1 files changed, 21 insertions, 0 deletions
diff --git a/Library/Homebrew/dependable.rb b/Library/Homebrew/dependable.rb
new file mode 100644
index 000000000..2a1d7d880
--- /dev/null
+++ b/Library/Homebrew/dependable.rb
@@ -0,0 +1,21 @@
+require 'options'
+
+module Dependable
+  RESERVED_TAGS = [:build, :optional, :recommended]
+
+  def build?
+    tags.include? :build
+  end
+
+  def optional?
+    tags.include? :optional
+  end
+
+  def recommended?
+    tags.include? :recommended
+  end
+
+  def options
+    Options.coerce(tags - RESERVED_TAGS)
+  end
+end