#!/usr/bin/env python
     #
     # Copyright 2007 Doug Hellmann.
     #
     #
     #                         All Rights Reserved
     #
     # Permission to use, copy, modify, and distribute this software and
     # its documentation for any purpose and without fee is hereby
     # granted, provided that the above copyright notice appear in all
     # copies and that both that copyright notice and this permission
     # notice appear in supporting documentation, and that the name of Doug
     # Hellmann not be used in advertising or publicity pertaining to
     # distribution of the software without specific, written prior
     # permission.
     #
     # DOUG HELLMANN DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
     # INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
     # NO EVENT SHALL DOUG HELLMANN BE LIABLE FOR ANY SPECIAL, INDIRECT OR
     # CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
     # OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
     # NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
     # CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     #
     
     """Using callbacks for options.
     
     """
     
     __module_id__ = "$Id$"
     #end_pymotw_header
     
     import optparse
     
     def flag_callback(option, opt_str, value, parser):
         print 'flag_callback:'
         print '\toption:', repr(option)
         print '\topt_str:', opt_str
         print '\tvalue:', value
         print '\tparser:', parser
         return
     
     def with_callback(option, opt_str, value, parser):
         print 'with_callback:'
         print '\toption:', repr(option)
         print '\topt_str:', opt_str
         print '\tvalue:', value
         print '\tparser:', parser
         return
     
     parser = optparse.OptionParser()
     parser.add_option('--flag', action="callback", callback=flag_callback)
     parser.add_option('--with', 
                       action="callback",
                       callback=with_callback,
                       type="string",
                       help="Include optional feature")
     
     parser.parse_args(['--with', 'foo', '--flag'])