Updated versioning scheme

Author: Clark Perkins

stackdio/client/version.py

@@ -15,19 +15,86 @@
 # limitations under the License.
 #
 
-from functools import wraps
+import datetime
 import operator
+import os
 import re
+import subprocess
 import warnings
+from functools import wraps
 
 # for setup.py
 try:
     from .exceptions import IncompatibleVersionException, InvalidVersionStringException
 except Exception:
     pass
 
+VERSION = (0, 7, 0, 'dev', 0)
+
+
+def get_version(version):
+    """
+    Returns a PEP 440-compliant version number from VERSION.
+
+    Created by modifying django.utils.version.get_version
+    """
+
+    # Now build the two parts of the version number:
+    # major = X.Y[.Z]
+    # sub = .devN - for development releases
+    #     | {a|b|rc}N - for alpha, beta and rc releases
+    #     | .postN - for post-release releases
+
+    assert len(version) == 5
+
+    version_parts = version[:3]
+
+    # Build the first part of the version
+    major = '.'.join(str(x) for x in version_parts)
+
+    # Just return it if this is a final release version
+    if version[3] == 'final':
+        return major
+
+    # Add the rest
+    sub = ''.join(str(x) for x in version[3:5])
+
+    if version[3] == 'dev':
+        # Override the sub part.  Add in a timestamp
+        timestamp = get_git_changeset()
+        sub = 'dev%s' % (timestamp if timestamp else '')
+        return '%s.%s' % (major, sub)
+    if version[3] == 'post':
+        # We need a dot for post
+        return '%s.%s' % (major, sub)
+    elif version[3] in ('a', 'b', 'rc'):
+        # No dot for these
+        return '%s%s' % (major, sub)
+    else:
+        raise ValueError('Invalid version: %s' % str(version))
+
+
+# Borrowed directly from django
+def get_git_changeset():
+    """Returns a numeric identifier of the latest git changeset.
+
+    The result is the UTC timestamp of the changeset in YYYYMMDDHHMMSS format.
+    This value isn't guaranteed to be unique, but collisions are very unlikely,
+    so it's sufficient for generating the development version numbers.
+    """
+    repo_dir = os.path.dirname(os.path.abspath(__file__))
+    git_log = subprocess.Popen('git log --pretty=format:%ct --quiet -1 HEAD',
+                               stdout=subprocess.PIPE, stderr=subprocess.PIPE,
+                               shell=True, cwd=repo_dir, universal_newlines=True)
+    timestamp = git_log.communicate()[0]
+    try:
+        timestamp = datetime.datetime.utcfromtimestamp(int(timestamp))
+        return timestamp.strftime('%Y%m%d%H%M%S')
+    except ValueError:
+        return None
+
 
-__version__ = '0.7.0.dev'
+__version__ = get_version(VERSION)
 
 
 def _unsupported_function(func, current_version, accepted_versions):