class Guard::Linux

def self.usable?(no_vendor = false)
  return false unless RbConfig::CONFIG['target_os'] =~ /linux/i
  $LOAD_PATH << File.expand_path('../../../vendor/linux/lib', __FILE__) unless no_vendor
  require 'rb-inotify'
  true
rescue LoadError
  false
end

def initialize(*)
  super
  @inotify = INotify::Notifier.new
  @files   = []
  @latency = 0.5
end

def start
  @stop = false
  super
  watch_change unless watch_change?
end

def stop
  super
  @stop = true
end

def watch(directory)
  worker.watch(directory, :recursive, :attrib, :create, :move_self, :close_write) do |event|
    unless event.name == "" # Event on root directory
      @files << event.absolute_name
    end
  end
rescue Interrupt
end

def watch_change
  @watch_change = true
  until @stop
    if RbConfig::CONFIG['build'] =~ /java/ || IO.select([worker.to_io], [], [], @latency)
      break if @stop
      sleep(@latency)
      worker.process
      files = modified_files(@files.shift(@files.size).map { |f| File.dirname(f) }.uniq)
      @callback.call(files) unless files.empty?
    end
  end
  @watch_change = false
end

def watch_change?
  !!(defined? @watch_change and @watch_change)
end

def worker
  @inotify
end