I see comments that "an IDE can do this". Perhaps so. But there are lots of data-discovery missions where you need to learn a codebase quickly that you won't

I see comments that "an IDE can do this". Perhaps so. But there are lots of data-discovery missions where you need to learn a codebase quickly that you won't be fully compiling or building yourself. Perhaps you need to replicate an approach, or understand where something in your code needs to change in order to work with the other code that you can't touch. Tools like the OP's could become very handy in understanding a codebase without bringing the entire thing into your IDE. I agree that some pieces only are really comprehensible runtime, but I applaud tools that reflect the need to learn a codebase without necessarily having to (or being able to) bring all the code into your IDE.