Spelling fix in CONTRIBUTING.md (#1547)

[etc/vim.git] / src / black / __init__.py

diff --git a/src/black/__init__.py b/src/black/__init__.py
index 2b2d3d88c73a501a57bc2faa0022ee179553e0d2..3d0a2d690694ced9dbee089fe64c17d34b76a774 100644 (file)
--- a/src/black/__init__.py
+++ b/src/black/__init__.py
@@ -471,7 +471,7 @@ def target_version_option_callback(
     ),
     is_eager=True,
     callback=read_pyproject_toml,
-    help="Read configuration from PATH.",
+    help="Read configuration from FILE path.",
 )
 @click.pass_context
 def main(
@@ -5825,8 +5825,8 @@ def gen_python_files(
 def find_project_root(srcs: Iterable[str]) -> Path:
     """Return a directory containing .git, .hg, or pyproject.toml.
 
-    That directory can be one of the directories passed in `srcs` or their
-    common parent.
+    That directory will be a common parent of all files and directories
+    passed in `srcs`.
 
     If no directory in the tree contains a marker that would specify it's the
     project root, the root of the file system is returned.
@@ -5834,11 +5834,20 @@ def find_project_root(srcs: Iterable[str]) -> Path:
     if not srcs:
         return Path("/").resolve()
 
-    common_base = min(Path(src).resolve() for src in srcs)
-    if common_base.is_dir():
-        # Append a fake file so `parents` below returns `common_base_dir`, too.
-        common_base /= "fake-file"
-    for directory in common_base.parents:
+    path_srcs = [Path(src).resolve() for src in srcs]
+
+    # A list of lists of parents for each 'src'. 'src' is included as a
+    # "parent" of itself if it is a directory
+    src_parents = [
+        list(path.parents) + ([path] if path.is_dir() else []) for path in path_srcs
+    ]
+
+    common_base = max(
+        set.intersection(*(set(parents) for parents in src_parents)),
+        key=lambda path: path.parts,
+    )
+
+    for directory in (common_base, *common_base.parents):
         if (directory / ".git").exists():
             return directory