ch05.002_best

Perl Best Practices the source code

##############################################################################
##   Code fragment (Recommended) from Chapter 5 of "Perl Best Practices"    ##
##     Copyright (c) O'Reilly & Associates, 2005. All Rights Reserved.      ##
##  See: http://www.oreilly.com/pub/a/oreilly/ask_tim/2001/codepolicy.html  ##
##############################################################################


# Standard modules...
use strict;
use warnings;
use IO::Prompt;
use Carp;
use English qw( -no_match_vars );
use Data::Alias;
use Readonly;


package Customer;
 
use Perl6::Export::Attrs;
 
# State variables...
my %customer = (
    12345 => { name => 'Jan'    },
    23456 => { name => 'Sascha' },
    34567 => { name => 'Drew'   },
);
my %opt;
 
sub set_terse {
    $opt{terse} = 1;
    return;
}
 
sub list_customers : Export {
    for my $id (sort keys %customer) {
        if ($opt{terse}) {
            print "$customer{$id}{name}\n";
        }
        else {
            print $customer{$id}->dump();
        }
    }
    return;
}
 
# and elsewhere...
 
package main;
# use Customer qw( list_customers );
 
Customer::set_terse();
 
Customer::list_customers();