capturetheflag/mods/ctf/ctf_map/time_sky.lua

local BASE_TIME_SPEED = 72

function ctf_map.update_time()
	local time = ctf_map.map.start_time
	local mult = ctf_map.map.time_speed or 1
	if time then
		minetest.set_timeofday(time)
	else
		minetest.set_timeofday(0.4)
	end

	minetest.settings:set("time_speed", BASE_TIME_SPEED * mult)
end

function ctf_map.skybox_exists(subdir, filename)
	return ctf_map.file_exists(subdir, {
		filename .. "_skybox_1.png",
		filename .. "_skybox_2.png",
		filename .. "_skybox_3.png",
		filename .. "_skybox_4.png",
		filename .. "_skybox_5.png",
		filename .. "_skybox_6.png"
	})
end

function ctf_map.set_skybox(player)
	if ctf_map.map.skybox then
		local prefix = ctf_map.map.filename .. "_skybox_"
		local skybox_textures = {
			prefix .. "1.png",  -- up
			prefix .. "2.png",  -- down
			prefix .. "3.png",  -- east
			prefix .. "4.png",  -- west
			prefix .. "5.png",  -- south
			prefix .. "6.png"   -- north
		}
		player:set_sky(0xFFFFFFFF, "skybox", skybox_textures, false)
	else
		player:set_sky(0xFFFFFFFF, "regular", {}, true)
	end
end

function ctf_map.set_skybox_all()
	for _, player in pairs(minetest.get_connected_players()) do
		ctf_map.set_skybox(player)
	end
end

minetest.register_on_joinplayer(function(player)
	if ctf_map.map then
		ctf_map.set_skybox(player)
	end
end)