loading.lua

local game_events = wesnoth.game_events
local time_utils = wesnoth.require "~/add-ons/Brent/lua/time/utils.lua"

-- timedelta is the local time change per turn
timedelta = 4
turns_per_day = 6


local old_on_load = game_events.on_load
function game_events.on_load(cfg)
	turns_per_day = cfg.turns_per_day or turns_per_day
	timedelta = 24/turns_per_day
	old_on_load(cfg)
end


local old_on_save = game_events.on_save
function game_events.on_save()
	local cfg = old_on_save()
	table.insert(cfg, {"time", {turns_per_day=turns_per_day}})
	return cfg
end


local old_on_event = game_events.on_event
function game_events.on_event(name)
	if name == "new turn" then
		local time = time_utils.get_time()
		time_utils.set_time(time + timedelta)
	end
	if old_on_event ~= nil then old_on_event(name) end
end

utils.lua

local time_utils = {}


local time_variable = 'time'


function time_utils.get_time()
	return wesnoth.get_variable(time_variable) or 0
end


function time_utils.set_time(time)
	wesnoth.set_variable(time_variable, time)
end


return time_utils