fseventを使ってディレクトリを監視する。変更があったらsh.system()の内容を実行。

gistfile1.rb

# This script watches modifications on the given directory, using the new                                                                                                                             
# FSEvents API in Leopard.                                                                                                                                                                            
                                                                                                                                                                                                      
require 'osx/foundation'                                                                                                                                                                              
require 'shell'                                                                                                                                                                                       
OSX.require_framework '/System/Library/Frameworks/CoreServices.framework/Frameworks/CarbonCore.framework'                                                                                             
include OSX                                                                                                                                                                                           
                                                                                                                                                                                                      
def die(s)                                                                                                                                                                                            
  $stderr.puts s                                                                                                                                                                                      
  exit 1                                                                                                                                                                                              
end                                                                                                                                                                                                   
                                                                                                                                                                                                      
die "Usage: #{__FILE__} <path>" unless ARGV.size == 1                                                                                                                                                 
                                                                                                                                                                                                      
fsevents_cb = proc do |stream, ctx, numEvents, paths, marks, eventIDs|                                                                                                                                
  paths.regard_as('*')                                                                                                                                                                                
  numEvents.times do |n|                                                                                                                                                                              
    puts "Event on path `#{paths[n]}' ID `#{eventIDs[n]}'"                                                                                                                                            
    sh = Shell.cd("./")                                                                                                                                                                               
    sh.system("**** Do your own command.*****")                                                                                                                
  end                                                                                                                                                                                                 
end                                                                                                                                                                                                   
                                                                                                                                                                                                      
path = ARGV.first                                                                                                                                                                                     
stream = FSEventStreamCreate(                                                                                                                                                                         
  KCFAllocatorDefault,                                                                                                                                                                                
  fsevents_cb,                                                                                                                                                                                        
  nil,                                                                                                                                                                                                
  [path],                                                                                                                                                                                             
  KFSEventStreamEventIdSinceNow,                                                                                                                                                                      
  1.0,                                                                                                                                                                                                
  0)                                                                                                                                                                                                  
                                                                                                                                                                                                      
die "Failed to create the FSEventStream" unless stream                                                                                                                                                
                                                                                                                                                                                                      
FSEventStreamScheduleWithRunLoop(                                                                                                                                                                     
  stream,                                                                                                                                                                                             
  CFRunLoopGetCurrent(),                                                                                                                                                                              
  KCFRunLoopDefaultMode)                                                                                                                                                                              
                                                                                                                                                                                                      
ok = FSEventStreamStart(stream)                                                                                                                                                                       
die "Failed to start the FSEventStream" unless ok                                                                                                                                                     
                                                                                                                                                                                                      
begin                                                                                                                                                                                                 
  CFRunLoopRun()                                                                                                                                                                                      
rescue Interrupt                                                                                                                                                                                      
  FSEventStreamStop(stream)                                                                                                                                                                           
  FSEventStreamInvalidate(stream)                                                                                                                                                                     
  FSEventStreamRelease(stream)                                                                                                                                                                        
end