from abc import ABCMeta, abstractmethod
import argparse
import os
import sys
import inspect
import re

import Object

class Cmd(Object.Object): # export

    __metaclass__=ABCMeta

    @abstractmethod
    def run(self, args):
        pass

    def __init__(self, name, help):
	self.name = name
        self.help = help

    def _run(self, args):
        pass

    def add_parser(self, parsers):
	r = parsers.add_parser(self.name, help=self.help,
            formatter_class=argparse.ArgumentDefaultsHelpFormatter)
	r.set_defaults(func=self.run)
        return r

def run_sub_commands(description = '', prefix = 'Cmd'): # export

    classes = inspect.getmembers(sys.modules["__main__"], inspect.isclass)
    parser = argparse.ArgumentParser(usage=os.path.basename(sys.argv[0]) + ' [command] [options]',
	formatter_class=argparse.ArgumentDefaultsHelpFormatter, description=description)
    parser.add_argument('--log-level', help='Log level', default='notice')
    subparsers = parser.add_subparsers(title='Available commands', metavar='')

    for (name, cls) in classes:
	if not re.match('^Cmd.', name):
	    continue
	if inspect.isabstract(cls):
	    continue
	cls().add_parser(subparsers)

    args=parser.parse_args()
    jwutils.log.set_level(args.log_level)
    args.func(args)