flake: added zellij to run dev scripts

flake.nix

@@ -10,14 +10,33 @@
     };
   };
 
-  outputs = {
-    self,
-    nixpkgs,
-    ags,
-  }: let
+  outputs =
+    { nixpkgs, ags, ... }:
+    let
       system = "x86_64-linux";
       pkgs = nixpkgs.legacyPackages.${system};
-  in {
+      layout =
+        pkgs.writeText "layout.kdl"
+          # kdl
+          ''
+            layout {
+                pane {
+                    pane name="command"
+                    pane command="bash" {
+                        name "ags"
+                        args "-c" "ags run ./app.ts"
+                    }
+                }
+            }
+          '';
+      devRunScript = pkgs.writeShellScriptBin "dev-run" ''
+        zellij --layout ${layout} attach --create ags
+      '';
+      devStopScript = pkgs.writeShellScriptBin "dev-stop" ''
+        zellij delete-session --force ags || true
+      '';
+    in
+    {
       packages.${system} = {
         default = ags.lib.bundle {
           inherit pkgs;
@@ -36,6 +55,9 @@
       devShells.${system} = {
         default = pkgs.mkShell {
           buildInputs = [
+            devRunScript
+            devStopScript
+            pkgs.zellij
             # includes all Astal libraries
             # ags.packages.${system}.agsFull