The everywhere trick

After reading Eric's Plack blog series today, I also stumbled upon his other blog post about a nice little Devel::Dwarn trick.

I also pepper use Data::Dump; dd $something; in my code a lot! So many that I created DD and DDC to lessen the typing. But this trick is better because I don't have to put the use statement at all. Plus I get some safety (I do accidentally check in these debugging print statements from time to time).

But putting -MData::Dump or -MData::Dump::Color on the command-line or PERL5OPT will only work for the code in the main package. What if I pepper debugging statements in some module? That's where another nice module written by Brock Wilcox comes in: everywhere. This module lets you use a module, well, everywhere. It works by installing a coderef at the start of @INC that will trap every require statement and import the modules you want to import everywhere to the target module. By the way, this @INC handler trick is also employed by some other cool modules, among others: App::FatPacker and PAR.

So now you can just put "dd" statements in your modules and test your application with:

perl -Meverywhere=Data::Dump

or some shorter alias which I'm sure you'll soon create if you use this often enough.

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About Steven Haryanto

user-pic A programmer (mostly Perl 5 nowadays). My CPAN ID: SHARYANTO. I'm sedusedan on perlmonks. My twitter is stevenharyanto (but I don't tweet much). Follow me on github: sharyanto.