class Middleman::Extensions::AssetHash::Middleware

def rewrite_paths(body, path)
  dirpath = Pathname.new(File.dirname(path))
  # TODO: This regex will change some paths in plan HTML (not in a tag) - is that OK?
  body.gsub(/([=\'\"\(]\s*)([^\s\'\"\)]+(#{@exts_regex_text}))/) do |match|
    opening_character = $1
    asset_path = $2
    relative_path = Pathname.new(asset_path).relative?
    asset_path = dirpath.join(asset_path).to_s if relative_path
    if @ignore.any? { |r| asset_path.match(r) }
      match
    elsif asset_page = @middleman_app.sitemap.find_resource_by_path(asset_path)
      replacement_path = "/#{asset_page.destination_path}"
      replacement_path = Pathname.new(replacement_path).relative_path_from(dirpath).to_s if relative_path
      "#{opening_character}#{replacement_path}"
    else
      match
    end
  end
end