configure sway

users/mara/config/swww.nix

@@ -0,0 +1,37 @@
+{ config, lib, pkgs, ... }:
+
+let
+  inherit (lib) getExe getExe' mkOption types;
+in
+
+{
+  options.custom.backgroundDir = mkOption {
+    default = config.home.homeDirectory + "/Pictures/Backgrounds";
+    type = with types; uniq str;
+  };
+  
+  config = {
+    services.swww.enable = true;
+    systemd.user = {
+      services.swww-randomize = {
+        Unit = {
+          Description = "randomly change the swww background image";
+          Requires = "swww.service";
+        };
+        Service = {
+          Type = "oneshot";
+          ExecStart = "${getExe pkgs.bash} -c '${getExe pkgs.findutils} ${config.custom.backgroundDir} -type f | ${getExe' pkgs.coreutils "shuf"} -n 1 | ${getExe' pkgs.findutils "xargs"} ${getExe pkgs.swww} img --transition-step 16'";
+        };
+        Install.WantedBy = [ "default.target" ];
+      };
+      timers.swww-randomize = {
+        Unit.Description = "randomly changes the swww background image";
+        Timer = {
+          Unit = "swww-random";
+          OnCalendar = "*-*-* *:00,30:00";
+        };
+        Install.WantedBy = [ "timers.target" ];
+      };
+    };
+  };
+}