bot.rb

require 'sequel'
require 'sinatra'

class TwitchBot
  def self.start(db_config, irc_config)
    print  'Connecting to database............'
    @db = Sequel.connect db_config
    puts 'Done.'

    print  'Connecting to IRC............'
    # stall until irc.rb runs and prints "connected"
    puts 'Done.'

    print  'Starting web server............'
    # something
    puts 'Done.'
  end
end

irc.rb

require 'isaac'

configure do |c|
  c.nick    = 'bot'
  c.server  = 'irc.asdf.asdf'
  c.port    = 6667
  c.password = ''
  c.verbose = false
end

on :connect do
  puts 'connected'
end