Disable additional imports as it causes conflicts.

But this successfully will load all modules recursively.

flake.nix

@@ -28,8 +28,17 @@
 
   outputs = inputs@{ self, utils, nixpkgs, nixos-hardware, nur, home-manager
     , emacs-overlay, ... }:
-    let inherit (utils.lib) mkFlake exportModules;
+    let
+      inherit (utils.lib) mkFlake;
+      inherit (self.lib.my) mapModules mapModulesRec';
     in mkFlake {
+      lib = nixpkgs.lib.extend (self: super: {
+        my = import ./lib {
+          inherit inputs;
+          pkgs = nixpkgs;
+          lib = self;
+        };
+      });
 
       inherit self inputs;
       supportedSystems = [ "x86_64-linux" ];
@@ -48,7 +57,7 @@
 
       sharedOverlays = [ nur.overlay emacs-overlay.overlay ];
       hostDefaults = {
-        modules = [
+        modules = mapModulesRec' ./modules import ++ [
           home-manager.nixosModules.home-manager
           {
             home-manager.useGlobalPkgs = true;

lib/attrs.nix

@@ -0,0 +1,26 @@
+{ lib, ... }:
+
+with builtins;
+with lib;
+rec {
+  # attrsToList
+  attrsToList = attrs:
+    mapAttrsToList (name: value: { inherit name value; }) attrs;
+
+  # mapFilterAttrs ::
+  #   (name -> value -> bool)
+  #   (name -> value -> { name = any; value = any; })
+  #   attrs
+  mapFilterAttrs = pred: f: attrs: filterAttrs pred (mapAttrs' f attrs);
+
+  # Generate an attribute set by mapping a function over a list of values.
+  genAttrs' = values: f: listToAttrs (map f values);
+
+  # anyAttrs :: (name -> value -> bool) attrs
+  anyAttrs = pred: attrs:
+    any (attr: pred attr.name attr.value) (attrsToList attrs);
+
+  # countAttrs :: (name -> value -> bool) attrs
+  countAttrs = pred: attrs:
+    count (attr: pred attr.name attr.value) (attrsToList attrs);
+}

lib/default.nix

@@ -0,0 +1,19 @@
+{ inputs, lib, pkgs, ... }:
+
+let
+  inherit (lib) makeExtensible attrValues foldr;
+  inherit (modules) mapModules;
+
+  modules = import ./modules.nix {
+    inherit lib;
+    self.attrs = import ./attrs.nix {
+      inherit lib;
+      self = { };
+    };
+  };
+
+  mylib = makeExtensible (self:
+    with self;
+    mapModules ./. (file: import file { inherit self lib pkgs inputs; }));
+
+in mylib.extend (self: super: foldr (a: b: a // b) { } (attrValues super))

lib/modules.nix

@@ -0,0 +1,40 @@
+{ self, lib, ... }:
+
+let
+  inherit (builtins) attrValues readDir pathExists concatLists;
+  inherit (lib)
+    id mapAttrsToList filterAttrs hasPrefix hasSuffix nameValuePair
+    removeSuffix;
+  inherit (self.attrs) mapFilterAttrs;
+in rec {
+  mapModules = dir: fn:
+    mapFilterAttrs (n: v: v != null && !(hasPrefix "_" n)) (n: v:
+      let path = "${toString dir}/${n}";
+      in if v == "directory" && pathExists "${path}/default.nix" then
+        nameValuePair n (fn path)
+      else if v == "regular" && n != "default.nix" && hasSuffix ".nix" n then
+        nameValuePair (removeSuffix ".nix" n) (fn path)
+      else
+        nameValuePair "" null) (readDir dir);
+
+  mapModules' = dir: fn: attrValues (mapModules dir fn);
+
+  mapModulesRec = dir: fn:
+    mapFilterAttrs (n: v: v != null && !(hasPrefix "_" n)) (n: v:
+      let path = "${toString dir}/${n}";
+      in if v == "directory" then
+        nameValuePair n (mapModulesRec path fn)
+      else if v == "regular" && n != "default.nix" && hasSuffix ".nix" n then
+        nameValuePair (removeSuffix ".nix" n) (fn path)
+      else
+        nameValuePair "" null) (readDir dir);
+
+  mapModulesRec' = dir: fn:
+    let
+      dirs = mapAttrsToList (k: _: "${dir}/${k}")
+        (filterAttrs (n: v: v == "directory" && !(hasPrefix "_" n))
+          (readDir dir));
+      files = attrValues (mapModules dir id);
+      paths = files ++ concatLists (map (d: mapModulesRec' d id) dirs);
+    in map fn paths;
+}

