setup walker and elephant

home/modules/elephant/default.nix

@@ -0,0 +1,43 @@
+{
+  config,
+  lib,
+  pkgs,
+  pkgs-unstable,
+  ...
+}:
+let
+  cfg = config.services.elephant;
+  wrappedPackage = pkgs.symlinkJoin {
+    inherit (cfg.package) name meta;
+    paths = [ cfg.package ];
+    nativeBuildInputs = [ pkgs.makeBinaryWrapper ];
+    postBuild = ''
+      wrapProgram $out/bin/elephant \
+        --prefix PATH : ${lib.makeBinPath [ pkgs.bash ]}
+    '';
+  };
+in
+{
+  options.services.elephant = {
+    enable = lib.mkEnableOption "Enable Elephant";
+    package = lib.mkOption {
+      type = lib.types.package;
+      default = pkgs-unstable.elephant;
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    systemd.user.services.elephant = {
+      Unit = {
+        Description = "Elephant";
+        After = [ "niri.service" ];
+        Wants = [ "niri.service" ];
+      };
+      Service = {
+        ExecStart = lib.getExe wrappedPackage;
+        Restart = "on-failure";
+      };
+      Install.WantedBy = [ "graphical-session.target" ];
+    };
+  };
+}