import logging
import sys
import optparse

def makeLogger(options):
    logger = logging.getLogger("main")
    logger.setLevel(logging.INFO)
    stdout = logging.StreamHandler(sys.stdout)
    logger.addHandler(stdout)
    if options.verbose:
        logger.verbose = True
    else:
        if not options.debug: stdout.setLevel(logging.ERROR)
    if options.debug: logger.setLevel(logging.DEBUG)
    return logger

class UserException(Exception):
    """User friendly exceptions inherit from here"""
    pass

class NullLogHandler(logging.Handler):
    """Log handler that doesn't do anything"""
    def emit(self, record):
        pass

class WizardOptionParser(optparse.OptionParser):
    """Configures some default user-level options"""
    def __init__(self, *args, **kwargs):
        optparse.OptionParser.__init__(self, *args, **kwargs)
        self.add_option("-v", "--verbose", dest="verbose", action="store_true",
                default=False, help="Turns on verbose output")
        self.add_option("--debug", dest="debug", action="store_true",
                default=False, help="Turns on debugging output")
    def parse_all(self, argv, logger):
        options, numeric_args = self.parse_args(argv)
        return options, numeric_args, logger and logger or makeLogger(options)