add effect

{
    "name" : "Clock",
    "script" : "clock.py",
    "args" :
    {
        "offset" : 0,
        "hour-margin" : 2,
        "minute-margin" : 1,
        "second-margin" : 0,
        "hour-color" : [255, 0, 0],
        "minute-color" : [0, 255, 0],
        "second-color" : [0, 0, 255],
        "marker-color" : [255, 255, 255]
    }
}

import hyperion
import time
from datetime import datetime


def myRange(index, margin):
    return [i % hyperion.ledCount for i in range(index-margin, index+margin+1)]


""" Define some variables """
sleepTime = 1
ledCount = hyperion.ledCount


offset = hyperion.args.get('offset', 0)
direction = bool(hyperion.args.get('direction', False))


hourMargin = hyperion.args.get('hour-margin', 2)
minuteMargin = hyperion.args.get('minute-margin', 1)
secondMargin = hyperion.args.get('second-margin', 0)


hourColor = hyperion.args.get('hour-color', (255,0,0))
minuteColor = hyperion.args.get('minute-color', (0,255,0))
secondColor = hyperion.args.get('second-color', (0,0,255))


markerColor = hyperion.args.get('marker-color', (255,255,255))


marker = ledCount/4
markers = (0+offset, int(marker + offset) % ledCount, int(2*marker + offset) % ledCount, int(3*marker + offset) % ledCount)


""" The effect loop """
while not hyperion.abort():


    """ The algorithm to calculate the change in color """
    led_data = bytearray()


    now = datetime.now()
    h = now.hour
    m = now.minute
    s = now.second


    hmin = float(h+(1/60*m))

    if hmin > 12:
        hmin -= 12

    hour = float(hmin/12 * ledCount)
    led_hour = int(hour + offset) % ledCount


    minute = m/60. * ledCount
    led_minute = int(minute + offset) % ledCount


    second = s/60. * ledCount
    led_second = int(second + offset) % ledCount


    hourRange =  myRange(led_hour, hourMargin)
    minuteRange = myRange(led_minute, minuteMargin)
    secondRange = myRange(led_second, secondMargin)


    for i in range(ledCount):
        blend = [0, 0, 0]


        if i in markers:
            blend = markerColor


        if i in hourRange:
            blend = hourColor


        if i in minuteRange:
            blend = minuteColor


        if i in secondRange:
            blend = secondColor


        led_data += bytearray((int(blend[0]), int(blend[1]), int(blend[2])))


    """ send the data to hyperion """
    hyperion.setColor(led_data)


    """ sleep for a while """
    timediff = (datetime.now()-now).microseconds/1000000.
    time.sleep(sleepTime-timediff)