Make versioningit write version to file; make setup.py read version as fallback

Author: jwodder

.gitignore

@@ -8,3 +8,4 @@ _build/
 build/
 dist/
 .vscode/
+_version.py

heudiconv/__init__.py

@@ -2,13 +2,7 @@
 import logging
 import os
 from .info import __packagename__
-
-try:
-    from importlib.metadata import version
-except ImportError:
-    from importlib_metadata import version
-
-__version__ = version(__name__)
+from ._version import __version__
 
 # Rudimentary logging support.
 lgr = logging.getLogger(__name__)

heudiconv/info.py

@@ -28,7 +28,6 @@
     'dcmstack>=0.8',
     'etelemetry',
     'filelock>=3.0.12',
-    'importlib-metadata; python_version < "3.8"',
 ]
 
 TESTS_REQUIRES = [

pyproject.toml

@@ -6,4 +6,5 @@ requires = [
 ]
 build-backend = "setuptools.build_meta"
 
-[tool.versioningit]
+[tool.versioningit.write]
+file = "heudiconv/_version.py"

setup.py

@@ -21,6 +21,17 @@ def main():
     with open(info_file) as infofile:
         exec(infofile.read(), globals(), ldict)
 
+    try:
+        import versioningit
+    except ImportError:
+        # versioningit isn't installed; assume we're building a Debian package
+        # from an sdist on an older Debian that doesn't support pybuild
+        vglobals = {}
+        with open(op.join(op.dirname(__file__), "heudiconv", "_version.py")) as fp:
+            exec(fp.read(), vglobals)
+        kwargs = {"version": vglobals["__version__"]}
+    else:
+        kwargs = {}
 
     def findsome(subdir, extensions):
         """Find files under subdir having specified extensions
@@ -58,7 +69,8 @@ def findsome(subdir, extensions):
                         op.join('data', '*.dcm'),
                         op.join('data', '*', '*.dcm')
             ],
-        }
+        },
+        **kwargs,
     )