lib/nixos.nix

@@ -0,0 +1,25 @@
+{ inputs, lib, pkgs, ... }:
+
+with lib;
+with lib.my;
+let sys = "x86_64-linux";
+in {
+  mkHost = path: attrs @ { system ? sys, ... }:
+    nixosSystem {
+      inherit system;
+      specialArgs = { inherit lib inputs system; };
+      modules = [
+        {
+          nixpkgs.pkgs = pkgs;
+          networking.hostName = mkDefault (removeSuffix ".nix" (baseNameOf path));
+        }
+        (filterAttrs (n: v: !elem n [ "system" ]) attrs)
+        ../.   # /default.nix
+        (import path)
+      ];
+    };
+
+  mapHosts = dir: attrs @ { system ? system, ... }:
+    mapModules dir
+      (hostPath: mkHost hostPath attrs);
+}

lib/options.nix

@@ -0,0 +1,16 @@
+{ lib, ... }:
+
+let inherit (lib) mkOption types;
+in rec {
+  mkOpt = type: default: mkOption { inherit type default; };
+
+  mkOpt' = type: default: description:
+    mkOption { inherit type default description; };
+
+  mkBoolOpt = default:
+    mkOption {
+      inherit default;
+      type = types.bool;
+      example = true;
+    };
+}

modules/applications/default.nix

@@ -1,20 +0,0 @@
-{ config, pkgs, ... }: {
-  imports = [
-    ./1password.nix
-    ./blueman.nix
-    ./dunst.nix
-    ./emacs.nix
-    ./gammastep.nix
-    ./gnome-common.nix
-    ./kdeconnect.nix
-    ./kitty.nix
-    ./media.nix
-    ./nextcloud.nix
-    ./spotify.nix
-    ./zathura.nix
-    ./zeal.nix
-
-    ./i3
-    ./firefox
-  ];
-}

modules/applications/firefox/default.nix

@@ -3,7 +3,6 @@ let
   cfg = config.this.application.firefox;
   graphical = config.this.graphical;
 in with lib; {
-  imports = [ ./tridactyl.nix ];
   options.this.application.firefox = {
     enable = mkOption {
       default = graphical.enable;

modules/applications/i3/default.nix

@@ -1,3 +0,0 @@
-{ config, pkgs, ... }: {
-  imports = [ ./i3.nix ./picom.nix ./polybar.nix ./rofi.nix ];
-}

modules/default.nix

@@ -1,11 +0,0 @@
-{ config, pkgs, lib, ... }:
-with lib;
-let
-in {
-
-  options.this.graphical = {
-    enable = mkEnableOption "Does this actually need X/Wayland";
-  };
-
-  imports = [ ./applications ./lang ./system ];
-}

modules/lang/default.nix

@@ -1,3 +0,0 @@
-{ config, pkgs, ... }: {
-  imports = [ ./golang.nix ./javascript.nix ./bash.nix ];
-}

modules/options.nix

@@ -0,0 +1,8 @@
+{ config, pkgs, lib, ... }: {
+
+  options.this.graphical = {
+    enable = lib.mkEnableOption "Does this actually need X/Wayland";
+  };
+
+  #  imports = [ ./applications ./lang ./system ];
+}

modules/system/default.nix

@@ -1,15 +0,0 @@
-{ config, pkgs, ... }: {
-  imports = [
-    ./boot.nix
-    ./cli.nix
-    ./displaymanager.nix
-    ./flatpak.nix
-    ./fonts.nix
-    ./gtk.nix
-    ./keyring.nix
-    ./power.nix
-    ./xdg.nix
-    ./yubikey.nix
-    ./zfs.nix
-  ];
-}

modules/system/displaymanager.nix

@@ -1,10 +1,10 @@
 { config, lib, pkgs, ... }:
 let
-  cfg = config.system.displaymanager;
+  cfg = config.this.system.displaymanager;
   graphical = config.this.graphical;
 in with lib; {
   options = {
-    system.displaymanager.enable = mkOption {
+    this.system.displaymanager.enable = mkOption {
       default = graphical.enable;
       type = with types; bool;
     };

profiles/minimal.nix

@@ -1,4 +1,4 @@
-{ config, pkgs, ... }:
+{ inputs, config, pkgs, ... }:
 
 let
   publicKey = pkgs.fetchurl {
@@ -8,8 +8,8 @@ let
 in {
 
   imports = [
-    ../modules/. # This imports /modules/default.nix
-    ../modules/system/xdg.nix
+    #../modules/. # This imports /modules/default.nix
+    #../modules/system/xdg.nix
   ];
   # Allow Cleanup, nix, & flakes
   nix = {