add command 'cask outdated'

1 files changed, 24 insertions, 0 deletions

diff --git a/Library/Homebrew/cask/lib/hbc/cask.rb b/Library/Homebrew/cask/lib/hbc/cask.rb
index 3f8da25b7..cf5f2b37a 100644
--- a/Library/Homebrew/cask/lib/hbc/cask.rb
+++ b/Library/Homebrew/cask/lib/hbc/cask.rb
@@ -89,6 +89,30 @@ module Hbc
       metadata_master_container_path.join(*installed_version, "Casks", "#{token}.rb")
     end
 
+    def outdated?(greedy = false)
+      !outdated_versions(greedy).empty?
+    end
+
+    def outdated_versions(greedy = false)
+      # special case: tap version is not available
+      return [] if version.nil?
+
+      if greedy
+        return versions if version.latest?
+      elsif auto_updates
+        return []
+      end
+
+      installed = versions
+      current   = installed.last
+
+      # not outdated unless there is a different version on tap
+      return [] if current == version
+
+      # collect all installed versions that are different than tap version and return them
+      installed.select { |v| v != version }
+    end
+
     def to_s
       @token
     end