What?

Compresses your main public javascript file, using uglifyjs and the uglifier gem when you save your source file.

Use

if you haven't already gem install uglifier
then gem install guard-uglify
in your project's directory root
guard init
guard init uglify

which will add this to your Guardfile

guard 'uglify', :input => 'app/assets/javascript/application.js', :output => "public/javascripts/application.js" do
  watch 'app/assets/javascripts/application.js'
end

The destination file will be compressed when the watched file changes. If you are using this with my guard-sprocketize gem, place the above guard block after the sprockets block in your Guardfile.

The base configuration would work for a rails 3 project with a directory structure like

|-- app
|   |-- controllers
|   |-- assets
|   |   |-- sass
|   |   `-- javascripts
|   |       `-- application.js # your source javascript file 
|   |-- helpers
|   |-- mailers
|   |-- models
|   `-- views
|       `-- layouts
|-- config
|   |-- environments
|   |-- initializers
|   `-- locales
|-- db
|-- doc
|-- lib
|   `-- tasks
...
|-- public
    `-- javascripts
        `-- application.js # file to be compressed
... etc.

TODO

tests

License

(The MIT License)

Copyright (c) 2011 Aaron Cruz

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.