class Diffy::HtmlFormatter

def highlighted_words
  chunks = @diff.each_chunk.
    reject{|c| c == '\ No newline at end of file'"\n"}
  processed = []
  lines = chunks.each_with_index.map do |chunk1, index|
    next if processed.include? index
    processed << index
    chunk1 = chunk1
    chunk2 = chunks[index + 1]
    if not chunk2
      next ERB::Util.h(chunk1)
    end
    dir1 = chunk1.each_char.first
    dir2 = chunk2.each_char.first
    case [dir1, dir2]
    when ['-', '+']
      if chunk1.each_char.take(3).join("") =~ /^(---|\+\+\+|\\\\)/ and
          chunk2.each_char.take(3).join("") =~ /^(---|\+\+\+|\\\\)/
        ERB::Util.h(chunk1)
      else
        line_diff = Diffy::Diff.new(
                                    split_characters(chunk1),
                                    split_characters(chunk2),
                                    Diffy::Diff::ORIGINAL_DEFAULT_OPTIONS
                                    )
        hi1 = reconstruct_characters(line_diff, '-')
        hi2 = reconstruct_characters(line_diff, '+')
        processed << (index + 1)
        [hi1, hi2]
      end
    else
      ERB::Util.h(chunk1)
    end
  end.flatten
  lines.map{|line| line.each_line.map(&:chomp).to_a if line }.flatten.compact.
    map{|line|wrap_line(line) }.compact
end