Class: FSEvent

Inherits:
Object
  • Object
show all
Defined in:
lib/rb-fsevent/fsevent.rb,
lib/rb-fsevent/version.rb

Constant Summary collapse

VERSION = 
'0.10.3'

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(args = nil, &block) ⇒ FSEvent

Returns a new instance of FSEvent.



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# File 'lib/rb-fsevent/fsevent.rb', line 21

def initialize args = nil, &block
  watch(args, &block) unless args.nil?
end

Instance Attribute Details

#callback ⇒ Object (readonly)

Returns the value of attribute callback.



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# File 'lib/rb-fsevent/fsevent.rb', line 19

def callback
  @callback
end

#paths ⇒ Object (readonly)

Returns the value of attribute paths.



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# File 'lib/rb-fsevent/fsevent.rb', line 19

def paths
  @paths
end

Instance Method Details

#open_pipe ⇒ Object 



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# File 'lib/rb-fsevent/fsevent.rb', line 107

def open_pipe
  IO.popen("'#{self.class.watcher_path}' #{options_string} #{shellescaped_paths}")
end

#process_running?(pid) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rb-fsevent/fsevent.rb', line 97

def process_running?(pid)
  begin
    Process.kill(0, pid)
    true
  rescue Errno::ESRCH
    false
  end
end

#run ⇒ Object 



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# File 'lib/rb-fsevent/fsevent.rb', line 38

def run
  @pipe    = open_pipe
  @running = true

  # please note the use of IO::select() here, as it is used specifically to
  # preserve correct signal handling behavior in ruby 1.8.
  while @running && IO::select([@pipe], nil, nil, nil)
    # managing the IO ourselves allows us to be careful and never pass an
    # incomplete message to OTNetstring.parse()
    message = ""
    length = ""
    byte = nil

    reading_length = true
    found_length = false

    while reading_length
      byte = @pipe.read_nonblock(1)
      if "#{byte}" =~ /\d/
        length << byte
        found_length = true
      elsif found_length == false
        next
      else
        reading_length = false
      end
    end
    length = Integer(length, 10)
    type = byte

    message << "#{length}#{type}"
    message << @pipe.read(length)

    decoded = OTNetstring.parse(message)
    modified_paths = decoded["events"].map {|event| event["path"]}
    # passing the full info as a second block param feels icky, but such is
    # the trap of backward compatibility.
    case callback.arity
      when 1
        callback.call(modified_paths)
      when 2
        callback.call(modified_paths, decoded)
    end
  end
rescue Interrupt, IOError, Errno::EBADF
ensure
  stop
end

#stop ⇒ Object 



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# File 'lib/rb-fsevent/fsevent.rb', line 87

def stop
  unless @pipe.nil?
    Process.kill('KILL', @pipe.pid) if process_running?(@pipe.pid)
    @pipe.close
  end
rescue IOError
ensure
  @running = false
end

#watch(watch_paths, options = nil, &block) ⇒ Object 



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# File 'lib/rb-fsevent/fsevent.rb', line 25

def watch(watch_paths, options=nil, &block)
  @paths      = watch_paths.kind_of?(Array) ? watch_paths : [watch_paths]
  @callback   = block

  if options.kind_of?(Hash)
    @options  = parse_options(options)
  elsif options.kind_of?(Array)
    @options  = options
  else
    @options  = []
  end
end