Rewrite history to move files from the root of the project into sub dir

git_move_file_history.rb

files = Dir.entries(".")
sub_dir = "clowns_as_many"

(files - [".", "..", ".git", ".gitignore", "lib", ".DS_Store", "move.rb"]).each do |file|
         cmd = "git filter-branch -f --tree-filter \'if [ -e #{file} ]; then mkdir -p #{sub_dir} && mv #{file} #{sub_dir}/; fi\' HEAD"
         p cmd
         system cmd
end

This is to move all files except those in the blacklist from the root dir to the dir clowns_as_many