# coding: utf-8

# cmdline.py - functions for handling command-line options

#

# Copyright (C) 2013-2017 Arthur de Jong

#

# This library is free software; you can redistribute it and/or

# modify it under the terms of the GNU Lesser General Public

# License as published by the Free Software Foundation; either

# version 2.1 of the License, or (at your option) any later version.

#

# This library is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# Lesser General Public License for more details.

#

# You should have received a copy of the GNU Lesser General Public

# License along with this library; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301 USA

import argparse

import constants

version_string = '''

%s

Written by Arthur de Jong.

Copyright (C) 2013-2017 Arthur de Jong

This is free software; see the source for copying conditions.  There is NO

warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

'''.strip() % constants.PACKAGE_STRING

class VersionAction(argparse.Action):

    def __init__(self, option_strings, dest,

                 help='output version information and exit'):

        super(VersionAction, self).__init__(

            option_strings=option_strings,

            dest=argparse.SUPPRESS,

            default=argparse.SUPPRESS,

            nargs=0,

            help=help)

    def __call__(self, parser, namespace, values, option_string=None):

        print(version_string)

        parser.exit()

class ListShellsAction(argparse.Action):

    def __init__(self, option_strings, dest,

                 help='list the shells found in /etc/shells'):

        super(ListShellsAction, self).__init__(

            option_strings=option_strings,

            dest=argparse.SUPPRESS,

            default=argparse.SUPPRESS,

            nargs=0,

            help=help)

    def __call__(self, parser, namespace, values, option_string=None):

        import shells

        for shell in shells.list_shells():

            print(shell)

        parser.exit()