docs autodetect version.

lib/spack/docs/conf.py

@@ -35,7 +35,9 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.
 
-import sys, os
+import sys
+import os
+import subprocess
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
@@ -43,9 +45,13 @@
 sys.path.insert(0, os.path.abspath('exts'))
 
 # Add the Spack bin directory to the path so that we can use its output in docs.
-os.environ['SPACK_ROOT'] = '../../..'
+spack_root = '../../..'
+os.environ['SPACK_ROOT'] = spack_root
 os.environ['PATH'] += os.pathsep + '$SPACK_ROOT/bin'
 
+spack_version =  subprocess.Popen(
+    ['spack', '-V'], stderr=subprocess.PIPE).communicate()[1].strip().split('.')
+
 # Set an environment variable so that colify will print output like it would to
 # a terminal.
 os.environ['COLIFY_TTY'] = 'true'
@@ -97,9 +103,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '1.0'
+version = '.'.join(spack_version[:2])
 # The full version, including alpha/beta/rc tags.
-release = '1.0'
+release = '.'.join(spack_version[:2])
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.