add ectrans python interface ectrans4py

CMakeLists.txt

@@ -35,6 +35,7 @@ ecbuild_add_option( FEATURE SINGLE_PRECISION
                     DEFAULT ON
                     DESCRIPTION "Support for Single Precision" )
 
+
 if( HAVE_SINGLE_PRECISION )
   set( single "single" )
 endif()
@@ -64,6 +65,13 @@ ecbuild_add_option( FEATURE ETRANS
                     DEFAULT OFF
                     DESCRIPTION "Include Limited-Area-Model Transforms" )
 
+
+ecbuild_add_option( FEATURE ECTRANS4PY
+                    DEFAULT OFF
+		    CONDITION HAVE_ETRANS
+                    DESCRIPTION "Compile ectrans4py interface routines for python binding w/ ctypesForFortran" )
+
+
 ectrans_find_lapack()
 
 ### Add sources and tests

MANIFEST.in

@@ -0,0 +1,8 @@
+include AUTHORS
+include CMakeLists.txt
+include LICENSE
+include README.md
+include VERSION
+recursive-include src *
+recursive-include cmake *
+recursive-include tests *

pyproject.toml

@@ -0,0 +1,4 @@
+[build-system]
+requires = ["setuptools", "wheel", "scikit-build"]
+build-backend = "setuptools.build_meta"
+

setup.py

@@ -0,0 +1,32 @@
+import os
+import re
+import ast
+from skbuild import setup
+
+def get_version():   # remove this part 
+    version_file = os.path.join("src", "ectrans4py", "__init__.py")
+    with open(version_file, "r", encoding="utf-8") as f:
+        content = f.read()
+        version_match = re.search(r"^__version__\s*=\s*['\"]([^'\"]*)['\"]", content, re.M)
+        if version_match:
+            return version_match.group(1)
+        raise RuntimeError("Unable to find version string.")
+
+version=get_version()
+# ectrans4py package : 
+setup(
+    name="ectrans4py",
+    version=version, 
+    packages=['ectrans4py'],
+    cmake_minimum_required_version="3.13",
+    cmake_args=[
+        '-DENABLE_ETRANS=ON',  
+        '-DENABLE_ECTRANS4PY=ON',
+        '-DENABLE_SINGLE_PRECISION=OFF',
+        '-DENABLE_OMP=OFF',
+    ],
+    package_dir={"": "src"},
+    cmake_install_dir="src/ectrans4py",
+    setup_requires=["scikit-build", "setuptools"],
+    install_requires=["numpy", "ctypesforfortran==1.1.3"],
+)

src/CMakeLists.txt

@@ -13,4 +13,7 @@ if( HAVE_TRANSI )
 endif()
 if( HAVE_ETRANS )
   add_subdirectory(etrans)
-endif()
+endif()
+if(HAVE_ECTRANS4PY)
+  add_subdirectory(ectrans4py)
+endif()

src/ectrans4py/CMakeLists.txt

@@ -0,0 +1,20 @@
+if(HAVE_ETRANS)
+    # (using CMAKE_CURRENT_SOURCE_DIR is necessary because sources are in a different directory than the target library (trans_${prec}))
+    ecbuild_list_add_pattern(
+        LIST ectrans4py_src
+        GLOB ${CMAKE_CURRENT_SOURCE_DIR}/*.F90
+        QUIET
+    )
+
+    set(HAVE_dp ${HAVE_DOUBLE_PRECISION})
+    set(prec dp)
+
+    if(HAVE_${prec})
+        # Add sources
+        target_sources(trans_${prec} PRIVATE ${ectrans4py_src})
+    endif()
+
+else()
+    ecbuild_critical("To activate the ectrans Python interface, you must enable the ETRANS option.")
+endif()
+