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files.py
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files.py
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from functools import lru_cache
import io
import os
from pathlib import Path
import sys
from typing import (
Any,
Dict,
Iterable,
Iterator,
List,
Optional,
Pattern,
Sequence,
Tuple,
Union,
TYPE_CHECKING,
)
from pathspec import PathSpec
from pathspec.patterns.gitwildmatch import GitWildMatchPatternError
import tomli
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]) -> Path:
"""Return a directory containing .git, .hg, or pyproject.toml.
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 not srcs:
srcs = [str(Path.cwd().resolve())]
path_srcs = [Path(Path.cwd(), 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 / ".hg").is_dir():
return directory
if (directory / "pyproject.toml").is_file():
return directory
return directory
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 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
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
"""
with open(path_config, encoding="utf8") as f:
pyproject_toml = tomli.load(f) # type: ignore # due to deprecated API usage
config = pyproject_toml.get("tool", {}).get("black", {})
return {k.replace("--", "").replace("-", "_"): v for k, v in config.items()}
@lru_cache()
def find_user_pyproject_toml() -> Path:
r"""Return the path to the top-level user configuration for black.
This looks for ~\.black on Windows and ~/.config/black on Linux and other
Unix systems.
"""
if sys.platform == "win32":
# Windows
user_config_path = Path.home() / ".black"
else:
config_root = os.environ.get("XDG_CONFIG_HOME", "~/.config")
user_config_path = Path(config_root).expanduser() / "black"
return user_config_path.resolve()
@lru_cache()
def get_gitignore(root: Path) -> PathSpec:
"""Return a PathSpec matching gitignore content if present."""
gitignore = root / ".gitignore"
lines: List[str] = []
if gitignore.is_file():
with gitignore.open(encoding="utf-8") as gf:
lines = gf.readlines()
try:
return PathSpec.from_lines("gitwildmatch", lines)
except GitWildMatchPatternError as e:
err(f"Could not parse {gitignore}: {e}")
raise
def normalize_path_maybe_ignore(
path: Path, root: Path, report: Report
) -> Optional[str]:
"""Normalize `path`. May return `None` if `path` was ignored.
`report` is where "path ignored" output goes.
"""
try:
abspath = path if path.is_absolute() else Path.cwd() / path
normalized_path = abspath.resolve().relative_to(root).as_posix()
except OSError as e:
report.path_ignored(path, f"cannot be read because {e}")
return None
except ValueError:
if path.is_symlink():
report.path_ignored(path, f"is a symbolic link that points outside {root}")
return None
raise
return normalized_path
def path_is_excluded(
normalized_path: str,
pattern: Optional[Pattern[str]],
) -> bool:
match = pattern.search(normalized_path) if pattern else None
return bool(match and match.group(0))
def gen_python_files(
paths: Iterable[Path],
root: Path,
include: Pattern[str],
exclude: Pattern[str],
extend_exclude: Optional[Pattern[str]],
force_exclude: Optional[Pattern[str]],
report: Report,
gitignore: Optional[PathSpec],
*,
verbose: bool,
quiet: bool,
) -> Iterator[Path]:
"""Generate all files under `path` whose paths are not excluded by the
`exclude_regex`, `extend_exclude`, or `force_exclude` regexes,
but are included by the `include` regex.
Symbolic links pointing outside of the `root` directory are ignored.
`report` is where output about exclusions goes.
"""
assert root.is_absolute(), f"INTERNAL ERROR: `root` must be absolute but is {root}"
for child in paths:
normalized_path = normalize_path_maybe_ignore(child, root, report)
if normalized_path is None:
continue
# First ignore files matching .gitignore, if passed
if gitignore is not None and gitignore.match_file(normalized_path):
report.path_ignored(child, "matches the .gitignore file content")
continue
# Then ignore with `--exclude` `--extend-exclude` and `--force-exclude` options.
normalized_path = "/" + normalized_path
if child.is_dir():
normalized_path += "/"
if path_is_excluded(normalized_path, exclude):
report.path_ignored(child, "matches the --exclude regular expression")
continue
if path_is_excluded(normalized_path, extend_exclude):
report.path_ignored(
child, "matches the --extend-exclude regular expression"
)
continue
if path_is_excluded(normalized_path, force_exclude):
report.path_ignored(child, "matches the --force-exclude regular expression")
continue
if child.is_dir():
# If gitignore is None, gitignore usage is disabled, while a Falsey
# gitignore is when the directory doesn't have a .gitignore file.
yield from gen_python_files(
child.iterdir(),
root,
include,
exclude,
extend_exclude,
force_exclude,
report,
gitignore + get_gitignore(child) if gitignore is not None else None,
verbose=verbose,
quiet=quiet,
)
elif child.is_file():
if child.suffix == ".ipynb" and not jupyter_dependencies_are_installed(
verbose=verbose, quiet=quiet
):
continue
include_match = include.search(normalized_path) if include else True
if include_match:
yield child
def wrap_stream_for_windows(
f: io.TextIOWrapper,
) -> Union[io.TextIOWrapper, "colorama.AnsiToWin32"]:
"""
Wrap stream with colorama's wrap_stream so colors are shown on Windows.
If `colorama` is unavailable, the original stream is returned unmodified.
Otherwise, the `wrap_stream()` function determines whether the stream needs
to be wrapped for a Windows environment and will accordingly either return
an `AnsiToWin32` wrapper or the original stream.
"""
try:
from colorama.initialise import wrap_stream
except ImportError:
return f
else:
# Set `strip=False` to avoid needing to modify test_express_diff_with_color.
return wrap_stream(f, convert=None, strip=False, autoreset=False, wrap=True)