Purge unused image files in docs

frappe_docs_remove_unused_images.py

# run this from the docs folder

from __future__ import unicode_literals

import os, re

images = []
for basepath, folders, files in os.walk("."):
	for f in files:
			key, extn = f.rsplit(".", 1)
			if extn in ("html", "md"):
				f = open(os.path.join(basepath, f), "r")
				content = f.read()
				images += re.findall("""{{.?docs_base_url.?}}([^'"\)]+)""", content)

missing, total = [], []

for basepath, folders, files in os.walk("."):
	if "assets" in basepath:
		for f in files:
			total.append(f)
			iname = os.path.join(basepath, f)[1:]
			if iname.encode("utf-8") not in images:
				missing.append(iname)
				os.remove(os.path.join(basepath, f))

print len(images), len(missing)