i see why nixd is in unstable

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

@@ -30,9 +30,17 @@ local capabilities = require("cmp_nvim_lsp").default_capabilities()
 mason_null_ls.setup()
 
 -- funny lsp config stuff
-require('lspconfig').nixd.setup({
+require('lspconfig').nil_ls.setup({
   on_attach = on_attach,
   capabilities = capabilities,
+  settings = {
+      ['nil'] = {
+        testSetting = 42,
+        formatting = {
+          command = { "nixpkgs-fmt" },
+       },
+     },
+   },
 })
 
 

hosts/sakotop/configuration.nix

@@ -58,7 +58,8 @@
         nvim.enable = true;
         vscode.enable = true;
       };
-      nixd.enable = true;
+      nixd.enable = false;
+      nil.enable = true;
       cc.enable = true;
       javascript.enable = true;
       python.enable = true;

modules/dev/nil.nix

@@ -0,0 +1,16 @@
+{ outputs, options, config, lib, pkgs, ...}:
+with lib;
+let
+  cfg = config.modules.dev.nil;
+in
+{
+  options.modules.dev.nil = {
+    enable = mkEnableOption false;
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = with pkgs; [
+      nil
+    ];
+  };
+}