ch19.005_best

Perl Best Practices the source code

##############################################################################
##   Code fragment (Recommended) from Chapter 19 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  ##
##############################################################################

#  Example 19-5. The configuration file, reloaded

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


use Config::Std;
use Data::Dumper 'Dumper';

my $data = do { local $/; <DATA> };
 
# Read in the config file...
read_config \$data => my %config;
 
warn Dumper [ \%config ];

# Update the library path and disclaimer...
$config{Internals}{lib} = ['~/.plugins', '/lib/share/plugins'];
$config{Interface}{Disclaimer} = 'Whatever, dude!';
 
# Delete the verbose option...
delete $config{verbose};
 
# Add a "Limits" section...
$config{Limits}{max_time}  = 1000;
$config{Limits}{max_space} = 1e6;
 
my $updated;
# Write back config file...
write_config %config => \$updated;

print $updated;


__DATA__

# Example 19-3. A simple configuration language

[Interface]
# Configurable bits that others will see...
 
Author: Jan-Yu Eyrie
E-mail: eju@calnet
 
Disclaimer: This code is provided AS IS, and comes with 
          : ABSOLUTELY NO WARRANTY OF ANY KIND WHATSOEVER!
          : It's buggy, slow, and will almost certainly
          : break your computer. Use at your own risk!
 
[Internals]
# Stuff no-one else sees...
 
# Look-up path for plug-ins...
lib: ~/lib/perl5
lib: ~/lib/perl
lib: /usr/share/lib/perl
 
[strict]    # Don't allow malformed inputs
[verbose]   # Report every step
[log]       # And log every transaction