Darker fails with Type Error, exit code 1 after MacOS update

[zachnorton4C]

Describe the bug
After upgrading to MacOS Monterey 12.5.1, I am unable to get darker to run on pre-commit -- it fails with a TypeError.

To Reproduce
Steps to reproduce the behavior:

1. Attempt to create a new commit
2. Darker exits with code: 1
3. See traceback error:

Traceback (most recent call last):
  File "bin/darker", line 8, in <module>
    sys.exit(main())
  File "darker/__main__.py", line 196, in main
    args, config, config_nondefault = parse_command_line(argv)
  File "darker/command_line.py", line 163, in parse_command_line
    config = load_config(args.src)
  File "darker/config.py", line 37, in load_config
    path = find_project_root(tuple(srcs or ["."])) / "pyproject.toml"
TypeError: unsupported operand type(s) for /: 'tuple' and 'str'

Expected behavior
Until recent MasOS update, darker was running without issue.

Environment:

• OS: MacOS Monterey 12.5.1
• Python version 3.8.9
• Git version 2.37.3
• Darker version 1.5.0
• Black version 22.8.0
• other reformatter and linter versions isort==5.10.1

Additional context
I attempted with several earlier versions of black and darker and saw the same result.

[akaihola]

 File "darker/config.py", line 37, in load_config
   path = find_project_root(tuple(srcs or ["."])) / "pyproject.toml"

• Darker version 1.5.0

Hi @zachnorton4C, thanks for the issue report!

You don't seem to be running Darker 1.5.0 in the pre-commit environment, but version 1.2.x instead, since versions 1.2.0–1.2.4 are the only ones which had the find_project_root() call on line darker/config.py:37.

How did you initialize pre-commit? What does your .pre-commit-config.yaml look like?

[zachnorton4C]

Hi @akaihola Thank you for the follow up! Your question enlightened another path for me and my team and I were able to resolve this. Thanks!