# Generates Source/GitVersion.h from Source/GitVersion.h.in using the current
# Git state and a fresh build timestamp. Invoked via `cmake -P` at build time.

execute_process(COMMAND git rev-parse HEAD
                WORKING_DIRECTORY ${SRC_DIR}
                OUTPUT_VARIABLE GIT_COMMIT
                OUTPUT_STRIP_TRAILING_WHITESPACE
                ERROR_QUIET)

if(NOT GIT_COMMIT)
    set(GIT_COMMIT "unknown")
endif()

execute_process(COMMAND git status --porcelain
                WORKING_DIRECTORY ${SRC_DIR}
                OUTPUT_VARIABLE GIT_STATUS
                OUTPUT_STRIP_TRAILING_WHITESPACE
                ERROR_QUIET)

if(GIT_STATUS STREQUAL "")
    set(GIT_DIRTY 0)
else()
    set(GIT_DIRTY 1)
endif()

string(TIMESTAMP BUILD_DATE "%Y-%m-%d__%H-%M-%S")

configure_file(${TEMPLATE} ${OUTPUT} @ONLY)