-- originally written by nilninull

local dpms_mod = nil

local function on_property_change(name, value)
	print("RUN on property change", value, dpms_mod)
	if dpms_mod == nil and value then
		-- This code was checked on xset 1.2.3
		if os.execute("[ `xset q | sed -n '/^DPMS/,${/^  DPMS/s/^  DPMS is //p}'` == Enabled ]") == 0 then
			dpms_mod = true
		else
			dpms_mod = false
		end
	end
end

mp.observe_property("vo-configured", "bool", on_property_change)

local function dpms_mod_stop(event)
	if dpms_mod then
		os.execute("xset +dpms")
	end
end

mp.register_event("shutdown", dpms_mod_stop)

local function dpms_on_play(event)
	if dpms_mod then
		os.execute("xset -dpms")
	end
end

mp.register_event("playback-restart", dpms_on_play)

local function dpms_on_pause(name, value)
	if dpms_mod then
		if value then
			os.execute("xset +dpms")
		else
			os.execute("xset -dpms")
		end
	end
end

mp.observe_property("pause", "bool", dpms_on_pause)