#!/usr/bin/env python
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import sys
import os
import string

import rospy

# imports the DemuxList service 
from topic_tools.srv import DemuxList

USAGE = 'USAGE: demux_list DEMUX_NAME'

def call_srv(m):
    # There's probably a nicer rospy way of doing this
    s = m + '/list'
    print("Waiting for service \"%s\""%(s))
    rospy.wait_for_service(s)
    print("Listing topics from demux \"%s\""%(m))
    try:
        srv = rospy.ServiceProxy(s, DemuxList)
        resp = srv()
        if resp:
            print(resp.topics)
        return resp
    except rospy.ServiceException, e:
        print("Service call failed: %s"%e)

def usage():
    return "%s "%sys.argv[0]

if __name__ == "__main__":
    args = rospy.myargv()
    if len(args) != 2:
        print(USAGE)
        sys.exit(1)

    m = args[1]
    call_srv(m)
