Added configuration options (fixed)

default.nix

@@ -1,8 +1,10 @@
 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 {
@@ -13,11 +15,12 @@ let
   };
   inherit (import gitignoreSrc { inherit (pkgs) lib; }) gitignoreSource;
 
-  zig = pkgs.zig.custom {
-    sha256 = "7d715ea8948611734986d8a056fdec98d0f39b064e38efcd088823c02b1afba8";
-    version = "0.6.0+91a1c20e7";
-  };
-in
+  zig-default = pkgs.zig.master;
+in { 
+  zig ? zig-default,
+  extraConfig ? {}
+}:
+
 pkgs.stdenvNoCC.mkDerivation {
   name = "zls";
   version = "master";
@@ -34,18 +37,17 @@ in
     mkdir -p $out
     zig build install --prefix $out
 
-      # write configuration according to defaults described in README.md
     cat << EOF > $out/bin/zls.json
-        {
-          "zig_lib_path": "${zig}/lib/zig/",
-          "zig_exe_path": "${zig}/bin/zig",
-          "warn_style": false,
-          "enable_snippets": false,
-          "enable_semantic_tokens": false,
-          "operator_completions": true
-        }
+      ${builtins.toJSON {
+        zig_lib_path = "${zig}/lib/zig/";
+        zig_exe_path = "${zig}/bin/zig";
+        warn_style = false;
+        enable_snippets = false;
+        enable_semantic_tokens = false;
+        operator_completions = true;
+      } // extraConfig}
     EOF
   '';
 
-    XDG_CACHE_HOME = ".";
+  XDG_CACHE_HOME = ".cache";
 }