Add some machinery to avoid importing hy in setup.py

hy/__init__.py

@@ -19,8 +19,7 @@
 # DEALINGS IN THE SOFTWARE.
 
 
-__appname__ = "hy"
-__version__ = "0.9.10"
+from hy.version import __version__, __appname__  # NOQA
 
 
 from hy.models.expression import HyExpression  # NOQA

hy/version.py

@@ -0,0 +1,23 @@
+# Copyright (c) 2013 Paul Tagliamonte <paultag@debian.org>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the "Software"),
+# to deal in the Software without restriction, including without limitation
+# the rights to use, copy, modify, merge, publish, distribute, sublicense,
+# and/or sell copies of the Software, and to permit persons to whom the
+# Software is furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+# DEALINGS IN THE SOFTWARE.
+
+
+__appname__ = "hy"
+__version__ = "0.9.10"

setup.py

@@ -20,11 +20,27 @@
 # DEALINGS IN THE SOFTWARE.
 
 
-from hy import __appname__, __version__
 from setuptools import setup
 import os
+import re
 import sys
 
+PKG = "hy"
+VERSIONFILE = os.path.join(PKG, "version.py")
+verstr = "unknown"
+try:
+    verstrline = open(VERSIONFILE, "rt").read()
+except EnvironmentError:
+    pass # Okay, there is no version file.
+else:
+    VSRE = r"^__version__ = ['\"]([^'\"]*)['\"]"
+    mo = re.search(VSRE, verstrline, re.M)
+    if mo:
+        __version__ = mo.group(1)
+    else:
+        raise RuntimeError("if %s.py exists, it is required to be well-formed" % (VERSIONFILE,))
+
+
 long_description = """Hy is a Python <--> Lisp layer. It helps
 make things work nicer, and lets Python and the Hy lisp variant play
 nice together. """
@@ -36,7 +52,7 @@ if os.name == 'nt':
     install_requires.append('pyreadline==2.0')
 
 setup(
-    name=__appname__,
+    name=PKG,
     version=__version__,
     install_requires=install_requires,
     entry_points={