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edulan/Balanced image directories

Created April 10, 2010 15:28
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Balanced image directories
# Make balanced image directories to improve file system search
#
# Example:
#
# make_balanced_dirs(2, 4)
# ac3294f2b0174ee1.jpg -> ac329/4f2b/ac3294f2b0174ee1.jpg
#
def make_balanced_dirs levels, length
Dir.glob("*.jpg").collect do |f|
f.split('.')[0].gsub(/[a-f0-9]{lenght}/) { |m| File.join(m,'') }[0..(levels*length)+1].concat(f)
end
end
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