# Buggy code
def __init__(
    self, raw: str, allow_short_req_file: bool = True, root: Optional[Path] = None
) -> None:
    self._root = Path().cwd() if root is None else root
    if allow_short_req_file:  # patch for tox<4 supporting requirement/constraint files via -rreq.txt/-creq.txt
        lines: List[str] = []
        for line in raw.splitlines():
            if (
                len(line) >= 3
                and (line.startswith("-r") or line.startswith("-c"))
                and not line[2].isspace()
            ):
                line = f"{line[:2]} {line[2:]}"
            lines.append(line)
        adjusted = "\n".join(lines)
        raw = (
            f"{adjusted}\n" if raw.endswith("\\\n") else adjusted
        )  # preserve trailing newline if input has it
    self._raw = raw


# Traceback (ValueError)
Traceback (most recent call last):
File "/home/domdf/Python/01 GitHub Repos/03 Libraries/wordle/venv/lib/python3.8/site-packages/tox/session/cmd/run/single.py", line 41, in _evaluate
tox_env.ensure_setup(recreate=recreate)
File "/home/domdf/Python/01 GitHub Repos/03 Libraries/wordle/venv/lib/python3.8/site-packages/tox/tox_env/api.py", line 169, in ensure_setup
self.setup()
File "/home/domdf/Python/01 GitHub Repos/03 Libraries/wordle/venv/lib/python3.8/site-packages/tox/tox_env/python/runner.py", line 44, in setup
self.install_deps()
File "/home/domdf/Python/01 GitHub Repos/03 Libraries/wordle/venv/lib/python3.8/site-packages/tox/tox_env/python/runner.py", line 68, in install_deps
requirement_file_content = requirements_file.validate_and_expand()
File "/home/domdf/Python/01 GitHub Repos/03 Libraries/wordle/venv/lib/python3.8/site-packages/tox/tox_env/python/req_file.py", line 94, in validate_and_expand
raise ValueError(line)
ValueError: -r /home/domdf/Python/01 GitHub Repos/03 Libraries/wordle/tests/requirements.txt
py36: FAIL ✖ in 0.42 seconds
py36: FAIL code 2 (0.42 seconds)
evaluation failed :( (0.49 seconds)

# Fixed code
def __init__(
    self, raw: str, within_tox_ini: bool = True, root: Optional[Path] = None
) -> None:
    self._root = Path().cwd() if root is None else root
    if within_tox_ini:  # patch the content coming from tox.ini
        lines: List[str] = []
        for line in raw.splitlines():
            # for tox<4 supporting requirement/constraint files via -rreq.txt/-creq.txt
            if (
                len(line) >= 3
                and (line.startswith("-r") or line.startswith("-c"))
                and not line[2].isspace()
            ):
                line = f"{line[:2]} {line[2:]}"
            # escape spaces
            escape_for = (
                "-c",
                "--constraint",
                "-r",
                "--requirement",
                "-f",
                "--find-links-e",
                "--editable",
            )
            escape_match = next(
                (
                    e
                    for e in escape_for
                    if line.startswith(e) and line[len(e)].isspace()
                ),
                None,
            )
            if escape_match is not None:
                # escape not already escaped spaces
                escaped = re.sub(r"(?<!\\)(\s)", r"\\\1", line[len(escape_match) + 1 :])
                line = f"{line[: len(escape_match)]} {escaped}"
            lines.append(line)
        adjusted = "\n".join(lines)
        raw = (
            f"{adjusted}\n" if raw.endswith("\\\n") else adjusted
        )  # preserve trailing newline if input has it
    self._raw = raw