todo list working

todo_working.rb

require_relative 'todo_class'

input = ARGV
action = input.slice!(0)

my_task = Todo.new
puts "My TODO list"
puts "---------------------"

my_task.list if action == "list"
my_task.append(ARGV)    if action == "append"
my_task.prepend(ARGV)   if action == "prepend"
my_task.delete(ARGV)    if action == "delete"
my_task.complete(ARGV)  if action == "complete"



class Todo
  attr_accessor :tasks, :file

  def open_file(access)
    @file = File.open("task_list.txt", access)
  end

  def all_tasks
    @tasks = []
    @file.each_line {|line| @tasks << line}
  end

  def close_file
    @file.close
  end

  def list
    open_file("r")
    all_tasks
    @tasks.each_with_index do |task, n|
      puts "#{n+1}. #{task}"
    end
    close_file
  end

  def append(new_task)
    open_file("a+")
    all_tasks
    @file << "\n" + new_task.join(" ")
    close_file
    list
  end

  def delete(num)
    open_file("r")
    all_tasks
    @tasks.delete_at(num[0].to_i-1)
    close_file
    write_back
  end

  def write_back()
    open_file("w")
    @tasks.each {|task| @file << task}
    close_file
    list
  end

  def prepend(new_task)
    open_file("r")
    all_tasks
    close_file
    @tasks.insert(0,(new_task.join(" ")) + "\n")
    write_back
  end

  def complete(num)
    open_file("r")
    all_tasks
    close_file
    @tasks[num[0].to_i-1].chomp! << " COMPLETE!!\n"
    write_back
  end

end