style: demo's output formatting without breaking API tests

app.py

@@ -23,6 +23,7 @@ from nlp4web_codebase.ir.data_loaders.dm import Document
 from nlp4web_codebase.ir.models import BaseRetriever
 from nlp4web_codebase.ir.data_loaders import Split
 from scipy.sparse._csc import csc_matrix
+import json
 
 
 # ----------------- PRE SETUP ----------------- #
@@ -570,7 +571,8 @@ def search(query: str, index_dir: str = index_dir) -> List[Hit]:  # , topk:int =
     return hits
 
 
-'''
+# Since the test cases limit using Non-Interface or TextBox as output, ->
+# -> these are obselete for passing tests, but better formatted.
 # Function for formatted display of results
 def format_hits_md(hits: List[Hit]) -> str:
     if not hits:
@@ -584,6 +586,8 @@ def format_hits_md(hits: List[Hit]) -> str:
             f"* Text: {hit['text'] or 'No text available.'}\n"
         )
     return "\n".join(formatted)
+
+
 # to return pure json data as a list of json objects
 def format_hits_json(hits: List[Hit]):
     if not hits:
@@ -592,27 +596,41 @@ def format_hits_json(hits: List[Hit]):
     # json format
     for hit in hits:
         formatted.append(
-            {
-                "cid": hit['cid'],
-                "score": hit['score'],
-                "text": hit['text'] or ''
-            }
+            {"cid": hit["cid"], "score": hit["score"], "text": hit["text"] or ""}
         )
     return formatted
 
+
+def format_hits_jsonstr(hits: List[Hit]):
+    if not hits:
+        return
+    formatted = "["
+    for hit in hits:
+        formatted += (
+            json.dumps(
+                {"cid": hit["cid"], "score": hit["score"], "text": hit["text"] or ""},
+                separators=(",", ":"),
+                indent=4,
+            )
+            + ",\n"
+        )
+    formatted = formatted[:-2] + "]"
+    return formatted
+
+
 # Gradio wrapper
-def interface_search(query: str) -> str: # , topk: int = 10
+def interface_search(query: str) -> str:  # , topk: int = 10
     """Wrapper for Gradio interface to call search function and format results."""
     try:
-        hits = search(query) # , topk=topk
-        return format_hits_json(hits) # [json, md]
+        hits = search(query)  # , topk=topk
+        return format_hits_jsonstr(hits)  # [jsonstr, json, md]
     except Exception as e:
         return f"Error: {str(e)}"
-'''
+
 
 # app interface
 demo = gr.Interface(
-    fn=search,  # interface_search to format Markdown or JSON
+    fn=interface_search,  # interface_search to format Markdown or JSON
     inputs=[
         gr.Textbox(label="Search Query", placeholder="Type your search query"),
         # gr.Number(label="Number of Results (Top-k)", value=10),