#! /usr/bin/env python3
usage = "backupToZip: usage backupToZip [directory] backup given directory to a zip file, incrementing filename if name already exists"

import zipfile, os, sys

if len(sys.argv)<1:
    print(usage)
    sys.exit()

dir = os.path.realpath(sys.argv[1])

#figure out filename based on what already exists.
number = 1
while True:
    zipFilename = os.path.basename(dir)+'-'+str(number)+'.zip'
    if not os.path.exists(zipFilename):
        break
    number += 1

print(F'Creating {zipFilename}')
backupZip = zipfile.ZipFile(zipFilename, 'w')

for dirName, subDirList, fileList in os.walk(dir):
    #print(f'Adding files in {dirName}')
    backupZip.write(dirName)

    for fileName in fileList:
        #lets not backup other backup files.
        newBase = os.path.basename(dir)+'-'
        if fileName.startswith(newBase) and fileName.endswith('.zip'):
            print(f'skipping {fileName}, is backup file.')
            continue
        print(f'adding {fileName}')
        backupZip.write(os.path.join(dirName, fileName))
backupZip.close()
print('done')