minetest.register_on_protection_violation

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See minetest.register_on_protection_violation in the Lua API documentation.

Example

-- Show a message to protection violators
minetest.register_on_protection_violation(function(pos, name)
  if not mymod:can_interact(pos, name) then
    local pos_string = minetest.pos_to_string(pos)
    local owner_string = mymod:get_owner_string(pos)
    minetest.chat_send_player(name, pos_string.." is protected by "..owner_string)
  end
end)

-- Damage protection violators
minetest.register_on_protection_violation(function(pos, name)
  local player = minetest.get_player_by_name(name)
  if not player then return end
  player:set_hp(math.max(player:get_hp() - 1, 0))
end)