#+begin_src nix :tangle home/desktop/wallpaper.nix :noweb tangle :mkdirp yes
{ config, pkgs, lib, flakeRoot, ... }:
let
  repoWallpaperDir  = flakeRoot + "/assets/conf/desktop/wallpaper";
  repoWallpaperConf = flakeRoot + "/assets/conf/desktop/wallpaper/wallpaper.conf";
  userRelRoot  = "nixos_conf/wallpaperstuff";
  userAbsRoot  = "${config.home.homeDirectory}/${userRelRoot}";
  userConfPath = "${userAbsRoot}/wallpaper.conf";
  # Exclude wallpaper.conf so HM does NOT manage it (avoids backup collisions)
  repoWallpapersOnly = lib.cleanSourceWith {
  src = repoWallpaperDir;
  filter = path: type:
  (builtins.baseNameOf path) != "wallpaper.conf";
  };
in
{
  home.packages = [ pkgs.wpaperd ];
  # Sync everything *except* wallpaper.conf into ~/nixos_conf/wallpaperstuff
  home.file."${userRelRoot}" = {
  source = repoWallpapersOnly;
  recursive = true;
  };
  # Now safely overwrite the config every activation (no HM collision)
  home.activation.wallpaperConfForce =
  lib.hm.dag.entryAfter [ "writeBoundary" ] ''
  set -euo pipefail
  mkdir -p "${userAbsRoot}"
  install -m 0644 "${repoWallpaperConf}" "${userConfPath}"
  '';
  systemd.user.services.wpaperd = {
  Unit = {
  Description = "wpaperd wallpaper daemon";
  After = [ "default.target" ];
  };
  Service = {
  Type = "simple";
  ExecStart = "${pkgs.wpaperd}/bin/wpaperd --config ${userConfPath}";
  Restart = "on-failure";
  RestartSec = 1;
  };
  Install.WantedBy = [ "default.target" ];
  ;