Add back Steam Deck and add experimental unstable

overlays/default.nix

@@ -1,8 +1,8 @@
-{ unstable, ... }:
+{ pkgs, ... }:
 {
-  nixpkgs.overlays = [
-    (import ./unstable { inherit unstable; })
-    (final: _prev: import ./packages { pkgs = final; })
-    (import ./mpv)
+  imports = [
+    ./unstable
+    ./packages
+    ./mpv
   ];
 }

overlays/mpv/default.nix

@@ -1,9 +1,14 @@
-(self: super: {
-  mpv = super.mpv.override {
-    scripts = with self.mpvScripts; [
-      mpris
-      sponsorblock
-      thumbnail
-    ];
-  };
-})
+{ unstable, ... }:
+{
+  nixpkgs.overlays = [
+    (self: super: {
+      mpv = super.mpv.override {
+        scripts = with self.mpvScripts; [
+          mpris
+          sponsorblock
+          thumbnail
+        ];
+      };
+    })
+  ];
+}

overlays/packages/default.nix

@@ -1,5 +1,9 @@
 { pkgs, ... }:
 {
-  xash3d = pkgs.callPackage ./xash3d {};
-  hlsdk = pkgs.callPackage ./hlsdk {};
+  nixpkgs.overlays = [
+    (final: _prev: {
+      xash3d = pkgs.callPackage ./xash3d {};
+      hlsdk = pkgs.callPackage ./hlsdk {};
+    })
+  ];
 }

overlays/unstable/default.nix

@@ -1,7 +1,11 @@
 { unstable, ... }:
-(final: prev: {
-  unstable = import unstable {
-    system = final.system;
-    config.allowUnfree = true;
-  };
-})
+{
+  nixpkgs.overlays = [
+    (final: prev: {
+      unstable = import unstable {
+        system = final.system;
+        config.allowUnfree = true;
+      };
+    })
+  ];
+}