Function parse_git_diff_ranges

code_review_graph/changes.py:33–68

Run ``git diff --unified=0`` and extract changed line ranges per file. Args: repo_root: Absolute path to the repository root. base: Git ref to diff against (default: ``HEAD~1``). Returns: Mapping of file paths to lists of ``(start_line, end_line)`` tuples. R

(
    repo_root: str,
    base: str = "HEAD~1",
)

def parse_git_diff_ranges(
    repo_root: str,
    base: str = "HEAD~1",
) -> dict[str, list[tuple[int, int]]]:
    """Run ``git diff --unified=0`` and extract changed line ranges per file.

    Args:
        repo_root: Absolute path to the repository root.
        base: Git ref to diff against (default: ``HEAD~1``).

    Returns:
        Mapping of file paths to lists of ``(start_line, end_line)`` tuples.
        Returns an empty dict on error.
    """
    if not _SAFE_GIT_REF.match(base):
        logger.warning("Invalid git ref rejected: %s", base)
        return {}
    try:
        result = subprocess.run(
            ["git", "diff", "--unified=0", base, "--"],
            capture_output=True,
            stdin=subprocess.DEVNULL,
            text=True,
            encoding="utf-8",
            errors="replace",
            cwd=repo_root,
            timeout=_GIT_TIMEOUT,
        )
        if result.returncode != 0:
            logger.warning("git diff failed (rc=%d): %s", result.returncode, result.stderr[:200])
            return {}
    except (OSError, subprocess.SubprocessError) as exc:
        logger.warning("git diff error: %s", exc)
        return {}

    return _parse_unified_diff(result.stdout)


def parse_svn_diff_ranges(