Stop using deprecated __conda_version__.txt file.

Add dummy setup.py file and use the jinja template function to get the
version string.

Author: pavoljuhas

conda-recipe/build.sh

@@ -21,6 +21,3 @@ scons test
 
 # Install the library.
 scons install prefix=$PREFIX
-
-grep '^#define DIFFPY_VERSION_STR' < "${PREFIX}/include/diffpy/version.hpp" |
-    cut -d '"' -f 2 > __conda_version__.txt

conda-recipe/meta.yaml

@@ -1,7 +1,8 @@
+{% set setupdata = load_setup_py_data(from_recipe_dir=True) %}
+
 package:
   name: libdiffpy
-  ## Use __conda_version__.txt.
-  # version: 1.3
+  version: {{ setupdata['version'] }}
 
 source:
   # git_url: https://github.com/diffpy/libdiffpy.git

conda-recipe/setup.py

@@ -0,0 +1,22 @@
+#!/usr/bin/env python
+
+"""\
+Dummy distutils setup script that provides version data for meta.yaml.
+"""
+
+import os
+import sys
+from distutils.core import setup
+
+MYDIR = os.path.dirname(os.path.abspath(__file__))
+SITESCONSDIR = os.path.abspath(os.path.join(MYDIR, '../site_scons'))
+sys.path.insert(0, SITESCONSDIR)
+
+from libdiffpybuildutils import gitinfo
+
+ginfo = gitinfo()
+
+setup(
+    name='libdiffpy',
+    version=ginfo['version'],
+)