plasma: Add sddm-sugar-dark as a theme

modules/desktop/plasma.nix

@@ -14,6 +14,20 @@ in {
         description = "Ignore NixOS 'recommendations' and use the Wayland session by default";
       };
     };
+    sddm = {
+      backgroundImage = lib.mkOption {
+        default = "${pkgs.sddm-sugar-dark}/usr/share/sddm/themes/sugar-dark/Background.jpg";
+        description = "The background image to use with sddm-sugar-dark";
+      };
+      screenWidth = lib.mkOption {
+        default = 1920;
+        description = "Width of the screen";
+      };
+      screenHeight = lib.mkOption {
+        default = 1080;
+        description = "Width of the screen";
+      };
+    };
   };
 
   config = lib.mkIf cfg.enable {
@@ -22,9 +36,40 @@ in {
       greetd.enableKwallet = true;
     };
     services.xserver = {
-      displayManager.sddm = {
+      displayManager.sddm = let
+        sddm-sugar-dark-configured = pkgs.sddm-sugar-dark.override {
+          config = {
+            General = {
+              Background = "${cfg.sddm.backgroundImage}";
+              ScaleImageCropped = true;
+              ScreenWidth = builtins.toString cfg.sddm.screenWidth;
+              ScreenHeight = builtins.toString cfg.sddm.screenHeight;
+
+              MainColor = "navajowhite";
+              AccentColor = "white";
+              RoundCorners = 20;
+              ScreenPadding = 0;
+              Font = "Noto Sans";
+              FontSize = "";
+
+              Locale = "";
+              HourFormat = "HH:mm";
+              DataFormat = "dddd, d of MMMM";
+
+              ForceLastUser = true;
+              ForcePasswordFocus = true;
+              ForceHideCompletePassword = true;
+              ForceHideVirtualKeyboardButton = false;
+
+              HeaderText = "Welcome!";
+            };
+          };
+        };
+      in {
         enable = true;
         autoNumlock = true;
+
+        theme = "${sddm-sugar-dark-configured}/usr/share/sddm/themes/sugar-dark";
       };
       desktopManager.plasma5 = {
         enable = true;
@@ -51,7 +96,7 @@ in {
           };
         };
 
-        kwinrc = {
+        kwinrc = lib.mkIf cfg.mobile.enable {
           Plugins = {
             "org.kde.phone.multitaskingEnabled" = "false";
             "kwin4_effect_eyeonscreenEnabled" = "false";