Added configuration options (fixed)

default.nix

@@ -1,8 +1,10 @@
 let
-  zig-overlay = import (builtins.fetchGit {
-    url = "https://github.com/arqv/zig-overlay.git";
-    rev = "a56601116906a2f192702e0b97487b8e7f796fdc";
-  });
+  zig-overlay = import (
+    builtins.fetchGit {
+      url = "https://github.com/arqv/zig-overlay.git";
+      rev = "a56601116906a2f192702e0b97487b8e7f796fdc";
+    }
+  );
   pkgs = import <nixpkgs> { overlays = [ zig-overlay ]; };
 
   gitignoreSrc = pkgs.fetchFromGitHub {
@@ -13,39 +15,39 @@ let
   };
   inherit (import gitignoreSrc { inherit (pkgs) lib; }) gitignoreSource;
 
-  zig = pkgs.zig.custom {
-    sha256 = "7d715ea8948611734986d8a056fdec98d0f39b064e38efcd088823c02b1afba8";
-    version = "0.6.0+91a1c20e7";
-  };
-in
-  pkgs.stdenvNoCC.mkDerivation {
-    name = "zls";
-    version = "master";
-    src = gitignoreSource ./.;
-    nativeBuildInputs = [
-      zig
-    ];
+  zig-default = pkgs.zig.master;
+in { 
+  zig ? zig-default,
+  extraConfig ? {}
+}:
 
-    dontConfigure = true;
-    buildPhase = ''
-      zig build -Drelease-safe=true
-    '';
-    installPhase = ''
-      mkdir -p $out
-      zig build install --prefix $out
+pkgs.stdenvNoCC.mkDerivation {
+  name = "zls";
+  version = "master";
+  src = gitignoreSource ./.;
+  nativeBuildInputs = [
+    zig
+  ];
 
-      # 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
-        }
-      EOF
-    '';
+  dontConfigure = true;
+  buildPhase = ''
+    zig build -Drelease-safe=true
+  '';
+  installPhase = ''
+    mkdir -p $out
+    zig build install --prefix $out
 
-    XDG_CACHE_HOME = ".";
-  }
+    cat << EOF > $out/bin/zls.json
+      ${builtins.toJSON {
+        zig_lib_path = "${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 = ".cache";
+}