improve: hakase-wallpaper-switch

apps/hyprpaper/home.nix

@@ -1,12 +1,35 @@
-{myConfig, ...}: {
+{
+  pkgs,
+  config,
+  lib,
+  myConfig,
+  ...
+}: let
+  wallpaperDir = "${config.home.homeDirectory}/.config/nixos/assets/Wallpapers";
+  defaultWallpaper = "${wallpaperDir}/${myConfig.hyprland.wallpaper}";
+  cacheWallpaper = "${config.home.homeDirectory}/.cache/current_wallpaper";
+in {
   services.hyprpaper = {
     enable = true;
     settings = {
-      # preload = ["../../assets/Wallpapers/${myConfig.hyprland.wallpaper}"];
-      # wallpaper = [
-      #   "HDMI-A-1,../../assets/Wallpapers/${myConfig.hyprland.wallpaper}"
-      # ];
+      preload = [cacheWallpaper];
+      wallpaper = [
+        ",${cacheWallpaper}"
+      ];
     };
   };
-  # systemd.user.startServices = "sd-switch";
+
+  home.activation.setupWallpaper = lib.hm.dag.entryAfter ["writeBoundary"] ''
+    if [ ! -f "${cacheWallpaper}" ]; then
+      mkdir -p "$(dirname "${cacheWallpaper}")"
+      if [ -f "${defaultWallpaper}" ]; then
+        cp "${defaultWallpaper}" "${cacheWallpaper}"
+      else
+        echo "Default wallpaper not found at ${defaultWallpaper}"
+        touch "${cacheWallpaper}"
+      fi
+    fi
+  '';
+
+  systemd.user.startServices = "sd-switch";
 }