耙子带参数

rake可以取到当前执行的task对象和rake 命令行参数，虽然以前就可以用ENV这个常量取道，但是现在的先声名再用的做法更清晰~

#rake namespace:demo arg1=oo arg2=xx

namespace :namespace do
  task :demo, :arg1, :arg2  do |t , args|
    #get current task
    p t.name                #=>   "namespace:demo"
    #get task arguments
    p args.arg1 + args.arg2 #=> "ooxx"
    p t.name_with_args      #=> "namespace:demo[arg1,arg2]"
    #envirenment
    p ENV                   #=> {"arg1"=>"oo", "arg2"=>"xx", ...}
  end
end

http://rake.rubyforge.org/files/doc/release_notes/rake-0_8_2_rdoc.html

http://jasonseifer.com/2010/04/06/rake-tutorial