1 files changed, 35 insertions, 0 deletions
diff --git a/Library/Homebrew/cmd/upgrade.rb b/Library/Homebrew/cmd/upgrade.rb
new file mode 100644
index 000000000..f86e8a871
--- /dev/null
+++ b/Library/Homebrew/cmd/upgrade.rb
@@ -0,0 +1,35 @@
+require 'cmd/outdated'
+require 'cmd/install'
+
+class Fixnum
+  def plural_s
+    if self > 1 then "s" else "" end
+  end
+end
+
+module Homebrew extend self
+  def upgrade
+    Homebrew.perform_preinstall_checks
+
+    outdated = if ARGV.named.empty?
+      Homebrew.outdated_brews
+    else
+      ARGV.formulae.map{ |f| [f.prefix.parent, f.name, f.version] }
+    end
+
+    if outdated.count > 1
+      oh1 "Upgrading #{outdated.count} outdated package#{outdated.count.plural_s}, with result:"
+      puts outdated.map{ |_, name, version| "#{name} #{version}" } * ", "
+    end
+
+    outdated.each do |rack, name, version|
+      installer = FormulaInstaller.new(Formula.factory(name))
+      installer.show_header = false
+      oh1 "Upgrading #{name}"
+      installer.install
+      Keg.new("#{rack}/#{version}").unlink
+      installer.caveats
+      installer.finish # includes link step
+    end
+  end
+end