module.pm

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package CPANPLUS::Module;

use strict;
use vars qw[@ISA];


use CPANPLUS::Dist;
use CPANPLUS::Error;
use CPANPLUS::Module::Signature;
use CPANPLUS::Module::Checksums;
use CPANPLUS::Internals::Constants;

use FileHandle;

use Locale::Maketext::Simple    Class => 'CPANPLUS', Style => 'gettext';
use IPC::Cmd                    qw[can_run run];
use File::Find                  qw[find];
use Params::Check               qw[check];
use Module::Load::Conditional   qw[can_load check_install];

$Params::Check::VERBOSE = 1;

@ISA = qw[ CPANPLUS::Module::Signature CPANPLUS::Module::Checksums];

=pod

=head1 NAME

CPANPLUS::Module

=head1 SYNOPSIS

    ### get a module object from the CPANPLUS::Backend object
    my $mod = $cb->module_tree('Some::Module');

    ### accessors
    $mod->version;
    $mod->package;

    ### methods
    $mod->fetch;
    $mod->extract;
    $mod->install;


=head1 DESCRIPTION

C<CPANPLUS::Module> creates objects from the information in the
source files. These can then be used to query and perform actions
on, like fetching or installing.

These objects should only be created internally. For C<fake> objects,
there's the C<CPANPLUS::Module::Fake> class. To obtain a module object
consult the C<CPANPLUS::Backend> documentation.

=cut

my $tmpl = {
    module      => { default => '', required => 1 },    # full module name
    version     => { default => '0.0' },                # version number
    path        => { default => '', required => 1 },    # extended path on the
                                                        # cpan mirror, like
                                                        # /author/id/K/KA/KANE
    comment     => { default => ''},                    # comment on module
    package     => { default => '', required => 1 },    # package name, like
                                                        # 'bar-baz-1.03.tgz'
    description => { default => '' },                   # description of the
                                                        # module
    dslip       => { default => EMPTY_DSLIP },          # dslip information
    _id         => { required => 1 },                   # id of the Internals
                                                        # parent object
    _status     => { no_override => 1 },                # stores status object
    author      => { default => '', required => 1,
                     allow => IS_AUTHOBJ },             # module author
    mtime       => { default => '' },
};

### some of these will be resolved by wrapper functions that
### do Clever Things to find the actual value, so don't create
### an autogenerated sub for that just here, take an alternate
### name to allow for a wrapper
{   my %rename = (
        dslip   => '_dslip'
    );

    ### autogenerate accessors ###
    for my $key ( keys %$tmpl ) {
        no strict 'refs';
      
        my $sub = $rename{$key} || $key;
      
        *{__PACKAGE__."::$sub"} = sub {
            $_[0]->{$key} = $_[1] if @_ > 1;
            return $_[0]->{$key};
        }
    }
}


=pod

=head1 CLASS METHODS

=head2 accessors ()

Returns a list of all accessor methods to the object

=cut

### *name is an alias, include it explicitly
sub accessors { return ('name', keys %$tmpl) };

=head1 ACCESSORS

An objects of this class has the following accessors:

=over 4

=item name

Name of the module.

=item module

Name of the module.

=item version

Version of the module. Defaults to '0.0' if none was provided.

=item path

Extended path on the mirror.

=item comment

Any comment about the module -- largely unused.

=item package

The name of the package.

=item description

Description of the module -- only registered modules have this.

=item dslip

The five character dslip string, that represents meta-data of the
module -- again, only registered modules have this.

=cut

sub dslip {
    my $self    = shift;   

    ### if this module has relevant dslip info, return it
    return $self->_dslip if $self->_dslip ne EMPTY_DSLIP;

    ### if not, look at other modules in the same package,
    ### see if *they* have any dslip info
    for my $mod ( $self->contains ) {
        return $mod->_dslip if $mod->_dslip ne EMPTY_DSLIP;
    }
    
    ### ok, really no dslip info found, return the default
    return EMPTY_DSLIP;
}


=pod

=item status

The C<CPANPLUS::Module::Status> object associated with this object.
(see below).

=item author

The C<CPANPLUS::Module::Author> object associated with this object.

=item parent

The C<CPANPLUS::Internals> object that spawned this module object.

=back

=cut

### Alias ->name to ->module, for human beings.
*name = *module;

sub parent {
    my $self = shift;
    my $obj  = CPANPLUS::Internals->_retrieve_id( $self->_id );

    return $obj;
}

=head1 STATUS ACCESSORS

C<CPANPLUS> caches a lot of results from method calls and saves data
it collected along the road for later reuse.

