Use a better single-sourced version setup

Fun read:
https://packaging.python.org/guides/single-sourcing-package-version/

Anyway, I hated this way the least.

Signed-off-by: Konstantin Ryabitsev <konstantin@linuxfoundation.org>

1 files changed, 10 insertions, 2 deletions

diff --git a/setup.py b/setup.py
index 5b37505..ed24367 100644
--- a/setup.py
+++ b/setup.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
 
 import os
-import b4
+import re
 from setuptools import setup
 
 # Utility function to read the README file.
@@ -14,10 +14,18 @@ def read(fname):
     return open(os.path.join(os.path.dirname(__file__), fname)).read()
 
 
+def find_version(source):
+    version_file = read(source)
+    version_match = re.search(r"^__VERSION__ = ['\"]([^'\"]*)['\"]", version_file, re.M)
+    if version_match:
+        return version_match.group(1)
+    raise RuntimeError("Unable to find version string.")
+
+
 NAME = 'b4'
 
 setup(
-    version=b4.VERSION,
+    version=find_version('b4/__init__.py'),
     url='https://git.kernel.org/pub/scm/utils/b4/b4.git',
     name=NAME,
     description='A tool to work with public-inbox and patch archives',