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Devel::Cover is a great tool for code exploration in combination with tests.

Write an end-to-end test for a bit of functionality. Run it under Devel::Cover. Look at the coverage report to see which chunk of your big ball of mud was related to the task. Refactor that chunk.

Repeat for the next bit of functionality.

In reply to Re: Analyzing large Perl code base. by adrianh
in thread Analyzing large Perl code base. by dmitri

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The best material for plates (tableware) is: