From d86e4c5be15dbbfa9f95337cb17f78279b121634 Mon Sep 17 00:00:00 2001
From: Aly Raffauf <aly@raffauflabs.com>
Date: Fri, 25 Oct 2024 15:05:48 -0400
Subject: [PATCH] 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        |  2 +-
 .../desktop/hyprland/settings.nix             |  5 +++
 homeManagerModules/options.nix                |  6 +++
 homeManagerModules/theme.nix                  |  2 +-
 nixosModules/desktop/default.nix              |  2 +
 nixosModules/desktop/greetd/default.nix       | 37 ++++++++++---------
 nixosModules/desktop/kde/default.nix          |  9 +++++
 nixosModules/options.nix                      |  1 +
 8 files changed, 45 insertions(+), 19 deletions(-)
 create mode 100644 nixosModules/desktop/kde/default.nix

diff --git a/homeManagerModules/desktop/default.nix b/homeManagerModules/desktop/default.nix
index af03c67a..491f739b 100644
--- a/homeManagerModules/desktop/default.nix
+++ b/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 "";
 
diff --git a/homeManagerModules/desktop/hyprland/settings.nix b/homeManagerModules/desktop/hyprland/settings.nix
index 32d0f020..aedc75e8 100644
--- a/homeManagerModules/desktop/hyprland/settings.nix
+++ b/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"
   ];
diff --git a/homeManagerModules/options.nix b/homeManagerModules/options.nix
index ed28406a..3dc8544e 100644
--- a/homeManagerModules/options.nix
+++ b/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.";
diff --git a/homeManagerModules/theme.nix b/homeManagerModules/theme.nix
index a3464a5d..863b3af1 100644
--- a/homeManagerModules/theme.nix
+++ b/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";
diff --git a/nixosModules/desktop/default.nix b/nixosModules/desktop/default.nix
index 464eca44..1332c5b2 100644
--- a/nixosModules/desktop/default.nix
+++ b/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
     ) {
diff --git a/nixosModules/desktop/greetd/default.nix b/nixosModules/desktop/greetd/default.nix
index 4d0a456c..5433e3f5 100644
--- a/nixosModules/desktop/greetd/default.nix
+++ b/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 =
-        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}";
-          };
-        };
+      settings.initial_session = lib.mkIf (config.ar.desktop.greetd.autologin != null) {
+        command = config.ar.desktop.greetd.session;
+        user = config.ar.desktop.greetd.autologin;
+      };
     };
   };
 }
diff --git a/nixosModules/desktop/kde/default.nix b/nixosModules/desktop/kde/default.nix
new file mode 100644
index 00000000..36afa5e4
--- /dev/null
+++ b/nixosModules/desktop/kde/default.nix
@@ -0,0 +1,9 @@
+{
+  config,
+  lib,
+  ...
+}: {
+  config = lib.mkIf config.ar.desktop.kde.enable {
+    services.desktopManager.plasma6.enable = true;
+  };
+}
diff --git a/nixosModules/options.nix b/nixosModules/options.nix
index 0959db3d..f91bb107 100644
--- a/nixosModules/options.nix
+++ b/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.";
     };