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MACRO(auto_add_subdir cur_dir)
    #ignore idea project configure dir
    file(GLOB children RELATIVE ${cur_dir} [^.]*)
    #set(dirlist "")
    foreach(child ${children})
        #sure it is dir and has cmakelist.txt file
        if(IS_DIRECTORY ${cur_dir}/${child} AND EXISTS ${cur_dir}/${child}/CMakeLists.txt)
            #list(APPEND dirlist ${child})
            add_subdirectory(${child})
        endif()
    endforeach()
endmacro()

#example
auto_add_subdir(${CMAKE_CURRENT_SOURCE_DIR})