NAME
lib::noop - no-op loading of some modules
VERSION
This document describes version 0.006 of lib::noop (from Perl distribution lib-noop), released on 2021-06-07.
SYNOPSIS
use lib::noop qw(Foo::Bar Baz);
use Foo::Bar; # now a no-op
use Qux; # load as usualDESCRIPTION
Given a list of module names, it will make subsequent loading of those modules a no-op. It works by installing a require hook in @INC that looks for the specified modules to be no-op'ed and return "1;" as the source code for those modules.
This makes loading a no-op'ed module a success, even though the module does not exist on the filesystem. And the %INC entry for the module will be added, making subsequent loading of the same module a no-op too because Perl's require will see that the entry for the module in %INC already exists.
But, since the loading is a no-op operation, no code other than "1;" is executed and if the original module contains function or package variable definition, they will not be defined.
This pragma can be used e.g. for testing.
To cancel the effect of lib::noop, you can unimport it. If you then want to actually load a module that has been no-op'ed, you have to delete its %INC entry first:
use lib::noop qw(Data::Dumper);
use Data::Dumper;
# this code will die because Data::Dumper::Dumper is not defined
BEGIN { print Data::Dumper::Dumper([1,2,3]) }
no lib::noop;
BEGIN { delete $INC{"Data/Dumper.pm"} }
use Data::Dumper;
# this code now runs ok
BEGIN { print Data::Dumper::Dumper([1,2,3]) }CONTRIBUTOR
perlancar (on netbook-dell-xps13) <perlancar@gmail.com>
HOMEPAGE
Please visit the project's homepage at https://metacpan.org/release/lib-noop.
SOURCE
Source repository is at https://github.com/perlancar/perl-lib-noop.
BUGS
Please report any bugs or feature requests on the bugtracker website https://rt.cpan.org/Public/Dist/Display.html?Name=lib-noop
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
AUTHOR
perlancar <perlancar@cpan.org>
COPYRIGHT AND LICENSE
This software is copyright (c) 2021, 2016 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.