class Test::Unit::AutoRunner

def keyword_display(keywords)
  keywords = keywords.collect do |keyword, _|
    keyword.to_s
  end.uniq.sort
  i = 0
  keywords.collect do |keyword|
    if (i > 0 and keyword[0] == keywords[i - 1][0]) or
        ((i < keywords.size - 1) and (keyword[0] == keywords[i + 1][0]))
      n = 2
    else
      n = 1
    end
    i += 1
    keyword.sub(/^(.{#{n}})([A-Za-z-]+)(?=\w*$)/, '\\1[\\2]')
  end.join(", ")
end