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All the Perl that's Practical to Extract and Report

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  • I use the following test in all of my modules. It checks that all modules and scripts have the same version number. In conjunction with a Perl::Critic test that ensures every file has a $VERSION, it's nearly foolproof.

    #!perl -w
    use warnings;
    use strict;
    use File::Find;
    use File::Slurp;
    use Test::More qw(no_plan);

    my $last_version = undef;

    sub check {
          return if (! m{blib/script/}xms && ! m{\.pm \z}xms);

          my $content = read_file($_);

          # only look at perl scripts, not sh scripts
          return if (m{blib/script/}xms && $content !~ m/\A \#![^\r\n]+?perl/xms);

          my @version_lines = $content =~ m/ ( [^\n]* \$VERSION [^\n]* ) /gxms;
          if (@version_lines == 0) {
          for my $line (@version_lines) {
                if (!defined $last_version) {
                      $last_version = shift @version_lines;
                } else {
                      is($line, $last_version, $_);

    find({wanted => \&check, no_chdir => 1}, 'blib');

    if (! defined $last_version) {
          fail('Failed to find any files with $VERSION');