tvl-depot/tools/aoc2019/default.nix

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# Solutions for Advent of Code 2019, written in Emacs Lisp.
#
# For each day a new file is created as "solution-day$n.el".
{ pkgs, ... }:
let
inherit (builtins) attrNames filter head listToAttrs match readDir;
dir = readDir ./.;
matchSolution = match "solution-(.*)\.el";
isSolution = f: (matchSolution f) != null;
getDay = f: head (matchSolution f);
solutionFiles = filter (e: dir."${e}" == "regular" && isSolution e) (attrNames dir);
solutions = map (f: let day = getDay f; in {
name = day;
value = pkgs.writeElispBin {
name = "aoc2019";
deps = p: with p; [ dash s ht ];
src = ./. + ("/" + f);
};
}) solutionFiles;
in listToAttrs solutions