The other day I got a new laptop and tried to run a couple scripts on it. I quickly grew tired of the tedious cycle of 'Module::X not found' errors/installing Module::X. I decided to make a tool to improve the situation.

The result, Module::Extract::Install, can be used to analyze perl scripts and modules to identify and install their dependencies in an automated, pain-free manner. You can use this module's methods to write your own script (e.g., to pipe missing modules to your favorite installer) or take advantage of the included command-line tools cpanm-missing (checks a list of Perl files) and cpanm-missing-deep (checks all the Perl files within a directory).

Feel free to give me last minute comments/suggestions before I put it on CPAN (currently it is only available through GitHub). Thanks!

package Module::Extract::Install; use strict; use warnings; use Carp; use File::Find; use Module::Extract::Use; =head1 NAME Module::Extract::Install - Install missing modules explicitly loaded by a Perl script or module =head1 VERSION Version 0.4.4 =cut our $VERSION = '0.4.4'; =head1 SYNOPSIS Via command line: cpanm-missing cpanm-missing-deep path/to/directory Via a script: use Module::Extract::Install; my $installer = Module::Extract::Install->new; $installer->check_modules(@files); $installer->check_modules_deep($directory); my @uninstalled = $installer->not_installed; my @installed = $installer->previously_installed; $installer->cpanm; my @newly_installed = $installer->newly_installed; my @failed_install = $installer->failed_install; =head1 DESCRIPTION Extract the names of the modules explicitly loaded in a Perl script or module and install them if they are not already installed. Since this module relies on L<Module::Extract::Use|Module::Extract::Use>, it has the same caveats regarding identifying loaded modules. Therefore, modules that are loaded dynamically (e.g., C<eval "require $class">) will not be installed. Command-line usage is possible with C<cpanm-missing> and C<cpanm-missing-deep>, scripts that are installed along with this module. =cut =over 4 =item new Initializes a new Module::Extract::Install object. =cut sub new { my $class = shift; my $self = { _not_installed => {}, _previously_installed => {}, _newly_installed => {}, _failed_install => {}, }; bless $self, $class; return $self; } =item check_modules( FILES ) Analyzes FILES to generate a list of modules explicitly loaded in FILES and identifies which are not currently installed. Subsequent calls of this method will continue adding to the lists of modules that are not installed (or already installed). =cut sub check_modules { my ( $self, @file_list ) = @_; my $extractor = Module::Extract::Use->new; # Some pragmas and/or modules misbehave or are irrelevant my %banned = ( 'autodie' => 1, 'base' => 1, 'feature' => 1, 'overload' => 1, 'strict' => 1, 'vars' => 1, 'warnings' => 1, ); # Ignore things such as 'Prototype mismatch' and deprecation warni +ngs my $NOWARN = 0; $SIG{'__WARN__'} = sub { warn $_[0] unless $NOWARN }; for my $file (@file_list) { my @module_list = $extractor->get_modules($file); next if -s $file >= 1048576; # Temporary method for error handling: if ( $extractor->error ) { carp "Problem extracting modules used in $file"; } for my $module (@module_list) { next if exists $banned{$module}; $NOWARN = 1; eval "use $module;"; $NOWARN = 0; if ($@) { $self->{_not_installed}{$module}++; } else { $self->{_previously_installed}{$module}++; } } } } =item check_modules_deep( DIRECTORY, PATTERN ) Traverses a DIRECTORY and runs C<check_modules()> on files that match PATTERN, a case-insensitive regular expression. If omitted, PATTERN defaults to C<^.+\.p[lm]$> and matches files ending in C<.pl> or C<.pm>. Subsequent calls of this method will continue adding to the lists of modules that are not installed (or already installed). =cut sub check_modules_deep { my ( $self, $directory, $pattern ) = @_; $pattern = defined $pattern ? qr/$pattern/i : qr/^.