1 files changed, 43 insertions, 0 deletions
diff --git a/Library/Homebrew/cask/developer/examples/brewcask-doutdated.rb b/Library/Homebrew/cask/developer/examples/brewcask-doutdated.rb
new file mode 100755
index 000000000..de0234c2f
--- /dev/null
+++ b/Library/Homebrew/cask/developer/examples/brewcask-doutdated.rb
@@ -0,0 +1,43 @@
+#!/usr/bin/env ruby
+#
+# Generously contributed by Markus Doits
+# https://github.com/doits
+# (c) 2014 MIT license
+#
+
+require "rubygems"
+
+class Hbc
+  def installed_version?
+    !installed_version.nil?
+  end
+
+  def installed_version
+    # returns latest installed version if possible
+
+    Pathname.glob(caskroom_path.join("*")).map(&:basename).sort do |x, y|
+      Gem::Version.new(x) <=> Gem::Version.new(y) # throws exception if invalid version is provided ...
+    end.last
+  rescue
+    nil
+    # ... return nil in this case
+  end
+
+  def update_available?
+    Gem::Version.correct?(version) && # we have something to compare against in Cask file ...
+      installed_version? && # ... we can determine current installed version ...
+      Gem::Version.new(installed_version) < Gem::Version.new(version) # ... compare
+  end
+end
+
+module Hbc::Scopes
+  module ClassMethods
+    def upgradable
+      Hbc.installed.select(&:update_available?)
+    end
+  end
+end
+
+upgradable_casks = Hbc.upgradable
+
+puts upgradable_casks.empty? && "No outdated packages" || upgradable_casks