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function(parse_git_tag WORKING_DIR OUTPUT_MAJOR OUTPUT_MINOR OUTPUT_PATCH)
# Check if we're in a git repo
execute_process(
COMMAND git rev-parse --git-dir
WORKING_DIRECTORY ${WORKING_DIR}
OUTPUT_VARIABLE _git_dir
OUTPUT_STRIP_TRAILING_WHITESPACE
ERROR_QUIET
)
if(_git_dir)
# Get the latest version tag reachable from the current commit
execute_process(
COMMAND git describe --tags --abbrev=0
--match "[0-9]*.[0-9]*.[0-9]*"
WORKING_DIRECTORY ${WORKING_DIR}
OUTPUT_VARIABLE _latest_tag
OUTPUT_STRIP_TRAILING_WHITESPACE
ERROR_QUIET
)
if(_latest_tag MATCHES "^([0-9]+)\\.([0-9]+)\\.([0-9]+)$")
set(_major "${CMAKE_MATCH_1}")
set(_minor "${CMAKE_MATCH_2}")
set(_patch "${CMAKE_MATCH_3}")
message(STATUS "Version from git tag: ${_latest_tag}")
else()
string(ASCII 27 _esc)
set(_W "${_esc}[38;5;208m")
set(_R "${_esc}[0m")
message(STATUS "${_W}WARNING: No version tags found. "
"Try: git fetch --tags${_R}")
endif()
elseif(EXISTS "${WORKING_DIR}/VERSION")
# Not a git repo, try VERSION file (release tarball / git archive)
file(READ "${WORKING_DIR}/VERSION" _ver)
string(STRIP "${_ver}" _ver)
if(_ver MATCHES "^([0-9]+)\\.([0-9]+)\\.([0-9]+)")
set(_major "${CMAKE_MATCH_1}")
set(_minor "${CMAKE_MATCH_2}")
set(_patch "${CMAKE_MATCH_3}")
message(STATUS "Version from VERSION file: ${_ver}")
endif()
endif()
if(NOT DEFINED _major)
set(_major "0")
set(_minor "0")
set(_patch "0")
endif()
set(${OUTPUT_MAJOR} "${_major}" PARENT_SCOPE)
set(${OUTPUT_MINOR} "${_minor}" PARENT_SCOPE)
set(${OUTPUT_PATCH} "${_patch}" PARENT_SCOPE)
endfunction()
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