Use version for git in documentation

Author: ljosa

docs/conf.py

@@ -43,14 +43,31 @@
 project = u'python-bioformats'
 copyright = u'2014, Broad Institute of MIT and Harvard'
 
+def get_version():
+    version_file = os.path.join(os.path.dirname(__file__), '..', 'bioformats',
+                                '_version.py')
+    if os.path.exists(version_file):
+        with open(version_file) as f:
+            cached_version_line = f.read().strip()
+        try:
+            import re
+            # From http://stackoverflow.com/a/3619714/17498
+            cached_version = re.search(r"^__version__ = ['\"]([^'\"]*)['\"]", 
+                                       cached_version_line, re.M).group(1)
+        except:
+            raise RuntimeError("Unable to find version in %s" % version_file)
+        split_version = cached_version.split('.')
+        return '.'.join(split_version[:2]), cached_version
+    else:
+        return '0.0', '0.0.0'
+
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 #
-# The short X.Y version.
-version = '1.0'
-# The full version, including alpha/beta/rc tags.
-release = '1.0.0pr3'
+# version: The short X.Y version.
+# release: The full version, including alpha/beta/rc tags.
+version, release = get_version()
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.