Add setup.py

Author: Ramsay, Grant (NZ)

python/VL53L0X.py

@@ -65,7 +65,15 @@ def i2c_write(address, reg, data_p, length):
     return ret_val
 
 # Load VL53L0X shared lib 
-tof_lib = CDLL("../bin/vl53l0x_python.so")
+_possible_lib_locations = site.getsitepackages() + ['../bin']
+for lib_location in _possible_lib_locations:
+    try:
+        tof_lib = CDLL(lib_location + "/vl53l0x_python.so")
+        break
+    except OSError:
+        pass
+else:
+    raise OSError('Could not find vl53l0x_python.so')
 
 # Create read function pointer
 READFUNC = CFUNCTYPE(c_int, c_ubyte, c_ubyte, POINTER(c_ubyte), c_ubyte)

setup.py

@@ -0,0 +1,56 @@
+from distutils.core import setup, Extension
+from distutils.command.build_ext import build_ext
+
+
+# Found this on stack overflow:
+# https://stackoverflow.com/questions/4529555/building-a-ctypes-based-c-library-with-distutils
+# noinspection PyPep8Naming
+class build_ext(build_ext):
+
+    def build_extension(self, ext):
+        # noinspection PyAttributeOutsideInit
+        self._ctypes = isinstance(ext, CTypesExtension)
+        return super().build_extension(ext)
+
+    def get_export_symbols(self, ext):
+        if self._ctypes:
+            return ext.export_symbols
+        return super().get_export_symbols(ext)
+
+    def get_ext_filename(self, ext_name):
+        if self._ctypes:
+            return ext_name + '.so'
+        return super().get_ext_filename(ext_name)
+
+
+class CTypesExtension(Extension):
+    pass
+
+
+extension = CTypesExtension(
+    'vl53l0x_python',
+    define_macros=[],
+    include_dirs=['.', 'Api/core/inc', 'platform/inc'],
+    libraries=[],
+    library_dirs=[],
+    sources=['Api/core/src/vl53l0x_api_calibration.c',
+             'Api/core/src/vl53l0x_api_core.c',
+             'Api/core/src/vl53l0x_api_ranging.c',
+             'Api/core/src/vl53l0x_api_strings.c',
+             'Api/core/src/vl53l0x_api.c',
+             'platform/src/vl53l0x_platform.c',
+             'python_lib/vl53l0x_python.c'])
+
+setup(name='VL53L0X_rasp_python',
+      version='1.0.2',
+      description='VL53L0X sensor for raspberry PI',
+      # author='?',
+      # author_email='?',
+      url='https://github.com/johnbryanmoore/VL53L0X_rasp_python',
+      long_description='''
+VL53L0X sensor for raspberry PI.
+''',
+      ext_modules=[extension],
+      package_dir={'': 'python'},
+      py_modules=['VL53L0X'],
+      cmdclass={'build_ext': build_ext})