# alarm_clock.py
 
# Description: A simple Python program to make the computer act 
# like an alarm clock. Start it running from the command line 
# with a command line argument specifying the duration in minutes 
# after which to sound the alarm. It will sleep for that long, 
# and then beep a few times. Use a duration of 0 to test the 
# alarm immediiately, e.g. for checking that the volume is okay.
 
# Author: Vasudev Ram - http://www.dancingbison.com
 
import sys
import string
from time import sleep
 
sa = sys.argv
lsa = len(sys.argv)
if lsa != 2:
 print "Usage: [ python ] alarm_clock.py duration_in_minutes"
 print "Example: [ python ] alarm_clock.py 10"
 print "Use a value of 0 minutes for testing the alarm immediately."
 print "Beeps a few times after the duration is over."
 print "Press Ctrl-C to terminate the alarm clock early."
 sys.exit(1)
 
try:
 minutes = int(sa[1])
except ValueError:
 print "Invalid numeric value (%s) for minutes" % sa[1]
 print "Should be an integer >= 0"
 sys.exit(1)
 
if minutes < 0:
 print "Invalid value for minutes, should be >= 0"
 sys.exit(1)
 
seconds = minutes * 60
 
if minutes == 1:
 unit_word = " minute"
else:
 unit_word = " minutes"
 
try:
 if minutes > 0:
  print "Sleeping for " + str(minutes) + unit_word
  sleep(seconds)
 print "Wake up"
 for i in range(5):
  print chr(7),
  sleep(1)
except KeyboardInterrupt:
 print "Interrupted by user"
 sys.exit(1)
 
# EOF