Fix missing metadata in MacOS wheels.

The TCOD_TAG environment variable was skipping writing to version.py.

Author: HexDecimal

CHANGELOG.rst

@@ -8,6 +8,8 @@ v2.0.0
 
 Unreleased
 ------------------
+Fixed
+ - MacOS wheels had broken version metadata.
 
 11.19.2 - 2020-12-30
 --------------------

setup.py

@@ -15,6 +15,10 @@
 def get_version():
     """Get the current version from a git tag, or by reading tcod/version.py"""
     if os.environ.get("TCOD_TAG"):
+        # Force a tag version from an environment variable.
+        # Needed to work with GitHub Actions.
+        with open("tcod/version.py", "w") as f:
+            f.write('__version__ = "%s"\n' % os.environ["TCOD_TAG"])
         return os.environ["TCOD_TAG"]
     try:
         tag = check_output(
@@ -33,7 +37,8 @@ def get_version():
             version += ".dev%i" % commits_since_tag
 
         # update tcod/version.py
-        open("tcod/version.py", "w").write('__version__ = "%s"\n' % version)
+        with open("tcod/version.py", "w") as f:
+            f.write('__version__ = "%s"\n' % version)
         return version
     except:
         try: