Core: Fix pytest rebuilder and improve editable installation detection

src/faebryk/core/cpp/__init__.py

@@ -1,19 +1,24 @@
 # This file is part of the faebryk project
 # SPDX-License-Identifier: MIT
 
+import json
 import logging
 import pathlib
 import shutil
-import site
+from importlib.metadata import Distribution
 from typing import Callable
 
 logger = logging.getLogger(__name__)
 
 
 # Check if installed as editable
 def is_editable_install():
-    site_packages = site.getsitepackages()
-    return not any((pathlib.Path(sp) / "faebryk").exists() for sp in site_packages)
+    distro = Distribution.from_name(__name__.split(".")[0])
+    return (
+        json.loads(distro.read_text("direct_url.json"))
+        .get("dir_info", {})
+        .get("editable", False)
+    )
 
 
 def compile_and_load():
@@ -43,7 +48,7 @@ def _do(*args, **kwargs):
             "cmake not found, needed for compiling c++ code in editable mode"
         )
 
-    pybind11_dir = _do(["python", "-m", "pybind11", "--cmakedir"]).strip()
+    pybind11_dir = _do([sys.executable, "-m", "pybind11", "--cmakedir"]).strip()
 
     # Force recompile
     # subprocess.run(["rm", "-rf", str(build_dir)], check=True)