add nixpkgs-fmt

config/nvim/lua/core/plugin_config/lsp_config.lua

@@ -33,6 +33,14 @@ mason_null_ls.setup()
 require('lspconfig').nil_ls.setup({
   on_attach = on_attach,
   capabilities = capabilities,
+  settings = {
+    ['nil'] = {
+       testSetting = 42,
+       formatting = {
+          command = { "nixpkgs-fmt" },
+       },
+     },
+   },
 })
 
 

modules/dev/nil.nix

@@ -11,6 +11,7 @@ in
   config = mkIf cfg.enable {
     environment.systemPackages = with pkgs; [
       nil
+      nixpkgs-fmt
     ];
   };
 }

packages/.nixd.json

@@ -1,10 +0,0 @@
-{
-  "eval": {
-    "target": {
-      "args": [
-        "--expr",
-        "with import <nixpkgs> { }; callPackage ./nullpomino.nix { }"
-      ]
-    }
-  }
-}