build: add optional_dependencies (#8)

Signed-off-by: nstarman <[email protected]>

conftest.py

@@ -2,11 +2,12 @@
 
 import platform
 from doctest import ELLIPSIS, NORMALIZE_WHITESPACE
-from importlib.util import find_spec
 
 from sybil import Sybil
 from sybil.parsers.rest import DocTestParser, PythonCodeBlockParser, SkipParser
 
+from optional_dependencies import OptionalDependencyEnum, auto
+
 # TODO: stop skipping doctests on Windows when there is uniform support for
 #       numpy 2.0+ scalar repr. On windows it is printed as 1.0 instead of
 #       `np.float64(1.0)`.
@@ -25,12 +26,15 @@
 ).pytest()
 
 
-# TODO: via separate optional_deps package
-HAS_ASTROPY = find_spec("astropy") is not None
-HAS_GALA = find_spec("gala") is not None
+class OptDeps(OptionalDependencyEnum):  # type: ignore[misc]  # pylint: disable=invalid-enum-extension
+    """Optional dependencies for ``is_annotated``."""
+
+    ASTROPY = auto()
+    GALA = auto()
+
 
 collect_ignore_glob = []
-if not HAS_ASTROPY:
+if not OptDeps.ASTROPY.installed:
     collect_ignore_glob.append("src/unxt/_interop/unxt_interop_astropy/*")
-if not HAS_GALA:
+if not OptDeps.GALA.installed:
     collect_ignore_glob.append("src/unxt/_interop/unxt_interop_gala/*")

pyproject.toml

@@ -35,6 +35,7 @@
   [project.optional-dependencies]
     dev = ["is_annotated[test]"]
     test = [
+      "optional_dependencies >= 0.3",
       "pytest >=6",
       "pytest-cov >=3",
       "pytest-github-actions-annotate-failures",
@@ -109,6 +110,12 @@
       "noxfile.py" = ["T20"]
       "tests/**"   = ["ANN", "INP001", "S101", "T20"]
 
+    [tool.ruff.lint.isort]
+      combine-as-imports = true
+      extra-standard-library = ["typing_extensions"]
+      known-first-party = ["optional_dependencies"]
+      known-local-folder = ["is_annotated"]
+
 
 [tool.pylint]
   ignore-paths = [".*/_version.py"]

src/is_annotated/__init__.py

@@ -6,7 +6,6 @@
 __all__ = ["isannotated"]
 
 from typing import Annotated
-
 from typing_extensions import TypeGuard, _AnnotatedAlias
 
 AnnotationType = type(Annotated[int, "_"])