Ruby Interactive Command Line Thread Manager

cli-thread-manager.rb

# Interactive Command Line Thread Manager
#
# The following code allows you to manage multiple threads
# from a single command-line instance with fully 
# customizeable commands
#
# @author = Jean M. Lescure
# @date = 2014/5/24

COMMANDS = ['help','new','list','kill','describe']
THREADS = []

def help(*arg)
  puts ''
  puts 'Welcome to CLI Thread Manager'
  puts ''
  puts 'The following is a list of available commands:'
  puts ''
  COMMANDS.each do |command|
    puts " #{command}"
  end
end

def new(*arg)
  args = arg[0]
  THREADS << Thread.new{
      loop do; end
    }
  THREADS.last()[:description] = "Started at #{Time.now}"
  puts 'Started new thread successfully!'
  puts "\nid\t\tdescription\n#{THREADS.length-1}\t\t#{THREADS.last()[:description]}"
  puts "\n(tip: to change a thread's description simply run 'describe [id] [your description]')"
end

def list(*arg)
  id = 0
  puts "#{THREADS.length} threads in memory\n\nid\t\tstatus\t\tdescription"
  THREADS.each do |thread|
    puts "#{id}\t\t#{thread.status}\t\t#{thread[:description]}"
    id += 1
  end
end

def kill(*arg)
  args = arg[0]
  index = args[0].to_i
  
  if !THREADS[index].nil?
    Thread.kill(THREADS.delete(THREADS[index]))
  else
    puts "ERROR! Unable to kill thread with id: #{index}"
    puts '(Run "list" command to view running threads and their respective id numbers)'
  end
end

def describe(*arg)
  args = arg[0]
  index = args.shift().to_i
  
  if !THREADS[index].nil?
    THREADS[index][:description] = args.join(' ')
  else
    puts "ERROR! No thread with id: #{index}"
    puts '(Run "list" command to view running threads and their respective id numbers)'
  end
end

print 'th-man> '

while ARGF.gets
  input = $_.split(' ')
  command = input.shift
  
  exit if command == 'exit'
  if COMMANDS.include? command
    method(command).call(input)
  else
    puts "Unknown command: #{command}"
  end
  
  print 'th-man> '
end