feat: helper script to toggle touchpad input

hosts/default/home/kde.nix

@@ -20,6 +20,20 @@
       esac
       ${pkgs.kdePackages.libkscreen}/bin/kscreen-doctor output.eDP-1.rotation.$direction
     '')
+
+    (pkgs.writeShellScriptBin "toggle-touchpad" ''
+      touchpad=$(awk '$0 ~ /touchpad/I { split(FILENAME, path, "/") } END { print path[5] }' /sys/class/input/event*/device/name)
+      device=/org/kde/KWin/InputDevice/$touchpad
+      get_property=org.freedesktop.DBus.Properties.Get
+      interface=org.kde.KWin.InputDevice
+      if test $(qdbus org.kde.KWin $device $get_property $interface enabled) = true; then
+        toggle=false
+      else
+        toggle=true
+      fi
+
+      qdbus org.kde.KWin $device $interface.enabled $toggle
+    '')
   ];
   home.file.".config/kglobalshortcutsrc".source = ./sources/kglobalshortcutsrc;
   home.file.".config/kwinrc".source = ./sources/kwinrc;