/ 
Module-Data-0.007
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 / Module::Data
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1 PAUSE user

Kent Fredric πŸ”₯🐢🍡πŸ”₯

NAME

Module::Data - Introspect context information about modules in @INC

VERSION

version 0.007

SYNOPSIS

        use Module::Data;

        my $d = Module::Data->new( 'Package::Stash' );

        $d->path; # returns the path to where Package::Stash was found in @INC

        $d->root; # returns the root directory in @INC that 'Package::Stash' was found inside.

        # Convenient trick to discern if you're in a development environment

        my $d = Module::Data->new( 'Module::Im::Developing' );

        if ( -e $d->root->parent->subdir('share') ) {
                # Yep, this dir exists, so we're in a dev context.
                # because we know in the development context all modules are in lib/*/*
                # so if the modules are anywhere else, its not a dev context.
                # see File::ShareDir::ProjectDistDir for more.
        }

        # Helpful sugar.

        my $v = $d->version;

METHODS

package

Returns the package the Module::Data instance was created for. ( In essence, this will just return the value you passed during new, nothing more, nothing less.

        my $package = $md->package

loaded

Check to see if the module is already recorded as being loaded in %INC

        if ( $md->loaded ) {
                say "$md was loaded";
        }

require

Require the module be loaded into memory and the global stash.

  my $mod = Module::Data->new( 'Foo' ); # nothing much happens.
  $mod->require; # like 'require Foo';

Returns the "package" name itself for convenience so you can do

  my $mod = Module::Data->new('Foo');
  $mod->require->new( %args );

path

A Path::Class::File with the absolute path to the found module.

        my $md = Module::Data->new( 'Foo' );
        my $path = $md->path;

$path is computed optimistically. If the "package" is listed as being "loaded", then it asks %INC for where it was found, otherwise, the path is resolved by simulating perl's path look up in @INC via Path::ScanINC.

root

Returns the base directory of the tree the module was found at. ( Probably from @INC );

        local @INC = (
                "somewhere/asinine/",
                "somewhere/in/space/",   # Where Lib::Foo::Bar is
                "somethingelse/",
        );
        my $md = Module::Data->new( "Lib::Foo::Bar");
        $md->path ; # somewhere/in/space/Lib/Foo/Bar.pm
        my $root = $md->root # somewhere/in/space

version

If the module appears to be already loaded in memory:

        my $v = $md->version;

is merely shorthand for $package->VERSION;

However, if if the module is not loaded into memory, all efforts to extract the value without loading the code permanently are performed.

Here, this means we compute the path to the file manually ( see "path" ) and parse the file with Module::Metadata to statically extract $VERSION.

This means you can unleash this code on your entire installed module tree, while incurring no permanent memory gain as you would normally incur if you were to require them all.

AUTHOR

Kent Fredric <kentnl@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2013 by Kent Fredric <kentnl@cpan.org>.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.