feat(home-manager): add support for kvantum

modules/home-manager/kvantum.nix

@@ -0,0 +1,43 @@
+{ config
+, lib
+, pkgs
+, ...
+}:
+let
+  cfg = config.qt.catppuccin-kvantum;
+  enable = cfg.enable && config.qt.enable;
+  flavourCapitalized = lib.ctp.mkUpper cfg.flavour;
+  accentCapitalized = lib.ctp.mkUpper cfg.accent;
+  theme = pkgs.catppuccin-kvantum.override {
+    accent = accentCapitalized;
+    variant = flavourCapitalized;
+  };
+in
+{
+  options.qt.catppuccin-kvantum = lib.ctp.mkCatppuccinOpt "Kvantum" // {
+    accent = lib.ctp.mkAccentOpt "Kvantum";
+
+    apply = lib.mkOption {
+      type = lib.types.bool;
+      default = true;
+      description = ''
+        Applies the theme by overwriting `$XDG_CONFIG_HOME/Kvantum/kvantum.kvconfig`.
+        If this is disabled, you must manually set the theme (e.g. by using `kvantummanager`).
+      '';
+    };
+  };
+
+  config = lib.mkIf enable {
+    qt.style.name = "kvantum";
+
+    xdg.configFile = {
+      "Kvantum/Catppuccin-${flavourCapitalized}-${accentCapitalized}".source = "${theme}/share/Kvantum/Catppuccin-${flavourCapitalized}-${accentCapitalized}";
+      "Kvantum/kvantum.kvconfig" = lib.mkIf cfg.apply {
+        text = ''
+          [General]
+          theme=Catppuccin-${flavourCapitalized}-${accentCapitalized}
+        '';
+      };
+    };
+  };
+}

test.nix

@@ -115,6 +115,8 @@ testers.runNixOSTest {
 
       gtk = lib.recursiveUpdate enable { catppuccin.cursor.enable = true; };
 
+      qt = enable;
+
       services = {
         dunst = enable;
         mako = enable;