init nix-features

package.nix

@@ -0,0 +1,53 @@
+{
+  esbuild,
+  elmPackages,
+  haskellPackages,
+  stdenv,
+  ...
+}: let
+  ghcExeOptions = "-Wall -Wcompact -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints -threaded -rtsopts -with-rtsopts=-N";
+  ghcPackages = p: [
+    p.aeson
+    p.blaze-html
+    p.blaze-markup
+    p.directory
+    p.elm-street
+    p.http-types
+    p.scotty
+    p.text
+    p.wai-extra
+    p.warp
+  ];
+  elmConfig = elmPackages.fetchElmDeps {
+    elmPackages = import ./frontend/elm-srcs.nix;
+    elmVersion = "0.19.1";
+    registryDat = ./frontend/registry.dat;
+  };
+in
+  stdenv.mkDerivation {
+    pname = "elmskell";
+    version = "0.1.0";
+    src = ./src;
+    nativeBuildInputs = [
+      esbuild
+      (haskellPackages.ghcWithPackages ghcPackages)
+      elmPackages.elm
+    ];
+    buildInputs = [
+    ];
+    configurePhase = ''
+      ${elmConfig}
+    '';
+    buildPhase = ''
+      ghc -v ${ghcExeOptions} ./Main.hs -o ./main
+      elm make ./Main.elm --optimize --output=tmp.js
+      esbuild ./tmp.js --minify --target=es5 --outfile=main.js
+    '';
+    installPhase = ''
+      mkdir -p $out/bin
+      mkdir -p $out/src
+      cp ./main $out/bin/elmskell
+      cp ./main.js $out/src/main.js
+      cp ./init.js $out/src/init.js
+    '';
+  }