[TohruSu]

Summary

When exclude or non-cap comes from setup.cfg or tox.ini, configparser returns a string, and that string becomes the argparse default as-is. find_py_files() then loops over it character by character, so almost every path matches. For example, with

[docformatter]
exclude = build

docformatter --check --recursive . checks nothing and exits 0. The same happens with the bracketed form used in the existing setup.cfg tests (exclude = ["src/", "tests/"]) and with a string value in pyproject.toml. non-cap has the same problem; there it turns into a substring check.

I couldn't find an issue for this. #276 touched the same code but was closed without merging.

Changes

Configurater._do_get_list_option() now builds the defaults for --exclude and --non-cap:

• TOML arrays are passed through.
• A bracketed list like ["build", "dist"] is parsed with ast.literal_eval.
• Anything else is split on whitespace, so build, build dist and one name per line all work, the same as nargs="*" on the command line.

flargs keeps the raw values, so the existing tests are unaffected.

Tests

New TestListOptionsFromConfigFile in tests/test_configuration_functions.py, 11 tests:

• setup.cfg / tox.ini with bracketed, single, space-separated and multi-line values
• pyproject.toml with a string and an array
• an end-to-end --check --recursive run with exclude = build

On current master 10 of them fail (the TOML array case already worked); with the fix all 11 pass.

Testing

Windows 10, Python 3.11:

• Full suite: 755 passed before, 766 after. The same 1 failure and 36 errors show up with and without this change: the errors come from fixtures that write to /tmp, and the failure is the Windows-only preserve_line_ending case.
• Because of the /tmp fixtures, test_exclude_from_setup_cfg and test_non_cap_from_setup_cfg didn't run here. I checked those configs by hand and they now produce lists.
• black, isort, ruff, pydocstyle, mypy, pylint and docformatter are clean on configuration.py.
• I haven't run it on Linux, so CI will be the first run there.