Use verioneer for tagging (Fix ome#154)

Move to the use of https://github.com/python-versioneer/python-versioneer
for defining a version from the current tag. This also removes the need
to use bump2version, therefore releases can be handled completely from
the GH UI.

.gitattributes

@@ -0,0 +1 @@
+src/omero_zarr/_version.py export-subst

.gitignore

@@ -5,4 +5,3 @@ venv/
 build/
 dist/
 __pycache__
-src/omero_zarr/_version.py

setup.cfg

@@ -0,0 +1,7 @@
+[versioneer]
+VCS = git
+style = pep440
+versionfile_source = src/omero_zarr/_version.py
+versionfile_build =
+tag_prefix = v
+parentdir_prefix = src/omero_zarr/

setup.py

@@ -20,6 +20,8 @@
 
 from setuptools import setup
 
+import versioneer
+
 
 def get_long_description() -> str:
     here = os.path.abspath(os.path.dirname(__file__))
@@ -29,10 +31,12 @@ def get_long_description() -> str:
 
 
 long_description = get_long_description()
+version = versioneer.get_version()
 
 setup(
     name="omero-cli-zarr",
-    version="9.9.9",
+    version=version,
+    cmdclass=versioneer.get_cmdclass(),
     packages=["omero_zarr", "omero.plugins"],
     package_dir={"": "src"},
     description="Plugin for exporting images in zarr format.",
@@ -55,6 +59,4 @@ def get_long_description() -> str:
     long_description=long_description,
     keywords=["OMERO.CLI", "plugin"],
     url="https://github.com/ome/omero-cli-zarr/",
-    setup_requires=["setuptools_scm"],
-    use_scm_version={"write_to": "src/omero_zarr/_version.py"},
 )

src/omero_zarr/__init__.py

@@ -18,10 +18,13 @@
 
 from ome_zarr.format import CurrentFormat
 
-from ._version import version as __version__
+from . import _version
 
 ngff_version = CurrentFormat().version
 
 __all__ = [
     "__version__",
 ]
+
+
+__version__ = _version.get_versions()["version"]