[tasks] Add auto tagging from titles

vrobbler/apps/scrobbles/signals.py

@@ -6,6 +6,7 @@ from django.utils import timezone
 
 from scrobbles.models import Scrobble
 from scrobbles.tasks import MEDIA_TYPES, update_charts_for_timestamp
+from scrobbles.utils import tokenize_title_to_tags
 
 logger = logging.getLogger(__name__)
 
@@ -48,3 +49,20 @@ def _update_charts_for_timestamp(user, ts):
     day = ts.day
 
     update_charts_for_timestamp.delay(user.id, year, month, day, week)
+
+
+@receiver(post_save, sender=Scrobble)
+def add_tags_from_task_title(sender, instance, **kwargs):
+    if instance.media_type != Scrobble.MediaType.TASK:
+        return
+
+    title = instance.logdata.title
+    if not title:
+        return
+
+    new_tags = tokenize_title_to_tags(title)
+    existing_tags = {t.name for t in instance.tags.all()}
+
+    for tag in new_tags:
+        if tag not in existing_tags:
+            instance.tags.add(tag)

vrobbler/apps/scrobbles/utils.py

@@ -453,3 +453,64 @@ def next_url_if_exists(url: str) -> str:
 
     # If it doesn’t exist
     return ""
+
+
+STOPWORDS = {
+    "a",
+    "an",
+    "the",
+    "and",
+    "or",
+    "but",
+    "in",
+    "on",
+    "at",
+    "to",
+    "for",
+    "of",
+    "with",
+    "by",
+    "from",
+    "is",
+    "as",
+    "it",
+    "be",
+    "are",
+    "was",
+    "were",
+    "been",
+    "have",
+    "has",
+    "had",
+    "do",
+    "does",
+    "did",
+    "will",
+    "would",
+    "could",
+    "should",
+    "might",
+    "must",
+    "this",
+    "that",
+    "these",
+    "those",
+    "your",
+    "their",
+}
+
+
+def tokenize_title_to_tags(title: str) -> list[str]:
+    """Tokenize a title into tags, filtering common words and short tokens."""
+    if not title:
+        return []
+
+    cleaned = re.sub(r"[\(\)\[\]\{\}]", "", title)
+    cleaned = re.sub(r"[^\w\s]", "", cleaned)
+
+    words = [
+        w.lower()
+        for w in cleaned.split()
+        if w.lower() not in STOPWORDS and len(w) > 2
+    ]
+    return words