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Find project root correctly (#1518)
authorLihu Ben-Ezri-Ravin <lbenezriravin@starry.com>
Wed, 24 Jun 2020 09:09:07 +0000 (05:09 -0400)
committerGitHub <noreply@github.com>
Wed, 24 Jun 2020 09:09:07 +0000 (10:09 +0100)
Ensure root dir is a common parent of all inputs
Fixes #1493

src/black/__init__.py
tests/test_black.py

index 2b2d3d88c73a501a57bc2faa0022ee179553e0d2..d4c6e62bdbfb078f26199f78fa72dd7556cd35f1 100644 (file)
@@ -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.
 
 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.
 
     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()
 
     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
 
         if (directory / ".git").exists():
             return directory
 
index 88839d86c5a77df47d1c819add99845d4c7a992c..3ed5daa4b494afb5b8a0918d8f60e7426f623201 100644 (file)
@@ -1801,6 +1801,28 @@ class BlackTestCase(unittest.TestCase):
         self.assertEqual(config["exclude"], r"\.pyi?$")
         self.assertEqual(config["include"], r"\.py?$")
 
         self.assertEqual(config["exclude"], r"\.pyi?$")
         self.assertEqual(config["include"], r"\.py?$")
 
+    def test_find_project_root(self) -> None:
+        with TemporaryDirectory() as workspace:
+            root = Path(workspace)
+            test_dir = root / "test"
+            test_dir.mkdir()
+
+            src_dir = root / "src"
+            src_dir.mkdir()
+
+            root_pyproject = root / "pyproject.toml"
+            root_pyproject.touch()
+            src_pyproject = src_dir / "pyproject.toml"
+            src_pyproject.touch()
+            src_python = src_dir / "foo.py"
+            src_python.touch()
+
+            self.assertEqual(
+                black.find_project_root((src_dir, test_dir)), root.resolve()
+            )
+            self.assertEqual(black.find_project_root((src_dir,)), src_dir.resolve())
+            self.assertEqual(black.find_project_root((src_python,)), src_dir.resolve())
+
 
 class BlackDTestCase(AioHTTPTestCase):
     async def get_application(self) -> web.Application:
 
 class BlackDTestCase(AioHTTPTestCase):
     async def get_application(self) -> web.Application: