from time import sleep
import os
from subprocess import Popen, PIPE
path=r"/storeM/fat/screenshots/active/"
archiveFilename = r'/storeM/fat/screenshots/7z/test3.7z'
#ensure path string ends in '/'
if path[len(path)-1] != '/':
	path = path + r'/'

dirList=os.listdir(path)

maxStackSize = 20
splitBatches = {}
batchStack = 0
currentStack = []
currentStackNumber = 0

#let's make some batches of a given size (ignore anything greater for now)
for file in dirList:
	if batchStack < maxStackSize:
		batchStack = batchStack + 1
		currentStack.append(path + file)
	else:
		batchStack = 0
		splitBatches[currentStackNumber]=currentStack
		currentStack = []
		currentStackNumber = currentStackNumber + 1
		

def checkCommand(cmd):
	p = Popen(cmd, stdout=PIPE, shell=True)
	p.wait()
	result = p.communicate()[0]
	assert 'Everything is Ok' in result

for batch in splitBatches:
	batchOfFilenames = str(splitBatches[batch]).replace(',','').replace("'",'').replace('"','').replace('[','').replace(']','')
	#print batchOfFilenames
	checkCommand(r'7za a '+ archiveFilename +r' '+ batchOfFilenames)
	os.system('rm '+ batchOfFilenames)