monkeypatch_primaryattack_glua

-- Some SWEP (weapon_some_swep)
function SWEP.PrimaryAttack()
    print("Pew Pew")
end

-- Monkeypatch
local some_swep = weapons.GetStored("weapon_some_swep")
local original_primary = some_swep.Psome_swep.PrimaryAttack
function some_swep.PrimaryAttack()
    print("Getting ready to shoot...")
    original_primary()
end