MacOS .app file bundle resource files handler code.

Make MacOS Bundle Resource Files.cmake

# For multiple resources
file(GLOB_RECURSE YOUR_VARIABLE_NAME "relative/path/to/files/folder/* or *.filetype")

# * grabs everything within the directory
# *.filetype grabs everything with has a certain filetype

# Create .app executable
add_executable(	${PROJECT_NAME} MACOSX_BUNDLE 
		./src/main.cpp ./src/somefile.h
		${YOUR_VARIABLE_NAME})
				

foreach(VARIABLE_NAME ${YOUR_VARIABLE_NAME})

	# Get the folder and the file name
	file(RELATIVE_PATH RES_PATH_NAME"${CMAKE_CURRENT_SOURCE_DIR}" ${VARIABLE_NAME})
  
	# keep only the name of the folder
	get_filename_component(NEW_FILE_PATH_NAME ${RES_PATH_NAME} DIRECTORY)

	# Add current file and directory to the resources folder
	set_property(SOURCE ${VARIABLE_NAME} PROPERTY MACOSX_PACKAGE_LOCATION "Resources/${NEW_FILE_PATH_NAME}")

endforeach(VARIABLE_NAME)

# For one resource file
file(GLOB VARIABLE_NAME "path/to/file.filetype")

# Create .app executabled
add_executable(	${PROJECT_NAME} MACOSX_BUNDLE 
								./src/main.cpp ./src/somefile.h
								${YOUR_VARIABLE_NAME}})

# Add single file and directory to the resources folder
file(RELATIVE_PATH GET_REL_PATH_NAME "${CMAKE_CURRENT_SOURCE_DIR}" ${VARIABLE_NAME} )
get_filename_component(FILE_PATH_NAME "${GET_REL_PATH_NAME}" DIRECTORY)
set_property(SOURCE "${VARIABLE_NAME}" PROPERTY MACOSX_PACKAGE_LOCATION "Resources/${FILE_PATH_NAME}")