Just one remark for better understanding: Each imported package is listed in the namespace symbol table of the importing package.

so by scanning the namespaces starting from the root "main" you should find the desired infos. Packages are keys ending with a "::". 

use Data::Dumper;
print Dumper \%:: ;

[download]
you will see entries like 'Data::' => *{'::Data::'},

so recursively you can get all the infos you want.

Cheers LanX

UPDATE:

Note:

In reply to Re: Accessing list of package names in a module by LanX
in thread Accessing list of package names in a module by FreakyGreenLeaky

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