add area shielding

Protected areas will block unwanted effects from beacons placed by other players.

Fixes #11

.luacheckrc

@@ -19,4 +19,5 @@ read_globals = {
 	-- Mod Deps
 	"player_monoids",
 	"digilines",
+	"areas",
 }

README.md

@@ -47,6 +47,7 @@ Other mods can register additional beacon effects, or change or remove existing
 
 - [`player_monoids`](https://github.com/minetest-mods/player_monoids) (recommended)
 - [`digilines`](https://github.com/minetest-mods/digilines)
+- [`areas`](https://github.com/minetest-mods/areas)
 
 ## Installation
 

effects.lua

@@ -12,8 +12,11 @@ local function get_useable_effects(name, pos)
 			if distance <= range + 0.5 then
 				local effect = meta:get_string("effect")
 				if effect ~= "" and effect ~= "none" and beacon.effects[effect] then
-					useable_effects[effect] = true
-					useable = true
+					local owner = meta:get_string("owner")
+					if owner == "" or beacon.can_effect(pos, owner) then
+						useable_effects[effect] = true
+						useable = true
+					end
 				end
 			end
 		end

helpers.lua

@@ -59,3 +59,10 @@ function beacon.limit_range(range, level)
 	range = math.max(range, 1)
 	return range
 end
+
+function beacon.can_effect(pos, beacon_owner)
+	if beacon.has_areas and beacon.config.area_shielding then
+		return areas:canInteract(pos, beacon_owner)
+	end
+	return true
+end

init.lua

@@ -19,6 +19,7 @@ beacon.config = {
 	effect_range_3 = tonumber(minetest.settings:get("beacon_effect_range_4")) or 40,
 	effect_range_4 = tonumber(minetest.settings:get("beacon_effect_range_5")) or 50,
 	upgrade_item = minetest.settings:get("beacon_upgrade_item") or "default:diamondblock",
+	area_shielding = minetest.settings:get("beacon_area_shielding") or true,
 }
 
 beacon.colors = {
@@ -81,6 +82,8 @@ beacon.has_player_monoids = minetest.global_exists("player_monoids")
 
 beacon.has_digilines = minetest.global_exists("digilines")
 
+beacon.has_areas = minetest.global_exists("areas")
+
 beacon.modpath = minetest.get_modpath(minetest.get_current_modname())
 
 dofile(beacon.modpath.."/api.lua")

mod.conf

@@ -1,4 +1,4 @@
 name = beacon
 description = Adds colored beacons that can grant effects to players
 depends = default, dye
-optional_depends = player_monoids, digilines
+optional_depends = player_monoids, digilines, areas

settingtypes.txt

@@ -8,3 +8,4 @@ beacon_effect_range_2 (Level 2 beacon effect range) int 30
 beacon_effect_range_3 (Level 3 beacon effect range) int 40
 beacon_effect_range_4 (Level 4 beacon effect range) int 50
 beacon_upgrade_item (Beacon upgrade item) string default:diamondblock
+beacon_area_shielding (Protected areas block effects) bool false