Remove the documentation's dependency on Hy itself

docs/conf.py

@@ -11,12 +11,13 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.
 
-import os
-import sys
-import time
+import os, sys, time
 sys.path.append(os.path.abspath(".."))
 
-import hy
+from get_version import __version__ as hy_version
+if hy_version.endswith(".dirty"):
+    # Read the Docs might dirty its checkout, so ignore this.
+    hy_version = hy_version[:-len(".dirty")]
 
 # 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
@@ -53,9 +54,9 @@ copyright = u'%s the authors' % time.strftime('%Y')
 # built documents.
 #
 # The short X.Y version.
-version = ".".join(hy.__version__.split(".")[:-1])
+version = ".".join(hy_version.split(".")[:-1])
 # The full version, including alpha/beta/rc tags.
-release = hy.__version__
+release = hy_version
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.

get_version.py

@@ -0,0 +1,20 @@
+import os, subprocess, runpy
+
+# Try to get and update the version.
+
+os.chdir(os.path.split(os.path.abspath(__file__))[0])
+VERSIONFILE = os.path.join("hy", "version.py")
+
+try:
+    __version__ = (subprocess.check_output
+                   (["git", "describe", "--tags", "--dirty"])
+                   .decode('ASCII').strip()
+                   .replace('-', '+', 1).replace('-', '.'))
+    with open(VERSIONFILE, "wt") as o:
+        o.write("__version__ = {!r}\n".format(__version__))
+
+except (subprocess.CalledProcessError, OSError):
+    if os.path.exists(VERSIONFILE):
+        __version__ = runpy.run_path(VERSIONFILE)['__version__']
+    else:
+        __version__ = "unknown"

setup.py

@@ -3,31 +3,16 @@
 # This file is part of Hy, which is free software licensed under the Expat
 # license. See the LICENSE.
 
-import os
-import re
-import sys
-import runpy
-import subprocess
+import sys, os
 
 from setuptools import find_packages, setup
 from setuptools.command.install import install
 
+from get_version import __version__
+
 os.chdir(os.path.split(os.path.abspath(__file__))[0])
 
 PKG = "hy"
-VERSIONFILE = os.path.join(PKG, "version.py")
-try:
-    __version__ = (subprocess.check_output
-        (["git", "describe", "--tags", "--dirty"])
-        .decode('ASCII').strip()
-        .replace('-', '+', 1).replace('-', '.'))
-    with open(VERSIONFILE, "wt") as o:
-        o.write("__version__ = {!r}\n".format(__version__))
-except (subprocess.CalledProcessError, OSError):
-    if os.path.exists(VERSIONFILE):
-        __version__ = runpy.run_path(VERSIONFILE)['__version__']
-    else:
-        __version__ = "unknown"
 
 long_description = """Hy is a Python <--> Lisp layer. It helps
 make things work nicer, and lets Python and the Hy lisp variant play