Add pycrdt.__version__ (#223)

* Add pycrdt.__version__

* Fix typing

* Fix coverage

* Fix typing

pyproject.toml

@@ -32,6 +32,7 @@ classifiers = [
 
 dependencies = [
     "anyio >=4.4.0,<5.0.0",
+    "importlib_metadata >=3.6; python_version<'3.10'",
 ]
 
 [project.optional-dependencies]

python/pycrdt/__init__.py

@@ -31,6 +31,7 @@
 from ._update import get_state as get_state
 from ._update import get_update as get_update
 from ._update import merge_updates as merge_updates
+from ._version import __version__ as __version__
 from ._xml import XmlElement as XmlElement
 from ._xml import XmlEvent as XmlEvent
 from ._xml import XmlFragment as XmlFragment

python/pycrdt/_version.py

@@ -0,0 +1,12 @@
+try:
+    from importlib.metadata import PackageNotFoundError, version
+except ImportError:  # pragma: no cover
+    from importlib_metadata import (  # type: ignore[assignment, import-not-found, no-redef]
+        PackageNotFoundError,
+        version,
+    )
+
+try:
+    __version__ = version("pycrdt")
+except PackageNotFoundError:  # pragma: no cover
+    __version__ = "uninstalled"