From c6e17df809ed3d0f476a3588e6a21d25a6fb7f0d Mon Sep 17 00:00:00 2001
From: paugier <pierre.augier@univ-grenoble-alpes.fr>
Date: Wed, 14 Feb 2024 22:34:39 +0100
Subject: [PATCH 1/2] Reproduce issue with Meson + editable mode in
 test_meson.py

---
 .../src/package_for_test_meson/foo.py         |  5 ++++-
 tests/test_meson.py                           | 20 ++++++++++++++++++-
 2 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/data_tests/package_for_test_meson/src/package_for_test_meson/foo.py b/data_tests/package_for_test_meson/src/package_for_test_meson/foo.py
index 7a0704d..a5b9d2d 100644
--- a/data_tests/package_for_test_meson/src/package_for_test_meson/foo.py
+++ b/data_tests/package_for_test_meson/src/package_for_test_meson/foo.py
@@ -1,4 +1,7 @@
-from transonic import boost
+from transonic import boost, Transonic
+
+# used for testing
+ts = Transonic()
 
 
 @boost
diff --git a/tests/test_meson.py b/tests/test_meson.py
index 9b48b2d..e243df1 100644
--- a/tests/test_meson.py
+++ b/tests/test_meson.py
@@ -45,6 +45,18 @@ def run_in_venv(venv, command, cwd=None):
     subprocess.run(args, cwd=cwd, check=True, env=env)
 
 
+def eval_in_venv(venv, code):
+    process = subprocess.run(
+        [venv.python, "-c", code],
+        env=venv.env,
+        check=True,
+        capture_output=True,
+        text=True,
+        encoding="utf-8",
+    )
+    return process.stdout
+
+
 @pytest.mark.xfail(
     sys.platform.startswith("win"), reason="Buggy on Windows (TODO: debug)"
 )
@@ -89,7 +101,7 @@ def test_install_package(tmpdir, venv):
     if backend_default == "pythran":
         run_in_venv(venv, "pip install pythran")
 
-    install_command = "pip install . --no-build-isolation"
+    install_command = "pip install -e . --no-build-isolation"
     if backend_default == "python":
         install_command += (
             " --config-settings=setup-args=-Dtransonic-backend=python"
@@ -98,6 +110,12 @@ def test_install_package(tmpdir, venv):
     run_in_venv(venv, install_command, cwd=tmpdir)
     run_in_venv(venv, "pytest tests", cwd=tmpdir)
 
+    out = eval_in_venv(
+        venv, "from package_for_test_meson.foo import ts; print(ts.is_compiled)"
+    ).strip()
+    is_compiled = out == "True"
+    assert is_compiled
+
 
 @pytest.mark.skipif(nb_proc > 1, reason="No commandline in MPI")
 @pytest.mark.xfail(backend_default == "cython", reason="Not yet implemented")

From 3765204212face7fe29f8038117585d33a167c86 Mon Sep 17 00:00:00 2001
From: paugier <pierre.augier@univ-grenoble-alpes.fr>
Date: Wed, 14 Feb 2024 23:40:46 +0100
Subject: [PATCH 2/2] Fix issue with Meson + editable mode (at least for
 Pythran)

---
 src/transonic/aheadoftime.py | 16 ++++++++++++++--
 src/transonic/backends/py.py |  7 ++++++-
 2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/src/transonic/aheadoftime.py b/src/transonic/aheadoftime.py
index 72bbfa7..53b85ba 100644
--- a/src/transonic/aheadoftime.py
+++ b/src/transonic/aheadoftime.py
@@ -27,6 +27,7 @@
 import os
 import functools
 import sys
+from importlib import import_module
 
 from transonic.backends import backends, get_backend_name_module
 from transonic.config import has_to_replace, backend_default
@@ -236,9 +237,20 @@ def __init__(
             path_mod.parent / f"__{backend.name}__" / (module_short_name + suffix)
         )
 
-        path_ext = None
+        # for Meson, we try to import module_backend_name
+        try:
+            _module_backend = import_module(module_backend_name)
+        except ImportError:
+            path_ext = None
+        else:
+            if backend.check_if_compiled(_module_backend):
+                path_ext = Path(_module_backend.__file__)
+                if not path_ext.exists():
+                    path_ext = None
+            else:
+                path_ext = None
 
-        if has_to_compile_at_import() and path_mod.exists():
+        if has_to_compile_at_import() and path_mod.exists() and path_ext is None:
             if mpi.has_to_build(path_backend, path_mod):
                 if path_backend.exists():
                     time_backend = mpi.modification_date(path_backend)
diff --git a/src/transonic/backends/py.py b/src/transonic/backends/py.py
index 2ce75ef..9f0a7dd 100644
--- a/src/transonic/backends/py.py
+++ b/src/transonic/backends/py.py
@@ -52,7 +52,12 @@ def compile_extension(
         if name_ext_file is None:
             name_ext_file = self.name_ext_from_path_backend(path_backend)
 
-        copyfile(path_backend, path_backend.with_name(name_ext_file))
+        if not path_backend.exists():
+            raise IOError("not path_backend.exists()")
+
+        path_ext = path_backend.with_name(name_ext_file)
+        if path_backend != path_ext:
+            copyfile(path_backend, path_ext)
         compiling = False
         process = None
         return compiling, process