Fixed /export for timestamp, agent name (jupyterlab#854)

* Enhanced `/export` for timestamp, agent name

(1) Added seconds to the end of the timestamp/

(2) If user provides a filename, we do not use the timestamp

(3) If user does not provide a filename, we use "chat_history"+timestamp

(4) Make sure the correct Agent name is used in the exported output.

* update docs for export

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Amended export

Based on comments from Jason Weill

* Update docs/source/users/index.md

Co-authored-by: Jason Weill <93281816+JasonWeill@users.noreply.github.com>

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Jason Weill <93281816+JasonWeill@users.noreply.github.com>

docs/source/users/index.md

@@ -511,7 +511,7 @@ The `/learn` command also provides downloading and processing papers from the [a
 ```
 
 ### Exporting chat history
-Use the `/export` command to export the chat history from the current session to a markdown file named `chat_history-YYYY-MM-DD-HH-mm.md`. Using `/export <file_name>` will export the chat history to `<file_name>-YYYY-MM-DD-HH-mm.md` instead. You can export chat history as many times as you like in a single session. Each successive export will include the entire chat history up to that point in the session.
+Use the `/export` command to export the chat history from the current session to a markdown file named `chat_history-YYYY-MM-DD-HH-mm-ss.md`. You can also specify a filename using `/export <file_name>`. Each export will include the entire chat history up to that point in the session.
 
 
 ### Fixing a code cell with an error

packages/jupyter-ai/jupyter_ai/chat_handlers/export.py

@@ -23,7 +23,8 @@ def __init__(self, *args, **kwargs):
 
     def chat_message_to_markdown(self, message):
         if isinstance(message, AgentChatMessage):
-            return f"**Agent**: {message.body}"
+            agent = self.config_manager.persona.name
+            return f"**{agent}**: {message.body}"
         elif isinstance(message, HumanChatMessage):
             return f"**{message.client.display_name}**: {message.body}"
         else:
@@ -35,11 +36,14 @@ async def process_message(self, message: HumanChatMessage):
             self.chat_message_to_markdown(msg) for msg in self._chat_history
         )
         args = self.parse_args(message)
-        chat_filename = (
-            args.path[0] if (args.path and args.path[0] != "") else "chat_history"
+        chat_filename = (  # if no filename, use "chat_history" + timestamp
+            args.path[0]
+            if (args.path and args.path[0] != "")
+            else f"chat_history-{datetime.now():%Y-%m-%d-%H-%M-%S}.md"
         )  # Handles both empty args and double tap <Enter> key
-        chat_filename = f"{chat_filename}-{datetime.now():%Y-%m-%d-%H-%M}.md"
-        chat_file = os.path.join(self.root_dir, chat_filename)
+        chat_file = os.path.join(
+            self.root_dir, chat_filename
+        )  # Do not use timestamp if filename is entered as argument
         with open(chat_file, "w") as chat_history:
             chat_history.write(markdown_content)
         self.reply(f"File saved to `{chat_file}`")