NAME

Perl::PrereqInstaller - Install missing modules explicitly loaded in Perl files

VERSION

Version 0.6.2

SYNOPSIS

Scan, Install, and report results via command line:

    install-perl-prereqs lib/ bin/

Scan files and Install modules via script:

    use Perl::PrereqInstaller;
    my $installer = Perl::PrereqInstaller->new;
    $installer->scan( @files, @directories );
    $installer->cpanm;

    $installer->quiet(1);

Access and report scan/install status via script:

    my @not_installed  = $installer->not_installed;
    my @prev_installed = $installer->previously_installed;

    my @newly_installed = $installer->newly_installed;
    my @failed_install  = $installer->failed_install;

    my @scan_errors   = $installer->scan_errors;
    my %scan_warnings = $installer->scan_warnings;

    $installer->report;

DESCRIPTION

Extract the names of the modules explicitly loaded in Perl files, check which modules are not installed, and install the missing modules. Since this module relies on Perl::PrereqScanner to statically identify dependencies, it has the same caveats regarding identifying loaded modules. Therefore, modules that are loaded dynamically (e.g., eval "require $class") will not be identified as dependencies or installed.

Command-line tool

Command-line usage is possible with install-perl-prereqs (co-installed with this module).

    install-perl-prereqs FILE_OR_DIR [FILE_OR_DIR ...]
        -h, --help
        -d, --dry-run
        -q, --quiet
        -v, --version

Methods for scanning files and installing modules

new

Initializes a new Perl::PrereqInstaller object.

scan( FILES and/or DIRECTORIES )

Analyzes all specified FILES (regardless of file type) and Perl files (.pl/.pm/.cgi/.psgi/.t) within specified DIRECTORIES to generate a list of modules explicitly loaded and identify which are not currently installed. Subsequent use of scan() will update the lists of not yet installed and previously installed modules.

cpanm

Use cpanm to install loaded modules that are not currently installed.

quiet( BOOLEAN )

Set quiet mode to on/off (default: off). Quiet mode turns off most of the output. If BOOLEAN is not provided, this method returns quiet mode's current state.

Methods for accessing and reporting scan/install status

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.

previously_installed

Returns an alphabetical list of unique installed modules that were explicitly loaded.

newly_installed

Returns an alphabetical list of unique modules that were explicitly loaded, needed to be installed, and were successfully installed.

failed_install

Returns an alphabetical list of unique modules that were explicitly loaded and needed to be installed, but whose installation failed.

scan_errors

Returns a list of files that produced a parsing error when being scanned. These files are skipped.

scan_warnings

Returns a hash of arrays containing the names of files (the keys) that raised warnings (the array contents) during parsing. These warnings are likely indicative of issues with the code in the parsed files rather than actual parsing problems.

report

Write (to STDOUT) a summary of scan/install results. By default, all status methods below (except scan_warnings) are summarized. To customize the contents of report(), pass it an anonymous hash:

    $installer->report(
        {   'not_installed'        => 0,
            'previously_installed' => 0,
            'newly_installed'      => 1,
            'failed_install'       => 1,
            'scan_errors'          => 0,
            'scan_warnings'        => 0,
        }
    );

SEE ALSO

Perl::PrereqScanner, App::cpanoutdated, lib::xi, Module::Extract::Use

The command-line tool scan-perl-prereqs gets installed together with Perl::PrereqScanner. The basic functionality of install-perl-prereqs can be recreated with scan-perl-prereqs | cpanm; however, install-perl-prereqs comes with a few bonuses. These include:

Better error handling

In the event of parse errors, scan-perl-prereqs dies even if there are files remaining to be scanned, whereas install-perl-prereqs logs the error and scans the next file.

Summary report

install-perl-prereqs provides a summary of scan and install results.

No unexpected updates

While scan-perl-prereqs | cpanm attempts to update all previously-installed modules found in a scan, install-perl-prereqs only attempts to install modules if they are not yet installed.

Perhaps a better way to update installed CPAN modules is to use cpan-outdated (from App::cpanoutdated):

    cpan-outdated -p | cpanm

SOURCE AVAILABILITY

The source code is on Github: https://github.com/mfcovington/Perl-PrereqInstaller

AUTHOR

Michael F. Covington, <mfcovington@gmail.com>

BUGS

Please report any bugs or feature requests at https://github.com/mfcovington/Perl-PrereqInstaller/issues.

INSTALLATION

To install this module from GitHub using cpanm:

    cpanm git@github.com:mfcovington/Perl-PrereqInstaller.git

Alternatively, download and run the following commands:

    perl Build.PL
    ./Build
    ./Build test
    ./Build install

SUPPORT AND DOCUMENTATION

You can find documentation for this module with the perldoc command.

    perldoc Perl::PrereqInstaller

LICENSE AND COPYRIGHT

Copyright 2014 Michael F. Covington.

This program is free software; you can redistribute it and/or modify it under the terms of the the Artistic License (2.0). You may obtain a copy of the full license at:

http://www.perlfoundation.org/artistic_license_2_0

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 that your Modified Version complies with the requirements of this license.

This license does not grant you the right to use any trademark, service 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 and otherwise transfer the Package with respect to any patent claims licensable by the Copyright Holder that are necessarily infringed by the Package. If you institute patent litigation (including a cross-claim or 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 HOLDER 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.

cpanm Perl::PrereqInstaller

perl -MCPAN -e shell
install Perl::PrereqInstaller