Merge branch 'extension-sources-relative-paths' into 'develop'

Store Cython extension sources as relative paths in setup.py

See merge request !78

setup.py

@@ -3,6 +3,7 @@ from setuptools import setup, find_packages
 import os
 import sys
 import platform
+from pathlib import Path
 from Cython.Build import build_ext, cythonize
 from Cython.Distutils import Extension
 
@@ -23,8 +24,9 @@ def get_conda_paths():
 def make_extension(relpath, **kwargs):
     import numpy as np
 
-    root_dir = os.path.join(os.path.abspath(os.path.dirname(__file__)), "src")
-    finesse_dir = os.path.join(root_dir, "finesse")
+    here = Path(__file__).parent.absolute()
+    src_dir = Path("src")
+    finesse_dir = src_dir / "finesse"
 
     def construct_ext_name(rp):
         names = []
@@ -63,7 +65,7 @@ def make_extension(relpath, **kwargs):
 
     include_dirs = ext_args.get("include_dirs")
     # Include the src/finesse and NumPy header file directories
-    include_dirs.extend([finesse_dir, np.get_include()])
+    include_dirs.extend([str(here / finesse_dir), np.get_include()])
 
     # Now ensure suitesparse headers get included
     USR_SUITESPARSE_PATH = "/usr/include/suitesparse"
@@ -112,7 +114,7 @@ def make_extension(relpath, **kwargs):
             arg_list += extra_args
 
     ext_name = "finesse." + construct_ext_name(relpath)
-    sources = [os.path.join(finesse_dir, relpath)]
+    sources = [str(finesse_dir / relpath)]
 
     return Extension(ext_name, sources, language="c", **ext_args,)