Adapt to new darkgraylib.find_project_root()

- needs hashable input sequence of paths
- doesn't return method of finding the root

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/files.py

@@ -5,11 +5,9 @@
 from darkgraylib.files import find_project_root
 
 
-def find_pyproject_toml(
-    path_search_start: Tuple[str, ...], stdin_filename: Optional[str] = None
-) -> Optional[str]:
+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, stdin_filename)
+    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)

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: