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import argparse
import json
import logging
import os
import re
import subprocess
import sys
import time
from enum import Enum
from pathlib import Path
from typing import Any, Dict, List, NamedTuple, Optional, Pattern
IS_WINDOWS: bool = os.name == "nt"
def eprint(*args: Any, **kwargs: Any) -> None:
print(*args, file=sys.stderr, flush=True, **kwargs)
class LintSeverity(str, Enum):
ERROR = "error"
WARNING = "warning"
ADVICE = "advice"
DISABLED = "disabled"
class LintMessage(NamedTuple):
path: Optional[str]
line: Optional[int]
char: Optional[int]
code: str
severity: LintSeverity
name: str
original: Optional[str]
replacement: Optional[str]
description: Optional[str]
def as_posix(name: str) -> str:
return name.replace("\\", "/") if IS_WINDOWS else name
# tools/linter/flake8_linter.py:15:13: error: Incompatibl...int") [assignment]
RESULTS_RE: Pattern[str] = re.compile(
r"""(?mx)
^
(?P<file>.*?):
(?P<line>\d+):
(?:(?P<column>-?\d+):)?
\s(?P<severity>\S+?):?
\s(?P<message>.*)
\s(?P<code>\[.*\])
$
"""
)
def run_command(
args: List[str],
*,
extra_env: Optional[Dict[str, str]],
retries: int,
) -> "subprocess.CompletedProcess[bytes]":
logging.debug("$ %s", " ".join(args))
start_time = time.monotonic()
try:
return subprocess.run(
args,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
)
finally:
end_time = time.monotonic()
logging.debug("took %dms", (end_time - start_time) * 1000)
# Severity is either "error" or "note":
# https://github.com/python/mypy/blob/8b47a032e1317fb8e3f9a818005a6b63e9bf0311/mypy/errors.py#L46-L47
severities = {
"error": LintSeverity.ERROR,
"note": LintSeverity.ADVICE,
}
def check_files(
filenames: List[str],
config: str,
retries: int,
) -> List[LintMessage]:
try:
proc = run_command(
[sys.executable, "-mmypy", f"--config={config}"] + filenames,
extra_env={},
retries=retries,
)
except OSError as err:
return [
LintMessage(
path=None,
line=None,
char=None,
code="MYPY",
severity=LintSeverity.ERROR,
name="command-failed",
original=None,
replacement=None,
description=(f"Failed due to {err.__class__.__name__}:\n{err}"),
)
]
stdout = str(proc.stdout, "utf-8").strip()
return [
LintMessage(
path=match["file"],
name=match["code"],
description=match["message"],
line=int(match["line"]),
char=int(match["column"])
if match["column"] is not None and not match["column"].startswith("-")
else None,
code="MYPY",
severity=severities.get(match["severity"], LintSeverity.ERROR),
original=None,
replacement=None,
)
for match in RESULTS_RE.finditer(stdout)
]
def main() -> None:
parser = argparse.ArgumentParser(
description="mypy wrapper linter.",
fromfile_prefix_chars="@",
)
parser.add_argument(
"--retries",
default=3,
type=int,
help="times to retry timed out mypy",
)
parser.add_argument(
"--config",
required=True,
help="path to an mypy .ini config file",
)
parser.add_argument(
"--verbose",
action="store_true",
help="verbose logging",
)
parser.add_argument(
"filenames",
nargs="+",
help="paths to lint",
)
args = parser.parse_args()
logging.basicConfig(
format="<%(threadName)s:%(levelname)s> %(message)s",
level=logging.NOTSET
if args.verbose
else logging.DEBUG
if len(args.filenames) < 1000
else logging.INFO,
stream=sys.stderr,
)
# Use a dictionary here to preserve order. mypy cares about order,
# tragically, e.g. https://github.com/python/mypy/issues/2015
filenames: Dict[str, bool] = {}
# If a stub file exists, have mypy check it instead of the original file, in
# accordance with PEP-484 (see https://www.python.org/dev/peps/pep-0484/#stub-files)
for filename in args.filenames:
if filename.endswith(".pyi"):
filenames[filename] = True
continue
stub_filename = filename.replace(".py", ".pyi")
if Path(stub_filename).exists():
filenames[stub_filename] = True
else:
filenames[filename] = True
lint_messages = check_files(list(filenames), args.config, args.retries)
for lint_message in lint_messages:
print(json.dumps(lint_message._asdict()), flush=True)
if __name__ == "__main__":
main()
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