Save database at shutdown.

init.lua

@@ -115,6 +115,17 @@ end
 --fun_caves.print_recipes()
 
 
+-- Attempt to save data at shutdown (as well as periodically).
+minetest.register_on_shutdown(function()
+	local out = io.open(fun_caves.world..'/fun_caves_data.txt','w')	
+	if out then
+		print('Fun Caves: Saving database at shutdown')
+		out:write(minetest.serialize(fun_caves.db))
+		out.close()
+	end
+end)
+
+
 local hunger_mod = minetest.get_modpath("hunger")
 fun_caves.hunger_id = {}