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Re: Cancel/no-op a require

by tobyink (Abbot)
on Dec 07, 2012 at 13:16 UTC ( #1007733=note: print w/ replies, xml ) Need Help??


in reply to Cancel/no-op a require

Try thanks.

no thanks qw(Foo Bar); use Foo; # no-op require Bar; # no-op
perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'


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Re^2: Cancel/no-op a require
by sedusedan (Monk) on Dec 07, 2012 at 13:36 UTC

    :) (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 (); };

      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; } };

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