+\.p[lm]$/i; print "\n"; print "Files found:\n"; find( sub { return unless /$pattern/; print " $File::Find::dir/$_\n"; $self->check_modules($_); }, $directory ); print "\n"; } =item cpanm Use cpanm to install loaded modules that are not currently installed. =cut sub cpanm { my $self = shift; my @modules = sort keys %{ $self->{_not_installed} }; for (@modules) { my $exit_status = system("cpanm $_"); if ($exit_status) { $self->{_failed_install}{$_}++; } else { delete $self->{_not_installed}{$_}; delete $self->{_failed_install}{$_}; $self->{_newly_installed}{$_}++; } } } =item not_installed Returns an alphabetical list of unique modules that were explicitly loaded, but need to be installed. Modules are removed from this list upon installation. =cut sub not_installed { my $self = shift; return sort keys %{ $self->{_not_installed} }; } =item previously_installed Returns an alphabetical list of unique installed modules that were explicitly loaded. =cut sub previously_installed { my $self = shift; return sort keys %{ $self->{_previously_installed} }; } =item newly_installed Returns an alphabetical list of unique modules that were explicitly loaded, needed to be installed, and were successfully installed. =cut sub newly_installed { my $self = shift; return sort keys %{ $self->{_newly_installed} }; } =item failed_install Returns an alphabetical list of unique modules that were explicitly loaded and needed to be installed, but whose installation failed. =cut sub failed_install { my $self = shift; return sort keys %{ $self->{_failed_install} }; } =back =head1 SEE ALSO L<Module::Extract::Use|Module::Extract::Use> =head1 SOURCE AVAILABILITY The source code is on Github: L<> =head1 AUTHOR Michael F. Covington, <> =head1 BUGS Please report any bugs or feature requests at L<>. =head1 INSTALLATION To install this module, run the following commands: perl Build.PL ./Build ./Build test ./Build install =head1 SUPPORT AND DOCUMENTATION You can find documentation for this module with the perldoc command. perldoc Module::Extract::Install =head1 LICENSE AND COPYRIGHT Copyright 2014 Michael F. Covington. This program is free software; you can redistribute it and/or modify i +t under the terms of the the Artistic License (2.0). You may obtain a copy of the full license at: L<> Any use, modification, and distribution of the Standard or Modified Versions is governed by this Artistic License. By using, modifying or distributing the Package, you accept this license. Do not use, modify, or distribute the Package, if you do not accept this license. If your Modified Version has been derived from a Modified Version made by someone other than you, you are nevertheless required to ensure tha +t your Modified Version complies with the requirements of this license. This license does not grant you the right to use any trademark, servic +e mark, tradename, or logo of the Copyright Holder. This license includes the non-exclusive, worldwide, free-of-charge patent license to make, have made, use, offer to sell, sell, import an +d otherwise transfer the Package with respect to any patent claims licensable by the Copyright Holder that are necessarily infringed by t +he Package. If you institute patent litigation (including a cross-claim o +r counterclaim) against any party alleging that the Package constitutes direct or contributory patent infringement, then this Artistic License to you shall terminate on the date that such litigation is filed. Disclaimer of Warranty: THE PACKAGE IS PROVIDED BY THE COPYRIGHT HOLDE +R AND CONTRIBUTORS "AS IS' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES +. THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT ARE DISCLAIMED TO THE EXTENT PERMITTED BY YOUR LOCAL LAW. UNLESS REQUIRED BY LAW, NO COPYRIGHT HOLDER OR CONTRIBUTOR WILL BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING IN ANY WAY OUT OF THE USE OF THE PACKAGE +, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. =cut 1;
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Re: Install missing modules with Module::Extract::Install's cpanm-missing/cpanm-missing-deep
by glenn (Scribe) on Aug 18, 2014 at 14:59 UTC

    Since my scripts get put on a lot of systems and people have varying degrees of ability and explaining takes time I include this in the head of each of my scripts.