outdated: use new version comparison machinery

Library/Homebrew/cmd/outdated.rb

@@ -1,11 +1,12 @@
 require 'formula'
+require 'keg'
 
 module Homebrew extend self
   def outdated
-    outdated_brews.each do |f|
+    outdated_brews do |f|
       if $stdout.tty? and not ARGV.flag? '--quiet'
-        versions = f.rack.cd{ Dir['*'] }.join(', ')
-        puts "#{f.name} (#{versions} < #{f.version})"
+        versions = f.rack.subdirs.map { |d| Keg.new(d) }.map { |keg| keg.basename }
+        puts "#{f.name} (#{versions*', '} < #{f.version})"
       else
         puts f.name
       end
@@ -13,16 +14,15 @@ module Homebrew extend self
   end
 
   def outdated_brews
-    HOMEBREW_CELLAR.subdirs.map do |rack|
-      # Skip kegs with no versions installed
-      next unless rack.subdirs
+    HOMEBREW_CELLAR.subdirs.reject { |d| d.subdirs.empty? }.map do |rack|
+      f = Formula.factory(rack.basename.to_s) rescue nil
+      next if f.nil?
 
-      # Skip HEAD formulae, consider them "evergreen"
-      next if rack.subdirs.map{ |keg| keg.basename.to_s }.include? "HEAD"
-
-      name = rack.basename.to_s
-      f = Formula.factory name rescue nil
-      f if f and not f.installed?
+      kegs = rack.subdirs.map { |d| Keg.new(d) }
+      unless kegs.any? { |keg| keg.version >= f.version }
+        yield f if block_given?
+        f
+      end
     end.compact
   end
 end

Library/Homebrew/cmd/upgrade.rb

@@ -1,4 +1,3 @@
-require 'cmd/outdated'
 require 'cmd/install'
 
 class Fixnum
@@ -18,6 +17,7 @@ module Homebrew extend self
     Homebrew.perform_preinstall_checks
 
     outdated = if ARGV.named.empty?
+      require 'cmd/outdated'
       Homebrew.outdated_brews
     else
       ARGV.formulae.select do |f|