Generate an HTML5 manifest automatically with bottle.py

manifest.py

@route('/app.manifest')
def manifest():
  """ Generate an HTML 5 offline manifest automatically """
  last = 0
  lines = []
  response.content_type = "ext/cache-manifest"
  for (path, dirs, files) in os.walk('app'):
    last = max(max(map(lambda x: os.path.getmtime(os.path.join(path, x)), files)),last)
    map(lambda x: lines.append(os.path.join(os.path.relpath(path,'app'), x)), filter(lambda x: os.path.splitext(x)[1] in ['.css','.js','.png'], files))
  response.headers['Last-Modified'] = time.strftime("%a, %d %b %Y %H:%M:%S GMT", time.gmtime(last))
  return '\n'.join(sum([["# Version %d" % last,'CACHE MANIFEST'],lines ,['NETWORK:','*']],[]))