Move _package_version to travertino

changes/3183.misc.rst

@@ -0,0 +1 @@
+Move ``_package_version`` to travertino

core/src/toga/__init__.py

@@ -11,6 +11,8 @@
 import warnings
 from importlib import import_module
 
+from travertino import _package_version
+
 toga_core_imports = {
     # toga.app imports
     "App": "toga.app",
@@ -119,28 +121,4 @@ def warn(cls, platform: str, feature: str) -> None:
         warnings.warn(NotImplementedWarning(f"[{platform}] Not implemented: {feature}"))
 
 
-def _package_version(file, name):
-    try:
-        # Read version from SCM metadata
-        # This will only exist in a development environment
-        from setuptools_scm import get_version
-
-        # Excluded from coverage because a pure test environment (such as the one
-        # used by tox in CI) won't have setuptools_scm
-        return get_version(root="../../..", relative_to=file)  # pragma: no cover
-    except (
-        ModuleNotFoundError,
-        LookupError,
-    ):  # pragma: no-cover-if-missing-setuptools_scm
-        # If setuptools_scm isn't in the environment, the call to import will fail.
-        # If it *is* in the environment, but the code isn't a git checkout (e.g.,
-        # it's been pip installed non-editable) the call to get_version() will fail.
-        # If either of these occurs, read version from the installer metadata.
-        import importlib.metadata
-
-        # The Toga package names as defined in setup.cfg all use dashes.
-        package = "toga-core" if name == "toga" else name.replace("_", "-")
-        return importlib.metadata.version(package)
-
-
 __version__ = _package_version(__file__, __name__)

travertino/src/travertino/__init__.py

@@ -1,17 +1,25 @@
-try:
-    # Read version from SCM metadata
-    # This will only exist in a development environment
-    from setuptools_scm import get_version
+def _package_version(file, name):
+    try:
+        # Read version from SCM metadata
+        # This will only exist in a development environment
+        from setuptools_scm import get_version
 
-    # Excluded from coverage because a pure test environment (such as the one
-    # used by tox in CI) won't have setuptools_scm
-    __version__ = get_version("../../..", relative_to=__file__)  # pragma: no cover
-except (ModuleNotFoundError, LookupError):
-    # If setuptools_scm isn't in the environment, the call to import will fail.
-    # If it *is* in the environment, but the code isn't a git checkout (e.g.,
-    # it's been pip installed non-editable) the call to get_version() will fail.
-    # If either of these occurs, read version from the installer metadata.
+        # Excluded from coverage because a pure test environment (such as the one
+        # used by tox in CI) won't have setuptools_scm
+        return get_version(root="../../..", relative_to=file)  # pragma: no cover
+    except (
+        ModuleNotFoundError,
+        LookupError,
+    ):  # pragma: no-cover-if-missing-setuptools_scm
+        # If setuptools_scm isn't in the environment, the call to import will fail.
+        # If it *is* in the environment, but the code isn't a git checkout (e.g.,
+        # it's been pip installed non-editable) the call to get_version() will fail.
+        # If either of these occurs, read version from the installer metadata.
+        import importlib.metadata
 
-    from importlib.metadata import version
+        # The Toga package names as defined in pyproject.toml all use dashes.
+        package = "toga-core" if name == "toga" else name.replace("_", "-")
+        return importlib.metadata.version(package)
 
-    __version__ = version("travertino")
+
+__version__ = _package_version(__file__, __name__)