dev: Add nixpkgs-fmt to pre-commit

ci.nix

@@ -4,7 +4,8 @@
 let
   flake = import ./dev;
   inherit (flake.inputs.nixpkgs) lib;
-in {
+in
+{
   inherit (flake) herculesCI;
 } // {
   checks = lib.recurseIntoAttrs flake.checks.${builtins.currentSystem};

dev/default.nix

@@ -9,4 +9,4 @@ let
     { inherit self; }
     ./flake-module.nix;
 in
-  self.config.flake // { inherit (flake) inputs; }
+self.config.flake // { inherit (flake) inputs; }

dev/flake-module.nix

@@ -20,6 +20,7 @@ flakeModuleArgs@{ config, lib, inputs, ... }:
     pre-commit = {
       inherit pkgs; # should make this default to the one it can get via follows
       settings = {
+        hooks.nixpkgs-fmt.enable = true;
       };
     };
 
@@ -43,7 +44,7 @@ flakeModuleArgs@{ config, lib, inputs, ... }:
   flake = {
     options.herculesCI = lib.mkOption { type = lib.types.raw; };
     config.herculesCI = {
-      onPush.default.outputs = { 
+      onPush.default.outputs = {
         inherit (config.flake) packages checks;
       };
     };

lib.nix

@@ -24,10 +24,10 @@ let
       options:
       mkOption {
         type = types.submoduleWith {
-          modules = [ { inherit options; } ];
+          modules = [{ inherit options; }];
         };
       };
-    
+
     mkPerSystemType =
       module:
       types.functionTo (types.submoduleWith {

template/multi-module/hello/flake-module.nix

@@ -1,4 +1,3 @@
-
 # Definitions can be imported from a separate file like this one
 
 { self, ... }: {
@@ -15,4 +14,4 @@
       ];
     };
   };
-}
+}