Pre-construct frontend index.html (#609)

* Pre-construct frontend index.html

* Only preload things that matter

* Fix entry point in dev mode

* Template Service worker url

* Update referenced service worker

script/fingerprint_frontend.py

@@ -7,28 +7,26 @@ import hashlib
 import json
 import argparse
 from os import path
+import re
 
 parser = argparse.ArgumentParser(description='Generate fingerprints of frontend files.')
 parser.add_argument('--base_dir', type=str, help='Base dir to look for files.', default='hass_frontend')
 args = parser.parse_args()
 base_dir = args.base_dir + '/'
 fingerprint_file = path.join(base_dir, '__init__.py')
+panel_match = re.compile(r'ha-panel-((\w|-)+)\.html')
 
 
 def fingerprint():
-    """Fingerprint the frontend files."""
-    files = (glob.glob(base_dir + '**/*.html') +
-             glob.glob(base_dir + '*.html') +
-             glob.glob(base_dir + 'core.js') +
-             glob.glob(base_dir + 'compatibility.js'))
-
+    """Fingerprint the panels."""
+    files = glob.glob(base_dir + 'panels/*.html')
     md5s = OrderedDict()
 
     for fil in sorted(files):
-        name = fil[len(base_dir):]
+        panel = panel_match.search(fil).groups(0)[0]
         with open(fil) as fp:
             md5 = hashlib.md5(fp.read().encode('utf-8')).hexdigest()
-        md5s[name] = md5
+        md5s[panel] = md5
 
     template = "FINGERPRINTS = {}\n"
     result = template.format(json.dumps(md5s, indent=4))