Move code to find outdated brew list

Library/Homebrew/brew.h.rb

@@ -385,6 +385,20 @@ def versions_of(keg_name)
 end
 
 
+def outdated_brews
+  require 'formula'
+
+  results = []
+  HOMEBREW_CELLAR.subdirs.each do |keg|
+    next unless keg.subdirs
+    name = keg.basename.to_s
+    if (not (f = Formula.factory(name)).installed? rescue nil)
+      results << [keg, name, f.version]
+    end
+  end
+  return results
+end
+
 ########################################################## class PrettyListing
 class PrettyListing
   def initialize path

bin/brew

@@ -366,18 +366,12 @@ begin
     exec "cat", ARGV.formulae.first.path, *ARGV.options
 
   when 'outdated'
-    require 'formula'
+    outdated_brews.each do |keg, name, version|
-    HOMEBREW_CELLAR.subdirs.each do |keg|
+      if $stdout.tty? and not ARGV.flag? '--quiet'
-      if keg.subdirs.length > 0
+        versions = keg.cd{ Dir['*'] }.join(', ')
-        name = keg.basename('.rb').to_s
+        puts "#{name} (#{versions} < #{version})"
-        if (not (f = Formula.factory(name)).installed? rescue nil)
+      else
-          if $stdout.tty? and not ARGV.flag? '--quiet'
+        puts name
-            versions = keg.cd{ Dir['*'] }.join(', ')
-            puts "#{name} (#{versions} < #{f.version})"
-          else
-            puts name
-          end
-        end
       end
     end