C<CPANPLUS> uses this internally, but it is also available for the end
user. You can get a status object by calling:

    $modobj->status

You can then query the object as follows:

=over 4

=item installer_type

The installer type used for this distribution. Will be one of
'makemaker' or 'build'. This determines whether C<CPANPLUS::Dist::MM>
or C<CPANPLUS::Dist::Build> will be used to build this distribution.

=item dist_cpan

The dist object used to do the CPAN-side of the installation. Either
a C<CPANPLUS::Dist::MM> or C<CPANPLUS::Dist::Build> object.

=item dist

The custom dist object used to do the operating specific side of the
installation, if you've chosen to use this. For example, if you've
chosen to install using the C<ports> format, this may be a
C<CPANPLUS::Dist::Ports> object.

Undefined if you didn't specify a separate format to install through.

=item prereqs

A hashref of prereqs this distribution was found to have. Will look
something like this:

    { Carp  => 0.01, strict => 0 }

Might be undefined if the distribution didn't have any prerequisites.

=item signature

Flag indicating, if a signature check was done, whether it was OK or
not.

=item extract

The directory this distribution was extracted to.

=item fetch

The location this distribution was fetched to.

=item readme

The text of this distributions README file.

=item uninstall

Flag indicating if an uninstall call was done successfully.

=item created

Flag indicating if the C<create> call to your dist object was done
successfully.

=item installed

Flag indicating if the C<install> call to your dist object was done
successfully.

=item checksums

The location of this distributions CHECKSUMS file.

=item checksum_ok

Flag indicating if the checksums check was done successfully.

=item checksum_value

The checksum value this distribution is expected to have

=back

=head1 METHODS

=head2 $self = CPANPLUS::Module::new( OPTIONS )

This method returns a C<CPANPLUS::Module> object. Normal users
should never call this method directly, but instead use the
C<CPANPLUS::Backend> to obtain module objects.

This example illustrates a C<new()> call with all required arguments:

        CPANPLUS::Module->new(
            module  => 'Foo',
            path    => 'authors/id/A/AA/AAA',
            package => 'Foo-1.0.tgz',
            author  => $author_object,
            _id     => INTERNALS_OBJECT_ID,
        );

Every accessor is also a valid option to pass to C<new>.

Returns a module object on success and false on failure.

=cut


sub new {
    my($class, %hash) = @_;

    ### don't check the template for sanity
    ### -- we know it's good and saves a lot of performance
    local $Params::Check::SANITY_CHECK_TEMPLATE = 0;

    my $object  = check( $tmpl, \%hash ) or return;

    bless $object, $class;

    return $object;
}

### only create status objects when they're actually asked for
sub status {
    my $self = shift;
    return $self->_status if $self->_status;
    
    my $acc = Object::Accessor->new;
    $acc->mk_accessors( qw[ installer_type dist_cpan dist prereqs
                            signature extract fetch readme uninstall
                            created installed prepared checksums files
                            checksum_ok checksum_value _fetch_from] );

    $self->_status( $acc );

    return $self->_status;
}


### flush the cache of this object ###
sub _flush {
    my $self = shift;
    $self->status->mk_flush;
    return 1;
}

=head2 $mod->package_name

Returns the name of the package a module is in. For C<Acme::Bleach>
that might be C<Acme-Bleach>.

=head2 $mod->package_version

Returns the version of the package a module is in. For a module
in the package C<Acme-Bleach-1.1.tar.gz> this would be C<1.1>.

=head2 $mod->package_extension

Returns the suffix added by the compression method of a package a
certain module is in. For a module in C<Acme-Bleach-1.1.tar.gz>, this
would be C<tar.gz>.

=head2 $mod->package_is_perl_core

Returns a boolean indicating of the package a particular module is in,
is actually a core perl distribution.

=head2 $mod->module_is_supplied_with_perl_core( [version => $]] )

Returns a boolean indicating whether C<ANY VERSION> of this module
was supplied with the current running perl's core package.

=head2 $mod->is_bundle

Returns a boolean indicating if the module you are looking at, is
actually a bundle. Bundles are identified as modules whose name starts
with C<Bundle::>.

=head2 $mod->is_third_party

Returns a boolean indicating whether the package is a known third-party 
module (i.e. it's not provided by the standard Perl distribution and 
is not available on the CPAN, but on a third party software provider).
See L<Module::ThirdParty> for more details.

=head2 $mod->third_party_information

Returns a reference to a hash with more information about a third-party
module. See the documentation about C<module_information()> in 
L<Module::ThirdParty> for more details.

=cut

{   ### fetches the test reports for a certain module ###
    my %map = (
        name        => 0,
        version     => 1,
        extension   => 2,
    );