NAME

       ExtUtils::Installed - Inventory management of installed modules

SYNOPSIS

          use ExtUtils::Installed;
          my ($inst) = ExtUtils::Installed->new( skip_cwd => 1 );
          my (@modules) = $inst->modules();
          my (@missing) = $inst->validate("DBI");
          my $all_files = $inst->files("DBI");
          my $files_below_usr_local = $inst->files("DBI", "all", "/usr/local");
          my $all_dirs = $inst->directories("DBI");
          my $dirs_below_usr_local = $inst->directory_tree("DBI", "prog");
          my $packlist = $inst->packlist("DBI");

DESCRIPTION

       ExtUtils::Installed  provides a standard way to find out what core and module files have
       been installed.  It uses the information stored in .packlist files created during
       installation to provide this information.  In addition it provides facilities to classify
       the installed files and to extract directory information from the .packlist files.

USAGE

       The new() function searches for all the installed .packlists on the system, and stores
       their contents. The .packlists can be queried with the functions described below. Where it
       searches by default is determined by the settings found in %Config::Config, and what the
       value is of the PERL5LIB environment variable.

METHODS

       Unless specified otherwise all method can be called as class methods, or as object
       methods. If called as class methods then the "default" object will be used, and if
       necessary created using the current processes %Config and @INC.  See the 'default' option
       to new() for details.

       new()
           This takes optional named parameters. Without parameters, this searches for all the
           installed .packlists on the system using information from %Config::Config and the
           default module search paths @INC. The packlists are read using the ExtUtils::Packlist
           module.

           If the named parameter "skip_cwd" is true, the current directory "." will be stripped
           from @INC before searching for .packlists.  This keeps ExtUtils::Installed from
           finding modules installed in other perls that happen to be located below the current
           directory.

           If the named parameter "config_override" is specified, it should be a reference to a
           hash which contains all information usually found in %Config::Config. For example, you
           can obtain the configuration information for a separate perl installation and pass
           that in.

               my $yoda_cfg  = get_fake_config('yoda');
               my $yoda_inst =
                          ExtUtils::Installed->new(config_override=>$yoda_cfg);

           Similarly, the parameter "inc_override" may be a reference to an array which is used
           in place of the default module search paths from @INC.

               use Config;
               my @dirs = split(/\Q$Config{path_sep}\E/, $ENV{PERL5LIB});
               my $p5libs = ExtUtils::Installed->new(inc_override=>\@dirs);

           Note: You probably do not want to use these options alone, almost always you will want
           to set both together.

           The parameter "extra_libs" can be used to specify additional paths to search for
           installed modules. For instance

               my $installed =
                        ExtUtils::Installed->new(extra_libs=>["/my/lib/path"]);

           This should only be necessary if /my/lib/path is not in PERL5LIB.

           Finally there is the 'default', and the related 'default_get' and 'default_set'
           options. These options control the "default" object which is provided by the class
           interface to the methods. Setting "default_get" to true tells the constructor to
           return the default object if it is defined. Setting "default_set" to true tells the
           constructor to make the default object the constructed object. Setting the "default"
           option is like setting both to true. This is used primarily internally and probably
           isn't interesting to any real user.

       modules()
           This returns a list of the names of all the installed modules.  The perl 'core' is
           given the special name 'Perl'.

       files()
           This takes one mandatory parameter, the name of a module.  It returns a list of all
           the filenames from the package.  To obtain a list of core perl files, use the module
           name 'Perl'.  Additional parameters are allowed.  The first is one of the strings
           "prog", "doc" or "all", to select either just program files, just manual files or all
           files.  The remaining parameters are a list of directories. The filenames returned
           will be restricted to those under the specified directories.

       directories()
           This takes one mandatory parameter, the name of a module.  It returns a list of all
           the directories from the package.  Additional parameters are allowed.  The first is
           one of the strings "prog", "doc" or "all", to select either just program directories,
           just manual directories or all directories.  The remaining parameters are a list of
           directories. The directories returned will be restricted to those under the specified
           directories.  This method returns only the leaf directories that contain files from
           the specified module.

       directory_tree()
           This is identical in operation to directories(), except that it includes all the
           intermediate directories back up to the specified directories.

       validate()
           This takes one mandatory parameter, the name of a module.  It checks that all the
           files listed in the modules .packlist actually exist, and returns a list of any
           missing files.  If an optional second argument which evaluates to true is given any
           missing files will be removed from the .packlist

       packlist()
           This returns the ExtUtils::Packlist object for the specified module.

       version()
           This returns the version number for the specified module.

EXAMPLE

       See the example in ExtUtils::Packlist.

AUTHOR

       Alan Burlison <Alan.Burlison@uk.sun.com>