#!/usr/bin/env python
import base64, re, argparse

parser = argparse.ArgumentParser(description='CSS-Embed PNG images as data-URIs')
parser.add_argument('files', metavar='file', nargs="+", type=str,
                   help='path to a css file')

img = re.compile("url\('?\"?(.*\.png)'?\"?\)")
repl = "url(data:image/png;base64,%s)"

cssfiles = parser.parse_args().files

if "swapcase" in dir(["a"]):
  cssfiles = [cssfiles]

for cssfile in cssfiles:
	css = open(cssfile, "r").read()

	for image_path in img.findall(css):
		data = base64.b64encode(open(image_path, "r").read())
		pattern = "url\('?\"?%s'?\"?\)" % image_path
		css = re.sub(re.compile(pattern), repl % data, css)

	f = open(cssfile, "w")
	f.write(css)
	f.close()