Simplify nix setup

README.md

@@ -32,3 +32,7 @@ $ nix develop
 $ nix run .#stack
 $ nix run .#ghc
 ```
+
+## TODO
+
+- [ ] Benchmark, profile and optimize search

flake.nix

@@ -5,85 +5,32 @@
 
   outputs = { self, nixpkgs }:
     let
-      settings = import ./nix/settings.nix;
-      haskellDeps = import ./nix/haskell-deps.nix;
-
       pkgs = nixpkgs.legacyPackages.x86_64-linux;
-      haskellPackages = pkgs.haskell.packages."${settings.ghc}";
 
-      ghc = haskellPackages.ghcWithPackages haskellDeps;
-
-      # Wrap stack to disable its slow Nix integration.
-      # Instead, make it use the GHC defined above.
-      stack = pkgs.stdenv.mkDerivation {
-        name = "stack";
-
-        # The build is simply a call to makeWrapper, so we don't have to
-        # do any of the typical build steps.
-        phases = [ "installPhase" ];
-
-        nativeBuildInputs = [ pkgs.makeWrapper ];
-        # makeBinaryWrapper creates a stack executable for us that uses
-        # the GHC defined in this file.
-        installPhase = ''
-          makeWrapper ${pkgs.stack}/bin/stack $out/bin/stack \
-            --prefix PATH : ${ghc}/bin \
-            --add-flags '--no-nix --system-ghc --no-install-ghc'
-        '';
+      utoy = pkgs.haskellPackages.developPackage {
+        root = ./.;
       };
-
-      utoy = pkgs.haskell.lib.justStaticExecutables (haskellPackages.callPackage
-        ({ mkDerivation }:
-        mkDerivation {
-          # Keep this in sync with package.yaml
-          version = "0.6.1";
-          pname = "utoy";
-          license = pkgs.lib.licenses.mit;
-          src =
-            # We only need these files for building:
-            let
-              whitelist = [
-                ./LICENSE
-                ./utoy.cabal
-                ./Setup.hs
-                ./app
-                ./src
-                ./static
-                ./test
-              ];
-            in
-              pkgs.lib.sources.cleanSourceWith {
-                src = ./.;
-                filter = path: _type: pkgs.lib.any (prefix: pkgs.lib.hasPrefix (toString prefix) path) whitelist;
-              };
-          libraryHaskellDepends = haskellDeps haskellPackages;
-        }) {});
     in {
-      packages.x86_64-linux = {
-        inherit ghc;
-        inherit stack;
-
+      packages.x86_64-linux = rec {
         docker =
           pkgs.dockerTools.buildImage {
             name = "git.pbrinkmeier.de/paul/utoy";
             tag = utoy.version;
-            config.Cmd = [ "${utoy}/bin/utoy" ];
+            config.Cmd = [ "${pkgs.haskell.lib.justStaticExecutables utoy}/bin/utoy" ];
           };
 
         default = utoy;
       };
 
-      devShells.x86_64-linux.default = pkgs.mkShell {
-        packages = [
-          stack
-          ghc
-
-          haskellPackages.haskell-language-server
-          haskellPackages.implicit-hie
-        ];
-        shellHook = ''
-          PS1+="(utoy) ";
-        '';
-      };
+      devShells.x86_64-linux.default =
+        (pkgs.haskellPackages.developPackage {
+          root = ./.;
+          modifier = drv:
+            pkgs.haskell.lib.addBuildTools drv [
+              pkgs.cabal-install
+              pkgs.haskellPackages.implicit-hie
+              pkgs.haskell-language-server
+            ];
+        }).env;
   };
 }

nix/haskell-deps.nix

@@ -1,13 +0,0 @@
-haskellPackages: with haskellPackages; [
-  attoparsec
-  blaze-html
-  bytestring
-  file-embed
-  http-media
-  servant-server
-  text
-  unicode-data
-  unicode-data-names
-  wai
-  warp
-]

nix/settings.nix

@@ -1,5 +0,0 @@
-{
-  # GHC version to use with Nix.
-  # Should match the one in stack.yaml.
-  ghc = "ghc944";
-}

package.yaml

@@ -1,70 +0,0 @@
-# Adapted from new-template.hsfiles
-
-name:                utoy
-# Keep this in sync with the version in flake.nix.
-version:             0.6.1
-git:                 "https://git.pbrinkmeier.de/paul/utoy"
-license:             MIT
-author:              "Paul Brinkmeier"
-maintainer:          "hallo@pbrinkmeier.de"
-copyright:           "2023 Paul Brinkmeier"
-
-extra-source-files:
-- README.md
-- static/utoy.css
-
-dependencies:
-- base >= 4.7 && < 5
-- attoparsec
-- text
-
-ghc-options:
-- -Wall
-- -Wcompat
-- -Widentities
-- -Wincomplete-record-updates
-- -Wincomplete-uni-patterns
-- -Wmissing-export-lists
-- -Wmissing-home-modules
-- -Wpartial-fields
-- -Wredundant-constraints
-
-library:
-  source-dirs: src
-
-executables:
-  utoy:
-    main:                Main.hs
-    source-dirs:         app
-    ghc-options:
-    - -threaded
-    - -rtsopts
-    - -with-rtsopts=-N
-    dependencies:
-    - utoy
-    - blaze-html
-    - bytestring
-    - file-embed
-    - http-media
-    - servant-server
-    - text
-    - unicode-data
-    - unicode-data-names
-    - wai
-    - warp
-    # Fix "Multiple files use the same module name", see
-    # https://stackoverflow.com/questions/67519851/multiple-files-use-the-same-module-name
-    when:
-    - condition: false
-      other-modules: Paths_utoy
-
-tests:
-  utoy-test:
-    main:                Spec.hs
-    source-dirs:         test
-    ghc-options:
-    - -threaded
-    - -rtsopts
-    - -with-rtsopts=-N
-    dependencies:
-    - utoy

stack.yaml

@@ -1,5 +0,0 @@
-# You can get a working environment using nix develop.
-# Keep this in sync with nix/settings.nix
-resolver: ghc-9.4.4
-packages:
-- .