waylogout: added configuration module

90% of the code is copied over from swaylock so thanks to the creator of
that module!

modules/modules.nix

@@ -269,6 +269,7 @@ let
     ./programs/pywal.nix
     ./programs/rbenv.nix
     ./programs/watson.nix
+    ./programs/waylogout.nix
     ./programs/waybar.nix
     ./programs/wezterm.nix
     ./programs/wlogout.nix

modules/programs/waylogout.nix

@@ -0,0 +1,56 @@
+{ pkgs, config, lib, ... }:
+
+with lib;
+
+let cfg = config.programs.waylogout;
+in {
+  meta.maintainers = [ hm.maintainers.noodlez ];
+
+  options.programs.waylogout = {
+    enable = mkOption {
+      default = false;
+      type = lib.types.bool;
+      example = true;
+      description = ''
+        Whether or not to enable waylogout.
+      '';
+    };
+
+    package = mkPackageOption pkgs "waylogout" { };
+
+    settings = mkOption {
+      type = with types; attrsOf (oneOf [ bool float int str ]);
+      default = { };
+      description = ''
+        Default arguments to {command}`waylogout`. An empty set
+        disables configuration generation.
+      '';
+      example = {
+        color = "808080";
+        poweroff-command = "systemctl poweroff";
+        reboot-command = "systemctl reboot";
+        scaling = "fit";
+        effect-blur = "7x4";
+        screenshots = true;
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "programs.waylogout" pkgs
+        lib.platforms.linux)
+    ];
+
+    home.packages = [ cfg.package ];
+
+    xdg.configFile."waylogout/config" = mkIf (cfg.settings != { }) {
+      text = concatStrings (mapAttrsToList (n: v:
+        if v == false then
+          ""
+        else
+          (if v == true then n else n + "=" + builtins.toString v) + "\n")
+        cfg.settings);
+    };
+  };
+}