1.md

Google closure JavaScript minifier

Super cheapo (and super effective!) minification.

Usage:

In Ruby:

code = 'alert("hello there");'

GoogleClosure.minify(code)

Or through the shell:

cat script.js | ruby google_closure.rb > script.min.js

Or minify many files in one go:

# Rakefile
task :minify do
  require 'google_closure'
  files  = Dir['public/js/jquery.*.js']
  files += Dir['public/js/app.*.js']

  combined = files.map { |fn| File.open(fn) { |f| f.read } }.join("\n")
  minified = GoogleClosure.minify(combined)

  File.open('public/js/script.min.js', 'w') { |f| f << minified }        
end

google_closure.rb

require 'rest_client'

module GoogleClosure
  extend self

  URL = "http://closure-compiler.appspot.com/compile"

  def minify(code, options={})
    defaults = {
        :js_code => code,
        :compilation_level => 'ADVANCED_OPTIMIZATIONS',
        :output_format => 'text',
        :output_info => 'compiled_code'
      }

    RestClient.post URL, defaults.merge(options)
  end
end

if $0 == __FILE__
  puts GoogleClosure.minify($stdin.read)
end