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# File 'lib/nanoc3/filters/relativize_paths.rb', line 9

def run(content, params={})
  # Set assigns so helper function can be used
  @item_rep = assigns[:item_rep] if @item_rep.nil?

  # Filter
  case params[:type]
  when :html
    content.gsub(/(src|href)=(['"]?)(\/.+?)\2([ >])/) do
      $1 + '=' + $2 + relative_path_to($3) + $2 + $4
    end
  when :css
    content.gsub(/url\((['"]?)(\/.+?)\1\)/) do
      'url(' + $1 + relative_path_to($2) + $1 + ')'
    end
  else
    raise RuntimeError.new(
      "The relativize_paths needs to know the type of content to " +
      "process. Pass :type => :html for HTML or :type => :css for CSS."
    )
  end
end