relatedly, i have been using literate haskell to document my advent of code journey this year:

- day 5's solution for example: https://aoc.oppi.li/2.3-day-5.html#day-5

- literate haskell source: https://tangled.org/oppi.li/aoc/blob/main/src/2025/05.lhs

the book/site is "weaved" with pandoc, the code is "tangled" with a custom markdown "unlit" program that is passed to GHC.