Add __version__ and use it in setup.py

Author: akx

emrichen/__init__.py

@@ -2,6 +2,8 @@
 from .template import Template
 from .tags import Var
 
+__version__ = '0.2.1'
+
 
 __all__ = ['Context', 'Template', 'Var', 'emrichen']
 

setup.py

@@ -1,15 +1,23 @@
 #!/usr/bin/env python
 
 import os
+import re
 from setuptools import find_packages, setup
 
+source_dir = os.path.abspath(os.path.dirname(__file__))
 
-with open(os.path.join(os.path.abspath(os.path.dirname(__file__)), 'README.md'), encoding='utf-8') as f:
+
+with open(os.path.join(source_dir, 'emrichen', '__init__.py'), 'r') as f:
+    version = re.search("__version__ = ['\"]([^'\"]+)['\"]", f.read()).group(1)
+
+
+with open(os.path.join(source_dir, 'README.md'), encoding='utf-8') as f:
     long_description = f.read()
 
+
 setup(
     name='emrichen',
-    version='0.2.1',
+    version=version,
     description='Template engine for YAML & JSON',
     long_description=long_description,
     long_description_content_type='text/markdown',