Beefy Boxes and Bandwidth Generously Provided by pair Networks
We don't bite newbies here... much
 
PerlMonks  

Re^2: Cancel/no-op a require

by sedusedan (Monk)
on Dec 07, 2012 at 13:36 UTC ( #1007736=note: print w/ replies, xml ) Need Help??


in reply to Re: Cancel/no-op a require
in thread Cancel/no-op a require

:) (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 (); };


Comment on Re^2: Cancel/no-op a require
Select or Download Code
Re^3: Cancel/no-op a require
by sedusedan (Monk) on Dec 07, 2012 at 14:06 UTC

    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; } };

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1007736]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others avoiding work at the Monastery: (9)
As of 2014-10-20 14:16 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    For retirement, I am banking on:










    Results (77 votes), past polls