From 3c45e1e81d8c2c280acc91b1bce73fa4a97b626c Mon Sep 17 00:00:00 2001
From: Xu Cheng <xucheng@me.com>
Date: Sat, 15 Aug 2015 18:32:22 +0800
Subject: [PATCH] update: only compute tapd_basename when necessary

---
 Library/Homebrew/cmd/update.rb | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/Library/Homebrew/cmd/update.rb b/Library/Homebrew/cmd/update.rb
index 2d7d51eb1e..cbd22a05cd 100644
--- a/Library/Homebrew/cmd/update.rb
+++ b/Library/Homebrew/cmd/update.rb
@@ -122,9 +122,8 @@ module Homebrew
   def rename_taps_dir_if_necessary
     Dir.glob("#{HOMEBREW_LIBRARY}/Taps/*/") do |tapd|
       begin
-        tapd_basename = File.basename(tapd)
-
         if File.directory?(tapd + "/.git")
+          tapd_basename = File.basename(tapd)
           if tapd_basename.include?("-")
             # only replace the *last* dash: yes, tap filenames suck
             user, repo = tapd_basename.reverse.sub("-", "/").reverse.split("/")