default.nix: support for traditional channels

Though, it's limited compared to flakes. I supposed that's better than
nothing.

README.adoc

@@ -113,6 +113,7 @@ nixos-config
 ├── shells/
 ├── templates/
 ├── users/
+├── default.nix
 ├── flake.lock
 ├── flake.nix
 └── README.adoc

default.nix

@@ -0,0 +1,11 @@
+{ pkgs ? import <nixpkgs> { } }:
+
+let
+  lib' = pkgs.lib.extend (final: prev:
+    import ./lib { lib = prev; } // import ./lib/private.nix { lib = final; });
+in {
+  lib = import ./lib { lib = pkgs.lib; };
+  modules = lib'.importModules (lib'.filesToAttr ./modules/nixos);
+  overlays.foo-dogsquared-pkgs = final: prev: import ./pkgs { pkgs = prev; };
+  hmModules = lib'.importModules (lib'.filesToAttr ./modules/home-manager);
+} // (import ./pkgs { inherit pkgs; })

flake.nix

@@ -232,16 +232,6 @@
         };
       };
 
-      # A list of module namespaces that will not be imported into the output.
-      # It could be blocked for whatever reason or as indicated.
-      blocklist = [
-        # The modules under this attribute are often incomplete and needing
-        # very specific requirements that is 99% going to be absent from the
-        # outside so we're not going to export it.
-        "tasks"
-      ];
-      importModules = attrs:
-        lib'.filterAttrs (n: v: !lib'.elem n blocklist) (lib'.mapAttrsRecursive (_: path: import path) attrs);
     in {
       # Exposes only my library with the custom functions to make it easier to
       # include in other flakes for whatever reason may be.
@@ -260,7 +250,7 @@
 
       # We're going to make our custom modules available for our flake. Whether
       # or not this is a good thing is debatable, I just want to test it.
-      nixosModules = importModules (lib'.filesToAttr ./modules/nixos);
+      nixosModules = lib'.importModules (lib'.filesToAttr ./modules/nixos);
 
       # I can now install home-manager users in non-NixOS systems.
       # NICE!
@@ -278,7 +268,7 @@
         (lib'.filesToAttr ./users/home-manager);
 
       # Extending home-manager with my custom modules, if anyone cares.
-      homeManagerModules = importModules (lib'.filesToAttr ./modules/home-manager);
+      homeManagerModules = lib'.importModules (lib'.filesToAttr ./modules/home-manager);
 
       # My custom packages, available in here as well. Though, I mainly support
       # "x86_64-linux". I just want to try out supporting other systems.

lib/private.nix

@@ -35,4 +35,15 @@ rec {
 
   getUser = type: user:
     lib.getAttr user (getUsers type [ user ]);
+
+  # Import modules with a set blocklist.
+  importModules = let
+    blocklist = [
+      # The modules under this attribute are often incomplete and needing
+      # very specific requirements that is 99% going to be absent from the
+      # outside so we're not going to export it.
+      "tasks"
+    ];
+  in attrs:
+  lib.filterAttrs (n: v: !lib.elem n blocklist) (lib.mapAttrsRecursive (_: path: import path) attrs);
 }