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function(download_unicode_blocks)
set(default_url "https://unicode.org/Public/UNIDATA/Blocks.txt")
set(UNICODE_BLOCKS "UNICODE_BLOCKS-NOTFOUND" CACHE FILEPATH "Unicode blocks file")
option(CHECK_UNICODE_CERT "Check certificate while downloading Unicode blocks file" ON)
if(NOT UNICODE_BLOCKS_URL)
set(UNICODE_BLOCKS_URL "${default_url}")
endif()
if(NOT UNICODE_BLOCKS)
set(download_dest "${CMAKE_BINARY_DIR}/Blocks.txt")
message(STATUS "Downloading ${UNICODE_BLOCKS_URL}...")
file(DOWNLOAD
"${UNICODE_BLOCKS_URL}"
"${download_dest}"
SHOW_PROGRESS
STATUS status
TLS_VERIFY ${CHECK_UNICODE_CERT})
list(GET status 0 err)
if(err)
list(GET status 1 msg)
message(FATAL_ERROR "Download failed (${err}): ${msg}")
endif()
set(UNICODE_BLOCKS "${download_dest}" CACHE FILEPATH "Unicode blocks file" FORCE)
endif()
if(NOT EXISTS "${UNICODE_BLOCKS}")
set(UNICODE_BLOCKS "UNICODE_BLOCKS-NOTFOUND" CACHE FILEPATH "Unicode blocks file" FORCE)
message(FATAL_ERROR "Unicode blocks file not found. "
"Use -DUNICODE_BLOCKS=<path> or -DUNICODE_BLOCKS_URL=<url> to specify location of this file.\n"
"Blocks.txt file is available at the Unicode web site: ${default_url}")
endif()
endfunction()
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