Package::Pkg - Handy package munging utilities

       Robert Krimen <robertkrimen@gmail.com>

       This software is copyright (c) 2012 by Robert Krimen.

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

perl v5.32.0                                       2021-01-05                                  Package::Pkg(3pm)

       Package::Pkg is a collection of useful, miscellaneous package-munging utilities. Functionality is
       accessed via the imported "pkg" keyword, although you can also invoke functions directly from the package
       ("Package::Pkg")

       Package::Pkg - Handy package munging utilities

       Sub::Install

       Sub::Exporter

       First, import a new keyword: "pkg"

           use Package::Pkg;

       Package name formation:

           pkg->name( 'Xy', 'A' ) # Xy::A
           pkg->name( $object, qw/ Cfg / ); # (ref $object)::Cfg

       Subroutine installation:

           pkg->install( sub { ... } => 'MyPackage::myfunction' );

           # myfunction in MyPackage is now useable
           MyPackage->myfunction( ... );

       Subroutine exporting:

           package MyPackage;

           use Package::Pkg;

           sub this { ... }

           # Setup an exporter (literally sub import { ... }) for
           # MyPackage, exporting 'this' and 'that'
           pkg->export( that => sub { ... }, 'this' );

           package main;

           use MyPackage;

           this( ... );

           that( ... );

pkg->install(...)
       Install a subroutine, similar to Sub::Install

       This method takes a number of parameters and also has a two- and three-argument form (see below)

           # Install an anonymous subroutine as Banana::magic
           pkg->install( code => sub { ... } , as => 'Banana::magic' )
           pkg->install( code => sub { ... } , into => 'Banana::magic' ) # Bzzzt! Throws an error!

           # Install the subroutine Apple::xyzzy as Banana::magic
           pkg->install( code => 'Apple::xyzzy', as => 'Banana::magic' )
           pkg->install( code => 'Apple::xyzzy', into => 'Banana', as => 'magic' )
           pkg->install( from => 'Apple', code => 'xyzzy', as => 'Banana::magic' )
           pkg->install( from => 'Apple', code => 'xyzzy', into => 'Banana', as => 'magic' )

           # Install the subroutine Apple::xyzzy as Banana::xyzzy
           pkg->install( code => 'Apple::xyzzy', as => 'Banana::xyzzy' )
           pkg->install( code => 'Apple::xyzzy', into => 'Banana' )
           pkg->install( from => 'Apple', code => 'xyzzy', as => 'Banana::xyzzy' )
           pkg->install( from => 'Apple', code => 'xyzzy', into => 'Banana' )

       With implicit "from" (via "caller()")

           package Apple;

           sub xyzzy { ... }

           # Install the subroutine Apple::xyzzy as Banana::xyzzy
           pkg->install( code => 'xyzzy', as => 'Banana::xyzzy' ) # 'from' is implicitly 'Apple'
           pkg->install( code => \&xyzzy, as => 'Banana::xyzzy' )

       Acceptable parameters are:

           code            A subroutine reference,
                           A package-with-name identifier, or
                           The name of a subroutine in the calling package

           from (optional) A package identifier
                           If :code is an identifier, then :from is the package where
                           the subroutine can be found
                           If :code is an identifier and :from is not given, then :from
                           is assumed to be the calling package (via caller())

           as              The name of the subroutine to install as. Can be a simple name
                           (when paired with :into) or a full package-with-name

           into (optional) A package identifier
                           If :as is given, then the full name of the installed
                           subroutine is (:into)::(:as)

                           If :as is not given and we can derive a simple name from
                           :code (It is a package-with-name identifier), then :as will be
                           the name identifier part of :code

   pkg->install($code=>$as)
       This is the two-argument form of subroutine installation

       Install $code subroutine as $as

           pkg->install( sub { ... } => 'Banana::xyzzy' )

           pkg->install( 'Scalar::Util::blessed' => 'Banana::xyzzy' )

           pkg->install( 'Scalar::Util::blessed' => 'Banana::' )

           pkg->install( sub { ... } => 'Banana::' ) # Bzzzt! Throws an error!

       $code should be:

       •   A CODE reference

               sub { ... }

       •   A package-with-name identifier

               Scalar::Util::blessed

       •   The name of a subroutine in the calling package

               sub xyzzy { ... }

               pkg->install( 'xyzzy' => ... )

       $as should be:

       •   A package-with-name identifier

               Acme::Xyzzy::magic

       •   A package identifier (with a trailing ::)

               Acme::Xyzzy::

   pkg->install($code=>$into,$as)
       This is the three-argument form of subroutine installation

           pkg->install( sub { ... } => 'Banana', 'xyzzy' )

           pkg->install( sub { ... } => 'Banana::', 'xyzzy' )

           pkg->install( 'Scalar::Util::blessed' => 'Banana', 'xyzzy' )

           pkg->install( 'Scalar::Util::blessed' => 'Banana::', 'xyzzy' )

       $code can be the same as the two argument form

       $into should be:

       •   A package identifier (trailing :: is optional)

               Acme::Xyzzy::

               Acme::Xyzzy

       $as should be:

       •   A name (the name of the subroutine)

               xyzzy

               magic

   $package=pkg->name($part,[$part,...,$part])
       Return a namespace composed by joining each $part with "::"

       Superfluous/redundant "::" are automatically cleaned up and stripped from the resulting $package

       If the first part leads with a "::", the the calling package will be prepended to $package

           pkg->name( 'Xy', 'A::', '::B' )      # Xy::A::B
           pkg->name( 'Xy', 'A::' )             # Xy::A::

           {
               package Zy;

               pkg->name( '::', 'A::', '::B' )  # Zy::A::B
               pkg->name( '::Xy::A::B' )        # Zy::Xy::A::B
           }

       In  addition,  if  any  part is blessed, "name" will resolve that part to the package that the part makes
       reference to:

           my $object = bless {}, 'Xyzzy';
           pkg->name( $object, qw/ Cfg / );     # Xyzzy::Cfg

       version 0.0020