Add qt config

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

users/configs/qt/default.nix

@@ -0,0 +1,49 @@
+{ user ? throw "user argument is required" }: { config, lib, pkgs, ... }:
+
+let
+  hmConfig = config.home-manager.users.${user.name};
+in
+{
+  home-manager.users.${user.name} = {
+    qt = {
+      enable = true;
+      platformTheme.name = "qtct";
+      style.package = with pkgs; [
+        libsForQt5.qtstyleplugin-kvantum
+        qt6Packages.qtstyleplugin-kvantum
+      ];
+    };
+
+    home.sessionVariables = {
+      QT_QPA_PLATFORM = "wayland";
+      QT_QPA_PLATFORMTHEME = "qt5ct";
+    };
+
+    programs.matugen.settings.templates = {
+      # https://github.com/GabePoel/KvLibadwaita/blob/main/src/KvLibadwaita/KvLibadwaita.kvconfig
+      kvantumConfig = {
+        input_path = ./KvAdwQt/KvAdwQt.kvconfig;
+        output_path = "${hmConfig.xdg.configHome}/Kvantum/KvAdwQt/KvAdwQt.kvconfig";
+      };
+      # https://github.com/GabePoel/KvLibadwaita/blob/main/src/KvLibadwaita/KvLibadwaita.svg
+      kvantumSvg = {
+        input_path = ./KvAdwQt/KvAdwQt.svg;
+        output_path = "${hmConfig.xdg.configHome}/Kvantum/KvAdwQt/KvAdwQt.svg";
+      };
+    };
+
+    xdg.configFile =
+      let
+        qtConfig = (pkgs.formats.ini { }).generate "qt5ct.conf" {
+          Appearance.style = "kvantum";
+        };
+      in
+      {
+        "qt5ct/qt5ct.conf".source = qtConfig;
+        "qt6ct/qt6ct.conf".source = qtConfig;
+        "Kvantum/kvantum.kvconfig".source = (pkgs.formats.ini { }).generate "kvantum.kvconfig" {
+          General.theme = "KvAdwQt";
+        };
+      };
+  };
+}