From 640109f73dee088bcaa01ec77de9eaced6580e65 Mon Sep 17 00:00:00 2001
From: Xu Cheng
Date: Fri, 31 Jul 2015 16:02:11 +0800
Subject: ARGV#resolved_formulae: auto resolve spec

---
 Library/Homebrew/extend/ARGV.rb | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/Library/Homebrew/extend/ARGV.rb b/Library/Homebrew/extend/ARGV.rb
index 7e0bd7feb..4a95f0d5a 100644
--- a/Library/Homebrew/extend/ARGV.rb
+++ b/Library/Homebrew/extend/ARGV.rb
@@ -20,9 +20,14 @@ module HomebrewArgvExtension
     require "formula"
     @resolved_formulae ||= (downcased_unique_named - casks).map do |name|
       if name.include?("/")
-        Formulary.factory(name, spec)
+        f = Formulary.factory(name, spec)
+        if spec(default=nil).nil? && f.any_version_installed?
+          installed_spec = Tab.for_formula(f).spec
+          f.set_active_spec(installed_spec) if f.send(installed_spec)
+        end
+        f
       else
-        Formulary.from_rack(HOMEBREW_CELLAR/name, spec)
+        Formulary.from_rack(HOMEBREW_CELLAR/name, spec(default=nil))
       end
     end
   end
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