Re-add nixd

Using the latest nightly version of `nixd` due to a dependency on nix
2.16.2 which is now unsecure.

flake.lock

@@ -17,6 +17,45 @@
         "type": "indirect"
       }
     },
+    "flake-parts_2": {
+      "inputs": {
+        "nixpkgs-lib": "nixpkgs-lib_2"
+      },
+      "locked": {
+        "lastModified": 1709336216,
+        "narHash": "sha256-Dt/wOWeW6Sqm11Yh+2+t0dfEWxoMxGBvv3JpIocFl9E=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "f7b3c975cf067e56e7cda6cb098ebe3fb4d74ca2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
+    "nixd-nightly": {
+      "inputs": {
+        "flake-parts": "flake-parts_2",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1710553072,
+        "narHash": "sha256-g80GlUrlCdHQVaJq9r8myCIzLmQp59e6jiGfxkodNYo=",
+        "owner": "nix-community",
+        "repo": "nixd",
+        "rev": "a436786fbd8ed5aafea4b0512cb1170a6e0e39df",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "nixd",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1709961763,
@@ -67,9 +106,28 @@
         "type": "github"
       }
     },
+    "nixpkgs-lib_2": {
+      "locked": {
+        "dir": "lib",
+        "lastModified": 1709237383,
+        "narHash": "sha256-cy6ArO4k5qTx+l5o+0mL9f5fa86tYUX3ozE1S+Txlds=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "1536926ef5621b09bba54035ae2bb6d806d72ac8",
+        "type": "github"
+      },
+      "original": {
+        "dir": "lib",
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
         "flake-parts": "flake-parts",
+        "nixd-nightly": "nixd-nightly",
         "nixpkgs": "nixpkgs",
         "nixpkgs-2305": "nixpkgs-2305"
       }

flake.nix

@@ -2,6 +2,9 @@
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
     nixpkgs-2305.url = "github:NixOS/nixpkgs/nixos-23.05";
+
+    nixd-nightly.inputs.nixpkgs.follows = "nixpkgs";
+    nixd-nightly.url = "github:nix-community/nixd";
   };
 
   outputs = inputs @ {

lib/default.nix

@@ -257,6 +257,7 @@ in rec {
   ];
 
   mkExtraPackages = {system}: let
+    inherit (inputs) nixd-nightly;
     inherit (pkgs) nodePackages lua54Packages php82Packages;
 
     pkgs = import inputs.nixpkgs {
@@ -271,6 +272,7 @@ in rec {
 
     # Language servers
     lua54Packages.luacheck
+    nixd-nightly.packages.${system}.nixd
     nodePackages."@tailwindcss/language-server"
     nodePackages.bash-language-server
     nodePackages.dockerfile-language-server-nodejs
@@ -283,9 +285,7 @@ in rec {
     nodePackages.yaml-language-server
     pkgs.gopls
     pkgs.lua-language-server
-    # pkgs.nixd
     pkgs.phpactor
-    # pkgs.rnix-lsp
     pkgs.terraform-ls
 
     # Formatters

lua/opdavies/lsp/init.lua

@@ -96,7 +96,7 @@ local servers = {
       },
     },
   },
-  rnix = {},
+  nixd = {},
   tailwindcss = {
     filetypes = { "html", "html.twig", "javascript", "typescript", "vue" },