ipre

flake.nix

@@ -3,17 +3,31 @@
 
   inputs.nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
 
-  outputs = { self, nixpkgs }: {
+  outputs = { self, nixpkgs }:
-
-    packages.x86_64-linux.utoy =
     let
       overlay = import ./nix/overlay.nix;
-        pkgs = nixpkgs.legacyPackages.x86_64-linux.extend overlay;
       settings = import ./nix/settings.nix;
       haskellDeps = import ./nix/haskell-deps.nix;
 
+      pkgs = nixpkgs.legacyPackages.x86_64-linux.extend overlay;
       haskellPackages = pkgs.haskell.packages."${settings.ghc}";
 
+      stack = pkgs.stdenv.mkDerivation {
+        pname = "stack";
+        version = "0";
+        dontUnpack = true;
+        dontConfigure = true;
+        dontBuild = true;
+        nativeBuildInputs = [ pkgs.makeWrapper ];
+        installPhase = ''
+          makeWrapper ${pkgs.stack}/bin/stack $out/bin/stack \
+            --add-flags '--no-nix --no-install-ghc'
+        '';
+      };
+    in {
+      packages.x86_64-linux.stack = stack;
+      packages.x86_64-linux.utoy =
+        let
           utoy =
             { mkDerivation }:
             mkDerivation {
@@ -43,5 +57,14 @@
           pkgs.haskell.lib.justStaticExecutables (haskellPackages.callPackage utoy {});
 
       packages.x86_64-linux.default = self.packages.x86_64-linux.utoy;
+
+      devShells.default = pkgs.mkShell {
+        buildInputs = [
+          stack
+        ];
+        shellHook = ''
+          PS1+=" (utoy)";
+        '';
+      };
   };
 }

shell.nix

@@ -5,10 +5,6 @@ let
   haskellPackages = pkgs.haskell.packages."${settings.ghc}";
 
   tools = with pkgs; [
-    # nix tools
-    niv
-    nix-tree
-
     # haskell tools
     stack
     (haskellPackages.ghcWithPackages haskellDeps)