#compdef nice

shift words
(( CURRENT-- ))

if [[ $CURRENT -gt 1 && $words[1] = ([-+](-|)|-n)<-> ]]; then
    shift words
    (( CURRENT -- ))
elif [[ $CURRENT -gt 2 && $words[1] = -n ]]; then
    shift 2 words
    (( CURRENT -= 2 ))
fi

_normal