#!/usr/bin/env ruby

require 'rubygems'
require 'nokogiri'

class String
  def highlight(target)

    return self if (!self[/\b#{target}\b/])

    # To avoid stomping on strings embedded inside links we'll use Nokogiri to
    # parse the string into a DocumentFragment, then we'll look inside the text
    # of the fragment and highlight what we find there.

    html = Nokogiri::HTML::fragment(self.dup)
    html.traverse do |_node|
      (_node.text? && _node.text[ /\b#{ target }\b/ ]) or next

      puts "text node content: #{ _node.content }"

      replacement = _node.content.dup.gsub( /\b#{ target }\b/, "<b>#{ target }</b>" )
      puts "should see: #{ replacement }"

      _node.swap(replacement)
      # For double the fun, do it again for a bus error! WHEEEEEeeeeee!
      # _node.swap(replacement)
    end
    html.to_html
  end
end

text = "To avoid stomping on strings embedded inside links we'll use Nokogiri to"
puts "I'm getting: #{ text.highlight('stomping') }"