If you look closely at the screenshot here, you’ll see where perltidy was at work.
On the left, the venerable mp32ogg, which I picked because it was the first thing I could find that was written in perl and functional.
On the right, its doppelgänger in mp32ogg.tdy, and as scrubbed clean by perltidy.
I’m familiar with tidyhtml, which — as a nonprogrammer — I consider to be as important as washing my hands before I eat.
perltidy is new to me though, most likely because … well, because I don’t program, let alone program in perl. Which I suppose makes me a bit of a barrack-room lawyer.
Purists will tell you that perltidy is a crutch, that you should code like a girl anyway, and perltidy and its ilk make you a lazy coder.
Or you could take my uneducated endorsement, which is based on the long-standing presumption that computers should be doing our dirty work, and cleaning up our mistakes for us. 😉