feat: Switch to nil LSP for code actions

I love that nixd gets more options but I really need the code actions.

flake.lock

@@ -108,39 +108,6 @@
         "type": "indirect"
       }
     },
-    "flake-parts_4": {
-      "inputs": {
-        "nixpkgs-lib": "nixpkgs-lib_2"
-      },
-      "locked": {
-        "lastModified": 1733312601,
-        "narHash": "sha256-4pDvzqnegAfRkPwO3wmwBhVi/Sye1mzps0zHWYnP88c=",
-        "owner": "hercules-ci",
-        "repo": "flake-parts",
-        "rev": "205b12d8b7cd4802fbcb8e8ef6a0f1408781a4f9",
-        "type": "github"
-      },
-      "original": {
-        "owner": "hercules-ci",
-        "repo": "flake-parts",
-        "type": "github"
-      }
-    },
-    "flake-root": {
-      "locked": {
-        "lastModified": 1723604017,
-        "narHash": "sha256-rBtQ8gg+Dn4Sx/s+pvjdq3CB2wQNzx9XGFq/JVGCB6k=",
-        "owner": "srid",
-        "repo": "flake-root",
-        "rev": "b759a56851e10cb13f6b8e5698af7b59c44be26e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "srid",
-        "repo": "flake-root",
-        "type": "github"
-      }
-    },
     "flake-utils": {
       "inputs": {
         "systems": "systems"
@@ -383,27 +350,6 @@
         "type": "github"
       }
     },
-    "nixd": {
-      "inputs": {
-        "flake-parts": "flake-parts_4",
-        "flake-root": "flake-root",
-        "nixpkgs": "nixpkgs_2",
-        "treefmt-nix": "treefmt-nix_2"
-      },
-      "locked": {
-        "lastModified": 1736350641,
-        "narHash": "sha256-7tocojT95MzQb6BczrFd+W7CyNxGqe5Qg8aicqA+yLI=",
-        "owner": "nix-community",
-        "repo": "nixd",
-        "rev": "6e581414b2f4c7834aef340118ea7134de98aae3",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-community",
-        "repo": "nixd",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1718714799,
@@ -432,18 +378,6 @@
         "url": "https://github.com/NixOS/nixpkgs/archive/eb9ceca17df2ea50a250b6b27f7bf6ab0186f198.tar.gz"
       }
     },
-    "nixpkgs-lib_2": {
-      "locked": {
-        "lastModified": 1733096140,
-        "narHash": "sha256-1qRH7uAUsyQI7R1Uwl4T+XvdNv778H0Nb5njNrqvylY=",
-        "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/5487e69da40cbd611ab2cadee0b4637225f7cfae.tar.gz"
-      },
-      "original": {
-        "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/5487e69da40cbd611ab2cadee0b4637225f7cfae.tar.gz"
-      }
-    },
     "nixpkgs-stable": {
       "locked": {
         "lastModified": 1720386169,
@@ -461,22 +395,6 @@
       }
     },
     "nixpkgs_2": {
-      "locked": {
-        "lastModified": 1734435836,
-        "narHash": "sha256-kMBQ5PRiFLagltK0sH+08aiNt3zGERC2297iB6vrvlU=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "4989a246d7a390a859852baddb1013f825435cee",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "nixpkgs_3": {
       "locked": {
         "lastModified": 1736701207,
         "narHash": "sha256-jG/+MvjVY7SlTakzZ2fJ5dC3V1PrKKrUEOEE30jrOKA=",
@@ -515,8 +433,7 @@
         "neotab-nvim": "neotab-nvim",
         "neovim-nightly": "neovim-nightly",
         "nerdy-nvim": "nerdy-nvim",
-        "nixd": "nixd",
-        "nixpkgs": "nixpkgs_3",
+        "nixpkgs": "nixpkgs_2",
         "nvim-emmet": "nvim-emmet"
       }
     },
@@ -555,27 +472,6 @@
         "repo": "treefmt-nix",
         "type": "github"
       }
-    },
-    "treefmt-nix_2": {
-      "inputs": {
-        "nixpkgs": [
-          "nixd",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1734704479,
-        "narHash": "sha256-MMi74+WckoyEWBRcg/oaGRvXC9BVVxDZNRMpL+72wBI=",
-        "owner": "numtide",
-        "repo": "treefmt-nix",
-        "rev": "65712f5af67234dad91a5a4baee986a8b62dbf8f",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "treefmt-nix",
-        "type": "github"
-      }
     }
   },
   "root": "root",

flake.nix

@@ -26,7 +26,7 @@
       flake = false;
     };
 
-    nixd.url = "github:nix-community/nixd";
+    # nixd.url = "github:nix-community/nixd";
   };
 
   outputs = inputs @ {

nix/neovim-overlay.nix

@@ -152,7 +152,8 @@ with final.pkgs.lib; let
     bash-language-server
     emmet-language-server
     lua-language-server
-    inputs.nixd.packages.${pkgs.system}.nixd
+    nil
+    # inputs.nixd.packages.${pkgs.system}.nixd
     phpactor
     stylelint-lsp
     taplo

nvim/lsp/nil.lua

@@ -0,0 +1,14 @@
+return {
+  cmd = { 'nil' },
+  filetypes = { 'nix' },
+  root_markers = { 'flake.nix', '.git' },
+
+  settings = {
+    ['nil'] = {
+      flake = {
+        autoArchive = true,
+        autoEvalInputs = true,
+      },
+    },
+  },
+}

nvim/lua/lsp.lua

@@ -83,7 +83,8 @@ vim.lsp.enable({
   'bash-language-server',
   'emmet-language-server',
   'lua-language-server',
-  'nixd',
+  'nil',
+  -- 'nixd',
   'phpactor',
   'stylelint-lsp',
   'taplo',