add delete where command

handlers/delete_collection.py

@@ -1,9 +1,40 @@
 from argparse import Namespace
 
-from chroma_functions import delete_collection
+from chroma_functions import delete_collection, delete_data
+
+
+def _parse_where_clause(where_clause: str) -> dict[str, str]:
+    condition, separator, value = where_clause.partition("=")
+
+    if separator == "":
+        raise ValueError("Invalid --where value. Expected <condition>=<value>.")
+
+    condition = condition.strip()
+    value = value.strip()
+
+    if not condition or not value:
+        raise ValueError("Invalid --where value. Expected <condition>=<value>.")
+
+    return {condition: value}
 
 
 def handle_delete_collection(args: Namespace) -> int:
     delete_collection(args.collection)
     print(f"Deleted collection '{args.collection}'.")
     return 0
+
+
+def handle_delete_records(args: Namespace) -> int:
+    try:
+        where = _parse_where_clause(args.where)
+    except ValueError as exc:
+        args.error_message = str(exc)
+        raise
+
+    deleted = delete_data(args.collection, where)
+    condition, value = next(iter(where.items()))
+    print(
+        f"Deleted {deleted} record(s) from collection '{args.collection}' "
+        f"where {condition}={value}."
+    )
+    return 0