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function(ExternalSource_Download PREFIX URL)
get_filename_component(FILENAME ${URL} NAME)
set(CACHE_DIR "${CMAKE_SOURCE_DIR}/externals")
set(OUT_DIR "${CACHE_DIR}/${PREFIX}")
set(TMP_DIR "${CACHE_DIR}/${PREFIX}-tmp")
set(DOWNLOAD_PATH "${CACHE_DIR}/${PREFIX}-${FILENAME}")
set(STAMP_PATH "${CACHE_DIR}/${PREFIX}.stamp")
if(NOT EXISTS "${CACHE_DIR}")
file(MAKE_DIRECTORY "${CACHE_DIR}")
endif(NOT EXISTS "${CACHE_DIR}")
# TODO Check MD5 for correctness
set(MATCH_URL FALSE)
if(EXISTS "${STAMP_PATH}")
file(READ "${STAMP_PATH}" SAVED_URL)
if("${SAVED_URL}" STREQUAL "${URL}")
set(MATCH_URL TRUE)
endif("${SAVED_URL}" STREQUAL "${URL}")
endif(EXISTS "${STAMP_PATH}")
if(NOT EXISTS "${STAMP_PATH}" OR NOT EXISTS "${OUT_DIR}" OR NOT MATCH_URL)
file(REMOVE_RECURSE "${OUT_DIR}")
file(REMOVE_RECURSE "${TMP_DIR}")
file(MAKE_DIRECTORY "${TMP_DIR}")
message("-- Download ${PREFIX} from ${URL}")
file(DOWNLOAD ${URL} "${DOWNLOAD_PATH}")
message("-- Download ${PREFIX} from ${URL} - done")
message("-- Extract ${PREFIX}")
execute_process(COMMAND ${CMAKE_COMMAND} -E tar xfz "${DOWNLOAD_PATH}"
WORKING_DIRECTORY "${TMP_DIR}")
file(REMOVE "${DOWNLOAD_PATH}")
message("-- Extract ${PREFIX} - done")
message("-- Cleanup ${PREFIX}")
file(GLOB contents "${TMP_DIR}/*")
list(LENGTH contents n)
if(NOT n EQUAL 1 OR NOT IS_DIRECTORY "${contents}")
set(contents "${TMP_DIR}")
endif()
get_filename_component(contents ${contents} ABSOLUTE)
file(RENAME ${contents} "${OUT_DIR}")
file(REMOVE_RECURSE "${TMP_DIR}")
file(WRITE "${STAMP_PATH}" "${URL}")
message("-- Cleanup ${PREFIX} - done")
endif()
set(${PREFIX}_SOURCE_DIR "${OUT_DIR}" PARENT_SCOPE)
endfunction(ExternalSource_Download)
set(ExternalSourceTools_FOUND TRUE)
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