setup.py: Add env variable USE_CYTHON for compilation from pyx sources

pyx source files are now used only when USE_CYTHON is set to 1 or the
C source files have not yet been pre-compiled.

Only efl.eo.c is checked for this so if you cancel an initial build make
sure to enable USE_CYTHON when re-starting the build.

The pyx sources will now be included in the source tarball.

INSTALL

@@ -26,7 +26,9 @@
 -----------------------
 
  Once EFL is built and installed in your desired destination, proceed with
- building the wrapper.
+ building the wrapper. If you downloaded a tarball with pre-generated
+ C sources you can proceed to use those, or force distutils to use pyx
+ sources by setting the environment variable USE_CYTHON to 1.
 
 
  * BUILDING WITH GCC/G++ (Linux, OS X, etc.)
@@ -41,6 +43,10 @@
 
    python setup.py build -c mingw32
 
+ * FORCING PYX SOURCES FOR BUILD
+
+   env USE_CYTHON=1 python setup.py build
+
 
 
 3. INSTALLATION:

MANIFEST.in

@@ -1,5 +1,6 @@
-include README INSTALL COPYING COPYING.LESSER AUTHORS changes.html
-recursive-include efl *.c *.h
+include README.rst INSTALL COPYING COPYING.LESSER AUTHORS changes.html
+recursive-include efl *.c *.h *.pyx *.pxi
+graft include
 graft tests
 recursive-exclude tests *.pyc
 graft examples

setup.py

@@ -84,7 +84,11 @@ def pkg_config(name, require, min_vers=None):
 
 
 # use cython or pre-generated c files
-if os.path.exists(os.path.join(script_path, "efl", "eo", "efl.eo.pyx")):
+
+if os.getenv("USE_CYTHON") or \
+    not os.path.exists(
+        os.path.join(script_path, "efl", "eo", "efl.eo.c")
+        ):
 
     module_suffix = ".pyx"