Fix Nix derivation

default.nix

@@ -1,12 +1,9 @@
 let
-  zig-overlay = import (
-    builtins.fetchGit {
+  zig-overlay = import (builtins.fetchGit {
     url = "https://github.com/arqv/zig-overlay.git";
     rev = "a56601116906a2f192702e0b97487b8e7f796fdc";
-    }
-  );
+  });
   pkgs = import <nixpkgs> { overlays = [ zig-overlay ]; };
-
   gitignoreSrc = pkgs.fetchFromGitHub {
     owner = "hercules-ci";
     repo = "gitignore";
@@ -14,40 +11,30 @@ let
     sha256 = "1npnx0h6bd0d7ql93ka7azhj40zgjp815fw2r6smg8ch9p7mzdlx";
   };
   inherit (import gitignoreSrc { inherit (pkgs) lib; }) gitignoreSource;
-
   zig-default = pkgs.zig.master;
-in { 
-  zig ? zig-default,
-  extraConfig ? {}
-}:
-
+in { zig ? zig-default, extraConfig ? { } }:
 pkgs.stdenvNoCC.mkDerivation {
   name = "zls";
   version = "master";
   src = gitignoreSource ./.;
-  nativeBuildInputs = [
-    zig
-  ];
-
+  nativeBuildInputs = [ zig ];
   dontConfigure = true;
+  dontInstall = true;
   buildPhase = ''
-    zig build -Drelease-safe=true
-  '';
-  installPhase = ''
     mkdir -p $out
-    zig build install --prefix $out
-
+    zig build install -Drelease-safe=true -Ddata_version=master --prefix $out
     cat << EOF > $out/bin/zls.json
-      ${builtins.toJSON {
+      ${
+        builtins.toJSON ({
           zig_lib_path = "${zig}/lib/zig/";
           zig_exe_path = "${zig}/bin/zig";
           warn_style = false;
           enable_snippets = false;
           enable_semantic_tokens = false;
           operator_completions = true;
-      } // extraConfig}
+        } // extraConfig)
+      }
     EOF
   '';
-
   XDG_CACHE_HOME = ".cache";
 }