add alias for disable builtin keyboard

hosts/nixos/thinkpad/system.nix

@@ -7,6 +7,7 @@
     ../../../modules/desktop.nix
     ../../../modules/wireguard.nix
     ../../../modules/login-display.nix
+    ../../../modules/keyboard-toggle.nix
   ];
 
   # Bootloader - standard UEFI setup
@@ -230,26 +231,6 @@
   services.acpid.enable = true;
   services.upower.enable = true;
 
-  # Advanced key remapping with keyd
-  services.keyd = {
-    enable = true;
-    keyboards = {
-      default = {
-        ids = [ "*" ];
-        settings = {
-          main = {
-            # Map Caps Lock to Left Control
-            capslock = "leftcontrol";
-            # Map Right Control to Caps Lock
-            rightcontrol = "capslock";
-            # Map Left Alt to Super (Windows key)
-            leftalt = "leftmeta";
-          };
-        };
-      };
-    };
-  };
-
   # Apply XKB config to console (TTY) as well
   console.useXkbConfig = true;
 

modules/keyboard-toggle.nix

@@ -0,0 +1,52 @@
+{ config, pkgs, ... }:
+
+let
+  keyboard-toggle = pkgs.writeShellScriptBin "keyboard-toggle" ''
+    # Find the AT keyboard event device
+    EVENT_DEVICE=$(grep -l "AT Translated Set 2 keyboard" /sys/class/input/event*/device/name | sed 's|/device/name||' | sed 's|.*/||')
+    PID_FILE="/tmp/keyboard-grab-$USER.pid"
+
+    if [ -z "$EVENT_DEVICE" ]; then
+      echo "✗ Could not find AT keyboard device"
+      exit 1
+    fi
+
+    # Check if grabber is running
+    if [ -f "$PID_FILE" ] && kill -0 $(cat "$PID_FILE") 2>/dev/null; then
+      # Keyboard is disabled, enable it
+      sudo kill $(cat "$PID_FILE")
+      rm -f "$PID_FILE"
+      echo "✓ Built-in keyboard enabled"
+    else
+      # Keyboard is enabled, disable it by grabbing the device
+      sudo ${pkgs.evtest}/bin/evtest --grab /dev/input/$EVENT_DEVICE > /dev/null 2>&1 &
+      echo $! > "$PID_FILE"
+      echo "✓ Built-in keyboard disabled"
+    fi
+  '';
+in
+{
+  # Add the script and required tools to system packages
+  environment.systemPackages = [
+    keyboard-toggle
+    pkgs.libinput
+    pkgs.evtest
+  ];
+
+  # Add convenient shell alias
+  environment.shellAliases = {
+    kbt = "keyboard-toggle";
+  };
+
+  # Add sudoers rule for passwordless keyboard toggling
+  security.sudo.extraRules = [{
+    users = [ "yanlin" ];
+    commands = [{
+      command = "${pkgs.evtest}/bin/evtest --grab /dev/input/*";
+      options = [ "NOPASSWD" ];
+    } {
+      command = "${pkgs.coreutils}/bin/kill";
+      options = [ "NOPASSWD" ];
+    }];
+  }];
+}