Handy routines while using InteractiveMacRuby

gistfile1.rb

#== these snippets can go into .irbrc.

# grab an object with its id; in MacRuby this can either be the ruby object id or the decimal / hex pointer address to the object that you can easily find with NSLog / puts.
def o( id )
  ObjectSpace._id2ref id
end

# grab instances of a particular class
# e.g. i(MyClass)
def i( klass )
  instances = ObjectSpace.each_object(klass).to_a
  instances.length > 1 ? instances : instances.first
end


#== these snippets are MacRuby-specific, so should probably go into something like .macirbrc.

# invoke block on main thread; cribbed from the MacRuby mailing list.
def on_main( &block )
  o = Object.new
  def o.call
    @block.call
  end
  o.instance_variable_set(:@block, block)
  o.performSelectorOnMainThread( 'call', withObject: nil, waitUntilDone: true )
end

alias_method :om, :on_main


def concurrently( lambda, completion_lambda = nil )
  Dispatch::Queue.concurrent.async do
    begin
      lambda.call
    ensure
      completion_lambda.call if completion_lambda
    end
  end
end