Package up day 16 in a Nix flake/derivation

Author: fwcd

.github/workflows/run.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         os: ['ubuntu-latest', 'macos-latest']
-        day: ['01', '02', '03', '04', '05', '06', '07', '08', '09', '10', '11', '12', '13', '14', '15']
+        day: ['01', '02', '03', '04', '05', '06', '07', '08', '09', '10', '11', '12', '13', '14', '15', '16']
         exclude:
         # TODO: Investigate why building Zig on macOS fails
         # https://github.com/fwcd/advent-of-code-2024/actions/runs/12202208638/job/34042374507

README.md

@@ -21,7 +21,7 @@ My solutions to the [Advent of Code 2024](https://adventofcode.com/2024), writte
 - [x] [**Day 13**](day13): [Python](day13/src/day13.py)
 - [x] [**Day 14**](day14): [Haskell](day14/src/Day14.hs)
 - [x] [**Day 15**](day15): [C++](day15/src/day15.cpp)
-- [ ] [**Day 16**](day16): [Kotlin](day16/src/day16.kts)
+- [x] [**Day 16**](day16): [Kotlin](day16/src/day16.kts)
 
 ## Development
 

day16/derivation.nix

@@ -0,0 +1,19 @@
+{ stdenv, kotlin }:
+  stdenv.mkDerivation {
+    name = "advent-of-code-2024-day16";
+    src = ./src;
+
+    buildInputs = [
+      kotlin
+    ];
+
+    installPhase = ''
+      mkdir -p $out/{bin,share}
+      cp day16.kts $out/share
+
+      cat <<EOF > $out/bin/day16
+      exec "${kotlin.outPath}/bin/kotlin" "\$(dirname "\$0")/../share/day16.kts" "\$@"
+      EOF
+      chmod +x $out/bin/day16
+    '';
+  }

day16/flake.lock

@@ -0,0 +1,28 @@
+{
+  description = "Advent of Code 2024 - Day 16 solution";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  };
+
+  outputs = { self, nixpkgs }:
+    let
+      supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ];
+      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+    in {
+      packages = forAllSystems (system:
+        let
+          pkgs = import nixpkgs { inherit system; };
+        in {
+          default = pkgs.callPackage ./derivation.nix {};
+        }
+      );
+
+      apps = forAllSystems (system: {
+        default = {
+          type = "app";
+          program = "${self.packages.${system}.default}/bin/day16";
+        };
+      });
+    };
+}

day16/flake.nix

@@ -124,6 +124,7 @@
       "codemirror": "kotlin",
       "name": "Kotlin"
     },
-    "path": "day16/src/day16.kts"
+    "path": "day16/src/day16.kts",
+    "completed": true
   }
 ]