Port build system to meson and project configuration to pyproject.toml

Makefile

@@ -1,41 +1,5 @@
-FC = gfortran
-FCFLAGS = -g -c -fdefault-real-8 -fPIC -fno-second-underscore -fbacktrace -fno-align-commons -fbounds-check -std=legacy
-LDFLAGS =
+install:
+	pip install .
 
-MODDIR := .mod
-ifneq ($(MODDIR),)
-  $(shell test -d $(MODDIR) || mkdir -p $(MODDIR))
-  FCFLAGS+= -J $(MODDIR)
-endif
-
-SRCS =  MOM_io.F90 MOM_error_handler.F90 ../MOM6/src/ALE/polynomial_functions.F90\
-	../MOM6/src/framework/MOM_string_functions.F90\
-	../MOM6/src/ALE/regrid_solvers.F90 ../MOM6/src/ALE/regrid_edge_values.F90\
-	../MOM6/src/ALE/regrid_consts.F90 ../MOM6/src/ALE/P1M_functions.F90\
-	../MOM6/src/ALE/regrid_consts.F90 ../MOM6/src/ALE/PCM_functions.F90\
-	../MOM6/src/ALE/regrid_consts.F90 ../MOM6/src/ALE/P3M_functions.F90\
-	../MOM6/src/ALE/regrid_consts.F90 ../MOM6/src/ALE/PLM_functions.F90\
-	../MOM6/src/ALE/regrid_consts.F90 ../MOM6/src/ALE/PPM_functions.F90\
-	../MOM6/src/ALE/regrid_consts.F90 ../MOM6/src/ALE/PQM_functions.F90\
-	../MOM6/src/ALE/regrid_interp.F90 ../MOM6/src/ALE/MOM_remapping.F90\
-        ../MOM6/src/ALE/MOM_remapping.F90
-
-
-OBJECTS = $(SRCS:.F90=.o)
-TARGET = libRemap.a
-
-
-$(TARGET): $(OBJECTS)
-	rm -f $@
-	ar cr $@ $^
-	python setup.py config_fc --f90flags="-g -c -fdefault-real-8 -fPIC -fno-second-underscore -fbacktrace -fno-align-commons -fbounds-check" --fcompiler=gfortran build
-	python setup.py install
-
-%.o: %.F90
-	$(FC) $(FCFLAGS) -I ../MOM6/config_src/memory/dynamic_symmetric -I ../MOM6/src/framework -c $< -o $@
-
-test: $(TARGET)
+test:
 	python test.py
-
-clean:
-	 rm -f *.o *.mod *.MOD libRemap.a ../MOM6/src/framework/*.o ../MOM6/src/core/*.o ../MOM6/src/ALE/*.o

README.md

@@ -7,7 +7,7 @@ Instructions
 ```
 git submodule init
 git submodule update
-make
+make install
 ```
 
 # Testing the install

meson.build

@@ -0,0 +1,83 @@
+project('pyRemapping', ['c', 'fortran'],
+  version: '1.2.4',
+  default_options: [
+    'buildtype=release',
+    'warning_level=0',
+    'fortran_std=legacy',
+  ],
+)
+
+py = import('python').find_installation(pure: false)
+py_dep = py.dependency()
+
+# Locate numpy and f2py include directories at configure time
+incdir_numpy = run_command(py,
+  ['-c', 'import numpy; print(numpy.get_include())'],
+  check: true,
+).stdout().strip()
+
+incdir_f2py = run_command(py,
+  ['-c', 'import numpy.f2py; print(numpy.f2py.get_include())'],
+  check: true,
+).stdout().strip()
+
+numpy_inc = include_directories(incdir_numpy)
+f2py_inc  = include_directories(incdir_f2py)
+
+# Fortran flags matching the original Makefile
+add_project_arguments(
+  [
+    '-fdefault-real-8',
+    '-fno-second-underscore',
+    '-fbacktrace',
+    '-fno-align-commons',
+    '-fbounds-check',
+  ],
+  language: 'fortran',
+)
+
+# Header/module include paths required by MOM6 sources
+fortran_inc = include_directories(
+  '../MOM6/config_src/memory/dynamic_symmetric',
+  '../MOM6/src/framework',
+)
+
+# All supporting Fortran sources (deduplicated from Makefile SRCS)
+remap_srcs = files(
+  'MOM_io.F90',
+  'MOM_error_handler.F90',
+  '../MOM6/src/ALE/polynomial_functions.F90',
+  '../MOM6/src/framework/MOM_string_functions.F90',
+  '../MOM6/src/ALE/regrid_solvers.F90',
+  '../MOM6/src/ALE/regrid_edge_values.F90',
+  '../MOM6/src/ALE/regrid_consts.F90',
+  '../MOM6/src/ALE/P1M_functions.F90',
+  '../MOM6/src/ALE/PCM_functions.F90',
+  '../MOM6/src/ALE/P3M_functions.F90',
+  '../MOM6/src/ALE/PLM_functions.F90',
+  '../MOM6/src/ALE/PPM_functions.F90',
+  '../MOM6/src/ALE/PQM_functions.F90',
+  '../MOM6/src/ALE/regrid_interp.F90',
+  '../MOM6/src/ALE/MOM_remapping.F90',
+)
+
+# Generate the f2py C and Fortran wrapper sources from the interface file
+remap_f2py = custom_target('remap_f2py',
+  input: 'remap.f90',
+  output: ['remapmodule.c', 'remap-f2pywrappers2.f90'],
+  command: [
+    py, '-m', 'numpy.f2py',
+    '@INPUT@',
+    '-m', 'remap',
+    '--lower',
+    '--build-dir', '@OUTDIR@',
+  ],
+)
+
+# Build the Python extension module
+py.extension_module('remap',
+  sources: [remap_f2py, incdir_f2py / 'fortranobject.c', 'remap.f90'] + remap_srcs,
+  include_directories: [numpy_inc, f2py_inc, fortran_inc],
+  dependencies: [py_dep],
+  install: true,
+)

pyproject.toml

@@ -0,0 +1,19 @@
+[build-system]
+requires = [
+    "meson>=1.1.0",
+    "meson-python>=0.13.0",
+    "ninja",
+    "numpy>=1.19",
+]
+build-backend = "mesonpy"
+
+[project]
+name = "pyRemapping"
+version = "1.2.4"
+description = ""
+authors = [
+    {name = "Matthew Harrison", email = "matthew.harrison@noaa.gov"},
+]
+license = {text = "CCL"}
+requires-python = ">=3.9"
+dependencies = ["numpy>=1.19"]