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# SPDX-FileCopyrightText: 2022 Graeme Gott <graeme@gottcode.org>
#
# SPDX-License-Identifier: GPL-3.0-or-later
function(add_version_compile_definition versionstr_file versionstr_def)
find_package(Git QUIET)
if(Git_FOUND)
# Find git repository
execute_process(
COMMAND ${GIT_EXECUTABLE} rev-parse --absolute-git-dir
WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
RESULT_VARIABLE git_dir_result
OUTPUT_VARIABLE git_dir
ERROR_QUIET
OUTPUT_STRIP_TRAILING_WHITESPACE
)
if (git_dir_result EQUAL 0)
# Find version number from git
execute_process(
COMMAND ${GIT_EXECUTABLE} describe --tags --match "v*"
WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
OUTPUT_VARIABLE versionstr
ERROR_QUIET
OUTPUT_STRIP_TRAILING_WHITESPACE
)
string(REGEX REPLACE "^v" "" versionstr "${versionstr}")
# Rerun CMake when git repository changes
if (EXISTS ${git_dir}/logs/HEAD)
set_property(
DIRECTORY
APPEND
PROPERTY CMAKE_CONFIGURE_DEPENDS ${git_dir}/logs/HEAD
)
endif()
endif()
endif()
# Fall back to project's VERSION
if ("${versionstr}" STREQUAL "")
set(versionstr ${PROJECT_VERSION})
endif()
# Pass version as compile definition to file
set_property(
SOURCE ${versionstr_file}
APPEND
PROPERTY COMPILE_DEFINITIONS ${versionstr_def}="${versionstr}"
)
endfunction()
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