Store YAML frontmatter in notes.

frontmatter_utils.py

@@ -0,0 +1,70 @@
+import yaml
+import re
+from datetime import datetime
+
+def parse_frontmatter(content):
+    """
+    Parse YAML frontmatter from markdown content.
+    Returns a tuple of (metadata dict, content without frontmatter)
+    """
+    if not content or not content.strip().startswith('---'):
+        return {}, content
+    
+    # Match frontmatter pattern
+    pattern = r'^---\s*\n(.*?)\n---\s*\n(.*)$'
+    match = re.match(pattern, content, re.DOTALL)
+    
+    if not match:
+        return {}, content
+    
+    try:
+        # Parse YAML frontmatter
+        metadata = yaml.safe_load(match.group(1)) or {}
+        content_body = match.group(2)
+        return metadata, content_body
+    except yaml.YAMLError:
+        # If YAML parsing fails, return original content
+        return {}, content
+
+def create_frontmatter(metadata):
+    """
+    Create YAML frontmatter from metadata dict.
+    """
+    if not metadata:
+        return ""
+    
+    # Filter out None values and empty strings
+    filtered_metadata = {k: v for k, v in metadata.items() if v is not None and v != ''}
+    
+    if not filtered_metadata:
+        return ""
+    
+    return f"---\n{yaml.dump(filtered_metadata, default_flow_style=False, sort_keys=False)}---\n\n"
+
+def update_frontmatter(content, metadata):
+    """
+    Update or add frontmatter to content.
+    """
+    _, body = parse_frontmatter(content)
+    frontmatter = create_frontmatter(metadata)
+    return frontmatter + body
+
+def extract_title_from_content(content):
+    """
+    Extract title from content, checking frontmatter first, then first line.
+    """
+    metadata, body = parse_frontmatter(content)
+    
+    # Check if title is in frontmatter
+    if metadata.get('title'):
+        return metadata['title']
+    
+    # Otherwise extract from first line of body
+    lines = body.strip().split('\n')
+    for line in lines:
+        line = line.strip()
+        if line:
+            # Remove markdown headers if present
+            return re.sub(r'^#+\s*', '', line)
+    
+    return 'Untitled Note'