Fix of a hang up at natsort sort func when opening file paths include '@' symbol.

[HirotsuguMINOWA]

This was fixed for a hang up at natsort sort func when opening file paths include '@' symbol.

MacOS file system can have '@' symbol inside a file path. But conventional labelme occurred exception due to that.

[wkentaro]

how do you get '@' in file path? (I use macOS too)

[HirotsuguMINOWA]

We can use the “@” symbol as same as normal symbols (eg. _, - and so on) unconsciously within file paths. (APFS（Apple File System) may be enable to use '@' in a file path).

I used '@' in a directory path "Google Drive - [email protected]", which occurred the exception.

For example in your terminal, input "touch ~/@.txt" which will make a file "@.txt" in your home folder.

[wkentaro]

so your only example is Google Drive?

[HirotsuguMINOWA]

This problem may be caused from NFC/NFD or multibyte characters (, I change my opinion).

You know that だ is recorded with た+" in macOS of NFD.

####### I invested some some cases.

# RClone(=connected to CloudStorage(GDrive)) + tmp_imgs -> OK (Succeeded to open a dir with images)
~/rclone_gdrive_research/tmp_imgs/[imgs+jsons]

# RClone(GDrive) + きずあり -> Hang up
~/rclone_gdrive_research/きずあり/[imgs+jsons]

# Local FS + 名称未設定フォルダ -> Hang up
~/名称未設定フォルダ/[imgs+jsons]

# Local FS + きずあり -> Hang up
~/きずあり/[imgs+jsons]

# Local FS + あいう -> OK
~/あいう/[imgs+jsons]

Error msgs

2025-10-08 01:46:20.388 | INFO     | labelme.config:get_config:66 - Loading config file from: /Users/account_me/.labelmerc
2025-10-08 01:46:20.722 | DEBUG    | labelme.widgets.canvas:set_ai_model_name:140 - Setting AI model to 'sam2:latest'
2025-10-08 01:46:26.662 | CRITICAL | labelme.__main__:_handle_exception:84 - Traceback (most recent call last):
  File "/Users/account_me/.local/pipx/.cache/a08b10f0b458157/lib/python3.13/site-packages/labelme/app.py", line 2136, in openDirDialog
    self.importDirImages(targetDirPath)
    ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^
  File "/Users/account_me/.local/pipx/.cache/a08b10f0b458157/lib/python3.13/site-packages/labelme/app.py", line 2185, in importDirImages
    filenames = self.scanAllImages(dirpath)
  File "/Users/account_me/.local/pipx/.cache/a08b10f0b458157/lib/python3.13/site-packages/labelme/app.py", line 2217, in scanAllImages
    images = natsort.os_sorted(images)
  File "/Users/account_me/.local/pipx/.cache/a08b10f0b458157/lib/python3.13/site-packages/natsort/natsort.py", line 839, in os_sorted
    return sorted(seq, reverse=reverse, key=os_sort_keygen(key))
  File "/Users/account_me/.local/pipx/.cache/a08b10f0b458157/lib/python3.13/site-packages/natsort/utils.py", line 341, in natsort_key
    return string_func(val)
  File "/Users/account_me/.local/pipx/.cache/a08b10f0b458157/lib/python3.13/site-packages/natsort/utils.py", line 552, in <lambda>
    return lambda x: tuple(map(str_split, path_splitter(x)))
                     ~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/account_me/.local/pipx/.cache/a08b10f0b458157/lib/python3.13/site-packages/natsort/utils.py", line 523, in func
    return final_transform(g, original)  # Apply the final transform.
  File "/Users/account_me/.local/pipx/.cache/a08b10f0b458157/lib/python3.13/site-packages/natsort/utils.py", line 776, in func
    return tuple(split_val)
  File "/Users/account_me/.local/pipx/.cache/a08b10f0b458157/lib/python3.13/site-packages/natsort/utils.py", line 577, in sep_inserter
    first = next(iterator)
  File "/Users/account_me/.local/pipx/.cache/a08b10f0b458157/lib/python3.13/site-packages/natsort/compat/fastnumbers.py", line 74, in <genexpr>
    return (fast_int(y, key=on_fail) for y in x)
            ~~~~~~~~^^^^^^^^^^^^^^^^
  File "/Users/account_me/.local/pipx/.cache/a08b10f0b458157/lib/python3.13/site-packages/natsort/compat/fake_fastnumbers.py", line 116, in fast_int
    return _uni(x, key(x)) if len(x) == 1 else key(x)
                                               ~~~^^^
OSError: [Errno 22] Invalid argument