I've written a blog post about analyzing a large number of Perl scripts and modules interacting with each other. I'm fairly new to Perl, still learning about different ways to tackle problems I face. So, any feedback is welcome! :)

http://nitingargblog.wordpress.com/2012/09/16/ocean-of-perls

Basically, I wanted to add trace statements at the beginning of a script, and also when its constituent subroutines are called. I tried three approaches for that:

1. Parsing with regular expressions: The first and most crude approach was to modify all these scripts, by parsing them, finding subroutine definitions, and adding a print statement right after the beginning of each. ...

2. PPI Module: PPI::Document -> find(‘PPI::Statement::Sub’) ... 
for my $child ( $sub->children ) {
 $child->start->add_content($caller)
 if ref $child eq "PPI::Structure::Block";
}

[download]
3. Hook::LexWrap Module: Adding pre-wrappers to subroutines: 
my @all_subs = qw (sub1 sub2);
for my $sub (@all_subs) {
 wrap $sub, pre => sub {
 print "Calling '$sub' in file: $0\n";
 };
}

[download]

In reply to Analyzing Perl Code by nitin1704

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