formatter + nixConfig

flake.nix

@@ -1,4 +1,9 @@
 {
+  nixConfig = {
+    trusted-substituters = "https://cache.nixos.org/";
+    trusted-public-keys = "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=";
+    extra-experimental-features = "nix-command flakes";
+  };
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-22.11-small";
     flake-compat = {
@@ -7,21 +12,26 @@
     };
     flake-utils.url = "github:numtide/flake-utils";
   };
-  outputs = { nixpkgs, flake-utils, ... }:
-    flake-utils.lib.eachDefaultSystem (system:
-      let
-        pkgs = import nixpkgs { inherit system; };
-	devDeps = with pkgs; [ bash hugo zopfli brotli parallel ];
-      in
-      {
-        devShells.default = pkgs.mkShell {
-          name = "rules_nixpkgs_shell";
-          packages = devDeps;
-        };
+  outputs = {
+    nixpkgs,
+    flake-utils,
+    ...
+  }:
+    flake-utils.lib.eachDefaultSystem (system: let
+      pkgs = import nixpkgs {inherit system;};
+      devDeps = with pkgs; [bash hugo zopfli brotli parallel];
+    in {
+      devShells.default = pkgs.mkShell {
+        name = "rules_nixpkgs_shell";
+        packages = devDeps;
+      };
 
-	# TODO how to run scripts/build as a result of `nix run .`?
-	#packages = flake-utils.lib.mkApp {
-        #  name = "build
-	#};
-      });
+      # TODO how to run scripts/build as a result of `nix run .`?
+      #packages = flake-utils.lib.mkApp {
+      #  name = "build
+      #};
+
+      formatter = pkgs.alejandra;
+
+    });
 }

nixpkgs.nix

@@ -3,4 +3,4 @@ let
   spec = lock.nodes.nixpkgs.locked;
   nixpkgs = fetchTarball "https://github.com/${spec.owner}/${spec.repo}/archive/${spec.rev}.tar.gz";
 in
-import nixpkgs
+  import nixpkgs