on rightclick on anvil:
    cancel event # Zapobiegamy otworzeniu się GUI Kowadla
    set {_item} to player's tool # Ustalamy item gracza
    if {_item} is not any pickaxe or any sword or any axe or any shovel or bow or fishing rod:
        send "&cNie mozesz naprawic tego przedmiotu!"
        stop
    open chest with 3 rows named "&lNaprawa itemu" to player
    set slot 4 of player's current inventory to {_item}
    # i dalej...
    
on inventory click:
    if inventory name of player's current inventory is "&lNaprawa itemu":
        cancel event