sway: add settings option

modules/services/window-managers/i3-sway/sway.nix

@@ -272,7 +272,18 @@ let
       ${pkgs.xvfb-run}/bin/xvfb-run ${swayPackage}/bin/sway --config "$target" --validate --unsupported-gpu
     '';
 
-    text = concatStringsSep "\n"
+    text = let
+      # include and set should be at the top of the configuration
+      setSettings = lib.filterAttrs (key: _: key == "set") cfg.settings;
+      includeSettings = lib.filterAttrs (key: _: key == "include") cfg.settings;
+      otherSettings =
+        lib.filterAttrs (key: _: key != "set" && key != "include") cfg.settings;
+    in lib.optionalString (setSettings != { })
+    (lib.hm.generators.toSwayConf { } setSettings)
+    + lib.optionalString (includeSettings != { })
+    (lib.hm.generators.toSwayConf { } includeSettings)
+    + lib.optionalString (otherSettings != { })
+    (lib.hm.generators.toSwayConf { } otherSettings) + concatStringsSep "\n"
     ((optional (cfg.extraConfigEarly != "") cfg.extraConfigEarly)
       ++ (if cfg.config != null then
         with cfg.config;
@@ -327,8 +338,7 @@ let
         )
       else
         [ ]) ++ (optional cfg.systemd.enable systemdActivation)
-        ++ (optional (!cfg.xwayland) "xwayland disable")
-        ++ [ cfg.extraConfig ]);
+      ++ (optional (!cfg.xwayland) "xwayland disable") ++ [ cfg.extraConfig ]);
   };
 
   defaultSwayPackage = pkgs.sway.override {
@@ -473,6 +483,20 @@ in {
       '';
     };
 
+    settings = lib.mkOption {
+      type = with lib.types;
+        let
+          valueType =
+            oneOf [ int float str path (listOf str) (attrsOf valueType) ] // {
+              description = "Sway configuration value";
+            };
+        in valueType;
+      default = { };
+      description = ''
+        Configuration for `sway`. See `sway(5)` for supported values.
+      '';
+    };
+
     config = mkOption {
       type = types.nullOr configModule;
       default = { };
@@ -518,6 +542,14 @@ in {
       assertions = [
         (hm.assertions.assertPlatform "wayland.windowManager.sway" pkgs
           platforms.linux)
+        {
+          assertion = cfg.settings != { } -> cfg.extraConfigEarly == "";
+          message = ''
+            `wayland.windowManager.sway.extraConfigEarly` is not needed when
+            using `wayland.windowManager.sway.settings`, it'll properly handle
+            `set` and `include` configuration.
+          '';
+        }
       ];
 
       home.packages = optional (cfg.package != null) cfg.package