Add option to skip the first line of source code (#3299)

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

diff --git a/src/black/files.py b/src/black/files.py
index 18c84237bf0ecee74221ca48c25bc62fb995c41b..ed503f5fec79bc69d693a9d1c72d82254304b782 100644 (file)
--- a/src/black/files.py
+++ b/src/black/files.py
@@ -1,9 +1,10 @@
-from functools import lru_cache
 import io
 import os
-from pathlib import Path
 import sys
+from functools import lru_cache
+from pathlib import Path
 from typing import (
+    TYPE_CHECKING,
     Any,
     Dict,
     Iterable,
@@ -14,24 +15,34 @@ from typing import (
     Sequence,
     Tuple,
     Union,
-    TYPE_CHECKING,
 )
 
 from mypy_extensions import mypyc_attr
 from pathspec import PathSpec
 from pathspec.patterns.gitwildmatch import GitWildMatchPatternError
-import tomli
 
+if sys.version_info >= (3, 11):
+    try:
+        import tomllib
+    except ImportError:
+        # Help users on older alphas
+        if not TYPE_CHECKING:
+            import tomli as tomllib
+else:
+    import tomli as tomllib
+
+from black.handle_ipynb_magics import jupyter_dependencies_are_installed
 from black.output import err
 from black.report import Report
-from black.handle_ipynb_magics import jupyter_dependencies_are_installed
 
 if TYPE_CHECKING:
     import colorama  # noqa: F401
 
 
 @lru_cache()
-def find_project_root(srcs: Sequence[str]) -> Tuple[Path, str]:
+def find_project_root(
+    srcs: Sequence[str], stdin_filename: Optional[str] = None
+) -> Tuple[Path, str]:
     """Return a directory containing .git, .hg, or pyproject.toml.
 
     That directory will be a common parent of all files and directories
@@ -44,6 +55,8 @@ def find_project_root(srcs: Sequence[str]) -> Tuple[Path, str]:
     the second element as a string describing the method by which the
     project root was discovered.
     """
+    if stdin_filename is not None:
+        srcs = tuple(stdin_filename if s == "-" else s for s in srcs)
     if not srcs:
         srcs = [str(Path.cwd().resolve())]
 
@@ -87,7 +100,7 @@ def find_pyproject_toml(path_search_start: Tuple[str, ...]) -> Optional[str]:
             if path_user_pyproject_toml.is_file()
             else None
         )
-    except PermissionError as e:
+    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
@@ -97,10 +110,10 @@ def find_pyproject_toml(path_search_start: Tuple[str, ...]) -> Optional[str]:
 def parse_pyproject_toml(path_config: str) -> Dict[str, Any]:
     """Parse a pyproject toml file, pulling out relevant parts for Black
 
-    If parsing fails, will raise a tomli.TOMLDecodeError
+    If parsing fails, will raise a tomllib.TOMLDecodeError
     """
     with open(path_config, "rb") as f:
-        pyproject_toml = tomli.load(f)
+        pyproject_toml = tomllib.load(f)
     config = pyproject_toml.get("tool", {}).get("black", {})
     return {k.replace("--", "").replace("-", "_"): v for k, v in config.items()}
 
@@ -111,6 +124,10 @@ def find_user_pyproject_toml() -> Path:
 
     This looks for ~\.black on Windows and ~/.config/black on Linux and other
     Unix systems.
+
+    May raise:
+    - RuntimeError: if the current user has no homedir
+    - PermissionError: if the current process cannot access the user's homedir
     """
     if sys.platform == "win32":
         # Windows
@@ -147,23 +164,22 @@ def normalize_path_maybe_ignore(
     """
     try:
         abspath = path if path.is_absolute() else Path.cwd() / path
-        normalized_path = abspath.resolve().relative_to(root).as_posix()
-    except OSError as e:
-        if report:
-            report.path_ignored(path, f"cannot be read because {e}")
-        return None
-
-    except ValueError:
-        if path.is_symlink():
+        normalized_path = abspath.resolve()
+        try:
+            root_relative_path = normalized_path.relative_to(root).as_posix()
+        except ValueError:
             if report:
                 report.path_ignored(
                     path, f"is a symbolic link that points outside {root}"
                 )
             return None
 
-        raise
+    except OSError as e:
+        if report:
+            report.path_ignored(path, f"cannot be read because {e}")
+        return None
 
-    return normalized_path
+    return root_relative_path
 
 
 def path_is_excluded(