Windowsのキーボードレイアウトを英字配列と日本語配列でトグルする

toggleWindowsKeyboardLayoutBetweenUSandJP.ps1

param([switch] $help, [switch] $laptop)

process {
    if ($help) {
        echo ".\toggleWindowsKeyboardLayoutBetweenUSandJP.ps1         : キーボードレイアウトを日本語／英字配列でトグルします"
        echo ".\toggleWindowsKeyboardLayoutBetweenUSandJP.ps1 -laptop : ノートPCで外部キーボード接続時だけ英字配列"
        echo ".\toggleWindowsKeyboardLayoutBetweenUSandJP.ps1 -help   : Help の表示"
        return
    }

    $item = "HKLM:\SYSTEM\CurrentControlSet\Services\i8042prt\Parameters"

    function toUSKeyboard() {
        Set-ItemProperty $item -name "LayerDriver JPN"          -value "kbd101.dll"
        Set-ItemProperty $item -name OverrideKeyboardIdentifier -value "PCAT_101KEY"
        Set-ItemProperty $item -name OverrideKeyboardSubtype    -value 0
        Set-ItemProperty $item -name OverrideKeyboardType       -value 7
        echo "Changed to US keyboad layout. Please restart your computer."
    }

    function toJPKeyboard() {
        Set-ItemProperty $item -name "LayerDriver JPN"          -value "kbd106.dll"
        Set-ItemProperty $item -name OverrideKeyboardIdentifier -value "PCAT_106KEY"
        Set-ItemProperty $item -name OverrideKeyboardSubtype    -value 2
        Set-ItemProperty $item -name OverrideKeyboardType       -value 7
        echo "Changed to JP keyboad layout. Please restart your computer."
    }
    
    function laptopSetting() {
        Set-ItemProperty $item -name "LayerDriver JPN"          -value "kbd101.dll"
        Set-ItemProperty $item -name OverrideKeyboardIdentifier -value "PCAT_101KEY"
        Set-ItemProperty $item -name OverrideKeyboardSubtype    -value 2
        echo "Please restart your computer."
    }
    
    if ($laptop) {
        laptopSetting
    } elseif ((Get-ItemProperty $item)."LayerDriver JPN" -eq "kbd101.dll") {
        toJPKeyboard
    } elseif ((Get-ItemProperty $item)."LayerDriver JPN" -eq "kbd106.dll") {
        toUSKeyboard
    }
}