Building GLPK shared library as extension; need to switch to using it…

… by default and see if Windows freaks out

setup.py

@@ -1,6 +1,28 @@
 '''Install scikit-glpk bindings.'''
 
 from setuptools import find_packages, setup
+from distutils.core import Extension
+import pathlib
+
+GLPK_SRC_DIR = pathlib.Path('glpk-4.65/src')
+
+def scrape_makefile_list(filename, START_TOKEN, END_TOKEN):
+    with open(filename, 'r', encoding='utf-8') as f:
+        _contents = f.read()
+        sidx = _contents.find(START_TOKEN)
+        eidx = _contents.find(END_TOKEN)
+        lines = _contents[sidx+len(START_TOKEN):eidx].splitlines()
+        return [str(_l.replace('\\', '').strip()) for _l in lines]
+
+# Get sources for GLPK
+makefile = GLPK_SRC_DIR / 'Makefile.am'
+sources = scrape_makefile_list(makefile, 'libglpk_la_SOURCES = \\\n', '\n## eof ##')
+sources = [str(GLPK_SRC_DIR / _s) for _s in sources]
+
+# Get include dirs for GLPK
+include_dirs = scrape_makefile_list(makefile, 'libglpk_la_CPPFLAGS = \\\n', '\nlibglpk_la_LDFLAGS')
+include_dirs = [str(GLPK_SRC_DIR / _d[len('-I($srcdir)/'):]) for _d in include_dirs]
+
 
 setup(
     name='scikit-glpk',
@@ -15,4 +37,13 @@
     keywords='glpk linprog scikit',
     install_requires=open('requirements.txt').read().split(),
     python_requires='>=3.5',
+
+    ext_modules=[
+        Extension(
+            'glpk4_65',
+            sources=sources,
+            include_dirs=include_dirs,
+            language='c',
+        )
+    ],
 )