perl-modules-installed.pl

#!/usr/bin/env perl

use Modern::Perl '2009';    # Enable Perl 5.10 features
use strict;                 # Included so that perlcritic does not complain
use warnings;               #                 ditto
use 5.010;                  # Only works under Perl 5.10 and later
use autodie qw( :all );     # Make system functions either succeed or die
use strictures 2;           # Turn on strict and make most warnings fatal

use English;

# Determine the list of module names

my @module_names;
foreach my $inc_dir (@INC) {
    my @file_names;
    eval {
        @file_names = `find $inc_dir -name '*.pm' 2>/dev/null`;
    };
    continue if ($EVAL_ERROR);
    foreach my $found (@file_names) {
        chomp $found;                   # remove the trailing newline

        $found =~ s{                    # substitute...
                    \A $inc_dir         # ...a beginning dir name
                   }
                   {}xms;               # replacing it with nothing

        $found =~ s{                    # substitute...
                    \.pm \z               # ... an ending .pm
                   }
                   {}xms;               # replacing it with nothing

        $found =~ s{                    # substitute...
                    /                   # ... each slash (/)
                   }
                   {::}gxms;            # replacing it with ::

        $found =~ s{                    # substitute...
                    \A ::               # ... a beginning ::
                   }
                   {}xms;               # replacing it with nothing

        push @module_names, $found;     # and add to the module names list
    }
}

# Finally, print a lexicographically sorted list of the module names

for my $module_name ( sort @module_names ) {
    say $module_name;
}

# vim: set filetype=perl smartindent autoindent smarttab expandtab tabstop=4 softtabstop=4 shiftwidth=4 autoread