fix(title): title generation avoid lines w/o words

Author: Daniele Briggi

src/sqlite_rag/models/document.py

@@ -55,11 +55,11 @@ def extract_document_title(self, fallback_first_line: bool = False) -> str | Non
         if match:
             return match.group(1).strip()
 
-        # Fallback: first non-empty line
+        # Fallback: first non-empty line with at least one word
         if fallback_first_line:
             for line in self.content.splitlines():
                 line = line.strip()
-                if line:
+                if line and re.search(r"\w", line):
                     return line[: self.GENERATED_TITLE_MAX_CHARS]
 
         return None

tests/models/test_document.py

@@ -45,3 +45,11 @@ def test_extract_document_title_without_heading(
         assert (
             doc.extract_document_title(fallback_first_line=fallback) == expected_title
         )
+
+    def test_extract_document_title_with_a_word(self):
+        content = "---\n    \n  Leading spaces line with a word."
+        doc = Document(content=content, metadata={})
+        assert (
+            doc.extract_document_title(fallback_first_line=True)
+            == "Leading spaces line with a word."
+        )