languages/nix: add nixd to supported LSP servers

Add nixd to flake.nix and legacyPackages.nix.

Format with alejandra.

Update flake.nix

Undo change made by nixfmt-rfc-style

Set nixd to follow flake-utils as well.

Update nixd lspConfig

flake.lock

@@ -18,6 +18,39 @@
         "type": "github"
       }
     },
+    "flake-parts_2": {
+      "inputs": {
+        "nixpkgs-lib": "nixpkgs-lib_2"
+      },
+      "locked": {
+        "lastModified": 1714606777,
+        "narHash": "sha256-bMkNmAXLj8iyTvxaaD/StcLSadbj1chPcJOjtuVnLmA=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "4d34ce6412bc450b1d4208c953dc97c7fc764f1a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
+    "flake-root": {
+      "locked": {
+        "lastModified": 1713493429,
+        "narHash": "sha256-ztz8JQkI08tjKnsTpfLqzWoKFQF4JGu2LRz8bkdnYUk=",
+        "owner": "srid",
+        "repo": "flake-root",
+        "rev": "bc748b93b86ee76e2032eecda33440ceb2532fcd",
+        "type": "github"
+      },
+      "original": {
+        "owner": "srid",
+        "repo": "flake-root",
+        "type": "github"
+      }
+    },
     "flake-utils": {
       "inputs": {
         "systems": "systems"
@@ -96,6 +129,29 @@
         "type": "github"
       }
     },
+    "nixd": {
+      "inputs": {
+        "flake-parts": "flake-parts_2",
+        "flake-root": "flake-root",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "treefmt-nix": "treefmt-nix"
+      },
+      "locked": {
+        "lastModified": 1731087557,
+        "narHash": "sha256-W70xy7WFqA5940zhodAsGiC/nvqGwZ07YE34ObMK/po=",
+        "owner": "nix-community",
+        "repo": "nixd",
+        "rev": "1cf9ec0a82bcac57c7c12b6378bd8c28513cd3a6",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "nixd",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1726871744,
@@ -124,6 +180,24 @@
         "url": "https://github.com/NixOS/nixpkgs/archive/50eb7ecf4cd0a5756d7275c8ba36790e5bd53e33.tar.gz"
       }
     },
+    "nixpkgs-lib_2": {
+      "locked": {
+        "dir": "lib",
+        "lastModified": 1714253743,
+        "narHash": "sha256-mdTQw2XlariysyScCv2tTE45QSU9v/ezLcHJ22f0Nxc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "58a1abdbae3217ca6b702f03d3b35125d88a2994",
+        "type": "github"
+      },
+      "original": {
+        "dir": "lib",
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "nixpkgs_2": {
       "locked": {
         "lastModified": 1656753965,
@@ -1815,6 +1889,7 @@
         "flake-utils": "flake-utils",
         "mnw": "mnw",
         "nil": "nil",
+        "nixd": "nixd",
         "nixpkgs": "nixpkgs",
         "nmd": "nmd",
         "plugin-alpha-nvim": "plugin-alpha-nvim",
@@ -1978,6 +2053,27 @@
         "type": "github"
       }
     },
+    "treefmt-nix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixd",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1722330636,
+        "narHash": "sha256-uru7JzOa33YlSRwf9sfXpJG+UAV+bnBEYMjrzKrQZFw=",
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "rev": "768acdb06968e53aa1ee8de207fd955335c754b7",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "type": "github"
+      }
+    },
     "utils": {
       "locked": {
         "lastModified": 1656928814,

flake.nix

@@ -11,8 +11,11 @@
   in
     flake-parts.lib.mkFlake {
       inherit inputs;
-      specialArgs = {inherit lib;};
+      specialArgs = {
-    } {
+        inherit lib;
+      };
+    }
+    {
       # Allow users to bring their own systems.
       # «https://github.com/nix-systems/nix-systems»
       systems = import inputs.systems;
@@ -66,7 +69,12 @@
           default = self'.devShells.lsp;
           nvim-nix = pkgs.mkShell {packages = [config.packages.nix];};
           lsp = pkgs.mkShell {
-            packages = with pkgs; [nil statix deadnix alejandra];
+            packages = with pkgs; [
+              nil
+              statix
+              deadnix
+              alejandra
+            ];
           };
         };
 
@@ -111,6 +119,11 @@
       inputs.nixpkgs.follows = "nixpkgs";
       inputs.flake-utils.follows = "flake-utils";
     };
+    nixd = {
+      url = "github:nix-community/nixd";
+      inputs.nixpkgs.follows = "nixpkgs";
+      inputs.flake-utils.follows = "flake-utils";
+    };
 
     ## Plugins
     # LSP plugins

flake/legacyPackages.nix

@@ -11,6 +11,7 @@
         (_: _: {
           rnix-lsp = inputs'.rnix-lsp.defaultPackage;
           nil = inputs'.nil.packages.default;
+          nixd = inputs'.nixd.packages.default;
         })
       ];
     };

modules/plugins/languages/nix.nix

@@ -74,6 +74,23 @@
         }
       '';
     };
+
+    nixd = {
+      package = pkgs.nixd;
+      internalFormatter = cfg.format.type == "nixpkgs-fmt";
+      lspConfig = ''
+        lspconfig.nixd.setup{
+          capabilities = capabilities,
+          on_attach = default_on_attach,
+        ${
+          if (cfg.format.enable && cfg.format.type == "nixpkgs-fmt")
+          then useFormat
+          else noFormat
+        },
+          cmd = ${packageToCmd cfg.lsp.package "nixd"},
+        }
+      '';
+    };
   };
 
   defaultFormat = "alejandra";