middlewearable

gistfile1.txt

makeFunctionWithMiddleware = (originalFunction) ->
  _allFunctions = [originalFunction]
  decoratedFunction = ->
    _allFunctions[0].apply null, arguments
  decoratedFunction.use = (middleware) ->
    nextFunction = _allFunctions[_allFunctions.length - 1]
    _allFunctions.unshift (args...) -> middleware.apply null, args.concat nextFunction
  decoratedFunction

someFunction = (a, b) ->
  console.log a, b

someFunction = makeFunctionWithMiddleware someFunction

someFunction.use (a, b, next) ->
  if a is 'Hello'
    next a, b

someFunction.use (a, b, next) ->
  if a is 'World'
    next a, b

someFunction 'Hello', 'foo'
someFunction 'bar', 'World'
someFunction 'Hello', 'World'