truncate in the middle like Finder

truncate_middle.rb

# If text is longer than +options[:length]+ (defaults to 30), text will be middle-truncated
# and the last characters will be replaced with the +options[:omission]+ (defaults to "...").
def truncate_middle(text, *args)
  options = args.extract_options!
  options.reverse_merge!(:length => 30, :omission => "...")
  
  if text
    if text.mb_chars.length <= options[:length]
      text
    else
      tl = options[:omission].mb_chars.length
      hl = (options[:length]-tl)/2
      text[0..hl] + options[:omission] + text[-hl..-1]
    end
  end
end