Function get_diff_lines

Doc/tools/check-warnings.py:68–100

List the lines changed between two Git refs for a specific file.

(ref_a: str, ref_b: str, file: Path)

def get_diff_lines(ref_a: str, ref_b: str, file: Path) -> list[int]:
    """List the lines changed between two Git refs for a specific file."""
    diff_output = subprocess.run(
        [
            "git",
            "diff",
            "--unified=0",
            f"{ref_a}...{ref_b}",
            "--",
            str(file),
        ],
        stdout=subprocess.PIPE,
        check=True,
        text=True,
        encoding="UTF-8",
    )

    # Scrape line offsets + lengths from diff and convert to line numbers
    line_matches = DIFF_PATTERN.finditer(diff_output.stdout)
    # Removed and added line counts are 1 if not printed
    line_match_values = [
        line_match.groupdict(default=1) for line_match in line_matches
    ]
    line_ints = [
        (int(match_value["lineb"]), int(match_value["added"]))
        for match_value in line_match_values
    ]
    line_ranges = [
        range(line_b, line_b + added) for line_b, added in line_ints
    ]
    line_numbers = list(itertools.chain(*line_ranges))

    return line_numbers


def get_para_line_numbers(file_obj: TextIO) -> list[list[int]]: