cmake_minimum_required(VERSION 3.5)

#

# Create a single GRF file based on sprites/<grfname>.nfo and sprites/*.png

# files.

#

if (NOT NFORENUM_EXECUTABLE)

    message(FATAL_ERROR "Script needs NFORENUM_EXECUTABLE defined")

endif (NOT NFORENUM_EXECUTABLE)

if (NOT GRFCODEC_EXECUTABLE)

    message(FATAL_ERROR "Script needs GRFCODEC_EXECUTABLE defined")

endif (NOT GRFCODEC_EXECUTABLE)

if (NOT GRF_SOURCE_FOLDER)

    message(FATAL_ERROR "Script needs GRF_SOURCE_FOLDER defined")

endif (NOT GRF_SOURCE_FOLDER)

if (NOT GRF_BINARY_FILE)

    message(FATAL_ERROR "Script needs GRF_BINARY_FILE defined")

endif (NOT GRF_BINARY_FILE)

get_filename_component(GRF_SOURCE_FOLDER_NAME "${GRF_SOURCE_FOLDER}" NAME)

file(WRITE sprites/${GRF_SOURCE_FOLDER_NAME}.nfo "")

file(READ ${GRF_SOURCE_FOLDER}/${GRF_SOURCE_FOLDER_NAME}.nfo NFO_LINES)

# Replace ; with \;, and make a list out of this based on \n

string(REPLACE ";" "\\;" NFO_LINES "${NFO_LINES}")

string(REPLACE "\n" ";" NFO_LINES "${NFO_LINES}")

foreach(NFO_LINE IN LISTS NFO_LINES)

    # Recover the ; that was really in the text (and not a newline)

    string(REPLACE "\\;" ";" NFO_LINE "${NFO_LINE}")

    if (NFO_LINE MATCHES "^#include")

        string(REGEX REPLACE "^#include \"(.*)\"$" "\\1" INCLUDE_FILE ${NFO_LINE})

        file(READ ${GRF_SOURCE_FOLDER}/${INCLUDE_FILE} INCLUDE_LINES)

        file(APPEND sprites/${GRF_SOURCE_FOLDER_NAME}.nfo "${INCLUDE_LINES}")

    else (NFO_LINE MATCHES "^#include")

        file(APPEND sprites/${GRF_SOURCE_FOLDER_NAME}.nfo "${NFO_LINE}\n")

    endif (NFO_LINE MATCHES "^#include")

endforeach(NFO_LINE)

execute_process(COMMAND ${NFORENUM_EXECUTABLE} -s sprites/${GRF_SOURCE_FOLDER_NAME}.nfo)

execute_process(COMMAND ${GRFCODEC_EXECUTABLE} -n -s -e -p1 ${GRF_SOURCE_FOLDER_NAME}.grf)

execute_process(COMMAND ${CMAKE_COMMAND} -E copy ${GRF_SOURCE_FOLDER_NAME}.grf ${GRF_BINARY_FILE})