From d7e95997ae85b06d55f5ebe1be3f17d4cdf733ca Mon Sep 17 00:00:00 2001
From: Xu Cheng <xucheng@me.com>
Date: Tue, 10 Nov 2015 18:33:57 +0800
Subject: [PATCH] tap: warn already tapped

---
 Library/Homebrew/cmd/tap.rb | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Library/Homebrew/cmd/tap.rb b/Library/Homebrew/cmd/tap.rb
index c0cb6e8f1b..701931f1e4 100644
--- a/Library/Homebrew/cmd/tap.rb
+++ b/Library/Homebrew/cmd/tap.rb
@@ -14,9 +14,11 @@ module Homebrew
     else
       user, repo = tap_args
       tap = Tap.fetch(user, repo)
-      unless tap.installed?
+      begin
         tap.install(:clone_target => ARGV.named[1],
                     :full_clone   => ARGV.include?("--full"))
+      rescue TapAlreadyTappedError => e
+        opoo e
       end
     end
   end