ch09.014_prob

Perl Best Practices the source code

##############################################################################
## Code fragment (NOT RECOMMENDED) from Chapter 9 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;


Readonly my $SPACE => q{ };
 

# Pad a string with whitespace...
sub padded {
    # Compute the left and right indents required...

    my $gap   = $_[1] - length $_[0];
    my $left  = $_[2] ? int($gap/2) : 0;
    my $right = $gap - $left;

 
    # Insert that many spaces fore and aft...

    return $SPACE x $left 
         . $_[0] 
         . $SPACE x $right;
}


print '[', padded( 'hi there', 40, 1 ), "]\n";
print '[', padded( 'hi there', 40, 0 ), "]\n";