Promises and event handlers ?

gistfile1.coffee

doShow = ->
  new RSVP.Promise (resolve, reject) ->
    $("blah").off("shown.bs.modal")
    $("blah").on "shown.bs.modal", (e) ->
      resolve("I'm shown!")
    $("blah").modal("show")

doShow().then (message) ->
  console.log(message) # => "I'm shown!"
  
###
# Impl 2
###

resolvers = []

$("blah").on "shown.bs.modal", (e) ->
  resolver = resolvers.shift()
  if resolver?
    resolver("I'm shown!")
    
doShow ->
  promise = new RSVP.Promise (resolve, reject) ->
    resolvers.push(resolve)
  $("blah").modal("show")
  promise
  
doShow().then (message) ->
  console.log(message) # => "I'm shown!"