From 4e11656e01f4f182bf7357b2bedc2fb4f1be1fa2 Mon Sep 17 00:00:00 2001
From: Jack Nagel <jacknagel@gmail.com>
Date: Tue, 17 Dec 2013 20:43:45 -0600
Subject: [PATCH] versions: improve performance of rev_list

---
 Library/Homebrew/cmd/versions.rb | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/Library/Homebrew/cmd/versions.rb b/Library/Homebrew/cmd/versions.rb
index d92627270f..f76c7b8bba 100644
--- a/Library/Homebrew/cmd/versions.rb
+++ b/Library/Homebrew/cmd/versions.rb
@@ -31,7 +31,7 @@ end
 class Formula
   def versions
     versions = []
-    rev_list.each do |sha|
+    rev_list do |sha|
       version = version_for_sha sha
       unless versions.include? version or version.nil?
         yield version, sha if block_given?
@@ -43,7 +43,7 @@ class Formula
 
   def bottle_version_map branch='HEAD'
     map = Hash.new { |h, k| h[k] = [] }
-    rev_list(branch).each do |rev|
+    rev_list(branch) do |rev|
       formula_for_sha(rev) do |f|
         bottle = f.class.send(:bottle)
         unless bottle.checksums.empty?
@@ -81,7 +81,9 @@ class Formula
 
     def rev_list branch='HEAD'
       repository.cd do
-        `git rev-list --abbrev-commit --remove-empty #{branch} -- #{entry_name}`.split
+        IO.popen("git rev-list --abbrev-commit --remove-empty #{branch} -- #{entry_name}") do |io|
+          yield io.readline.chomp until io.eof?
+        end
       end
     end