Question

How can I use nokogiri to replace all img tags with image tags? This is to utilize Rails’ ability to plugin the correct asset server automatically?

require 'nokogiri'

class ToImageTag

  def self.convert
    Dir.glob("app/views/**/*").each do |filename|
      doc = Nokogiri::HTML(File.open(filename))
      doc.xpath("//img").each |img_tags|
        # grab the src and all the attributes and move them to ERB
      end

    # rewrite the file
    end

  rescue => err
    puts "Exception: #{err}"
  end

end

Answer 1

Somewhat inspired by maerics’ response, I’ve created a script that does this. It doesn’t have an issue with HTML entities because it only uses the nokogiri output as a guide for replacement. The actual replacement is done by using String#gsub!

https://gist.github.com/1254319