inputs: lazy-trees at home

flake.nix

@@ -1,5 +1,34 @@
 {
-  outputs = inputs: (import ./nilla.nix { inherit inputs; }).flake;
+  outputs =
+    inputs:
+    let
+      nilla = import ./nilla.nix { inherit inputs; };
+      systems = [
+        "x86_64-linux"
+        "aarch64-linux"
+        "aarch64-darwin"
+      ];
+      # NOTE: Assumes every package is available for every system.
+      #       For now let's say this is always the case.
+      transpose =
+        attrs:
+        let
+          inherit (inputs.nixpkgs) lib;
+          mappedForSystem = system: builtins.mapAttrs (_: pkg: pkg.result.${system}) attrs;
+        in
+        lib.genAttrs systems mappedForSystem;
+    in
+    {
+      inherit (nilla) nixosModules;
+      inherit (nilla) darwinModules;
+      inherit (nilla) homeModules;
+      inherit (nilla) nixosConfigurations;
+      inherit (nilla) darwinConfigurations;
+      inherit (nilla) homeConfigurations;
+      devShells = transpose nilla.shells;
+      packages = transpose nilla.packages;
+      formatter = nilla.packages.formatter.result;
+    };
 
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs?ref=nixpkgs-unstable";
@@ -99,4 +128,26 @@
       flake = false;
     };
   };
+
+  /*
+    TODO: Uncomment once (if ever?) nixConfig makes sense in flakes
+    nixConfig = {
+      extra-substituters = [
+        "https://hyprland.cachix.org"
+        "https://cache.garnix.io"
+        "https://nix-community.cachix.org"
+        "https://hercules-ci.cachix.org"
+        "https://nrabulinski.cachix.org"
+        "https://cache.nrab.lol"
+      ];
+      extra-trusted-public-keys = [
+        "hyprland.cachix.org-1:a7pgxzMz7+chwVL3/pzj6jIBMioiJM7ypFP8PwtkuGc="
+        "cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g="
+        "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
+        "hercules-ci.cachix.org-1:ZZeDl9Va+xe9j+KqdzoBZMFJHVQ42Uu/c/1/KMC5Lw0="
+        "nrabulinski.cachix.org-1:Q5FD7+1c68uH74CQK66UWNzxhanZW8xcg1LFXxGK8ic="
+        "cache.nrab.lol-1:CJl1TouOyuJ1Xh4tZSXLwm3Upt06HzUNZmeyuEB9EZg="
+      ];
+    };
+  */
 }

hosts/default.nix

@@ -26,14 +26,28 @@ in
           settei = inputs.self;
         };
       };
+
+      baseNixos = inputs.nixpkgs.lib.nixosSystem {
+        modules = [
+          config.nixosModules.combined
+          sharedOptions
+        ];
+        specialArgs.configurationName = "base";
+      };
+
+      baseDarwin = inputs.darwin.lib.darwinSystem {
+        modules = [
+          config.darwinModules.combined
+          sharedOptions
+        ];
+        specialArgs.configurationName = "base";
+      };
     in
     {
       nixos =
         name: module:
-        inputs.nixpkgs.lib.nixosSystem {
+        baseNixos.extendModules {
           modules = [
-            config.nixosModules.combined
-            sharedOptions
             module
             config.extraHostConfigs.${name} or { }
           ];
@@ -42,14 +56,18 @@ in
 
       darwin =
         name: module:
-        inputs.darwin.lib.darwinSystem {
-          modules = [
-            config.darwinModules.combined
-            sharedOptions
-            module
-            config.extraHostConfigs.${name} or { }
-          ];
-          specialArgs.configurationName = name;
+        let
+          eval = baseDarwin._module.args.extendModules {
+            modules = [
+              module
+              config.extraHostConfigs.${name} or { }
+            ];
+            specialArgs.configurationName = name;
+          };
+        in
+        eval
+        // {
+          system = eval.config.system.build.toplevel;
         };
     };
 }

inputs.nix

@@ -11,5 +11,4 @@ let
     useBuiltinsFetchTree = true;
   };
 in
-# Workaround for https://github.com/nilla-nix/nilla/issues/14
-builtins.mapAttrs (_: input: input // { type = "derivation"; }) flake.inputs
+flake.inputs

modules/nilla/default.nix

@@ -4,6 +4,5 @@
     ./services.nix
     ./configurations.nix
     ./modules.nix
-    ./flake.nix
   ];
 }

modules/nilla/flake.nix

@@ -1,31 +0,0 @@
-{ lib, config }:
-let
-  systems = [
-    "x86_64-linux"
-    "aarch64-linux"
-    "aarch64-darwin"
-  ];
-  transpose =
-    attrs: lib.attrs.generate systems (system: builtins.mapAttrs (_: pkg: pkg.result.${system}) attrs);
-in
-{
-  options.flake = lib.options.create {
-    type = lib.types.attrs.of lib.types.raw;
-  };
-
-  config.flake = {
-    inherit (config)
-      nixosModules
-      darwinModules
-      homeModules
-      nixosConfigurations
-      darwinConfigurations
-      homeConfigurations
-      ;
-
-    devShells = transpose config.shells;
-    packages = transpose config.packages;
-
-    formatter = config.packages.formatter.result;
-  };
-}