Get path to module

mjscott2702 has asked for the wisdom of the Perl Monks concerning the following question:

Dear Monks,

I am currently trying to reverse-engineer a fairly large Perl web application I have inherited, that relies heavily on the CGI and CGI::Template modules, as well as a host of custom modules.

There is a lot of manipulation of where perl locates the custom modules, and unfortunately, they seem to be duplicated in several places.

So, my simple (hopefully) question is - how do I find which "instance" of a module is actually used?

For example, with a statement such as:

my $util = new MyApp::Utilv2;

how can I find out which one of the several possibilities was actually invoked?

Yes, that should probably be written as

my $util = MyApp::Utilv2->new()

but like I said, I inherited this!

Utilities such as perlwhich etc probably won't help me here, since so much manipulation of @INC, use lib etc is going on.

Comment on Get path to module Select or Download Code

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Re: Get path to module by Anonymous Monk on Sep 28, 2010 at 08:56 UTC
`$ perl -le " use strict; print for %INC" strict.pm C:/perl/5.10.1/lib/strict.pm` [download]	[reply] [d/l]
Re^2: Get path to module by duelafn (Parson) on Sep 28, 2010 at 11:56 UTC
OP got it, but just to be a bit more explicit for future monks (see also %INC): `use MyApp::Utilv2; print qq!MyApp::Utilv2 was found at '$INC{"MyApp/Utilv2.pm"}'\n!;` [download] Good Day, Dean	[reply] [d/l]
Re^3: Get path to module by spazm (Monk) on Sep 29, 2010 at 01:22 UTC
good old `%INC`, `@INC`'s nerdy kid brother -- always knows the scoop.	[reply] [d/l] [select]
Re^2: Get path to module by mjscott2702 (Pilgrim) on Sep 28, 2010 at 09:21 UTC
Perfect - just what I needed! Thanks!	[reply]
Re: Get path to module by mjscott2702 (Pilgrim) on Sep 28, 2010 at 08:47 UTC
I should add - I am looking for something that is fairly generic - I want to avoid locating all possibilities, and adding in some code to make them identify themselves. The constructor simply returns an empty blessed hash. Additionally, running as a CGI application makes debugging difficult, so ideally I just want to add in some debug print statements (to a file) around the constructor call.	[reply]