#!/usr/bin/env perl
# +-======-+ 
#  Copyright (c) 2003-2018 United States Government as represented by 
#  the Admistrator of the National Aeronautics and Space Administration.  
#  All Rights Reserved.
#  
#  THIS OPEN  SOURCE  AGREEMENT  ("AGREEMENT") DEFINES  THE  RIGHTS  OF USE,
#  REPRODUCTION,  DISTRIBUTION,  MODIFICATION AND REDISTRIBUTION OF CERTAIN 
#  COMPUTER SOFTWARE ORIGINALLY RELEASED BY THE UNITED STATES GOVERNMENT AS 
#  REPRESENTED BY THE GOVERNMENT AGENCY LISTED BELOW ("GOVERNMENT AGENCY").  
#  THE UNITED STATES GOVERNMENT, AS REPRESENTED BY GOVERNMENT AGENCY, IS AN 
#  INTENDED  THIRD-PARTY  BENEFICIARY  OF  ALL  SUBSEQUENT DISTRIBUTIONS OR 
#  REDISTRIBUTIONS  OF THE  SUBJECT  SOFTWARE.  ANYONE WHO USES, REPRODUCES, 
#  DISTRIBUTES, MODIFIES  OR REDISTRIBUTES THE SUBJECT SOFTWARE, AS DEFINED 
#  HEREIN, OR ANY PART THEREOF,  IS,  BY THAT ACTION, ACCEPTING IN FULL THE 
#  RESPONSIBILITIES AND OBLIGATIONS CONTAINED IN THIS AGREEMENT.
#  
#  Government Agency: National Aeronautics and Space Administration
#  Government Agency Original Software Designation: GSC-15354-1
#  Government Agency Original Software Title:  GEOS-5 GCM Modeling Software
#  User Registration Requested.  Please Visit http://opensource.gsfc.nasa.gov
#  Government Agency Point of Contact for Original Software:  
#  			Dale Hithon, SRA Assistant, (301) 286-2691
#  
# +-======-+ 
#=======================================================================
# name - num_days_in_month
# purpose - wrapper script for num_days_in_month() in Manipulate_time.pm
#=======================================================================
use strict;
use warnings;

# global variables
#-----------------
my ($year, $month);

# main program
#-------------
{
    use FindBin;
    use lib "$FindBin::Bin";
    use Manipulate_time ("num_days_in_month");
    my $num_days;

    init();
    $num_days = num_days_in_month($year, $month);
    print "$num_days\n";
}

#=======================================================================
# name - init
# purpose - get runtime parameters
#=======================================================================
sub init {
    use Getopt::Long;
    my ($help);

    GetOptions( "h|help" => \$help );
    usage() if $help;

    # get inputs
    #-----------
    ($year, $month) = @ARGV;
    unless ($year and $month) { warn "Warning. Incorrect inputs;"; usage() }
}

#=======================================================================
# name - usage
# purpose - print usage information
#=======================================================================
sub usage {
    use File::Basename ("basename");
    my $name = basename $0;
    print <<"EOF";

usage: $name year month
purpose: prints number of days in the specified year/month

EOF
exit;
}