Initial commit

.envrc

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+#!/usr/bin/env bash
+
+use flake

.gitignore

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+# standard haskell gitignore
+dist
+dist-*
+cabal-dev
+*.o
+*.hi
+*.hie
+*.chi
+*.chs.h
+*.dyn_o
+*.dyn_hi
+.hpc
+.hsenv
+.cabal-sandbox/
+cabal.sandbox.config
+*.prof
+*.aux
+*.hp
+*.eventlog
+.stack-work/
+cabal.project.local
+cabal.project.local~
+.HTF/
+.ghc.environment.*
+
+# ignore vscodium's local config
+.vscode/
+
+# ignore nix build system
+result*
+.direnv

Main.hs

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

flake.lock

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+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1644229661,
+        "narHash": "sha256-1YdnJAsNy69bpcjuoKdOYQX0YxZBiCYZo4Twxerqv7k=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "3cecb5b042f7f209c56ffd8371b2711a290ec797",
+        "type": "github"
+      },
+      "original": {
+        "id": "flake-utils",
+        "type": "indirect"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "narHash": "sha256-4va4MvJ076XyPp5h8sm5eMQvCrJ6yZAbBmyw95dGyw4=",
+        "path": "/nix/store/d9wpzgyjlpw1424kw2lyilah6690fnk3-source",
+        "type": "path"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "A snake game in Haskell using Yampa";
+
+  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 = "snake";
+        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;
+      });
+}

snake.cabal

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+cabal-version: 2.4
+name:          snake
+version:       0.0
+synopsis:      A snake game using Yampa
+author:        Kiana Sheibani
+license:       MIT
+build-type:    Simple
+
+executable snake
+  main-is:        Main.hs
+  other-modules:
+  build-depends: