From 6b128086d7b7c10784d434ef566b0af3a9ef3474 Mon Sep 17 00:00:00 2001
From: Erik Stein <erik@classlibrary.net>
Date: Tue, 12 Jun 2018 22:18:23 +0200
Subject: [PATCH] Improved get_version.

---
 setup.py | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/setup.py b/setup.py
index a3cf634..61b09c0 100644
--- a/setup.py
+++ b/setup.py
@@ -1,16 +1,25 @@
 #!/usr/bin/env python
 
 from io import open
-from setuptools import setup, find_packages
+from setuptools import find_packages, setup
 import os
 import re
 import subprocess
 
 
+"""
+Use `git tag 1.0.0` to tag a release; `python setup.py --version`
+to update the  _version.py file.
+"""
+
+
 def get_version(prefix):
     if os.path.exists('.git'):
         parts = subprocess.check_output(['git', 'describe', '--tags']).decode().strip().split('-')
-        version = '{}.{}+{}'.format(*parts)
+        if len(parts) == 3:
+            version = '{}.{}+{}'.format(*parts)
+        else:
+            version = parts[0]
         version_py = "__version__ = '{}'".format(version)
         _version = os.path.join(prefix, '_version.py')
         if not os.path.exists(_version) or open(_version).read().strip() != version_py: