Rewrite mapfix

init.lua

+local function mapfix(minp, maxp)
+	local vm = minetest.get_voxel_manip(minp, maxp)
+	vm:update_liquids()
+	vm:write_to_map()
+	vm:update_map()
+end
+
+local previous = -math.huge
+
+local default_size = tonumber(minetest.setting_get("mapfix_default_size")) or 40
+local max_size = tonumber(minetest.setting_get("mapfix_max_size")) or 50
+local delay = tonumber(minetest.setting_get("mapfix_delay")) or 15
+
 minetest.register_chatcommand("mapfix", {
 	params = "<size>",
 	description = "Recalculate the flowing liquids and the light of a chunk",
 	func = function(name, param)
 		local pos = minetest.get_player_by_name(name):getpos()
 		local size = tonumber(param) or 40
+		local privs = minetest.check_player_privs(name, {server=true})
+		local time = os.clock()
 
-		if size > 50 and not minetest.check_player_privs(name, {server=true}) then
-			return false, "You need the server privilege to exceed the radius of 50 blocks"
+		if not privs then
+			if size > 50 and not privs then
+				return false, "You need the server privilege to exceed the radius of " .. max_size .. " blocks"
+			elseif time - previous < 15 then
+				return false, "Wait at least " .. delay .. " seconds from the previous \"/mapfix\"."
+			end
+			previous = time
 		end
 
 		local minp = vector.round(vector.subtract(pos, size - 0.5))
 		local maxp = vector.round(vector.add(pos, size + 0.5))
 
-		-- use the voxelmanip to fix problems
-		local vm = minetest.get_voxel_manip(minp, maxp)
-		vm:update_liquids()
-		vm:write_to_map()
-		vm:update_map()
+		minetest.log("action", name .. " uses mapfix at " .. minetest.pos_to_string(vector.round(pos)) .. " with radius " .. size)
+		mapfix(minp, maxp)
 		return true, "Done."
 	end,
 })