Include c files in distribution

.gitignore

@@ -1,7 +1,6 @@
 .idea/
 venv/
 build/
-*.c
 *.so
 *.egg-info/
 __pycache__/

requirements.txt

@@ -4,4 +4,4 @@ numpy==1.14.4
 pyFFTW==0.10.4
 pynndescent==0.2.0
 scikit-learn==0.19.1
-scipy==1.1.0
+scipy==1.1.0

setup.py

@@ -1,28 +1,36 @@
-import setuptools
-from setuptools import setup
-from distutils.extension import Extension
-from Cython.Build import cythonize
+import os
+
 import numpy as np
+import setuptools
+from setuptools import setup, Extension
 
+USE_CYTHON = os.environ.get('USE_CYTHON', False)
+ext = 'pyx' if USE_CYTHON else 'c'
 
 extensions = [
-    Extension('tsne.quad_tree', ['tsne/quad_tree.pyx'],
+    Extension('tsne.quad_tree', ['tsne/quad_tree.%s' % ext],
               extra_compile_args=['-fopenmp', '-O3'],
               extra_link_args=['-fopenmp', '-O3'],
               include_dirs=[np.get_include()],
               ),
-    Extension('tsne._tsne', ['tsne/_tsne.pyx'],
+    Extension('tsne._tsne', ['tsne/_tsne.%s' % ext],
               extra_compile_args=['-fopenmp', '-lfftw3', '-O3'],
               extra_link_args=['-fopenmp', '-lfftw3', '-O3'],
               include_dirs=[np.get_include()],
               ),
-    Extension('tsne.kl_divergence', ['tsne/kl_divergence.pyx'],
+    Extension('tsne.kl_divergence', ['tsne/kl_divergence.%s' % ext],
               extra_compile_args=['-fopenmp', '-O3'],
               extra_link_args=['-fopenmp', '-O3'],
               include_dirs=[np.get_include()],
               ),
 ]
 
+if USE_CYTHON:
+    from Cython.Build import cythonize
+    extensions = cythonize(extensions)
+
+print(extensions)
+
 setup(
     name='t-SNE',
     description='',
@@ -31,5 +39,5 @@
     version='0.1.1',
     url='https://github.com/pavlin-policar/tSNE',
     packages=setuptools.find_packages(),
-    ext_modules=cythonize(extensions),
+    ext_modules=extensions,
 )