nixos/niri: init module (#348193)

nixos/doc/manual/release-notes/rl-2411.section.md

@@ -104,6 +104,8 @@
 
 - [Flood](https://flood.js.org/), a beautiful WebUI for various torrent clients. Available as [services.flood](options.html#opt-services.flood).
 
+- [Niri](https://github.com/YaLTeR/niri), a scrollable-tiling Wayland compositor. Available as [programs.niri](options.html#opt-programs.niri.enable).
+
 - [Firefly-iii Data Importer](https://github.com/firefly-iii/data-importer), a data importer for Firefly-III. Available as [services.firefly-iii-data-importer](options.html#opt-services.firefly-iii-data-importer)
 
 - [QGroundControl], a ground station support and configuration manager for the PX4 and APM Flight Stacks. Available as [programs.qgroundcontrol](options.html#opt-programs.qgroundcontrol.enable).

nixos/modules/module-list.nix

@@ -312,6 +312,7 @@
   ./programs/wayland/hyprland.nix
   ./programs/wayland/labwc.nix
   ./programs/wayland/miracle-wm.nix
+  ./programs/wayland/niri.nix
   ./programs/wayland/river.nix
   ./programs/wayland/sway.nix
   ./programs/wayland/uwsm.nix

nixos/modules/programs/wayland/niri.nix

@@ -0,0 +1,55 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  cfg = config.programs.niri;
+in
+{
+  options.programs.niri = {
+    enable = lib.mkEnableOption "Niri, a scrollable-tiling Wayland compositor";
+
+    package = lib.mkPackageOption pkgs "niri" { };
+  };
+
+  config = lib.mkIf cfg.enable (
+    lib.mkMerge [
+      {
+        environment.systemPackages = [ cfg.package ];
+
+        services = {
+          displayManager.sessionPackages = [ cfg.package ];
+
+          # Recommended by upstream
+          # https://github.com/YaLTeR/niri/wiki/Important-Software#portals
+          gnome.gnome-keyring.enable = lib.mkDefault true;
+        };
+
+        systemd.packages = [ cfg.package ];
+
+        xdg.portal = {
+          enable = lib.mkDefault true;
+
+          configPackages = [ cfg.package ];
+
+          # Recommended by upstream, required for screencast support
+          # https://github.com/YaLTeR/niri/wiki/Important-Software#portals
+          extraPortals = [ pkgs.xdg-desktop-portal-gnome ];
+        };
+      }
+
+      (import ./wayland-session.nix {
+        inherit lib pkgs;
+        enableWlrPortal = false;
+        enableXWayland = false;
+      })
+    ]
+  );
+
+  meta.maintainers = with lib.maintainers; [
+    getchoo
+    sodiboo
+  ];
+}