Move to setuptools_scm for version output.

Author: mithro

pyproject.toml

@@ -1,2 +1,12 @@
 [build-system]
-requires = ["setuptools", "wheel", "cython"]
+requires = [
+  "cython",
+  "setuptools>=42",
+  "setuptools_scm[toml]>=3.4",
+  "wheel",
+]
+
+[tool.setuptools_scm]
+version_scheme = "post-release"
+write_to = "fasm/version.py"
+tag_regex = "v[0-9.]+"

setup.cfg

@@ -1,5 +1,8 @@
 [metadata]
 license_files = LICENSE
 
-[bdist_wheel]
-universal=1
+[options]
+setup_requires =
+  wheel
+  setuptools
+  setuptools_scm

setup.py

@@ -32,22 +32,18 @@
     long_description = fh.read()
 
 
-# Read in the version information
-FASM_VERSION_FILE = os.path.join(__dir__, 'fasm', 'version.py')
-with open(FASM_VERSION_FILE) as f:
-    if 'UNKNOWN' in f.read():
-        print(
-            "Running update_version.py to generate {}".format(
-                FASM_VERSION_FILE))
-        subprocess.check_call(['python', 'update_version.py'], cwd=__dir__)
-with open(FASM_VERSION_FILE) as f:
-    lines = f.readlines()
-    version_line = [v.strip() for v in lines if v.startswith('version_str')]
-assert len(version_line) == 1, version_line
-version_value = version_line[0].split(' = ', 1)[-1]
-assert version_value[0] == '"', version_value
-assert version_value[-1] == '"', version_value
-version = version_value[1:-1]
+# Generate the version number
+def scm_version():
+    def local_scheme(version):
+        if version.tag and not version.distance:
+            return version.format_with("")
+        else:
+            return version.format_choice("+{node}", "+{node}.dirty")
+    return {
+        "relative_to": __file__,
+        "version_scheme": "guess-next-dev",
+        "local_scheme": local_scheme
+    }
 
 
 # Based on: https://www.benjack.io/2018/02/02/python-cpp-revisited.html
@@ -256,7 +252,7 @@ def run(self):
 setuptools.setup(
     # Package human readable information
     name="fasm",
-    version=version,
+    use_scm_version=scm_version(),
     author="SymbiFlow Authors",
     author_email="symbiflow@lists.librecores.org",
     description="FPGA Assembly (FASM) Parser and Generation library",
@@ -280,8 +276,10 @@ def run(self):
     setup_requires=[
         "wheel",
         "setuptools",
+        "setuptools_scm",
     ],
     install_requires=[
+        "importlib_metadata; python_version<'3.8'",  # for __version__
         'textx',
     ],
     # C extension building