First template

aoc23/Main.hs

@@ -0,0 +1,8 @@
+module Main where
+
+import Day1
+
+main :: IO ()
+main = do
+  putStrLn "Hello"
+  putStrLn Day1.resultA

aoc23/flake.nix

@@ -0,0 +1,35 @@
+{
+  description = "A Hello World for AoC";
+  inputs.nixpkgs.url = "nixpkgs";
+  outputs = { self, nixpkgs }:
+    let
+      supportedSystems = [ "x86_64-linux" "x86_64-darwin" ];
+      forAllSystems = f: nixpkgs.lib.genAttrs supportedSystems (system: f system);
+      nixpkgsFor = forAllSystems (system: import nixpkgs {
+        inherit system;
+        overlays = [ self.overlay ];
+      });
+    in
+    {
+      overlay = (final: prev: {
+        aoc23 = final.haskellPackages.callCabal2nix "aoc23" ./. {};
+      });
+      packages = forAllSystems (system: {
+         aoc23 = nixpkgsFor.${system}.aoc23;
+      });
+      defaultPackage = forAllSystems (system: self.packages.${system}.aoc23);
+      checks = self.packages;
+      devShell = forAllSystems (system: let haskellPackages = nixpkgsFor.${system}.haskellPackages;
+        in haskellPackages.shellFor {
+          packages = p: [self.packages.${system}.aoc23];
+          withHoogle = true;
+          buildInputs = with haskellPackages; [
+            haskell-language-server
+            ghcid
+            cabal-install
+          ];
+        # Change the prompt to show that you are in a devShell
+        shellHook = "export PS1='\\e[1;34mdev > \\e[0m'";
+        });
+  };
+}

aoc23/package.yaml

@@ -0,0 +1,18 @@
+name: aoc23
+
+ghc-options: -Wall -threaded
+
+dependencies:
+  - base == 4.*
+
+executables:
+  aoc23:
+    main: Main.hs
+    dependencies:
+      - aoc23
+
+library:
+  source-dirs: src
+  exposed-modules:
+    - Day1
+

aoc23/src/Day1.hs

@@ -0,0 +1,3 @@
+module Day1 where
+
+resultA = "Day1 - part A"

flake.nix

@@ -0,0 +1,18 @@
+{
+  description = "Samae's collection of flake templates";
+
+  outputs = { self }: {
+
+    templates = {
+
+      haskell-aoc = {
+        path = ./aoc23;
+        description = "A full-featured, small nix+haskell AoC template";
+      };
+
+    };
+
+    defaultTemplate = self.templates.haskell-aoc;
+
+  };
+}