text: from . import *
  from datetime import datetime
  
  PARSE_STR = "%Y-%m-%d %H:%M:%S"
  
  class UptimeCommand(Command):
  	name = "uptime"
  	shell = False
  	command = "uptime -s"
  	desc = "show uptime and check if reboot happened"
  
  	def parse(output):
  		if not output:
  			return None 
  		try:
  			return datetime.strptime(output.strip(), PARSE_STR)
  		except ValueError:
  			return None
  
  	def compare(prev, cur):
  		scur = cur.strftime(PARSE_STR)
  		if not prev:
  			return [D("system has been up since %s" % scur)]
  		sprev = prev.strftime(PARSE_STR)
  		if cur != prev:
  			if cur > prev:
  				return [W("system rebooted since last check (up since: %s)" % scur)]
  			else:
  				return [W("time traveling detected as uptime went from %s to %s" % (sprev, scur))]
  		else:
  			return [D("system didn't reboot since last check (up since: %s)" % scur)]
  