$LOAD_PATH.unshift('../../lib', __FILE__)
require "quickl"
$wrappers = []

def wrap(filter, &block)
  $wrappers << [ filter, block ]
end

def build_wrapper(command, filter, continuation)
  lambda{|cont|
    if !filter || command.instance_eval(&filter)
      command.instance_exec(continuation, &b)
    else
      continuation.call
    end
  }
end

def execute(command, &block)
  first = build_wrapper(command, *$wrappers.first)
  c = $wrappers[1..-1].inject(first){|cont,wrapper|
    build_wrapper(command, *wrapper)
  }
  c.call(block)
end

wrap(lambda{ true }){|cont|
  puts "wrap 1"
  cont.call
  puts "end wrap 1"
}
wrap(lambda{ true }){|cont|
  puts "wrap 2"
  cont.call
  puts "end wrap 2"
}
execute(self){
  puts "hello"
}