[trends] Allow disabling one or many or all trends

vrobbler/apps/trends/utils.py

@@ -3,6 +3,7 @@ from datetime import timedelta
 
 from django.utils import timezone
 from trends.models import PERIOD_CHOICES, TrendResult
+from trends.trends import TREND_REGISTRY
 
 logger = logging.getLogger(__name__)
 
@@ -35,6 +36,13 @@ TREND_PERIOD_OVERRIDES = {
 }
 
 
+def get_disabled_trends(user):
+    profile = user.profile
+    if profile.trends_disabled:
+        return set(TREND_REGISTRY.keys())
+    return set(profile.disabled_trends or [])
+
+
 def get_supported_periods(trend_slug):
     if trend_slug in TREND_PERIOD_OVERRIDES:
         slugs = TREND_PERIOD_OVERRIDES[trend_slug]