First semi-reasonable version of the code.

.gitignore

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+config.rb
+*.swp
+*.swo
+*~

repost.rb

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+class Repost < EventMachine::IRC::Client
+
+    attr_accessor :triggers
+
+    def dispatch_raw_message(message = {})
+        self.triggers = [] if self.triggers.nil?
+        self.triggers.each do |trigger|
+            trigger[:code].call(message) if message[:command] == trigger[:command]
+        end
+    end
+
+    def register_trigger(command, &code)
+        self.triggers = [] if self.triggers.nil?
+        self.triggers << {:command => command, :code => code}
+    end
+
+end

run.rb

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+#!env ruby
+
+require 'rubygems'
+require 'eventmachine'
+require 'em-irc'
+require './config'
+require './repost'
+
+repost = Repost.new do
+
+    host Config[:server][:host]
+    port Config[:server][:port]
+
+    on :connect do
+        puts "connected! changing nick to #{Config[:client][:nick]}" 
+        nick Config[:client][:nick]
+    end
+
+    on :nick do
+        Config[:client][:channels].each do |channel|
+            puts "joining #{channel}"
+            join channel
+        end
+    end
+
+    on :raw do |message|
+        self.dispatch_raw_message message
+    end
+
+end
+
+#repost.register_trigger("PRIVMSG") { |msg| p msg }
+
+repost.run!