tray-tui: add module (#7415)

modules/programs/tray-tui.nix

@@ -0,0 +1,54 @@
+{
+  lib,
+  pkgs,
+  config,
+  ...
+}:
+let
+  inherit (lib)
+    mkIf
+    mkEnableOption
+    mkPackageOption
+    mkOption
+    ;
+
+  cfg = config.programs.tray-tui;
+  tomlFormat = pkgs.formats.toml { };
+in
+{
+  meta.maintainers = with lib.hm.maintainers; [ aguirre-matteo ];
+
+  options.programs.tray-tui = {
+    enable = mkEnableOption "tray-tui";
+    package = mkPackageOption pkgs "tray-tui" { nullable = true; };
+    settings = mkOption {
+      type = tomlFormat.type;
+      default = { };
+      example = {
+        sorting = false;
+        columns = 3;
+        key_map = {
+          left = "focus_left";
+          h = "focus_left";
+          right = "focus_right";
+          l = "focus_right";
+          up = "focus_up";
+          j = "focus_up";
+          down = "focus_down";
+          k = "focus_down";
+        };
+      };
+      description = ''
+        Configuration settings for tray-tui. All the available options
+        can be found here: <https://github.com/Levizor/tray-tui/blob/main/config_example.toml>
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+    home.packages = mkIf (cfg.package != null) [ cfg.package ];
+    xdg.configFile."tray-tui/config.toml" = mkIf (cfg.settings != { }) {
+      source = tomlFormat.generate "tray-tui-config" cfg.settings;
+    };
+  };
+}