From 6273d464ee463819fcf6055070b7ae549aed6472 Mon Sep 17 00:00:00 2001
From: Xu Cheng
Date: Sun, 29 Nov 2015 15:13:56 +0800
Subject: add Formula#installed_prefixes and Formula#installed_kegs

---
 Library/Homebrew/formula.rb | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'Library')

diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index 67f2f9f93..b65600893 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -436,6 +436,18 @@ class Formula
     prefix.parent
   end
 
+  # All of current installed prefix directories.
+  # @private
+  def installed_prefixes
+    rack.directory? ? rack.subdirs : []
+  end
+
+  # All of current installed kegs.
+  # @private
+  def installed_kegs
+    installed_prefixes.map { |dir| Keg.new(dir) }
+  end
+
   # The directory where the formula's binaries should be installed.
   # This is symlinked into `HOMEBREW_PREFIX` after installation or with
   # `brew link` for formulae that are not keg-only.
-- 
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