Optional check and update of numpy.i file if outdated

Makefile.am

@@ -213,6 +213,8 @@ $(pytrexio_c): $(ORG_FILES) $(trexio_h) $(pytrexio_i) $(numpy_i)
 $(numpy_i):
 	wget https://raw.githubusercontent.com/numpy/numpy/main/tools/swig/numpy.i -O $(numpy_i) 
 
+check-numpy:
+	cd tools && ./check_numpy_i.sh
 
 CLEANFILES += src/pytrexio_wrap.c \
 	      src/pytrexio.py \
@@ -220,7 +222,7 @@ CLEANFILES += src/pytrexio_wrap.c \
 	      python/src/*.c \
 	      python/src/*.h
 
-.PHONY: cppcheck python-test python-install
+.PHONY: cppcheck python-test python-install check-numpy
 
 endif
 

tools/check_numpy_i.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+# Check that script is executed from tools directory
+if [[ $(basename $PWD) != "tools" ]] ; then
+  echo "This script should run in the tools directory"
+  exit -1
+fi
+
+TREXIO_ROOT=$(dirname "${PWD}../")
+
+#   First define readonly global variables.
+readonly SRC=${TREXIO_ROOT}/src
+readonly TOOLS=${TREXIO_ROOT}/tools
+
+# We want the script to crash on the 1st error:
+set -e
+
+NUMPY_SRC=${SRC}/numpy.i
+NUMPY_LATEST=${TOOLS}/numpy.i
+
+# Download the latest numpy.i file from NumPy GitHub
+wget https://raw.githubusercontent.com/numpy/numpy/main/tools/swig/numpy.i -O ${NUMPY_LATEST}
+
+# Execute diff to check if the numpy.i file in the src/ directory is updated
+if ! diff -q ${NUMPY_LATEST} ${NUMPY_SRC}  &>/dev/null; then
+  >&2 echo "numpy.i SWIG interface file in the source tree is outdated; replacing ..."
+  mv ${NUMPY_LATEST} ${NUMPY_SRC}
+else
+  >&2 echo "numpy.i SWIG interface file in the source tree is up-to-date."
+  rm ${NUMPY_LATEST}
+fi
+