Made a mostly pure brainfuck in haskell where output collects to list in state & tape is a zipper. Machine type is Brain. Compute returns Brain & bool for whether program halted or is wanting input to overwrite current tape value & resume pure evaluation

minihs keeps itself small, uses a stack of copies of source to implement []. Whereas the larger version parses the source to a vector of opcodes (which collapses repeated +-<>) & includes a jump table

https://github.com/serprex/bfhs/blob/master/minibf.hs