tools/linter/adapters/actionlint_linter.py

import argparse
import os
import re
import json
import logging
import subprocess
import time
from enum import Enum
from typing import List, NamedTuple, Optional, Pattern


LINTER_CODE = "ACTIONLINT"


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]


RESULTS_RE: Pattern[str] = re.compile(
    r"""(?mx)
    ^
    (?P<file>.*?):
    (?P<line>\d+):
    (?P<char>\d+):
    \s(?P<message>.*)
    \s(?P<code>\[.*\])
    $
    """
)


def run_command(
    args: List[str],
) -> "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)


def check_files(
    binary: str,
    files: List[str],
) -> List[LintMessage]:
    try:
        proc = run_command([binary] + files)
    except OSError as err:
        return [
            LintMessage(
                path=None,
                line=None,
                char=None,
                code=LINTER_CODE,
                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["char"]),
            code=LINTER_CODE,
            severity=LintSeverity.ERROR,
            original=None,
            replacement=None,
        )
        for match in RESULTS_RE.finditer(stdout)
    ]


if __name__ == "__main__":
    parser = argparse.ArgumentParser(
        description="actionlint runner",
        fromfile_prefix_chars="@",
    )
    parser.add_argument(
        "--binary",
        required=True,
        help="actionlint binary path",
    )
    parser.add_argument(
        "filenames",
        nargs="+",
        help="paths to lint",
    )

    args = parser.parse_args()

    if not os.path.exists(args.binary):
        err_msg = LintMessage(
            path="<none>",
            line=None,
            char=None,
            code=LINTER_CODE,
            severity=LintSeverity.ERROR,
            name="command-failed",
            original=None,
            replacement=None,
            description=(
                f"Could not find actionlint binary at {args.binary},"
                " you may need to run `lintrunner init`."
            ),
        )
        print(json.dumps(err_msg._asdict()), flush=True)
        exit(0)

    lint_messages = check_files(args.binary, args.filenames)
    for lint_message in lint_messages:
        print(json.dumps(lint_message._asdict()), flush=True)