Find the newest OmniGraffle document on Mac with Spotlight+MacRuby

gistfile1.rb

#
# Find the newest OmniGraffle document
#

framework 'Cocoa'

def finish(notification)
  if @query.resultCount > 0 then
    puts @query.resultAtIndex(0).valueForAttribute('kMDItemPath')
  end
  exit
end

@query = NSMetadataQuery.alloc.init
@query.searchScopes = [ "#{ENV['HOME']}" ]
# @query.setSortDescriptors([NSSortDescriptor.alloc.initWithKey('kMDItemContentModificationDate',
    ascending:false)])
@query.sortDescriptors = [NSSortDescriptor.alloc.initWithKey('kMDItemContentModificationDate',
    ascending:false)]
NSNotificationCenter.defaultCenter.addObserver(self,
    selector:'finish:',
    name:'NSMetadataQueryDidFinishGatheringNotification',
    object:@query)
@query.predicate = NSPredicate.predicateWithFormat("kMDItemContentType == %@",
   "com.omnigroup.omnigraffle.graffle")

@query.startQuery
NSRunLoop.currentRunLoop.run