project template

.envrc

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+use flake

.gitignore

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+.direnv
+dist-newstyle/
+result

app/Main.hs

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+module Main where
+
+main :: IO ()
+main = putTextLn "mjau"

flake.lock

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+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1710146030,
+        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1717144377,
+        "narHash": "sha256-F/TKWETwB5RaR8owkPPi+SPJh83AQsm6KrQAlJ8v/uA=",
+        "path": "/nix/store/i1aw9jjgxcvyd642s12kw3iasmarwd42-source",
+        "rev": "805a384895c696f802a9bf5bf4720f37385df547",
+        "type": "path"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "A bare minimum Haskell flake";
+
+  inputs = {
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (sys:
+      let pkgs = import nixpkgs { system = sys; };
+          hpkgs = pkgs.haskell.packages.ghc965;
+          project = (hpkgs.callCabal2nix "gecco" ./. {}).overrideAttrs (old: old // {
+            nativeBuildInputs = old.nativeBuildInputs ++ [ pkgs.llvm_15 ];
+          });
+      in {
+        packages.default = project;
+        devShells.default = pkgs.mkShell {
+          packages = [ hpkgs.cabal-install ];
+          inputsFrom = [ project.env ];
+        };
+      }
+    );
+}

gecco.cabal

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+cabal-version:      3.0
+name:               gecco
+version:            0.1.0
+synopsis:           simple programming language to play with codegen
+license:            ISC
+author:             rachel samuelsson
+maintainer:         depsterr@protonmail.com
+category:           Language
+build-type:         Simple
+
+executable gecco
+    main-is:          Main.hs
+
+    build-depends:    base
+                    , relude
+                    , gecco
+    mixins:           base hiding (Prelude)
+                    , relude (Relude as Prelude)
+                    , relude
+    hs-source-dirs:   app
+    default-language: GHC2021
+    default-extensions:       OverloadedStrings
+    ghc-options:      -O2 -fexpose-all-unfoldings -fspecialize-aggressively -fllvm -threaded "-with-rtsopts=-A32M -N8"
+
+
+library
+    exposed-modules:  Core
+    build-depends:    base
+                    , relude
+    mixins:           base hiding (Prelude)
+                    , relude (Relude as Prelude)
+                    , relude
+    hs-source-dirs:   src
+    default-language: GHC2021
+    default-extensions:       OverloadedStrings
+    ghc-options:      -O2 -fexpose-all-unfoldings -fspecialize-aggressively -fllvm -threaded

src/Core.hs

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+module Core where
+
+test :: String
+test = "mjau"