Apply a KDE theme by default with a comprehensive example

common/default.nix

@@ -2,7 +2,7 @@
 #
 # SPDX-License-Identifier: MIT
 
-{ lib, ... }:
+{ pkgs, lib, ... }:
 {
   imports = [
     # Filesystem configuration
@@ -62,5 +62,12 @@
   securix.graphical-interface = {
     variant = "kde";
     terminalVariant = "kitty";
+
+    kde = {
+      lookAndFeelPackages = [
+        pkgs.securixThemes.example
+      ];
+      defaultLookAndFeel = "org.acmecorp.example";
+    };
   };
 }

default.nix

@@ -25,10 +25,16 @@ let
 
   defaultEdition = "acmecorp-bureautix";
 
+  pkgs' = pkgs.extend (
+    final: prev: {
+      securixThemes = final.callPackage ./themes { };
+    }
+  );
+
   securix = import securixSrc {
     edition = defaultEdition;
     defaultTags = [ defaultEdition ];
-    inherit pkgs;
+    pkgs = pkgs';
     # We override to use our own Disko which contains a patch for the office_v1 layout.
     sourcesOverrides =
       sources':

themes/default.nix

@@ -0,0 +1,57 @@
+# SPDX-FileCopyrightText: 2025 Ryan Lahfa <ryan.lahfa@numerique.gouv.fr>
+#
+# SPDX-License-Identifier: MIT
+
+{ mkPlasmaLookAndFeelPackage }:
+{
+  example = mkPlasmaLookAndFeelPackage {
+    name = "Example";
+    version = "0.01";
+
+    metadata = {
+      id = "org.acmecorp.example";
+      description = "Example - Example theme based on Breeze Light";
+
+      # Credits:
+      #
+      # Wallpaper comes from https://unsplash.com/fr/@bernardhermant
+      # https://unsplash.com/fr/photos/un-mur-blanc-avec-une-horloge-sur-le-cote-0D5KCGpz-_4
+      # Icon comes from freepik.com
+
+      authors = {
+        rlahfa = {
+          name = "Ryan Lahfa";
+          email = "ryan.lahfa.ext@numerique.gouv.fr";
+        };
+      };
+
+      # https://spdx.org/licenses/etalab-2.0.html
+      license = "etalab-2.0";
+    };
+
+    defaults = {
+      kdeglobals = {
+        KDE.widgetStyle = "Breeze";
+        General.ColorScheme = "BreezeLight";
+        Icons.Theme = "breeze";
+      };
+      # Default wallpaper.
+      Wallpaper.Image = "GeometricWhite";
+      plasmarc.Theme = "default";
+      kcminputrc.Mouse.cursorTheme = "breeze_cursors";
+      kwinrc = {
+        "org.kde.kdecoration2" = {
+          library = "org.kde.breeze";
+          theme = "Breeze";
+        };
+      };
+      KSplash.Theme = "org.kde.Breeze";
+    };
+
+    icons = ./example-org/icons;
+    wallpapers = ./example-org/wallpapers;
+    launcherIcon = "example-launch";
+    previews = ./example-org/previews;
+    splash = null;
+  };
+}

themes/example-org/icons/hicolor/128x128/emblems/example-launcher.png.license

@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2025 Freepik
+
+SPDX-License-Identifier: FreepikLicense

themes/example-org/wallpapers/GeometricWhite/contents/images/1920x1080.png.license

@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2025 Bernard Hermant
+
+SPDX-License-Identifier: UnsplashFreeLicense

themes/example-org/wallpapers/GeometricWhite/metadata.json

@@ -0,0 +1,9 @@
+{
+  "KPlugin": {
+    "Authors": [ { "Email": "", "Name": "Bernard Hermant" } ],
+    "Website": "...",
+    "Id": "GeometricWhite",
+    "License": "",
+    "Name": "Geometric White"
+  }
+}

themes/example-org/wallpapers/GeometricWhite/metadata.json.license

@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2025 Ryan Lahfa <ryan.lahfa@numerique.gouv.fr>
+
+SPDX-License-Identifier: MIT