todoer.rb

require 'TodoList'

class App
  def self.file_choser
    puts "Enter a filename to use:"
    gets.chomp
  end
  
  def self.main
    file = file_choser
    list = TodoList.new(file)
    
    puts list
    
    begin
      puts "Input: "
      input = gets.chomp
      parts = input.split(' ').compact
      command = parts.shift
      
      case command
      when "show"
        puts list
      when "add"
        list.add parts.first
        puts "'#{parts.first}' added to todo list."
      when "save"
        list.write
        puts "List saved to file: #{list.file}"
      else
        puts "Command: #{command} is not implemented."
      end
    end while not input.empty?
    
    list.write
    puts "Goodbye."
  end
end

App.main