refactor: modularize theming

hosts/callisto/configuration.nix

@@ -22,6 +22,10 @@
         firewallPresets.vite = true;
         cloudflareNameservers.enable = true;
       };
+      fonts.enable = true;
+    };
+    theming = {
+      enable = true;
     };
   };
 

hosts/callisto/default.nix

@@ -11,7 +11,6 @@
       ../../modules/linux/networking
       ../../modules/linux/fonts
       ../../modules/linux/greeter
-      # ../../modules/linux/spotifyd
       ../../modules/linux/core
       ../../modules/linux/desktop-portal
       ../../modules/linux/stylix

modules/linux/fonts/default.nix

@@ -1,19 +1,31 @@
-{ pkgs, ... }:
 {
+  pkgs,
+  lib,
+  config,
+  ...
+}:
+let
+  cfg = config.liminalOS.system.fonts;
+in
+{
+  options.liminalOS.system.fonts = {
+    enable = lib.mkEnableOption "fonts";
+  };
+
+  config = lib.mkIf cfg.enable {
     fonts = {
       enableDefaultPackages = true;
-    # fontconfig = {
-    #   defaultFonts = {
-    #     serif = [ "Noto Serif" ];
-    #     sansSerif = [ "Noto Sans" ];
-    #   };
-    # };
-    packages = with pkgs; [
-      # noto-fonts
+      packages =
+        with pkgs;
+        [
           noto-fonts-cjk-sans
-      # noto-fonts-emoji
-      # (nerdfonts.override { fonts = [ "CascadiaCode" ]; })
           (google-fonts.override { fonts = [ "Lora" ]; })
-    ];
+        ]
+        ++ (lib.optionals (!config.liminalOS.theming.enable) [
+          noto-fonts
+          noto-fonts-emoji
+          nerd-fonts.caskaydia-cove
+        ]);
+    };
   };
 }

modules/linux/stylix/default.nix

@@ -1,9 +1,30 @@
-{ inputs, pkgs, ... }:
 {
+  inputs,
+  pkgs,
+  config,
+  lib,
+  ...
+}:
+let
+  cfg = config.liminalOS.theming;
+in
+{
+  options.liminalOS.theming = {
+    enable = lib.mkEnableOption "theming";
+    stylixName = lib.mkOption {
+      type = lib.types.str;
+      default = "stylix";
+      description = ''
+        Name of Stylix module defined in `inputs`. Defaults to `stylix`. You must define `inputs.stylix.url` in your `flake.nix` to enable this option
+      '';
+    };
+  };
+
   imports = [
     inputs.stylix.nixosModules.stylix
   ];
 
+  config = lib.mkIf cfg.enable {
     stylix = {
       enable = true;
       image = "${inputs.wallpapers}/aesthetic/afterglow_city_skyline_at_night.png";
@@ -37,4 +58,11 @@
         size = 26;
       };
     };
+    assertions = [
+      {
+        assertion = builtins.hasAttr cfg.stylixName inputs;
+        message = ''You enabled theming but did not add a Stylix module to your flake inputs, or did not set `liminalOS.theming.stylixName` to the name of your Stylix input, if it is not `stylix`. Please set `inputs.stylix.url = "github:danth/stylix"` or set the stylixName option to the name of your stylix flake input.'';
+      }
+    ];
+  };
 }

modules/linux/wsl/default.nix

@@ -8,17 +8,17 @@ let
   cfg = config.liminalOS.wsl;
 in
 {
-  imports = lib.mkIf cfg.enable [
-    inputs.nixos-wsl.nixosModules.default
+  imports = [
+    inputs.${cfg.wslName}.nixosModules.default
   ];
 
   options = {
-    enable = lib.mkEnableOption "wsl";
-    module = lib.mkOption {
-      type = lib.types.submodule;
-      default = inputs.nixos-wsl.nixosModules.default;
+    enable = lib.mkEnableOption "WSL";
+    wslName = lib.mkOption {
+      type = lib.types.str;
+      default = "nixos-wsl";
       description = ''
-        NixOS WSL module. Defaults to <https://github.com/nix-community/NixOS-WSL>
+        Name of the NixOS WSL module in your flake inputs. You should define `inputs.nixos-wsl.url = "github:nixos-community/nixos-wsl", and set `liminalOS.wsl.wslName` if you did not call it `nixos-wsl`.
       '';
     };
   };
@@ -28,4 +28,10 @@ in
     defaultUser = config.liminalOS.username;
     useWindowsDriver = true;
   };
+  assertions = [
+    {
+      assertion = builtins.hasAttr cfg.wslName inputs;
+      message = ''You enabled WSL but did not add the WSL module to your flake inputs, or did not set `liminalOS.theming.wslName` to the name of your NixOS WSL input, if it is not `nixos-wsl`. Please set `inputs.nixos-wsl.url = "github:nix-community/nixos-wsl"` or set the wslName option to the name of your WSL flake input.'';
+    }
+  ];
 }