reimplement ono/resque@6790e8c3328 using separate task

Author: yaauie

lib/resque/tasks.rb

@@ -5,7 +5,7 @@
   task :setup
 
   desc "Start a Resque worker"
-  task :work => :setup do
+  task :work => [:pidfile, :setup] do
     require 'resque'
 
     queues = (ENV['QUEUES'] || ENV['QUEUE']).to_s.split(',')
@@ -26,10 +26,6 @@
       Process.daemon(true)
     end
 
-    if ENV['PIDFILE']
-      File.open(ENV['PIDFILE'], 'w') { |f| f << worker.pid }
-    end
-
     worker.log "Starting worker #{worker}"
 
     worker.work(ENV['INTERVAL'] || 5) # interval, will block