CoffeeScript + Jim bundles / Guard

Guardfile

guard 'coffeescript', :output => 'app/javascripts', :wrap => false, :shallow => false do
  watch('^app/coffeescripts/(.*)\.coffee')
end

def jimify(bundles, why = nil)
  bundles = Array(bundles)
  message = "Jim bundle & compress (bundles: #{bundles.join(", ")})"
  message += " due to #{why} change" if why
  puts message
  # just bundle them first, so that livereload happens faster
  bundles.each { |name| puts %x[ jim bundle #{name} --force ] }
  # compress to a different path, so that the bundled (development source) can be .gitignored
  bundles.each { |name| puts %x[ jim compress #{name} --force --bundle-dir=public/javascripts] }
end

# convention over configuration: returns the names of all bundles without the "vendor" one
# TODO: check if Jim has a method for getting the list of bundles, otherwise extract from the Jimfile
def bundles
  names = []
  Dir.chdir(File.dirname(__FILE__) + '/app/javascripts') do
    Dir.glob("*") do |name|
      names << name if File.directory?(name) && name != "shared"
    end
  end
  names
end

guard 'shell' do
  # vendored libs go to a separate bundle for performance reasons (faster development)
  watch('^public/javascripts/vendor/.+\.js$') do |m|
    jimify "vendor", m[0]
  end
  # javascript bundles source files are contained in a directory named after the bundle
  watch('^app/javascripts/(.+)/.+\.js$') do |m|
    if m[1] != "shared"
      jimify m[1], m[0]
    else
      # shared across bundles code is faster to compress when bundle "vendor" is excluded
      # all bundles have a corresponding dir in app/javascripts (the only extra dir being "shared")
      # ideally, there could be a $ jim bundle / compress --exclude-bundles=list
      jimify bundles, m[0]
    end
  end
end

Jimfile

{ "bundle_dir": "public/javascripts/bundle"
, "vendor_dir": "public/javascripts/vendor"
, "bundles":
      { "vendor":
        [ "underscore"
        , "jquery"
        ]
      , "development":
        [ "jquery.lint"
        , "app/javascripts/development/lint"
        ]
      , "master":
        [ "app/javascripts/shared/tardis"
        , "app/javascripts/master/app"
        ]
      }
, "compressor": "yui"
}