Improve getting __version__

hyperspy_gui_ipywidgets/__init__.py

@@ -18,19 +18,33 @@
 
 
 import importlib
+from importlib.metadata import version
 from pathlib import Path
 
 
-if Path(__file__).parent.parent.name == "site-packages":  # pragma: no cover
-    # Tested in the "Package & Test" workflow on GitHub CI
-    from importlib.metadata import version
+__version__ = version("rosettasciio")
 
-    __version__ = version("hyperspy_gui_ipywidgets")
-else:
-    # Editable install
-    from setuptools_scm import get_version
+# For development version, `setuptools_scm` will be used at build time
+# to get the dev version, in case of missing vcs information (git archive,
+# shallow repository), the fallback version defined in pyproject.toml will
+# be used
 
-    __version__ = get_version(Path(__file__).parent.parent)
+# if we have a editable install from a git repository try to use
+# `setuptools_scm` to find a more accurate version:
+# `importlib.metadata` will provide the version at installation
+# time and for editable version this may be different
+
+# we only do that if we have enough git history, e.g. not shallow checkout
+_root = Path(__file__).resolve().parents[1]
+if (_root / ".git").exists() and not (_root / ".git/shallow").exists():
+    try:
+        # setuptools_scm may not be installed
+        from setuptools_scm import get_version
+
+        __version__ = get_version(_root)
+    except ImportError:  # pragma: no cover
+        # setuptools_scm not install, we keep the existing __version__
+        pass
 
 
 __all__ = [
@@ -49,11 +63,11 @@ def __dir__():
 
 
 def __getattr__(name):
+    # lazy loading of module: this is only call when the attribute "name" is not found
+    # in the module
+    # See https://peps.python.org/pep-0562/
     if name in __all__:
-        if name == "__version__":
-            return __version__
-        else:
-            return importlib.import_module(
-                "." + name, 'hyperspy_gui_ipywidgets'
-                )
+        return importlib.import_module(
+            "." + name, 'hyperspy_gui_ipywidgets'
+            )
     raise AttributeError(f"module {__name__!r} has no attribute {name!r}")