Show/confirm dependency tree

[pbnjay]

Looks like the parser might need more complexity for this, but just wanted to throw out a vote for displaying a build dependency tree.

I use make for a number of ETL tasks, and it would be nice to easily see what files/targets might be touched before I do something that will take a long time.

[tj]

Haha yea that would be a stretch with the hacky thing I have now. I think make has a dry run flag, can't say I've used it but I remember the debug output was pretty rich