setup: use scikit-build for building C module

.gitignore

@@ -1,3 +1,4 @@
+_skbuild
 doc/_build
 doc/auto_examples
 doc/gen_modules

pyproject.toml

@@ -0,0 +1,2 @@
+[build-system]
+requires = ["setuptools", "wheel", "scikit-build", "cmake", "cython", "ninja"]

requirements-dev.txt

@@ -1,10 +1,19 @@
+# build-system
+cmake
+cython
+ninja
+scikit-build
+setuptools>=28.0.0
+wheel
+
+# testing
 codecov
 coverage
 flake8
 mock
 pytest
 pytest-cov
 pytest-sugar
-setuptools>=28.0.0
+
+# deployment
 twine
-wheel

setup.py

@@ -1,6 +1,5 @@
 import io
-from setuptools import setup
-from setuptools.extension import Extension
+from skbuild import setup
 import versioneer
 
 with io.open('README.md', encoding='utf_8') as fp:
@@ -19,9 +18,9 @@
     license='MIT',
     install_requires=['numpy>=1.6.1', 'pillow'],
     test_requires=['matplotlib'],
-    ext_modules=[Extension("wordcloud.query_integral_image",
-                           ["wordcloud/query_integral_image.c"])],
     entry_points={'console_scripts': ['wordcloud_cli=wordcloud.__main__:main']},
     packages=['wordcloud'],
-    package_data={'wordcloud': ['stopwords', 'DroidSansMono.ttf']}
+    package_data={'wordcloud': ['stopwords', 'DroidSansMono.ttf']},
+    cmake_languages=('C',),
+    cmake_source_dir='wordcloud'
 )

wordcloud/CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.12.0)
+project(hello LANGUAGES C)
+
+find_package(PythonExtensions REQUIRED)
+find_package(Cython REQUIRED)
+
+set(module "query_integral_image")
+
+add_cython_target(${module} ${module}.pyx C OUTPUT_VAR sources)
+add_library(${module} MODULE ${sources})
+python_extension_module(${module})
+
+install(TARGETS ${module} LIBRARY DESTINATION wordcloud)