jslint rake task

desc "Check the JavaScript source with JSLint - exit with status 1 if any of the files fail."
task :jslint do
  failed_files = []
  classpath = File.join(RAILS_ROOT, "vendor", "rhino.jar")
  jslint_path = File.join(RAILS_ROOT, "vendor", "jslint.js")
  Dir['public/**/*.js'].reject{|path| path =~ /public\/ext\//}.each do |fname|
    cmd = "java -cp #{classpath} org.mozilla.javascript.tools.shell.Main #{jslint_path} #{fname}"
    results = %x{#{cmd}}
    unless results =~ /^jslint: No problems found in/
      puts "#{fname}:"
      puts results
      failed_files << fname
    end
  end
  if failed_files.size > 0
    exit 1
  end
end