Add version gathering logic from pyehtapp / hydrachain

Author: ulope

ethereum/__init__.py

@@ -1,18 +1,40 @@
+# -*- coding: utf-8 -*-
 # ############# version ##################
 from pkg_resources import get_distribution, DistributionNotFound
 import os.path
+import subprocess
+import re
+
+
+GIT_DESCRIBE_RE = re.compile('^(?P<version>v\d+\.\d+\.\d+)-(?P<git>\d+-g[a-fA-F0-9]+(?:-dirty)?)$')
+
+
+__version__ = None
 try:
-    _dist = get_distribution('ethereum')
+    _dist = get_distribution('pyethapp')
     # Normalize case for Windows systems
     dist_loc = os.path.normcase(_dist.location)
     here = os.path.normcase(__file__)
-    if not here.startswith(os.path.join(dist_loc, 'ethereum')):
+    if not here.startswith(os.path.join(dist_loc, 'pyethapp')):
         # not installed, but there is another version that *is*
         raise DistributionNotFound
-except DistributionNotFound:
-    __version__ = 'Please install this project with setup.py'
-else:
     __version__ = _dist.version
+except DistributionNotFound:
+    pass
+
+if not __version__:
+    try:
+        rev = subprocess.check_output(['git', 'describe', '--tags', '--dirty'],
+                                      stderr=subprocess.STDOUT)
+        match = GIT_DESCRIBE_RE.match(rev)
+        if match:
+            __version__ = "{}+git-{}".format(match.group("version"), match.group("git"))
+    except:
+        pass
+
+if not __version__:
+    __version__ = 'undefined'
+
 # ########### endversion ##################
 
 '''from ethereum import utils