NAME
    Acme::CPANModules::HidingModules - Hiding modules

VERSION
    This document describes version 0.004 of
    Acme::CPANModules::HidingModules (from Perl distribution
    Acme-CPANModules-HidingModules), released on 2020-04-30.

DESCRIPTION
    So you want to convince some Perl code that some modules that are
    actually installed, aren't? There are several ways to accomplish this,
    with different effects and levels of convincing. This list details them.

    Why?

    First of all, why would you want to do this? Almost always, the answer
    is: for testing purposes. For example, you want to make sure that your
    code can work without an optional module. Or, alternatively, you want to
    test how your code fails under the absence of certain modules.

    Making modules not loadable

    Most of the time, you just want to make certain modules not loadable.
    That is, making "require SomeModule" or "use Module" fail. To do this,
    you usually install a hook at the first element of @INC. The hook would
    die when it receives a request to load a module that you want to hide.
    Some tools that work this way include:

    lib::filter family, including its thin wrapper lib::disallow.
    lib::filter et al supports hiding modules that you specify, as well as
    hiding all core modules or all non-core modules. They also support
    recursive allowing, i.e. you want to allow Moo and all the modules that
    Moo loads, and all the modules that they load, and so on.

    Devel::Hide. Devel::Hide also works by installing a hook in @INC. It
    supports propagating the hiding to child process by setting PERL5OPT
    environment variable.

    Test::Without::Module.

    Fooling module path finders

    Depending on which tool you use to find a module's path, here are some
    patches you can load to fool the finder.

    Module::Path::Patch::Hide

    Module::Path::More::Patch::Hide

    Fooling module listers

    Depending on which tool you use to find a module's path, here are some
    patches you can load to fool the lister tool.

    Module::List::Patch::Hide

    PERLANCAR::Module::List::Patch::Hide

    Module::List::Tiny::Patch::Hide

    Module::List::Wildcard::Patch::Hide

    Hard-core hiding

    To fool code that tries to find the module files themselves without
    using any module, i.e. by iterating @INC, you will need to actually
    (temporarily) rename the module files. App::pmhiderename and
    <lib::hiderename> does this.

INCLUDED MODULES
    *   lib::filter

    *   lib::disallow

    *   Devel::Hide

    *   Test::Without::Module

    *   Module::Path::Patch::Hide

    *   Module::Path::More::Patch::Hide

    *   Module::List::Patch::Hide

    *   PERLANCAR::Module::List::Patch::Hide

    *   Module::List::Tiny::Patch::Hide

    *   Module::List::Wildcard::Patch::Hide

    *   App::pmhiderename

FAQ
  What are ways to use this module?
    Aside from reading it, you can install all the listed modules using
    cpanmodules:

        % cpanmodules ls-entries HidingModules | cpanm -n

    or Acme::CM::Get:

        % perl -MAcme::CM::Get=HidingModules -E'say $_->{module} for @{ $LIST->{entries} }' | cpanm -n

    This module also helps lcpan produce a more meaningful result for "lcpan
    related-mods" when it comes to finding related modules for the modules
    listed in this Acme::CPANModules module.

HOMEPAGE
    Please visit the project's homepage at
    <https://metacpan.org/release/Acme-CPANModules-HidingModules>.

SOURCE
    Source repository is at
    <https://github.com/perlancar/perl-Acme-CPANModules-HidingModules>.

BUGS
    Please report any bugs or feature requests on the bugtracker website
    <https://rt.cpan.org/Public/Dist/Display.html?Name=Acme-CPANModules-Hidi
    ngModules>

    When submitting a bug or request, please include a test-file or a patch
    to an existing test-file that illustrates the bug or desired feature.

SEE ALSO
    Acme::CPANModules - about the Acme::CPANModules namespace

    cpanmodules - CLI tool to let you browse/view the lists

AUTHOR
    perlancar <perlancar@cpan.org>

COPYRIGHT AND LICENSE
    This software is copyright (c) 2020, 2019 by perlancar@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.