ch14.020_best_ex14.4

Perl Best Practices the source code

##############################################################################
##   Example 14.4 (Recommended) from Chapter 14 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 14-4. Command-line parsing via Getopt::Clade


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


# Handle command-lines of the form:
#
#    > orchestrate -in source.txt -o=dest.orc -verbose

# Specify and parse valid command-line arguments...
use Getopt::Clade q{
    -i[n]  [=] <file:in>    Specify input file  [default: '-']
    -o[ut] [=] <file:out>   Specify output file [default: '-']

    -l[en] [=] <l:+int>     Display length [default: 24 ]
    -w[id] [=] <w:+int>     Display width  [default: 78 ]

    -v                      Print all warnings
    --verbose               [ditto]
};

# Report intended behaviour...
if ($ARGV{-v}) {
    print "Loading first $ARGV{'-l'} chunks of file: $ARGV{'-i'}\n"
}
# etc.