From 07b7dd7a7aa1bc2f1628a1081006845374426bc4 Mon Sep 17 00:00:00 2001
From: Jack Nagel <jacknagel@gmail.com>
Date: Sun, 1 Jan 2012 15:18:25 -0600
Subject: [PATCH] Add a helper to determine if a keg is linked

'keg.linked?' will return true if there is an entry for 'keg' in
LinkedKegs.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
---
 Library/Homebrew/keg.rb | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Library/Homebrew/keg.rb b/Library/Homebrew/keg.rb
index a0d028d08b..0f1ce70fe7 100644
--- a/Library/Homebrew/keg.rb
+++ b/Library/Homebrew/keg.rb
@@ -45,6 +45,10 @@ class Keg < Pathname
     @linked_keg_record ||= HOMEBREW_REPOSITORY/"Library/LinkedKegs"/fname
   end
 
+  def linked?
+    linked_keg_record.directory? and self == linked_keg_record.realpath
+  end
+
   def link
     raise "Cannot link #{fname}\nAnother version is already linked: #{linked_keg_record.realpath}" if linked_keg_record.directory?