command /gamma:
permission: nms.gamma
permission message: Nie posiadasz permisji do tej komendy (nms.gamma)
trigger:
    if {gamma.%player%} is not set or false:
        apply effect night vision to player for 999d
        send "Gamma zostala wlaczona" to player
        set {gamma.%player%} to true
    else if {gamma.%player%} is true:
        remove night vision from player
        send "Gamma zostala wylaczona" to player
        set {gamma.%player%} to false