feature(niri): use home-managers new niri-module to configure niri on my machines with host-specific additions

hosts/neon/configuration.nix

@@ -23,6 +23,9 @@
     ../../modules/nixos/vial.nix
   ];
 
+  # host-specific niri config (input devices, laptop binds)
+  home-manager.users.aaron.imports = [ ./niri.nix ];
+
   # set hostname
   networking.hostName = "neon";
 

hosts/neon/niri.nix

@@ -0,0 +1,34 @@
+# neon: laptop, built-in display is auto-configured by niri
+{ lib, ... }:
+
+let
+  brightness = step: {
+    _props.allow-when-locked = true;
+    spawn = [
+      "brightnessctl"
+      "--class=backlight"
+      "set"
+      step
+    ];
+  };
+in
+{
+  wayland.windowManager.niri.settings = {
+    input.touchpad = {
+      tap = { };
+      natural-scroll = { };
+    };
+
+    layout.gaps = lib.mkForce 10;
+
+    binds = {
+      "Print".screenshot = { };
+      "Ctrl+Print".screenshot-screen = { };
+      "Mod+Shift+P".power-off-monitors = { };
+
+      # finer brightness steps; mkForce, since spawn lists would otherwise be concatenated
+      "XF86MonBrightnessUp" = lib.mkForce (brightness "+1%");
+      "XF86MonBrightnessDown" = lib.mkForce (brightness "1%-");
+    };
+  };
+}