my main goal is to document code, understand it's flow and based on that create another functionality

I've kept a list of PM nodes over the years related to this topic.

Legacy Code

• Swallowing an elephant in 10 easy steps by ELISHEVA (Describes how she tackles big problems to keep moving forward rather than going around in circles)
• Strategies for maintenance of horrible code?
• Perl archeology: Need help in refactoring of old Perl code that does not use strict
• Moving from scripting to programming
• Code Structure Changes
• Object-oriented Reengineering Patterns book now available as a free download

• Nobody Expects the Agile Imposition (Part VI): Architecture (discusses refactoring vs rewriting of very large code bases)
• The Boy Scout Rule (apply the Boy Scout rule of "leave the campground cleaner than when you found it" to your code)

Adding Tests to Legacy Code

• Looking for help for unit tests and code coverage on an existing perl script
• Needing help on testing
• How do you test end-user scripts?

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