desktop: add kde modules (#143)

* theme: don't set kde qt theme if kde is enabled

* home: add kde option

* nixos: add kde module

* hyprland: set kde theme variables

* desktop: set libadwaita headerbar buttons for kde

* greetd: tuigreet -> regreet

homeManagerModules/desktop/default.nix

@@ -21,7 +21,7 @@
         enable = true;
         settings = {
           "org/gnome/desktop/wm/preferences".button-layout =
-            if config.ar.home.desktop.gnome.enable
+            if (config.ar.home.desktop.gnome.enable || config.ar.home.desktop.kde.enable)
             then "appmenu:minimize,maximize,close"
             else "";
 

homeManagerModules/desktop/hyprland/settings.nix

@@ -129,6 +129,11 @@ in {
 
   dwindle.preserve_split = true;
 
+  env = [
+    "QT_QPA_PLATFORMTHEME,kde"
+    "QT_STYLE_OVERRIDE,Breeze"
+  ];
+
   exec-once = [
     "${pkgs.polkit_gnome}/libexec/polkit-gnome-authentication-agent-1"
   ];

homeManagerModules/options.nix

@@ -136,6 +136,12 @@ in {
         };
       };
 
+      kde.enable = lib.mkOption {
+        description = "KDE Plasma with sane defaults.";
+        default = osConfig.ar.desktop.kde.enable;
+        type = lib.types.bool;
+      };
+
       sway = {
         enable = lib.mkOption {
           description = "Sway with full desktop session components.";

homeManagerModules/theme.nix

@@ -21,7 +21,7 @@ in {
       package = pkgs.papirus-icon-theme.override {color = "adwaita";};
     };
 
-    qt = {
+    qt = lib.mkIf (!config.ar.home.desktop.kde.enable) {
       enable = true;
       platformTheme.name = "kde";
       style.name = "Breeze";

nixosModules/desktop/default.nix

@@ -8,6 +8,7 @@
     ./greetd
     ./gnome
     ./hyprland
+    ./kde
     ./sway
     ./waylandComp.nix
   ];
@@ -16,6 +17,7 @@
     lib.mkIf (
       config.ar.desktop.gnome.enable
       || config.ar.desktop.hyprland.enable
+      || config.ar.desktop.kde.enable
       || config.ar.desktop.steam.enable
       || config.ar.desktop.sway.enable
     ) {

nixosModules/desktop/greetd/default.nix

@@ -1,7 +1,6 @@
 {
   config,
   lib,
-  pkgs,
   ...
 }: {
   config = lib.mkIf config.ar.desktop.greetd.enable {
@@ -11,25 +10,29 @@
       kwallet.enable = true;
     };
 
+    programs.regreet = {
+      enable = true;
+
+      settings = {
+        background.fit =
+          if config.stylix.imageScalingMode == "fill"
+          then "Fill"
+          else "ScaleDown";
+
+        GTK.application_prefer_dark_theme =
+          if config.stylix.polarity == "dark"
+          then true
+          else false;
+      };
+    };
+
     services.greetd = {
       enable = true;
 
-      settings =
+      settings.initial_session = lib.mkIf (config.ar.desktop.greetd.autologin != null) {
-        if config.ar.desktop.greetd.autologin != null
-        then {
-          default_session = {
-            command = lib.mkDefault "${lib.getExe pkgs.greetd.tuigreet} --asterisks --user-menu -g 'Welcome to NixOS ${config.system.nixos.release}' --time --remember --cmd ${config.ar.desktop.greetd.session}";
-          };
-          initial_session = {
         command = config.ar.desktop.greetd.session;
         user = config.ar.desktop.greetd.autologin;
       };
-        }
-        else {
-          default_session = {
-            command = lib.mkDefault "${lib.getExe pkgs.greetd.tuigreet} --asterisks --user-menu -g 'Welcome to NixOS ${config.system.nixos.release}' --time --remember --cmd ${config.ar.desktop.greetd.session}";
-          };
-        };
     };
   };
 }

nixosModules/desktop/kde/default.nix

@@ -0,0 +1,9 @@
+{
+  config,
+  lib,
+  ...
+}: {
+  config = lib.mkIf config.ar.desktop.kde.enable {
+    services.desktopManager.plasma6.enable = true;
+  };
+}

nixosModules/options.nix

@@ -31,6 +31,7 @@
 
       gnome.enable = lib.mkEnableOption "GNOME desktop session.";
       hyprland.enable = lib.mkEnableOption "Hyprland wayland session.";
+      kde.enable = lib.mkEnableOption "KDE desktop session.";
       steam.enable = lib.mkEnableOption "Steam + Gamescope session.";
       sway.enable = lib.mkEnableOption "Sway wayland session.";
     };