Small TODO Script in Ruby

todo.rb

#!/usr/bin/env ruby
require 'debugger'
TODO_FILE = "#{Dir.home}/.mtodo"


COMMANDS =  [:list, :remove, :add, :help] 

class Todo
  attr_reader :todolist
  def initialize(todofile)
    @todofile = todofile
    @todolist = read
  end

  def remove(index)
    @todolist.delete_at(index)
  end

  def add(content)
    @todolist.push content
  end

  
  def save
    begin
      File.open @todofile, 'w' do |file|
        file.write @todolist.join "\n"
      end
    rescue
      print "Could not save file\n"
    end
  end
  # flush on destructor

  private
  def read
    begin
      File.open @todofile do |file|
        @todolist = file.each_line.collect { |x| x.delete "\n" }
      end
    rescue
      print "Could't open/read file\n"
      @todolist = []
    end
  end
end

class Manager
  def initialize
    @todo = Todo.new(TODO_FILE)
  end

  def list
    i = 1
    @todo.todolist.each do |todo|
      print i.to_s + ": " + todo + "\n"
      i+=1
    end
  end

  def add
    begin
      @todo.add(ARGV[1])
    rescue
      print "Needs some argument to add.\n"
    end
  end
  
  def remove
    index = ARGV[1].to_i
    if index == 0
      print "Give a valid index\n"
    else
      @todo.remove index-1
    end
  end
  
  def help
    print "Available commands: " + COMMANDS.map{ |s| s.to_s}.join(' ') + "\n"
  end

  def save
    @todo.save
  end
end

manager = Manager.new

if ARGV.length > 0
  command = ARGV[0].to_sym
  if COMMANDS.include? command
    manager.send(command)
    manager.save
  else
    manager.help
  end
else
  manager.help
end