muhahaha

.envrc

@@ -0,0 +1,2 @@
+nix_direnv_watch_file *.cabal
+use flake

.gitignore

@@ -22,4 +22,4 @@ cabal.project.local
 cabal.project.local~
 .HTF/
 .ghc.environment.*
-
+.direnv/

flake.lock

@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1692799911,
+        "narHash": "sha256-3eihraek4qL744EvQXsK1Ha6C3CR7nnT8X2qWap4RNk=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "f9e7cf818399d17d347f847525c5a5a8032e4e44",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1693099187,
+        "narHash": "sha256-FXCc6OIghv9k4xYOhSMZI6bj7o56S8BJKzKtTKzdUVQ=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "cf2004afe4d4b95a295c63c911e949e40915eedb",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "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

@@ -0,0 +1,80 @@
+{
+  description = "Example Haskell flake showing overrides and adding stuff to the dev shell";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  nixConfig.allow-import-from-derivation = true; # cabal2nix uses IFD
+
+  outputs = { self, nixpkgs, flake-utils }:
+    let
+      ghcVer = "ghc902";
+      makeHaskellOverlay = overlay: final: prev: {
+        haskell = prev.haskell // {
+          packages = prev.haskell.packages // {
+            ${ghcVer} = prev.haskell.packages."${ghcVer}".override (oldArgs: {
+              overrides =
+                prev.lib.composeExtensions (oldArgs.overrides or (_: _: { }))
+                  (overlay prev);
+            });
+          };
+        };
+      };
+
+      out = system:
+        let
+          pkgs = import nixpkgs {
+            inherit system;
+            overlays = [ self.overlays.default ];
+            config.allowBroken = true;
+          };
+
+        in
+        {
+          packages = rec {
+            default = sample;
+            sample = pkgs.haskell.packages.${ghcVer}.sample;
+          };
+
+          checks = {
+            inherit (self.packages.${system}) sample;
+          };
+
+          # for debugging
+          # inherit pkgs;
+
+          devShells.default =
+            let haskellPackages = pkgs.haskell.packages.${ghcVer};
+            in
+            haskellPackages.shellFor {
+              packages = p: [ self.packages.${system}.sample ];
+              withHoogle = true;
+              buildInputs = with haskellPackages; [
+                haskell-language-server
+                cabal-install
+              ];
+              # Change the prompt to show that you are in a devShell
+              # shellHook = "export PS1='\\e[1;34mdev > \\e[0m'";
+            };
+        };
+    in
+    flake-utils.lib.eachDefaultSystem out // {
+      # this stuff is *not* per-system
+      overlays = {
+        default = makeHaskellOverlay (prev: hfinal: hprev:
+          let hlib = prev.haskell.lib; in
+          {
+            sample = hprev.callCabal2nix "sample" ./. { };
+
+            # here's how to do hacks to the package set
+            # don't run the test suite
+            # fast-tags = hlib.dontCheck hprev.fast-tags;
+            #
+            # don't check version bounds
+            # friendly = hlib.doJailbreak hprev.friendly;
+          });
+      };
+    };
+}

src/Example/Project.hs

@@ -1,6 +1,6 @@
 module Example.Project (topEntity, plus) where
 
-import Clash.Prelude
+import           Clash.Prelude
 
 -- | Add two numbers. Example:
 --

stack.yaml

@@ -1,7 +0,0 @@
-resolver: lts-19.33
-
-extra-deps:
-  - clash-ghc-1.6.4
-  - clash-prelude-1.6.4
-  - clash-lib-1.6.4
-  - concurrent-supply-0.1.8

stack.yaml.lock

@@ -1,40 +0,0 @@
-# This file was autogenerated by Stack.
-# You should not edit this file by hand.
-# For more information, please see the documentation at:
-#   https://docs.haskellstack.org/en/stable/lock_files
-
-packages:
-- completed:
-    hackage: clash-ghc-1.6.4@sha256:43e4c9c949bf9623633f08bb09bb4495578b517be4e99140d9ea22dd2a9cd13b,9042
-    pantry-tree:
-      sha256: 9484d37cd6c8cb0217a02cf020b6398dbe1a68fa332472b40cfb511ce54a743a
-      size: 3634
-  original:
-    hackage: clash-ghc-1.6.4
-- completed:
-    hackage: clash-prelude-1.6.4@sha256:67b5c26ad7c712e23f5d54187d691cbb007931a89b4aabd4a738c307d71b2a27,17249
-    pantry-tree:
-      sha256: b12774016a4f9bd456ecdf7bc1e5182d33ef4ac9e16db0f344d27189a26bfe2d
-      size: 13292
-  original:
-    hackage: clash-prelude-1.6.4
-- completed:
-    hackage: clash-lib-1.6.4@sha256:336e57d424852f2ad9285b6fa820e634f32d39d52755d3245d5f4ac04ea37f85,13688
-    pantry-tree:
-      sha256: 750ffc9d2f5ed3690f6a2a7da46090970594dbbcf8a6b55d785e8f809b4dfbf1
-      size: 22460
-  original:
-    hackage: clash-lib-1.6.4
-- completed:
-    hackage: concurrent-supply-0.1.8@sha256:9373f4868ad28936a7b93781b214ef4afdeacf377ef4ac729583073491c9f9fb,1627
-    pantry-tree:
-      sha256: bdfaa167ae3249f858ba248aea2e9b97ab9b13af6e68c73b7c3192e717e11b83
-      size: 400
-  original:
-    hackage: concurrent-supply-0.1.8
-snapshots:
-- completed:
-    sha256: 6d1532d40621957a25bad5195bfca7938e8a06d923c91bc52aa0f3c41181f2d4
-    size: 619204
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/19/33.yaml
-  original: lts-19.33