run-standalone-madcow

#!/usr/bin/env python

"""run madcow as a standalone bot"""

import importlib
import argparse
import sys
import os

BASEDIR = os.path.dirname(os.path.abspath(__file__))

class MadcowVersion(argparse._VersionAction):

    """argparse action to fetch the current madcow version"""

    def __call__(self, parser, namespace, values, option_string=None):
        try:
            madcow = self.import_madcow(basedir=namespace.basedir)
        except (SystemExit, KeyboardInterrupt):
            raise
        except:
            ret, version = 1, 'UNKNOWN'
        else:
            ret, version = 0, madcow.__version__
        parser.exit(ret, version + os.linesep)

    @classmethod
    def import_madcow(cls, basedir=None):
        """attempt to import madcow from the given lib base"""
        if basedir is None:
            basedir = BASEDIR
        sys.path.insert(0, basedir)
        sys.dont_write_bytecode = True
        return importlib.import_module('madcow')


def main(args=None):
    """command-line interface"""
    parser = argparse.ArgumentParser(description=__doc__, add_help=False)
    _ = parser.add_argument_group('options').add_argument
    _('-b', dest='basedir', metavar='<dir>', default=BASEDIR,
            help='base runtime dir [%(default)s]')
    _('-d', dest='datadir', metavar='<dir>', default='data',
            help='bot data dir (relative to base or absolute) [%(default)s]')
    _('-n', dest='noeditor', default=False, action='store_true',
            help="suppress launching $EDITOR settings.py on first run")
    _('-h', action='help',
            help='show this help message and exit')
    _('-v', action=MadcowVersion,
            help="show program's version number and exit")
    opts = parser.parse_args(args)
    madcow = MadcowVersion.import_madcow(basedir=opts.basedir)
    madcow.run(base=opts.datadir, noeditor=opts.noeditor)
    return 0

if __name__ == '__main__':
    sys.exit(main())