Re: Cancel/no-op a require

[tobyink]

Try thanks.

no thanks qw(Foo Bar);
use Foo;      # no-op
require Bar;  # no-op

[sedusedan]

:) (obvious pun avoided)

My problem at hand is actually grok-ing the @INC import hook API and avoiding duplicate importing. I'm trying to add a feature to Log::Any::For::Package to install import hook. If user specifies Foo::* in the list of packages to add logging to, then after some Foo::* module is loaded, I want the hook to add logging to the newly loaded package automatically. With this:

unshift @INC, sub {
    my ($self, $name) = @_;
    
    # load the module first
    local @INC = grep { !ref($_) || $_ != $self } @INC;
    require $name;

    # add logging to the package

    # instruct Perl to not load the module again
};

Perl is loading the module twice, resulting in "subroutine X redefined" errors.

This works, BTW, though I'm not sure it is proper (or even, exactly how).

unshift @INC, sub {
    my ($self, $name) = @_;
    
    $INC{$name} = 1;

    # load the module first
    local @INC = grep { !ref($_) || $_ != $self } @INC;
    require $name;

    # add logging to the package

    return ();
};

[sedusedan]

OK, so now the correct incantation should be:

unshift @INC, sub {
    my ($self, $name) = @_;
    
    # load the module first
    local @INC = grep { !ref($_) || $_ != $self } @INC;
    require $name;

    # add logging to the package

    # ignore this hook
    my $line = 0;
    return sub {
        unless ($line++) {
            $_ = "1;\n";
            return 1;
        }
        return 0;
    }
};