switch to using setuptools_scm to get version

also turn off local_scheme because we're testing uploads to TestPyPI,
and pypi does not support it.

Author: wnienhaus

.github/workflows/publish.yml

@@ -19,7 +19,7 @@ jobs:
         python-version: '3.x'
     - name: Install dependencies
       run: |
-        pip install setuptools
+        pip install setuptools setuptools_scm
     - name: Build package
       env:
         VERSION: ${{ github.event.release.tag_name }}

setup.py

@@ -1,6 +1,4 @@
-import os
 import re
-import subprocess
 
 import sdist_upip
 from setuptools import setup
@@ -19,17 +17,11 @@ def long_desc_from_readme():
         return long_description
 
 
-def get_version():
-    version = os.environ.get('VERSION', None)
-    if not version:
-        version = subprocess.check_output(['git', 'describe', '--always', '--tags', '--dirty'])
-        version = str(version, 'utf-8').strip()
-    return version
-
-
 setup(
     name="micropython-py-esp32-ulp",
-    version=get_version(),
+    use_scm_version={
+        'local_scheme': 'no-local-version',
+    },
     description="Assembler toolchain for the ESP32 ULP co-processor, written in MicroPython",
     long_description=long_desc_from_readme(),
     long_description_content_type='text/x-rst',
@@ -43,6 +35,7 @@ def get_version():
         'License :: OSI Approved :: MIT License',
         'Programming Language :: Python :: Implementation :: MicroPython',
     ],
+    setup_requires=['setuptools_scm'],
     platforms=["esp32", "linux", "darwin"],
     cmdclass={"sdist": sdist_upip.sdist},
     packages=["esp32_ulp"],