areas/protector.lua

local radius = minetest.settings:get("areasprotector_radius") or 8

local function cyan(str)
	return minetest.colorize("#00FFFF", str)
end

local function red(str)
	return minetest.colorize("#FF5555", str)
end

minetest.register_node(":areasprotector:protector", {
	description = "Protector Block",
	groups = {cracky = 1},
	tiles = {
		"default_stonebrick_carved.png",
		"default_stonebrick_carved.png",
		"default_stonebrick_carved.png^areasprotector_stone.png"
	},
	paramtype = "light",
	drawtype = "nodebox",
	node_box = {
		type = "fixed",
		fixed = {-0.5, -0.5, -0.5, 0.5, 0.5, 0.5}
	},

	on_place = function(itemstack, player, pointed)
		local pos = pointed.above
		local pos1 = vector.add(pos, vector.new(radius, radius, radius))
		local pos2 = vector.add(pos, vector.new(-radius, -radius, -radius))
		local name = player:get_player_name()

		if not minetest.is_protected_action(pos, name) then
			local perm, err = areas:canPlayerAddArea(pos1, pos2, name)
			if not perm then
				minetest.chat_send_player(name, red("You are not allowed to protect that area: ") .. err)
				return itemstack
			end
			local id = areas:add(name, "Protector Block", pos1, pos2)
			areas:save()
			minetest.chat_send_player(name,
				("The area from %s to %s has been protected as #%s")
				:format(cyan(minetest.pos_to_string(pos1)), cyan(minetest.pos_to_string(pos2)), cyan(id)))
			minetest.set_node(pos, {name = "areasprotector:protector"})
			local meta = minetest.get_meta(pos)
			meta:set_string("infotext", ("Protecting area %d, Owned by %s"):format(id, name))
			meta:set_int("area_id", id)
			meta:set_string("owner", name)
			itemstack:take_item()
			return itemstack
		end
	end,

	after_dig_node = function(_, _, oldmetadata, digger)
		if oldmetadata and oldmetadata.fields then
			local owner = oldmetadata.fields.owner
			local id = tonumber(oldmetadata.fields.area_id)
			local playername = digger:get_player_name()
			if areas.areas[id] and areas:isAreaOwner(id, owner) then
				areas:remove(id)
				areas:save()
			end
		end
	end,

	on_punch = function(pos)
		local objs = minetest.get_objects_inside_radius(pos, .5) -- a radius of .5 since the entity serialization seems to be not that precise
		local displayed = false
		for _, o in pairs(objs) do
			if not o:is_player() and o:get_luaentity().name == "areasprotector:display" then
				o:remove()
				return
			end
		end
		if not displayed then -- nothing was removed: there wasn't the entity
			minetest.add_entity(pos, "areasprotector:display")
		end
	end
})

-- entities code below (and above) mostly copied-pasted from Zeg9's protector mod

minetest.register_entity(":areasprotector:display", {
	physical = false,
	collisionbox = {0},
	visual = "wielditem",
	visual_size = {x = 1.0 / 1.5, y = 1.0 / 1.5}, -- wielditem seems to be scaled to 1.5 times original node size
	textures = {"areasprotector:display_node"},
	timer = 0,
	on_step = function(self, dtime)
		self.timer = self.timer + dtime
		if self.timer > 4 or minetest.get_node(self.object:getpos()).name ~= "areasprotector:protector" then
			self.object:remove()
		end
	end
})

local nb_radius = radius + 0.55

minetest.register_node(":areasprotector:display_node", {
	tiles = {"areasprotector_display.png"},
	walkable = false,
	drawtype = "nodebox",
	node_box = {
		type = "fixed",
		fixed = {
			-- sides
			{-nb_radius, -nb_radius, -nb_radius, -nb_radius, nb_radius, nb_radius},
			{-nb_radius, -nb_radius, nb_radius, nb_radius, nb_radius, nb_radius},
			{nb_radius, -nb_radius, -nb_radius, nb_radius, nb_radius, nb_radius},
			{-nb_radius, -nb_radius, -nb_radius, nb_radius, nb_radius, -nb_radius},
			-- top
			{-nb_radius, nb_radius, -nb_radius, nb_radius, nb_radius, nb_radius},
			-- bottom
			{-nb_radius, -nb_radius, -nb_radius, nb_radius, -nb_radius, nb_radius},
			-- middle (surround protector)
			{-.55, -.55, -.55, .55, .55, .55}
		}
	},
	selection_box = {type = "regular"},
	paramtype = "light",
	groups = {dig_immediate = 3, not_in_creative_inventory = 1},
	drop = ""
})

minetest.register_craft({
	output = "areasprotector:protector",
	type = "shapeless",
	recipe = {
		"default:stonebrickcarved", "default:stonebrickcarved", "default:stonebrickcarved",
		"default:stonebrickcarved", "mesecons:wire_00000000_off", "default:stonebrickcarved",
		"default:stonebrickcarved", "default:stonebrickcarved", "default:stonebrickcarved"
	}
})