Initial commit

flake.nix

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+{
+  description = "A simple haskell template";
+
+  outputs = { self }: {
+
+    templates.haskell = {
+      description = "A haskell executable";
+      path = ./template;
+    };
+
+    defaultTemplate = self.templates.haskell;
+  };
+}

template/Main.hs

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+module Main where
+
+main :: IO ()
+main = undefined

template/flake.nix

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+{
+  description = "A haskell executable";
+
+  outputs = { self, nixpkgs, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        overlays = [];
+        pkgs = import nixpkgs { inherit system overlays; config.allowBroken = true; };
+        
+        # package/executable name
+        packageName = "";
+        execName = packageName;
+        
+        # version of ghc used
+        hp = pkgs.haskellPackages;
+        
+        project = returnShellEnv:
+          hp.developPackage {
+            inherit returnShellEnv;
+            name = packageName;
+            root = ./.;
+            withHoogle = false;
+            overrides = self: super: with pkgs.haskell.lib; {
+              # Use callCabal2nix to override Haskell dependencies here
+              # cf. https://tek.brick.do/K3VXJd8mEKO7
+              # Example: 
+              # > NanoID = self.callCabal2nix "NanoID" inputs.NanoID { };
+              # Assumes that you have the 'NanoID' flake input defined.
+            };
+            modifier = drv:
+              pkgs.haskell.lib.addBuildTools drv (with hp; [
+                # Specify your build/dev dependencies here.
+              ]);
+          };
+      in
+      {
+        # Used by `nix build` & `nix run` (prod exe)
+        defaultPackage = project false;
+
+        defaultApp = {
+          type = "app";
+          program = "${self.defaultPackage.${system}}/bin/${execName}";
+        };
+
+        # Used by `nix develop` (dev shell)
+        devShell = project true;
+      });
+}

template/project.cabal

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+cabal-version: 2.4
+name:
+version:       0.0
+synopsis:
+author:
+license:
+build-type:    Simple
+
+library
+  build-depends:
+  exposed-modules:
+
+executable
+  main-is:        Main.hs
+  other-modules:
+  build-depends: