vcpkg/scripts/cmake/vcpkg_extract_source_archive.cmake

## # vcpkg_extract_source_archive
##
## Extract an archive into the source directory. Deprecated in favor of [`vcpkg_extract_source_archive_ex`](vcpkg_extract_source_archive_ex.md).
##
## ## Usage
## ```cmake
## vcpkg_extract_source_archive(
##     <${ARCHIVE}> [<${TARGET_DIRECTORY}>]
## )
## ```
## ## Parameters
## ### ARCHIVE
## The full path to the archive to be extracted.
##
## This is usually obtained from calling [`vcpkg_download_distfile`](vcpkg_download_distfile.md).
##
## ### TARGET_DIRECTORY
## If specified, the archive will be extracted into the target directory instead of `${CURRENT_BUILDTREES_DIR}\src\`.
##
## This can be used to mimic git submodules, by extracting into a subdirectory of another archive.
##
## ## Notes
## This command will also create a tracking file named <FILENAME>.extracted in the TARGET_DIRECTORY. This file, when present, will suppress the extraction of the archive.
##
## ## Examples
##
## * [libraw](https://github.com/Microsoft/vcpkg/blob/master/ports/libraw/portfile.cmake)
## * [protobuf](https://github.com/Microsoft/vcpkg/blob/master/ports/protobuf/portfile.cmake)
## * [msgpack](https://github.com/Microsoft/vcpkg/blob/master/ports/msgpack/portfile.cmake)
include(vcpkg_execute_required_process)

function(vcpkg_extract_source_archive ARCHIVE)
    if(NOT ARGC EQUAL 2)
        set(WORKING_DIRECTORY "${CURRENT_BUILDTREES_DIR}/src")
    else()
        set(WORKING_DIRECTORY ${ARGV1})
    endif()

    get_filename_component(ARCHIVE_FILENAME "${ARCHIVE}" NAME)
    if(NOT EXISTS ${WORKING_DIRECTORY}/${ARCHIVE_FILENAME}.extracted)
        message(STATUS "Extracting source ${ARCHIVE}")
        file(MAKE_DIRECTORY ${WORKING_DIRECTORY})
        vcpkg_execute_required_process(
            ALLOW_IN_DOWNLOAD_MODE
            COMMAND ${CMAKE_COMMAND} -E tar xjf ${ARCHIVE}
            WORKING_DIRECTORY ${WORKING_DIRECTORY}
            LOGNAME extract
        )
        file(WRITE ${WORKING_DIRECTORY}/${ARCHIVE_FILENAME}.extracted)
    endif()
endfunction()