Provide compatibility with Black 24.2

.github/workflows/python-package.yml

@@ -91,7 +91,7 @@ jobs:
           - '3.10'
           - '3.11'
           - '3.12-dev'
-        constraints: ['black==22.12.0']
+        constraints: ['']
         post_install: ['']
         include:
           - os: ubuntu-latest

CHANGES.rst

@@ -8,6 +8,8 @@ Added
 
 Fixed
 -----
+- Black 24.2 compatibility by using the new `darkgraylib.files.find_project_root`
+  instead of the implementation in Black.
 
 
 1.7.3_ - 2024-02-27

constraints-oldest.txt

@@ -4,7 +4,7 @@
 # interpreter and Python ependencies. Keep this up-to-date with minimum
 # versions in `setup.cfg`.
 airium==0.2.3
-black==21.8b0
+black==22.3.0
 defusedxml==0.7.1
 flake8-2020==1.6.1
 flake8-bugbear==22.1.11

setup.cfg

@@ -27,7 +27,7 @@ package_dir =
 packages = find:
 install_requires =
     # NOTE: remember to keep `constraints-oldest.txt` in sync with these
-    black>=21.5b1,<24.2  # upper limit until incompatibility fixed
+    black>=22.3.0
     darkgraylib @ git+https://github.com/akaihola/darkgraylib.git@main
     graylint @ git+https://github.com/akaihola/graylint.git@main
     toml>=0.10.0
@@ -52,7 +52,7 @@ color =
 test =
     # NOTE: remember to keep `constraints-oldest.txt` in sync with these
     airium>=0.2.3
-    black>=21.7b1,<24.2  # prevent Mypy error about `gen_python_files`, see issue #189
+    black>=22.3.0
     cryptography>=3.3.2  # through twine, fixes CVE-2020-36242
     defusedxml>=0.7.1
     flynt>=0.76,<0.78

src/darker/__main__.py

@@ -34,8 +34,8 @@
 from darker.import_sorting import apply_isort, isort
 from darker.utils import debug_dump, glob_any
 from darker.verification import ASTVerifier, BinarySearch, NotEquivalentError
-from darkgraylib.black_compat import find_project_root
 from darkgraylib.config import show_config_if_debug
+from darkgraylib.files import find_project_root
 from darkgraylib.git import (
     PRE_COMMIT_FROM_TO_REFS,
     STDIN,
@@ -564,7 +564,7 @@ def main(  # pylint: disable=too-many-locals,too-many-branches,too-many-statemen
         # In other modes, only reformat files which have been modified.
         if git_is_repository(root):
             # Get the modified files only.
-            repo_root = find_project_root([str(root)])
+            repo_root = find_project_root((str(root),))
             changed_files = {
                 (repo_root / file).relative_to(root)
                 for file in git_get_modified_python_files(paths, revrange, repo_root)

src/darker/black_diff.py

@@ -41,7 +41,6 @@
 from black import FileMode as Mode
 from black import (
     TargetVersion,
-    find_pyproject_toml,
     format_str,
     parse_pyproject_toml,
     re_compile_maybe_verbose,
@@ -53,6 +52,7 @@
 from black.files import gen_python_files
 from black.report import Report
 
+from darker.files import find_pyproject_toml
 from darkgraylib.config import ConfigurationError
 from darkgraylib.utils import TextDocument
 

src/darker/files.py

@@ -0,0 +1,27 @@
+"""Helper functions for working with files and directories."""
+
+from typing import Optional, Tuple
+
+from black import err, find_user_pyproject_toml
+
+from darkgraylib.files import find_project_root
+
+
+def find_pyproject_toml(path_search_start: Tuple[str, ...]) -> Optional[str]:
+    """Find the absolute filepath to a pyproject.toml if it exists"""
+    path_project_root = find_project_root(path_search_start)
+    path_pyproject_toml = path_project_root / "pyproject.toml"
+    if path_pyproject_toml.is_file():
+        return str(path_pyproject_toml)
+
+    try:
+        path_user_pyproject_toml = find_user_pyproject_toml()
+        return (
+            str(path_user_pyproject_toml)
+            if path_user_pyproject_toml.is_file()
+            else None
+        )
+    except (PermissionError, RuntimeError) as e:
+        # We do not have access to the user-level config directory, so ignore it.
+        err(f"Ignoring user configuration directory due to {e!r}")
+        return None

src/darker/import_sorting.py

@@ -8,7 +8,7 @@
 from darker.exceptions import IncompatiblePackageError, MissingPackageError
 from darker.git import EditedLinenumsDiffer
 from darker.utils import glob_any
-from darkgraylib.black_compat import find_project_root
+from darkgraylib.files import find_project_root
 from darkgraylib.utils import DiffChunk, TextDocument
 
 try:

src/darker/tests/test_files.py

@@ -0,0 +1,22 @@
+"""Test for the `darker.files` module."""
+
+import io
+from contextlib import redirect_stderr
+from pathlib import Path
+from unittest.mock import MagicMock, patch
+
+from darker import files
+
+
+@patch("darker.files.find_user_pyproject_toml")
+def test_find_pyproject_toml(find_user_pyproject_toml: MagicMock) -> None:
+    """Test `files.find_pyproject_toml` with no user home directory."""
+    find_user_pyproject_toml.side_effect = RuntimeError()
+    with redirect_stderr(io.StringIO()) as stderr:
+        # end of test setup
+
+        result = files.find_pyproject_toml(path_search_start=(str(Path.cwd().root),))
+
+    assert result is None
+    err = stderr.getvalue()
+    assert "Ignoring user configuration" in err