add --set XXX to directly control fan speed

fand.py

@@ -118,6 +118,16 @@ if __name__ == "__main__":
 	s = Sensor(cfg.sensor.source, cfg.sensor.weight)
 	p = PWM(cfg.pwm.chip, cfg.pwm.channel, cfg.pwm.period)
 	
+	if len(sys.argv) == 3 and sys.argv[1] == "--set":
+		try:
+			percentage = int(sys.argv[2])
+		except:
+			print("--set must be followed by a number")
+			sys.exit(1)
+		
+		p.set_percent(percentage)
+		sys.exit(0)
+	
 	while True:
 		temperature = s.measure()
 		percentage = linlut(temperature, cfg.map)