I was tempted to call this a 'debugging trick of the week' but my last one was nearly 2 months ago :)

Basically the problem I had was in a CGI script I wanted to know what page was being displayed and if any utility subs were being used. I was just about to go through and add some debugging prints to the the top of each sub when I deicided that I had to be able to be lazy...

# turn on debugging
use constant DEBUG_HOOKS => 0;

if (DEBUG_HOOKS) {
    require Hook::WrapSub;
    require Devel::GetSymbols;
    require Data::Dump;
    no warnings 'once';
    my $hook_pre = sub {
            printf "<hr><pre>Calling: <b>%s</b>\nArgs: %s</pre><hr>",
                $Hook::WrapSub::name, Data::Dump::dump(@_);
        };
    my $hook_post = sub {
            printf "<hr><pre>Called: <b>%s</b> Result: %s</pre><hr>",
                $Hook::WrapSub::name,
                Data::Dump::dump(@Hook::WrapSub::result);
        };
    foreach my $sub (grep /^(page|do)_/, Devel::GetSymbols::subs()) {
        Hook::WrapSub::wrap_subs($hook_pre, $sub, $hook_post);
    }
}
[download]

Replace Data::Dump with your favorite (I prefer it as it is compact) and the grep to match your naming conventions.

gav^

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