Merge pull request #97 from s-kostyuk/package_version

Added version information to the everpl package root

This pull request adds a new variable called "__version__" to the root of everpl (currently dpl) package. Also it switches the package version source in setup.py file to the package __init__ file.

Closes #28

dpl/__init__.py

@@ -1,3 +1,5 @@
 import os
 
 DPL_INSTALL_PATH = os.path.dirname(__file__)
+
+__version__ = '0.3.0'

setup.py

@@ -4,6 +4,8 @@
 https://github.com/pypa/sampleproject
 """
 
+import pathlib
+import re
 # Always prefer setuptools over distutils
 from setuptools import setup, find_packages
 # To use a consistent encoding
@@ -20,6 +22,17 @@
 # Arguments marked as "Required" below must be included for upload to PyPI.
 # Fields marked as "Optional" may be commented out.
 
+# Extract everpl version from a package __init__ file
+here = pathlib.Path(__file__).parent
+
+txt = (here / 'dpl' / '__init__.py').read_text('utf-8')
+try:
+    version = re.findall(r"^__version__ = '([^']+)'\r?$",
+                         txt, re.M)[0]
+except IndexError:
+    raise RuntimeError('Unable to determine version.')
+
+# Start "setup" section
 setup(
     # This is the name of your project. The first time you publish this
     # package, this name will be registered for you. It will determine how
@@ -40,7 +53,7 @@
     # For a discussion on single-sourcing the version across setup.py and the
     # project code, see
     # https://packaging.python.org/en/latest/single_source_version.html
-    version='0.3.0',  # Required
+    version=version,  # Required
 
     # This is a one-line description or tagline of what your project does. This
     # corresponds to the "Summary" metadata field: