class DiffyC32

# File lib/diffyc32.rb, line 13
def initialize(s1, s2)
  
  html = Diffy::Diff.new(s1, s2).to_s(:html)

  doc = Rexle.new(html)
  a = doc.root.xpath('ul/li/*')
  a2 = a.map do |e|
    txt = case e.name.to_sym
    when :del
      if e.text('strong').to_s =~ /^\s+$/ then
        colour_strong(e, :bg_gray)
      else
        colour_strong(e, :red)          
      end
      ' - '.red + ' ' + e.plaintext        
    when :ins
      puts e.text('strong').to_s.inspect
      if e.text('strong').to_s =~ /^\s+$/ then
        colour_strong(e, :bg_green)
      else
        colour_strong(e) {|x| x.light_green}          
      end
      ' + '.green + ' ' + e.plaintext        
      
    when :span
      '   ' + ' ' + e.plaintext
    else
      '   ' + ' ' + e.plaintext
    end      
  end

  @s =  a2.join("\n")
end

# File lib/diffyc32.rb, line 47
def to_s()
  @s
end

# File lib/diffyc32.rb, line 53
def colour_strong(e, colour=:magenta)

  # check for strong element
  strong = e.element('strong')

  if strong then

    strong.text = if block_given? then
      yield(strong.text.to_s)
    else
      strong.text.to_s.send(colour.to_sym)
    end

  end
  
end