment: {!r}'.format(env))
ret = getattr(e, 'exitstatus', error.EX_SOFTWARE)
return ret
