GetSubdirectoryFiles.h

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get_subdirectoryfiles(){ Path Filenames)
  set(Filenames)
  file(GLOB children ${Path}/*)
 
  # continue process only if there is some file to process
  if (children)
    # create the copy of children
    set(childrenSorted)
    foreach(FILENAME ${children})
      string(TOLOWER "${FILENAME}" filenameLower)
      # build a new variable (map) to associate the key filenameLower to the real filename FILENAME
      set("map_${filenameLower}" "${FILENAME}")
      # add the key to a specific list
      list(APPEND childrenSorted "${filenameLower}")
    endforeach()
    
    # sort the key list (all lowercase)
    list(SORT childrenSorted)
 
    # loop on all keys
    foreach(filenameLower ${childrenSorted})
      # get the filename from the lower case name
      set(realFilename ${map_${filenameLower}})
      if(NOT IS_DIRECTORY ${realFilename})
          set(${Filenames} ${${Filenames}} ${realFilename})
      endif()
    endforeach()
  endif()
end(){)