add noxfile automation and testing

.gitignore

@@ -35,6 +35,7 @@ pip-delete-this-directory.txt
 
 # Unit test / coverage reports
 htmlcov/
+.nox/
 .tox/
 .coverage
 .cache

gflex/__main__.py

@@ -1,4 +1,4 @@
 from gflex.gflex import main
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     raise SystemExit(main())

noxfile.py

@@ -0,0 +1,96 @@
+import pathlib
+import shutil
+
+import nox
+
+PYTHON_VERSION = "3.12"
+ROOT = pathlib.Path(__file__).parent
+
+
+@nox.session(python=PYTHON_VERSION, venv_backend="conda")
+def test(session: nox.Session) -> None:
+    """Run the tests."""
+    session.install("-e", ".[testing]")
+    session.run("pytest", "-vvv")
+
+
+@nox.session(name="test-cli", python=PYTHON_VERSION, venv_backend="conda")
+def test_cli(session: nox.Session) -> None:
+    """Test the command line interface."""
+    session.install(".")
+    session.run("gflex", "--help")
+    session.run("gflex", "--version")
+
+
+@nox.session
+def lint(session: nox.Session) -> None:
+    """Look for lint."""
+    session.install("pre-commit")
+    session.run("pre-commit", "run", "--all-files")
+
+
+@nox.session
+def build(session: nox.Session) -> None:
+    """Build sdist and wheel dists."""
+    session.install("pip")
+    session.install("build")
+    session.run("python", "--version")
+    session.run("pip", "--version")
+    session.run("python", "-m", "build", "--outdir", "./build/wheelhouse")
+
+
+@nox.session(name="publish-testpypi")
+def publish_testpypi(session):
+    """Publish wheelhouse/* to TestPyPI."""
+    session.run("twine", "check", "build/wheelhouse/*")
+    session.run(
+        "twine",
+        "upload",
+        "--skip-existing",
+        "--repository-url",
+        "https://test.pypi.org/legacy/",
+        "build/wheelhouse/*.tar.gz",
+    )
+
+
+@nox.session(name="publish-pypi")
+def publish_pypi(session):
+    """Publish wheelhouse/* to PyPI."""
+    session.run("twine", "check", "build/wheelhouse/*")
+    session.run(
+        "twine",
+        "upload",
+        "--skip-existing",
+        "build/wheelhouse/*.tar.gz",
+    )
+
+
+@nox.session(python=False)
+def clean(session):
+    """Remove all .venv's, build files and caches in the directory."""
+    for folder in _args_to_folders(session.posargs):
+        with session.chdir(folder):
+            shutil.rmtree("build", ignore_errors=True)
+            shutil.rmtree("build/wheelhouse", ignore_errors=True)
+            shutil.rmtree("gflex.egg-info", ignore_errors=True)
+            shutil.rmtree(".pytest_cache", ignore_errors=True)
+            shutil.rmtree(".venv", ignore_errors=True)
+
+            for pattern in ["*.py[co]", "__pycache__"]:
+                _clean_rglob(pattern)
+
+
+def _args_to_folders(args):
+    return [ROOT] if not args else [pathlib.Path(f) for f in args]
+
+
+def _clean_rglob(pattern):
+    nox_dir = pathlib.Path(".nox")
+
+    for p in pathlib.Path(".").rglob(pattern):
+        if nox_dir in p.parents:
+            continue
+        if p.is_dir():
+            p.rmdir()
+        else:
+            p.unlink()