smith_prototype.rb

#!/bin/env ruby


class SmithCommands
  attr_accessor :plugins
  def initialize

    @plugins = []
  end

  def check_and_run(msg)
    @plugins.each do |p|
      if p.matches? msg
        p.run(msg)
        return
      end
    end
    not_found
  end
  def not_found
    puts "I didn't find a matching plugin."
  end
end

module CommandMixin
  def add_to_commands(commands)
    puts "adding #{self.class} to commands"
    commands.plugins << self
  end
end

class Buttle
  include CommandMixin
  def initialize(commands)
    add_to_commands(commands)
  end

  def matches?(line)
    true if line.include? "Smith"
  end

  def run(line)
    puts "You rang?"
  end
end

class Jerk
  include CommandMixin
  def initialize(commands)
    add_to_commands(commands)
  end

  def matches?(line)
    line.include? "HEY"
  end

  def run(line)
    puts "WHAT THE HELL DO YOU WANT?"
  end
end


commands = SmithCommands.new
Buttle.new(commands)
Jerk.new(commands)
["Hey Smith", "HEY ASSHOLE!", "bla bla bla"].each do |m|
  puts "Checking and running for #{m}"
  commands.check_and_run(m)
end