I'm doing it in scheme this year
I'm using the chez scheme compiler.
(For now) I'm not tracking the inputs, so you'll have to make an inputs directory with the contents being a set of files named dayX.
My rework for day 1 part 2 didn't allow for running both parts, and I didn't bother to do any re-work. Checkout the tag day1/part1 to see that solution.
Day 1 also uses stdin, so to run it: cat inputs/day1 | chez --script day1.scm.