NAME Distribution::Metadata - gather distribution metadata in local SYNOPSIS use Distribution::Metadata; my $info = Distribution::Metadata->new_from_module("LWP::UserAgent"); print $info->name; # libwww-perl print $info->version; # 6.13 print $info->distvname; # libwww-perl-6.13 print $info->author; # ETHER print $info->pathname; # E/ET/ETHER/libwww-perl-6.13.tar.gz print $info->main_module; # LWP print $info->main_module_version; # 6.13 print $info->main_module_file; # path of LWP.pm print $info->packlist; # path of .packlist print $info->meta_directory; # path of .meta directory print $info->install_json; # path of install.json print $info->mymeta_json; # path of MYMETA.json my $files = $info->files; # files which are listed in .packlist my $install_json_hash = $info->install_json_hash; my $mymeta_json_hash = $info->mymeta_json_hash; DESCRIPTION (CAUTION: This module is still in development phase. API will change without notice.) Sometimes we want to know: Where this module comes from? Which distribution does this module belong to? Since cpanm 1.5000 (released 2011.10.13), it installs not only modules but also their meta data. So we can answer that questions! Distribution::Metadata gathers distribution metadata in local. That is, this module tries to gather * main module name, version, file * .packlist file * .meta directory * install.json file * MYMETA.json file Please note that as mentioned above, this module deeply depends on cpanm behavior. If you install cpan modules by hands or some cpan clients other than cpanm, this module won't work. HOW IT WORKS Let me explain how $class->new_from_module($module, inc => $inc) works. * Get $module_file by Module::Metadata->new_from_module($module, inc => $inc)->filename. * Find $packlist in which $module_file is listed. * From $packlist pathname (eg: ...auto/LWP/.packlist), determine $main_module and main module search directory $lib. * Get $main_module_version by Module::Metadata->new_from_module($main_module, inc => [$lib, "$lib/$Config{archname}"])->version * Find install.json that has "name" eq $main_module, and provides $main_module with version $main_module_version. * Get .meta directory and MYMETA.json with install.json. CONSTRUCTORS my $info = $class->new_from_module($module, inc => \@dirs, fill_archlib => $bool) Create Distribution::Metadata instance from module name. You can append inc argument to specify module/packlist/meta search paths. Default is \@INC. Also you can append fill_archlib argument so that archlibs are automatically added to inc if missing. Please note that, even if the module cannot be found, new_from_module returns a Distribution::Metadata instance. However almost all methods returns false for such objects. If you want to know whether the distribution was found or not, try: my $info = $class->new_from_module($module); if ($info->packlist) { # found } else { # not found } my $info = $class->new_from_file($file, inc => \@dirs, fill_archlib => $bool) Create Distribution::Metadata instance from file path. You can append inc and fill_archlib arguments too. Also new_from_file retunes a Distribution::Metadata instance, even if file cannot be found. METHODS Please note that the following methods return false when appropriate modules or files cannot be found. my $name = $info->name (alias: $info->dist) distribution name (eg: libwww-perl) my $version = $info->version distribution version (eg: 6.13) my $distvname = $info->distvname distribution vname (eg: libwww-perl-6.13) my $author = $info->author (alias: $info->cpanid) distribution author (eg: ETHER) my $pathname = $info->pathname distribution pathname (eg: E/ET/ETHER/libwww-perl-6.13.tar.gz) my $file = $info->packlist .packlist file path my $dir = $info->meta_directory .meta directory path my $file = $info->install_json install.json file path my $file = $info->mymeta_json MYMETA.json file path my $main_module = $info->main_module main module name my $version = $info->main_module_version main module version my $file = $info->main_module_file main module file path my $files = $info->files file paths which is listed in .packlist file my $hash = $info->install_json_hash a hash reference for install.json my $info = Distribution::Metadata->new_from_module("LWP::UserAgent"); my $install = $info->install_json_hash; $install->{version}; # 6.13 $install->{dist}; # libwww-perl-6.13 $install->{provides}; # a hash reference of providing modules ... my $hash = $info->mymeta_json_hash a hash reference for MYMETA.json my $info = Distribution::Metadata->new_from_module("LWP::UserAgent"); my $meta = $info->mymeta_hash; $meta->{version}; # 6.13 $meta->{abstract}; # The World-Wide Web library for Perl $meta->{prereqs}; # prereq hash ... SEE ALSO Module::Metadata App::cpanminus LICENSE Copyright (C) 2015 Shoichi Kaji This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. AUTHOR Shoichi Kaji