class CmdLine

# File lib/cmdline.rb, line 5
def self.parse(args)
  @config = {}

  opts = OptionParser.new do |opt|
    opt.on('-i', '--interface=NIC', 'Network interface to sniff (required)') do |nic|
      @config[:nic] = nic
    end

    @config[:port] = 11211
    opt.on('-p', '--port=PORT', 'Network port to sniff on (default 11211)') do |port|
      @config[:port] = port
    end

    @config[:discard_thresh] = 0
    opt.on '-d', '--discard=THRESH', Float, 'Discard keys with request/sec rate below THRESH' do |discard_thresh|
      @config[:discard_thresh] = discard_thresh
    end

    @config[:refresh_rate] = 500
    opt.on '-r', '--refresh=MS', Float, 'Refresh the stats display every MS milliseconds' do |refresh_rate|
      @config[:refresh_rate] = refresh_rate
    end

    opt.on_tail '-h', '--help', 'Show usage info' do
      puts opts
      exit
    end
  end

  opts.parse!

  # bail if we're not root
  unless Process::Sys.getuid == 0
    puts "** ERROR: needs to run as root to capture packets"
    exit 1
  end

  # we need need a nic to listen on
  unless @config.has_key?(:nic)
    puts "** ERROR: You must specify a network interface to listen on"
    puts opts
    exit 1
  end

  # we can't do 'any' interface just yet due to weirdness with ruby pcap libs
  if @config[:nic] =~ %rany/
    puts "** ERROR: can't bind to any interface due to odd issues with ruby-pcap"
    puts opts
    exit 1
  end

  @config
end