bundle_helper.rb

require 'find'
module BundleHelper

  # Use this to indicate the local name of a js lib, and a publicly hosted one. The local (unminimized) will be included in development mode, and the public one used for production
  #
  # Examples:
  #
  #     != javascript_dev ['jquery-1.4.1', 'http://ajax.googleapis.com/ajax/libs/jquery/1.4.1/jquery.min.js']
  #     != javascript_dev ['jquery-ui', 'http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.2/jquery-ui.min.js']
  #
  def javascript_dev(*sources)
    output = ""
    sources = sources.to_a
    sources.each do |pair|
      output << javascript_src_tag(Rails.env == 'development' ? "dev/#{pair[0]}" : pair[1], {})
    end
    output
  end

  #  This will include every file under 'public/javascript/{source}/*'. In development mode, it will have one <script> tag per file. In production, it will have one script tag for 'public/javascript/{source}.js'
  #
  #  Example:
  #
  #     != javascript_bundle 'common'
  #
  def javascript_bundle(*sources)
    sources = sources.to_a
    bundle_files? ? javascript_include_bundles(sources) : javascript_include_files(sources)
  end

  # This method assumes you have manually bundled js using a rake command
  # or similar. So there better be bundle_* files.
  def javascript_include_bundles(bundles)
    output = ""
    bundles.each do |bundle|
      output << javascript_src_tag("bundle_#{bundle}", {}) + "\n"
    end
    output
  end

  def javascript_include_files(bundles)
    output = ""
    bundles.each do |bundle|
      files = recursive_file_list("public/javascripts/#{bundle}", ".js")
      files.each do |file|
        file = file.gsub('public/javascripts/', '')
        output << javascript_src_tag(file, {}) + "\n"
      end
    end
    output
  end

  def bundle_files?
    Rails.env == 'production' || Rails.env == 'staging' || params[:bundle] || cookies[:bundle] == "yes"
  end

  def recursive_file_list(basedir, extname)
    Dir["#{basedir}/**/*#{extname}"]
  end

end