add tags.py

src/utils/tags.py

@@ -0,0 +1,37 @@
+def tag_user_input(file_path, user_input):
+    """
+    Tag user input with keywords/substances from a file.
+    
+    This function:
+    1. Loads tags from the specified file (preserving original case)
+    2. Detects matches in user input (case-insensitive, partial matches)
+    3. Returns a list of matching tags in their original case
+    
+    Args:
+        file_path (str): Path to the file containing tags (one per line)
+        user_input (str): The user's input text to search for tags
+        
+    Returns:
+        list: List of matching tags in their original case from the file
+    """
+    # Load tags (preserve original case)
+    tags_original = []
+    tags_lower = []
+    with open(file_path, 'r', encoding='utf-8') as f:
+        for line in f:
+            stripped = line.strip()
+            if stripped:
+                tags_original.append(stripped)
+                tags_lower.append(stripped.lower())
+    
+    # Convert user input to lowercase for case-insensitive matching
+    user_input_lower = user_input.lower()
+    
+    # Find matching tags (case-insensitive, partial matches)
+    matching_tags = []
+    for i, tag_lower in enumerate(tags_lower):
+        if tag_lower in user_input_lower:
+            matching_tags.append(tags_original[i])
+    
+    return matching_tags
+