Return Formula objects from outdated_brews

Previously, `outdated_brews` returned a list of lists---each containing three
components of a Formula object:

  - f.rack
  - f.name
  - f.version

Frequently more information is required which necessitates back-casting from
`name` to a Formula object---simpy returning formula objects removes this step.

Library/Homebrew/cmd/outdated.rb

@@ -2,12 +2,12 @@ require 'formula'
 
 module Homebrew extend self
   def outdated
-    outdated_brews.each do |keg, name, version|
+    outdated_brews.each do |f|
       if $stdout.tty? and not ARGV.flag? '--quiet'
-        versions = keg.cd{ Dir['*'] }.join(', ')
-        puts "#{name} (#{versions} < #{version})"
+        versions = f.rack.cd{ Dir['*'] }.join(', ')
+        puts "#{f.name} (#{versions} < #{f.version})"
       else
-        puts name
+        puts f.name
       end
     end
   end
@@ -22,7 +22,7 @@ module Homebrew extend self
 
       name = rack.basename.to_s
       f = Formula.factory name rescue nil
-      [rack, name, f.version] if f and not f.installed?
+      f if f and not f.installed?
     end.compact
   end
 end

Library/Homebrew/cmd/upgrade.rb

@@ -14,24 +14,23 @@ module Homebrew extend self
     outdated = if ARGV.named.empty?
       Homebrew.outdated_brews
     else
-      ARGV.formulae.map do |f|
+      ARGV.formulae.each do |f|
         raise "#{f} already upgraded" if f.installed?
         raise "#{f} not installed" unless f.rack.exist? and not f.rack.children.empty?
-        [f.rack, f.name, f.version]
       end
     end
 
     if outdated.length > 1
       oh1 "Upgrading #{outdated.length} outdated package#{outdated.length.plural_s}, with result:"
-      puts outdated.map{ |_, name, version| "#{name} #{version}" } * ", "
+      puts outdated.map{ |f| "#{f.name} #{f.version}" } * ", "
     end
 
-    outdated.each do |rack, name, version|
-      installer = FormulaInstaller.new(Formula.factory(name))
+    outdated.each do |f|
+      installer = FormulaInstaller.new f
       installer.show_header = false
-      oh1 "Upgrading #{name}"
+      oh1 "Upgrading #{f.name}"
       installer.install
-      Keg.new("#{rack}/#{version}").unlink
+      Keg.new("#{f.rack}/#{f.version}").unlink
       installer.caveats
       installer.finish # includes link step
     end