advanced date extraction

index_for_search.py

@@ -69,6 +69,52 @@ def get_hit_count(relative_path):
     row = cursor.fetchone()
     return row["hit_count"] if row else 0
 
+
+def extract_date_from_string(string_with_date):
+    # grab X.Y.Z where X,Y,Z are 1–4 digits
+    m = re.search(r'(\d{1,4}\.\d{1,2}\.\d{1,4})', string_with_date)
+    if not m:
+        return None
+
+    date_str = m.group(1)
+    parts = date_str.split('.')
+    
+    # 1) Unambiguous “last group = YYYY”
+    if len(parts) == 3 and len(parts[2]) == 4:
+        fmt = '%d.%m.%Y'
+
+    # 2) Unambiguous “first group = YYYY”
+    elif len(parts) == 3 and len(parts[0]) == 4:
+        fmt = '%Y.%m.%d'
+
+    # 3) Ambiguous “XX.XX.XX” → prefer DD.MM.YY, fallback to YY.MM.DD
+    elif len(parts) == 3 and all(len(p) == 2 for p in parts):
+        # try last-group-as-year first
+        try:
+            dt = datetime.strptime(date_str, '%d.%m.%y')
+            return dt.strftime('%Y-%m-%d')
+        except ValueError:
+            # fallback to first-group-as-year
+            fmt = '%y.%m.%d'
+
+    else:
+        # optional: handle ISO with dashes
+        if '-' in date_str:
+            try:
+                dt = datetime.strptime(date_str, '%Y-%m-%d')
+                return dt.strftime('%Y-%m-%d')
+            except ValueError:
+                return None
+        return None
+
+    # parse with whichever fmt we settled on
+    try:
+        dt = datetime.strptime(date_str, fmt)
+        return dt.strftime('%Y-%m-%d')
+    except ValueError:
+        return None
+
+
 def updatefileindex():
     cursor = search_db.cursor()
 
@@ -169,21 +215,7 @@ def updatefileindex():
                     titel = None
                     name = None
                     
-                # extract the date from path using regex (supports YYYY.MM.DD, DD.MM.YYYY or DD.MM.YY)
-                date_match = re.search(r'(\d{1,2}\.\d{1,2}\.\d{2,4}|\d{4}\.\d{2}\.\d{2})', relative_path)
-                if date_match:
-                    date_str = date_match.group(1)
-                    performance_date = None
-                    for fmt in ('%Y.%m.%d', '%d.%m.%Y', '%d.%m.%y', '%Y-%m-%d'):
-                        try:
-                            date_obj = datetime.strptime(date_str, fmt)
-                            # Convert to ISO format YYYY-MM-DD
-                            performance_date = date_obj.strftime('%Y-%m-%d')
-                            break
-                        except ValueError:
-                            continue
-                else:
-                    performance_date = None
+                performance_date = extract_date_from_string(relative_path)
 
                 scanned_files.append((relative_path, foldername, entry.name, filetype, category, titel, name, performance_date, site, transcript, hit_count))
                 current_keys.add((relative_path, entry.name))