Setup Scala

flake.nix

@@ -1,57 +1,20 @@
 {
   inputs = {
-    opam-nix.url = "github:tweag/opam-nix";
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
     flake-utils.url = "github:numtide/flake-utils";
-    nixpkgs.follows = "opam-nix/nixpkgs";
   };
-  outputs = { self, flake-utils, opam-nix, nixpkgs }@inputs:
-    flake-utils.lib.eachDefaultSystem (system:
+
+  outputs = { self, nixpkgs, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
       let
         pkgs = nixpkgs.legacyPackages.${system};
-        on = opam-nix.lib.${system};
-        localPackagesQuery = builtins.mapAttrs (_: pkgs.lib.last)
-          (on.listRepo (on.makeOpamRepo ./.));
-        devPackagesQuery = {
-          # You can add "development" packages here. They will get added to the devShell automatically.
-          ocaml-lsp-server = "*";
-          ocamlformat = "*";
-          utop = "*";
-          dune-release = "*";
-        };
-        query = devPackagesQuery // {
-          ## You can force versions of certain packages here, e.g:
-          ## - force the ocaml compiler to be taken from opam-repository:
-          ocaml-base-compiler = "*";
-          ## - or force the compiler to be taken from nixpkgs and be a certain version:
-          # ocaml-system = "4.14.0";
-          ## - or force ocamlfind to be a certain version:
-          # ocamlfind = "1.9.2";
-        };
-        scope = on.buildDuneProject { } "tanenbaum"  ./. query;
-        overlay = final: prev:
-          {
-            # You can add overrides here
-          };
-        scope' = scope.overrideScope' overlay;
-        # Packages from devPackagesQuery
-        devPackages = builtins.attrValues
-          (pkgs.lib.getAttrs (builtins.attrNames devPackagesQuery) scope');
-        # Packages in this workspace
-        packages =
-          pkgs.lib.getAttrs (builtins.attrNames localPackagesQuery) scope';
-      in {
-        legacyPackages = scope';
 
-        inherit packages;
-
-        ## If you want to have a "default" package which will be built with just `nix build`, do this instead of `inherit packages;`:
-        # packages = packages // { default = packages.<your default package>; };
-
-        devShells.default = pkgs.mkShell {
-          inputsFrom = builtins.attrValues packages;
-          buildInputs = devPackages ++ [
-            # You can add packages from nixpkgs here
-          ];
+      in
+      {
+        devShell = pkgs.mkShell {
+          buildInputs = [ pkgs.scala-cli ];
         };
-      });
+      }
+    );
 }