Das de alta personajes con nombre y arma y los puedes poner a pelear, si uno se muere se borra del csv,

combat.csv

funfight.rb

require './Gladiator.rb'

option=nil

#methods---------------------------------------------------------------------------------------------------------

def initialize_menu
  puts "1) new character \n2) combat \n3) exit \none, two or three?"
    option=gets.chomp
    choose = case option
      when '1' then new_character
      when '2' then combat_menu
      when '3' then Process.exit
    end
end

def new_character
  gladiator=Gladiator.new
  print 'name of the character? '
  gladiator.name=gets.chomp
  print 'weapon of the character? '
  gladiator.weapon=gets.chomp
  gladiator.save
  initialize_menu
end

def combat_menu
  Gladiator.show_all
  puts "who?(select a number) "
      option=gets.chomp
      puts "against?(select another number) "
      combat(option.to_i,gets.chomp.to_i)
end

def combat(numa,numb)

  gladiator1,gladiator2=Gladiator.find_by_index(numa), Gladiator.find_by_index(numb)
  gladiators=[gladiator1,gladiator2]
  states,combat_string=['','is injured','looks bad','is death'],''
  counts=[0,0]
  puts "#{gladiator1.name} VS #{gladiator2.name}\n"

  loop{
      turn=rand(2)
      turn.zero?? enemy = 1 : enemy =0
      rand(2).zero?? hits=true : hits=false

      combat_string << "#{gladiators[turn].name} attack with his #{gladiators[turn].weapon} "

      if hits then
         counts[enemy]+=1
         combat_string << " and hits! #{gladiators[enemy].name} #{states[counts[enemy]]} "
      elsif
          combat_string << "but fails"
      end

      combat_string << "\n"

      if counts.include?(3)
        gladiators[counts.index(3)].delete
        break
      end
  }

puts combat_string
initialize_menu
end

#----------------------------------------------------------------------------------------------------------------
initialize_menu
#----------------------------------------------------------------------------------------------------------------

Gladiator.rb

class Gladiator
  attr_accessor :name, :weapon

    def self.filepath
    'combat.csv'
    end

    def filepath
    Gladiator.filepath
    end

    def self.new(args=nil)
    gladiator = super
      unless args.nil? or args.empty?
          gladiator.name, gladiator.weapon = args[0], args[1]
      end
    gladiator
    end

    def self.show_all
        c=1
        File.open(filepath,'r') do |file|
          file.each{|line|
            puts "#{c}) #{line}" if not (line.start_with?("\n"))
            c+=1
          }
        end
    end

    def save
      File.open(filepath,'a') do |file|
        file.puts("#{self.name}, #{self.weapon}")
      end
    end

    def self.find_by_index(index)

      char_line=String.new
      char_array=[]
      char_line = File.readlines(filepath)[index-1]     # 1
      char_array = char_line.chop.split(', ')  if char_line
      Gladiator.new(char_array) if char_array

# 1) readlines Reads the entire file specified by name as individual lines, and returns those lines in an array.

    end

    def delete
       file_content =[]
       File.open(filepath,'r') do |file|
          file_content = file.select{|line| !line.start_with?(@name) }.collect{|line| line.chop }
       end
       File.open(filepath,'w') do |file|
         file_content.each{|line| file.puts line }
       end
    end

end