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.
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::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.
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
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 -nor Acme::CM::Get:
% perl -MAcme::CM::Get=HidingModules -E'say $_->{module} for @{ $LIST->{entries} }' | cpanm -nThis 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-HidingModules
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.