Update CMakeLists.txt to place copy files required to build a wheel

mapscript/python/CMakeLists.txt

@@ -1,7 +1,6 @@
-FIND_PACKAGE(SWIG REQUIRED)
-INCLUDE(${SWIG_USE_FILE})
-FIND_PACKAGE(PythonInterp)
-
+find_package(SWIG REQUIRED)
+include(${SWIG_USE_FILE})
+find_package(PythonInterp)
 
 # Python library/header finding doesn't seem to honor the python
 # interpreter that was found beforehand, and defaults to the system
@@ -21,27 +20,39 @@ find_library(PYTHON_LIBRARIES
 
 #if that failed, fall back to the default cmake method of finding python dev files
 if(NOT PYTHON_INCLUDE_PATH OR NOT PYTHON_LIBRARIES)
-  FIND_PACKAGE(PythonLibs)
+  find_package(PythonLibs)
 endif(NOT PYTHON_INCLUDE_PATH OR NOT PYTHON_LIBRARIES)
 
-
-INCLUDE_DIRECTORIES(${PYTHON_INCLUDE_PATH})
+include_directories(${PYTHON_INCLUDE_PATH})
 include_directories(${PROJECT_SOURCE_DIR}/mapscript/swiginc)
 include_directories(${PROJECT_SOURCE_DIR}/mapscript/)
 include_directories(${PROJECT_SOURCE_DIR}/mapscript/python)
-SWIG_ADD_MODULE(pythonmapscript python ../mapscript.i)
 
-SWIG_LINK_LIBRARIES(pythonmapscript ${PYTHON_LIBRARIES} ${MAPSERVER_LIBMAPSERVER})
+swig_add_library(pythonmapscript TYPE MODULE LANGUAGE python SOURCES ../mapscript.i)
+swig_link_libraries(pythonmapscript ${PYTHON_LIBRARIES} ${MAPSERVER_LIBMAPSERVER})
 
 set_target_properties(${SWIG_MODULE_pythonmapscript_REAL_NAME} PROPERTIES PREFIX "")
 set_target_properties(${SWIG_MODULE_pythonmapscript_REAL_NAME} PROPERTIES OUTPUT_NAME _mapscript)
 
+execute_process (COMMAND ${PYTHON_EXECUTABLE} -c "from distutils.sysconfig import get_python_lib; print(get_python_lib(True))" OUTPUT_VARIABLE PYTHON_SITE_PACKAGES OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+set(SETUP_PY_IN "${PROJECT_SOURCE_DIR}/mapscript/python/setup.py.in")
+set(SETUP_PY_TEMP "${CMAKE_CURRENT_BINARY_DIR}/setup.py.temp")
+
+configure_file(${SETUP_PY_IN} ${SETUP_PY_TEMP} @ONLY)
+file(READ ${SETUP_PY_TEMP} SETUP_CONTENT)
+# each target (e.g. Debug, Release etc.) will have a copy of setup.py
+
+file(GENERATE OUTPUT $<TARGET_FILE_DIR:${SWIG_MODULE_pythonmapscript_REAL_NAME}>/setup.py INPUT ${SETUP_PY_TEMP})
 
-execute_process ( COMMAND ${PYTHON_EXECUTABLE} -c "from distutils.sysconfig import get_python_lib; print(get_python_lib(True))" OUTPUT_VARIABLE PYTHON_SITE_PACKAGES OUTPUT_STRIP_TRAILING_WHITESPACE)
+# copy all Python files to the output folder following build
+add_custom_command(TARGET ${SWIG_MODULE_pythonmapscript_REAL_NAME} POST_BUILD
+    COMMAND ${CMAKE_COMMAND} -E copy_directory "${PROJECT_SOURCE_DIR}/mapscript/python/mapscript" $<TARGET_FILE_DIR:${SWIG_MODULE_pythonmapscript_REAL_NAME}>/mapscript
+    COMMAND ${CMAKE_COMMAND} -E copy "${CMAKE_CURRENT_BINARY_DIR}/mapscript.py" $<TARGET_FILE_DIR:${SWIG_MODULE_pythonmapscript_REAL_NAME}>/mapscript/mapscript.py
+    COMMAND ${CMAKE_COMMAND} -E copy "$<TARGET_FILE:${SWIG_MODULE_pythonmapscript_REAL_NAME}>" "$<TARGET_FILE_DIR:${SWIG_MODULE_pythonmapscript_REAL_NAME}>/mapscript/$<TARGET_FILE_NAME:${SWIG_MODULE_pythonmapscript_REAL_NAME}>"
+    COMMAND ${CMAKE_COMMAND} -E copy_directory "${PROJECT_SOURCE_DIR}/mapscript/python/examples" $<TARGET_FILE_DIR:${SWIG_MODULE_pythonmapscript_REAL_NAME}>/mapscript/examples
+    )
 
-get_target_property(LOC_MAPSCRIPT_LIB ${SWIG_MODULE_pythonmapscript_REAL_NAME} LOCATION)
-set(mapscript_files ${LOC_MAPSCRIPT_LIB} ${CMAKE_CURRENT_BINARY_DIR}/mapscript.py)
+set(mapscript_files $<TARGET_FILE:${SWIG_MODULE_pythonmapscript_REAL_NAME}> $<TARGET_FILE_DIR:${SWIG_MODULE_pythonmapscript_REAL_NAME}>/mapscript/mapscript.py)
 install(FILES ${mapscript_files} DESTINATION ${PYTHON_SITE_PACKAGES})
 
-#install(FILES ${CMAKE_CURRENT_BINARY_DIR}/mapscript.py DESTINATION ${PYTHON_SITE_PACKAGES})
-#install(TARGETS mapscript DESTINATION ${PYTHON_SITE_PACKAGES})