todo.rb

require 'sinatra'
require 'shotgun'

class List
  attr_reader :all_tasks
  def initialize
    @all_tasks = []
    puts 'You have created a new list'
  end
  def add(task, status=false)
    all_tasks << Task.new(task, status)
    puts "Task '#{task}' added."
  end
  def remove(task_id)
    task_to_remove = @all_tasks[task_id-1]
    if task_to_remove != nil
      @all_tasks.delete_at(task_id-1)
      puts "Task '#{task_to_remove.description}' removed."
    else
      puts "Task not found."
    end
  end
  def show_tasks
    seperator
    puts "Your list: "
    @all_tasks.each do |task|
      puts "#{get_task_status(task)}   #{get_task_id(task)}. #{task.description}."
    end
    seperator
  end
  def change_status(task_id)
    task = @all_tasks[task_id-1]
    if task.status 
      task.status = false
      puts "Task '#{task.description}' needs to be done."
    else
      task.status = true
      puts "Task '#{task.description}' marked completed."
    end
  end
  def export_todo
    date = Time.now
    date = date.strftime("%m-%d-%y_%H-%M-%S")
    File.open("TODO_#{date}.txt", 'w') do |file| 
      @all_tasks.each do |task|
        file.write ("#{get_task_status(task)}   #{get_task_id(task)}. #{task.description}.\n")
      end
    end
    puts "To-do was exported."
  end
  private
  def get_task_id(task_id)
    @all_tasks.index(task_id) + 1
  end
  private
  def get_task_status(task)
    if task.status
      "👍"
    else
      "🖕"
    end
  end
  private
  def seperator
    str = ""
    40.times { str << "*" }
    print str << "\n"
  end
end

class Task
	attr_reader :description, :status
  attr_writer :description, :status
	def initialize(description, status)
		@description = description
    @status = status
  end
end

myList = List.new

get('/') do
  erb :index
  @tasks = myList.show_tasks
end

post '/' do
  @task = params[:task]
  myList.add(@task)
  "#{@tasks}"
end