misc: PEP 440 compliant version number

setup.py

@@ -1,26 +1,52 @@
 #! /usr/bin/env python
 # -*- coding: utf-8 -*-
 
+from distutils.command.sdist import sdist
 import os
 import subprocess
-import sys
 
 from setuptools import setup, find_packages
 
-def get_version():
-    if os.path.exists('VERSION'):
-        version_file = open('VERSION', 'r')
-        version = version_file.read()
+
+class eo_sdist(sdist):
+    def run(self):
+        if os.path.exists('VERSION'):
+            os.remove('VERSION')
+        version = get_version()
+        version_file = open('VERSION', 'w')
+        version_file.write(version)
         version_file.close()
-        return version
+        sdist.run(self)
+        if os.path.exists('VERSION'):
+            os.remove('VERSION')
+
+
+def get_version():
+    '''Use the VERSION, if absent generates a version with git describe, if not
+       tag exists, take 0.0- and add the length of the commit log.
+    '''
+    if os.path.exists('VERSION'):
+        with open('VERSION', 'r') as v:
+            return v.read()
     if os.path.exists('.git'):
-        p = subprocess.Popen(['git', 'describe', '--dirty', '--match=v*'], stdout=subprocess.PIPE)
+        p = subprocess.Popen(
+            ['git', 'describe', '--dirty=.dirty', '--match=v*'],
+            stdout=subprocess.PIPE, stderr=subprocess.PIPE
+        )
         result = p.communicate()[0]
         if p.returncode == 0:
-            version = result.split()[0][1:]
-            version = version.replace('-', '.')
+            result = result.decode('ascii').strip()[1:]  # strip spaces/newlines and initial v
+            if '-' in result:  # not a tagged version
+                real_number, commit_count, commit_hash = result.split('-', 2)
+                version = '%s.post%s+%s' % (real_number, commit_count, commit_hash)
+            else:
+                version = result
             return version
-    return '0'
+        else:
+            return '0.0.post%s' % len(
+                    subprocess.check_output(
+                            ['git', 'rev-list', 'HEAD']).splitlines())
+    return '0.0'
 
 
 setup(
@@ -41,5 +67,8 @@ setup(
         'Programming Language :: Python',
         'Programming Language :: Python :: 2',
     ],
-    install_requires=['python-redmine']
+    install_requires=['python-redmine'],
+    cmdclass={
+            'sdist': eo_sdist
+    },
 )