cli: Allow changing the current file within the --stay-connected menu.

Add a "Change Target File" menu item that prompts the user to select a new file. This way the user can change projects without having to disconnect and reconnect. Once the file is selected, the program is compiled and downloaded, but it doesn't start.

Author: shaggysa

CHANGELOG.md

@@ -6,6 +6,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+- Added the `Change Target File` option to the `--stay-connected` menu. 
+    ([pybricksdev#123])
+
+[pybricksdev#123]: https://github.com/pybricks/pybricksdev/pull/123
+
 ## [2.1.1] - 2025-09-13
 
 ### Fixed

pybricksdev/cli/__init__.py

@@ -10,6 +10,7 @@
 import os
 import sys
 from abc import ABC, abstractmethod
+from enum import IntEnum
 from os import PathLike, path
 from tempfile import NamedTemporaryFile
 from typing import ContextManager, TextIO
@@ -239,6 +240,12 @@ def is_pybricks_usb(dev):
             if not args.stay_connected:
                 return
 
+            class ResponseOptions(IntEnum):
+                RECOMPILE_RUN = 0
+                RECOMPILE_DOWNLOAD = 1
+                CHANGE_TARGET_FILE = 2
+                EXIT = 3
+
             async def reconnect_hub():
                 if not await questionary.confirm(
                     "\nThe hub has been disconnected. Would you like to re-connect?"
@@ -264,6 +271,7 @@ async def reconnect_hub():
             response_options = [
                 "Recompile and Run",
                 "Recompile and Download",
+                "Change Target File",
                 "Exit",
             ]
             while True:
@@ -280,22 +288,50 @@ async def reconnect_hub():
                     response = await hub.race_disconnect(
                         hub.race_power_button_press(
                             questionary.select(
-                                "Would you like to re-compile your code?",
+                                f"Would you like to re-compile {os.path.basename(args.file.name)}?",
                                 response_options,
                                 default=(
-                                    response_options[0]
+                                    response_options[ResponseOptions.RECOMPILE_RUN]
                                     if args.start
-                                    else response_options[1]
+                                    else response_options[
+                                        ResponseOptions.RECOMPILE_DOWNLOAD
+                                    ]
                                 ),
                             ).ask_async()
                         )
                     )
-                    with _get_script_path(args.file) as script_path:
-                        if response == response_options[0]:
-                            await hub.run(script_path, wait=True)
-                        elif response == response_options[1]:
-                            await hub.download(script_path)
-                        else:
+
+                    match response_options.index(response):
+
+                        case ResponseOptions.RECOMPILE_RUN:
+                            with _get_script_path(args.file) as script_path:
+                                await hub.run(script_path, wait=True)
+
+                        case ResponseOptions.RECOMPILE_DOWNLOAD:
+                            with _get_script_path(args.file) as script_path:
+                                await hub.download(script_path)
+
+                        case ResponseOptions.CHANGE_TARGET_FILE:
+                            args.file.close()
+                            while True:
+                                try:
+                                    args.file = open(
+                                        await hub.race_disconnect(
+                                            hub.race_power_button_press(
+                                                questionary.path(
+                                                    "What file would you like to use?"
+                                                ).ask_async()
+                                            )
+                                        )
+                                    )
+                                    break
+                                except FileNotFoundError:
+                                    print("The file was not found. Please try again.")
+                            # send the new target file to the hub
+                            with _get_script_path(args.file) as script_path:
+                                await hub.download(script_path)
+
+                        case _:
                             return
 
                 except HubPowerButtonPressedError: