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path: root/lass/2configs/themes.nix
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{ config, lib, pkgs, ... }: let

    switch-theme = pkgs.writers.writeDashBin "switch-theme" ''
      if test -e "/etc/themes/$1"; then
        ${pkgs.rsync}/bin/rsync --chown=lass:users -a --delete "/etc/themes/$1/" /var/theme/config/
        echo "$1" > /var/theme/current_theme
        chown lass:users /var/theme/current_theme
        ${pkgs.procps}/bin/pkill -HUP xsettingsd

      else
        echo "theme $1 not found"
      fi
    '';

in {
  systemd.services.xsettingsd = {
    wantedBy = [ "multi-user.target" ];
    environment.DISPLAY = ":0";
    serviceConfig = {
      ExecStart = "${pkgs.xsettingsd}/bin/xsettingsd -c /var/theme/config/xsettings.conf";
      User = "lass";
    };
  };
  systemd.tmpfiles.rules = [
    "d /var/theme/ 755 lass users"
  ];
  environment.systemPackages = [
    switch-theme
  ];
  environment.etc = {
    "themes/light/xsettings.conf".text = ''
      Net/ThemeName "Adwaita" 
    '';
    "themes/dark/xsettings.conf".text = ''
      Net/ThemeName "Adwaita-dark" 
    '';
  };
  system.activationScripts.theme.text = ''
    if test -e /var/theme/current_theme; then
      ${switch-theme}/bin/switch-theme "$(cat /var/theme/current_theme)" ||
      ${switch-theme}/bin/switch-theme dark
    else
      ${switch-theme}/bin/switch-theme dark
    fi
  '';
}