update j:Keywords once per day

tasks.py

@@ -1,18 +1,23 @@
 # -*- coding: utf-8 -*-
 # vi:si:et:sw=4:sts=4:ts=4
 from datetime import datetime
+from collections import Counter
 
+import ox
 from celery.task import periodic_task
 from celery.schedules import crontab
 from django.db import transaction
 
 import itemlist.models
 import item.models
+import annotation.models
+import text.models
 
 @periodic_task(run_every=crontab(hour=6, minute=0), queue='encoding')
 def cron(**kwargs):
     update_double_imdb()
     outofcopyright()
+    update_keywords()
 
 def outofcopyright():
     for i in item.models.Item.objects.filter(sort__year__lt=datetime.now().year - 60, level=2):
@@ -32,3 +37,16 @@ def update_double_imdb():
 
     transaction.commit_unless_managed()
 
+
+def update_keywords():
+    t = text.models.Text.get('j:Keywords')
+    keywords = Counter([a['value']
+        for a in annotation.models.Annotation.objects.filter(layer='keywords').all().values('value')
+    ])
+    data = ['<ul>']
+    for k in sorted(keywords.keys(), key=lambda k: ox.sort_string('%s %s' % (keywords[k], k)), reverse=True):
+        data.append('<li>%d <a href="/clip/keywords==%s">%s</a>' %((keywords[k], k.replace(' ', '_'), k)))
+    data.append('</ul>')
+    t.text = '\n'.join(data)
+    t.save()
+