More brew irb examples

Library/Homebrew/cmd/irb.rb

@@ -2,6 +2,11 @@ require 'formula'
 require 'keg'
 require 'irb'
 
+class Symbol
+  def f
+    Formula.factory(self)
+  end
+end
 class String
   def f
     Formula.factory(self)
@@ -11,8 +16,10 @@ end
 module Homebrew extend self
   def irb
     if ARGV.include? "--help"
-      puts "Formula.factory('ace').installed?"
-      puts "ack.f # => instance of the Ack formula"
+      puts "'v8'.f # => instance of the Ack formula"
+      puts ":hub.f.installed?"
+      puts ":lua.f.methods - 1.methods"
+      puts ":mpd.f.recursive_deps.reject{|f| f.installed? }"
     else
       ohai "Interactive Homebrew Shell"
       puts "Example commands available with: brew irb --help"