assets.rake

namespace :assets do
  namespace :js do
    desc "Package JavaScript"
    task :package do
      puts "Packaging path.js..."
      repackage_javascript
    end

    namespace :package do
      task "pre-commit" do
        repackage_js = false

        modified_files = `git status -s`
        modified_files.split("\n").each do |file_status|
          if file_status =~ %r{^\w. app/javascripts/.*\.js\s*$}
            repackage_js = true
            break
          end
        end

        if repackage_js
          puts "JavaScript has been modified. Repackaging path.js..."
          repackage_javascript
          `git add #{Rails.root}/public/javascripts/path.js`
        end
      end
    end
  end

  task "git:pre-commit:append" do
    begin
      puts "Appending asset packaging logic to .git/hooks/pre-commit ..."

      if File.exists?(".git/hooks/pre-commit")
        precommit = File.read(".git/hooks/pre-commit")
        precommit.sub!(/exit 0\s*$/, '')
      else
        precommit = ""
      end

      File.open(".git/hooks/pre-commit", "w") do |file|
        file.puts precommit
        file.puts <<-TEXT
exec rake assets:pre-commit

exit 0
        TEXT
      end
      File.chmod(0755, ".git/hooks/pre-commit")
    rescue Errno::ENOENT
      abort "You have to run git init first!"
    end
  end

  namespace :css do
    namespace :package do
      task "pre-commit", :needs => [:environment] do
        puts "Regenerating style.css..."
        Sass::Plugin.options[:style] = :compressed
        Rake::Task['sass:sass2css'].execute
        `cd #{Rails.root} && git add -f #{Rails.root}/public/stylesheets/style.css`
      end
    end
  end

  task 'pre-commit' => ['assets:js:package:pre-commit', 'assets:css:package:pre-commit']

  def repackage_javascript
    closure_path = File.join(Rails.root, '/lib/closure_compiler.jar')
    uncompressed_js_file = File.join(Rails.root, '/public/sprockets.js')
    compressed_js_file = File.join(Rails.root, '/public/javascripts/path.js')

    `rake sprockets:install_script`
    `java -jar #{closure_path} --js #{uncompressed_js_file} --js_output_file #{compressed_js_file}`
    FileUtils.rm_f uncompressed_js_file
  end
end