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if (GIT_EXECUTABLE)
# refresh git index
execute_process(COMMAND ${GIT_EXECUTABLE} update-index -q --refresh
WORKING_DIRECTORY ${TOP_SOURCE_DIR} TIMEOUT 5 OUTPUT_QUIET
ERROR_VARIABLE EXEC_ERR OUTPUT_STRIP_TRAILING_WHITESPACE
)
#later use git describe here
execute_process( COMMAND ${GIT_EXECUTABLE} rev-parse --short HEAD
WORKING_DIRECTORY ${TOP_SOURCE_DIR}
OUTPUT_VARIABLE THIS_GIT_ID OUTPUT_STRIP_TRAILING_WHITESPACE)
execute_process( COMMAND ${GIT_EXECUTABLE} diff-index --name-only HEAD
WORKING_DIRECTORY ${TOP_SOURCE_DIR}
OUTPUT_VARIABLE _HAS_CHANGES OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET)
if (NOT "${_HAS_CHANGES}" STREQUAL "")
set(THIS_GIT_ID "${THIS_GIT_ID} (dirty)")
endif()
message("Current git revision is ${THIS_GIT_ID}")
set(THIS_GIT_ID "gitid: ${THIS_GIT_ID}")
else()
set (THIS_GIT_ID)
endif()
file(READ ${INPUT} CONTENT)
string(REGEX REPLACE "#VOTCA_GIT_ID#" "${THIS_GIT_ID}" NEW_CONTENT "${CONTENT}")
string(RANDOM TMP)
while(EXISTS ${OUTPUT}.${TMP})
string(RANDOM TMP)
endwhile()
file(WRITE "${OUTPUT}.${TMP}" "${NEW_CONTENT}")
execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different ${OUTPUT}.${TMP} ${OUTPUT})
execute_process(COMMAND ${CMAKE_COMMAND} -E remove ${OUTPUT}.${TMP})
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