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set(dep_root "${IS_UTF8_SOURCE_DIR}/dependencies/.cache")
if(DEFINED ENV{IS_UTF8_DEPENDENCY_CACHE_DIR})
set(dep_root "$ENV{IS_UTF8_DEPENDENCY_CACHE_DIR}")
endif()
function(import_dependency NAME GITHUB_REPO COMMIT)
message(STATUS "Importing ${NAME} (${GITHUB_REPO}@${COMMIT})")
set(target "${dep_root}/${NAME}")
# If the folder exists in the cache, then we assume that everything is as
# should be and do nothing
if(EXISTS "${target}")
set("${NAME}_SOURCE_DIR" "${target}" PARENT_SCOPE)
return()
endif()
set(zip_url "https://github.com/${GITHUB_REPO}/archive/${COMMIT}.zip")
set(archive "${dep_root}/archive.zip")
set(dest "${dep_root}/_extract")
file(DOWNLOAD "${zip_url}" "${archive}")
file(MAKE_DIRECTORY "${dest}")
execute_process(
WORKING_DIRECTORY "${dest}"
COMMAND "${CMAKE_COMMAND}" -E tar xf "${archive}")
file(REMOVE "${archive}")
# GitHub archives only ever have one folder component at the root, so this
# will always match that single folder
file(GLOB dir LIST_DIRECTORIES YES "${dest}/*")
file(RENAME "${dir}" "${target}")
set("${NAME}_SOURCE_DIR" "${target}" PARENT_SCOPE)
endfunction()
# Delegates to the dependency
macro(add_dependency NAME)
if(NOT DEFINED "${NAME}_SOURCE_DIR")
message(FATAL_ERROR "Missing ${NAME}_SOURCE_DIR variable")
endif()
add_subdirectory("${${NAME}_SOURCE_DIR}" "${PROJECT_BINARY_DIR}/_deps/${NAME}")
endmacro()
function(set_off NAME)
set("${NAME}" OFF CACHE INTERNAL "")
endfunction()
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