#!/usr/bin/perl
use strict;
use warnings;
use open ':utf8';

use Getopt::Long;

my $conf  = {}; # configuration hashref
initialize($conf);

open FP, '<', shift or die "Can't open input file: $!\n";

while (<FP>) {

}

sub initialize {
    my ($c) = @_;
    my @missing = ();

    # set mode on existing filehandles
    binmode(STDIN, ':utf8');

    my $rc = GetOptions( $c,
                         'prefix|p=s',
                         'help|h',
                       );
    show_help() unless $rc;
    show_help() if ($c->{help});

    my @keys = keys %{$c};
    show_help() unless (@ARGV and @keys);
    for my $key ('prefix')
      { push @missing, $key unless $c->{$key} }
    if (@missing) {
        print "Required option: ", join(', ', @missing), " missing!\n";
        show_help();
    }
}

sub show_help {
    print <<HELP;
Usage is: compress_fingerprints -p PREFIX INPUTFILE
HELP
exit;
}