noxfile.py

"""Nox sessions."""

import sys
from pathlib import Path
from textwrap import dedent

import nox

if sys.version_info >= (3, 11):
    import tomllib
else:
    import tomli as tomllib


try:
    from nox_poetry import session
except ImportError:
    message = f"""\
    Nox failed to import the 'nox-poetry' package.

    Please install it using the following command:

    {sys.executable} -m pip install nox-poetry"""
    raise SystemExit(dedent(message)) from None


package = "countdown"
config = tomllib.loads(Path("pyproject.toml").read_text())
python_versions = [
    classifier.split()[-1]
    for classifier in config["tool"]["poetry"]["classifiers"]
    if classifier.startswith("Programming Language :: Python :: ")
]
nox.needs_version = ">= 2021.6.6"
nox.options.sessions = ("pre-commit", "tests")


def activate_virtualenv_in_precommit_hooks(session) -> None:
    """Activate virtualenv in hooks installed by pre-commit.

    This function patches git hooks installed by pre-commit to activate the
    session's virtual environment. This allows pre-commit to locate hooks in
    that environment when invoked from git.

    Args:
        session: The Session object.
    """
    assert session.bin is not None  # noqa: S101

    virtualenv = session.env.get("VIRTUAL_ENV")
    if virtualenv is None:
        return

    hookdir = Path(".git") / "hooks"
    if not hookdir.is_dir():
        return

    for hook in hookdir.iterdir():
        if hook.name.endswith(".sample") or not hook.is_file():
            continue

        text = hook.read_text()
        bindir = repr(session.bin)[1:-1]  # strip quotes
        if not (
            Path("A") == Path("a") and bindir.lower() in text.lower() or bindir in text
        ):
            continue

        lines = text.splitlines()
        if not (lines[0].startswith("#!") and "python" in lines[0].lower()):
            continue

        header = dedent(
            f"""\
            import os
            os.environ["VIRTUAL_ENV"] = {virtualenv!r}
            os.environ["PATH"] = os.pathsep.join((
                {session.bin!r},
                os.environ.get("PATH", ""),
            ))
            """
        )

        lines.insert(1, header)
        hook.write_text("\n".join(lines))


@session(name="pre-commit", python="3.10")
def precommit(session):
    """Lint using pre-commit."""
    args = session.posargs or ["run", "--all-files", "--show-diff-on-failure"]
    session.install(
        "black",
        "flake8",
        "flake8-bandit",
        "flake8-bugbear",
        "flake8-docstrings",
        "flake8-rst-docstrings",
        "pep8-naming",
        "pre-commit",
        "pre-commit-hooks",
        "reorder-python-imports",
    )
    session.run("pre-commit", *args)
    if args and args[0] == "install":
        activate_virtualenv_in_precommit_hooks(session)


@session(python=python_versions)
def tests(session):
    """Run the test suite."""
    session.install(".")
    session.install("coverage[toml]", "pytest", "pygments")
    try:
        session.run("coverage", "run", "--parallel", "-m", "pytest", *session.posargs)
    finally:
        if session.interactive:
            session.notify("coverage", posargs=[])


@session
def coverage(session):
    """Produce the coverage report."""
    args = session.posargs or ["report"]

    session.install("coverage[toml]")

    if not session.posargs and any(Path().glob(".coverage.*")):
        session.run("coverage", "combine")

    session.run("coverage", *args)