#!/usr/bin/env python

# THIS FILE IS PART OF THE CYLC SUITE ENGINE.
# Copyright (C) 2008-2016 NIWA
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

"""cylc [util] random A B

Generate a random integer in the range [A,B). This is just a command
interface to Python's random.randrange() function.

Arguments:
   A     start of the range interval (inclusive)
   B     end of the random range (exclusive, so must be > A)"""

import os
import sys
import random
from optparse import OptionParser

import cylc.flags


def main():
    parser = OptionParser(__doc__)
    (options, args) = parser.parse_args()

    if len(args) != 2:
        parser.error("Two integer arguments required")

    start = int(args[0])
    end = int(args[1])
    print random.randrange(start, end)


if __name__ == "__main__":
    try:
        main()
    except Exception as exc:
        if cylc.flags.debug:
            raise
        sys.exit(str(exc))
