colors.py

#!/usr/bin/env python

def twodigits(st):
  g = st[2:]
  if (len(g) == 1):
    g = '0' + g
  return g.upper()

def n2h(n):
  r = hex(n)
  return twodigits(r)

def num2hex(red, green, blue):
  return n2h(red) + n2h(green) + n2h(blue)

def hex2num(hexstr):
  r = int(hexstr[0:2],16)
  g = int(hexstr[2:4],16)
  b = int(hexstr[4:6],16)
  return (r,g,b)

def usage():
  print "usage:"
  print "     n2h int -> hexstring"
  print "     num2hex int int int -> hexstring"
  print "     hex2num hexstring -> three ints"

def main():
  import sys
  try:
    if (len(sys.argv) > 1):
      command = sys.argv[1]
      if (command == "n2h"):
        print n2h(int(sys.argv[2]))
      elif (command == "num2hex"):
        print num2hex(int(sys.argv[2]), int(sys.argv[3]), int(sys.argv[4]))
      elif (command == "hex2num"):
        print hex2num(sys.argv[2])
      else:
        usage()
    else:
      usage()
  except:
    usage()

if (__name__ == "__main__"):
  main()