stephan-nordnes-eriksen/feather_watch

module FeatherWatch
    class Watcher

        # Public: Initialize the file system watcher. 
        #
        # directories  - An array of directories to watch.
        # callback - A callback that will receive events. Recieved objects on form: {status: [:modified, :removed].sample, file: "path/to/file"}. ":modified" means everything except deleted.
        # verbose=false - Enable verbose mode. Warning: Can produce very much output
        #
        # Examples
        #
        #   FeatherWatch::Watcher.new([File.join(Dir.home, 'Desktop')], lambda{|e| puts "got event with status: #{e[:status]} on file #{e[:file]}"})
        #
        # Returns a Watcher object.
        def initialize(directories, callback, verbose= false, silence_exceptions= false)
            @verbose = verbose
            dir = directories
            dir = [directories] if directories.is_a?(String)
            raise "Unknown datatype for directories. Was: #{dir}" unless dir.is_a?(Array)

            dir.each do |d|
                raise "Not a vaild directory: #{d}" unless File.directory?(d)
            end

            @listener = FeatherWatch::Core::DarwinWatcher.new(dir, callback, verbose, silence_exceptions)  if FeatherWatch::OS.mac?
            @listener = FeatherWatch::Core::LinuxWatcher.new(dir, callback, verbose, silence_exceptions)   if FeatherWatch::OS.linux?
            @listener = FeatherWatch::Core::WindowsWatcher.new(dir, callback, verbose, silence_exceptions) if FeatherWatch::OS.windows?
        end

        # Public: Starts the watcher.
        #
        # Examples
        #
        #   watcher.start
        #   # => nil
        #
        # Returns nil
        def start
            @listener.start if @listener
        end

        # Public: Stops the watcher.
        #
        # Examples
        #
        #   watcher.start
        #   # => nil
        #
        # Returns nil
        def stop
            @listener.stop if @listener
        end
    end
end