add on screen keyboard to lpt2

homeConfigurations/muede/niri.nix

@@ -2,10 +2,12 @@
   pkgs,
   config,
   lib,
+  device,
   ...
 }:
 {
-  config = {
+  config = lib.mkMerge [
+    {
       home.sessionVariables.NIXOS_OZONE_WL = "1";
       home.packages = with pkgs; [
         xwayland-satellite
@@ -433,5 +435,41 @@
           };
         };
       };
+    }
+
+    # lpt2's keyboard is flaky, so give it an on-screen keyboard.
+    # squeekboard auto-shows on focused text fields via the input-method
+    # protocol, but that doesn't catch every app, so Mod+K force-toggles it
+    # over D-Bus (sm.puri.OSK0), which is squeekboard's own control interface.
+    (
+      let
+        squeekboard-toggle = pkgs.writeShellApplication {
+          name = "squeekboard-toggle";
+          runtimeInputs = [ pkgs.systemd ];
+          text = ''
+            dest=sm.puri.OSK0
+            path=/sm/puri/OSK0
+            iface=sm.puri.OSK0
+            current=$(busctl --user get-property "$dest" "$path" "$iface" Visible | cut -d' ' -f2)
+            if [ "$current" = "true" ]; then
+              busctl --user call "$dest" "$path" "$iface" SetVisible b false
+            else
+              busctl --user call "$dest" "$path" "$iface" SetVisible b true
+            fi
+          '';
+        };
+      in
+      lib.mkIf (device == "muede-lpt2") {
+        home.packages = [ pkgs.squeekboard ];
+
+        programs.niri.settings = {
+          spawn-at-startup = [
+            { command = [ (lib.getExe' pkgs.squeekboard "squeekboard") ]; }
+          ];
+
+          binds."Mod+K".action.spawn = lib.getExe squeekboard-toggle;
         };
       }
+    )
+  ];
+}