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# Function that returns the last git tag matching the prefix passed as parameter
# tag name if you are exactly on (annotated) tag,
# or <tag>-<n>-g<shortened sha-1> if not
# where <n> is number of commits since <tag>
function(get_last_git_tag PREFIX)
if(PREFIX)
execute_process(
COMMAND git describe --tags --match "${PREFIX}*"
WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
OUTPUT_VARIABLE LAST_TAG
OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET
)
# if the prefix does not succeed, try lower case
string(TOLOWER ${PREFIX} LOWER_CASE_PREFIX)
if(NOT LAST_TAG)
execute_process(
COMMAND git describe --tags --match "${LOWER_CASE_PREFIX}*"
WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
OUTPUT_VARIABLE LAST_TAG
OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET
)
endif()
if(LAST_TAG)
string(TOLOWER ${LAST_TAG} LOWER_CASE_LAST_TAG)
string(REPLACE "${LOWER_CASE_PREFIX}/" "" LAST_TAG ${LOWER_CASE_LAST_TAG})
endif()
endif()
# if the prefix does not succeed, default to the last tag matching a strictly numerical scheme
if(NOT LAST_TAG)
execute_process(
COMMAND git describe --tags --match "[0-9]*"
WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
OUTPUT_VARIABLE LAST_TAG
OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET
)
endif()
# Well, we found nothing... In this case, we just use the last commit hash
if(NOT LAST_TAG)
execute_process(
COMMAND git describe --always
WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
OUTPUT_VARIABLE LAST_TAG
OUTPUT_STRIP_TRAILING_WHITESPACE
)
endif()
set(GIT_TAG ${LAST_TAG} PARENT_SCOPE)
endfunction()
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