sketchCompatibility.py

#!/usr/bin/python
""" Convert sketch files to open with older versions of Sketch.
Based on https://sketchtalk.io/discussion/2546/file-backwards-compatibility
"""
__author__ = "David Mihal"
__license__ = "GPL"

import zipfile
import sys
import json

appVersion = "43.1"
build = 39012
version = 88

if len(sys.argv) == 1:
  print "Usage: sketchCompatibility.py <drawing.sketch>"
  exit()

filename = sys.argv[1]
newFilename = filename.replace('.sketch', '_compatable.sketch')

zin = zipfile.ZipFile (filename, 'r')
zout = zipfile.ZipFile (newFilename, 'w')
for item in zin.infolist():
  buffer = zin.read(item.filename)
  if (item.filename == 'meta.json'):
    meta = json.loads(buffer)
    meta["version"] = version
    meta["compatibilityVersion"] = version
    meta["appVersion"] = appVersion
    meta["build"] = build

    meta['created']["appVersion"] = appVersion
    meta['created']["build"] = build
    meta['created']["compatibilityVersion"] = version
    meta['created']["version"] = version

    buffer = json.dumps(meta)
    print buffer

  zout.writestr(item, buffer)

zout.close()
zin.close()