From 0243e1f9a70c6bb1304dacc3abbb0d0d0ca383b2 Mon Sep 17 00:00:00 2001
From: Markus Reiter <me@reitermark.us>
Date: Fri, 9 Sep 2016 00:11:43 +0200
Subject: [PATCH] Add language method to `OS::Mac`.

---
 Library/Homebrew/os/mac.rb                    | 4 ++++
 Library/Homebrew/test/test_os_mac_language.rb | 8 ++++++++
 2 files changed, 12 insertions(+)
 create mode 100644 Library/Homebrew/test/test_os_mac_language.rb

diff --git a/Library/Homebrew/os/mac.rb b/Library/Homebrew/os/mac.rb
index 70cd3e33f5..6d5c81182e 100644
--- a/Library/Homebrew/os/mac.rb
+++ b/Library/Homebrew/os/mac.rb
@@ -41,6 +41,10 @@ module OS
       version.to_sym
     end
 
+    def language
+      @language ||= Utils.popen_read("defaults", "read", ".GlobalPreferences", "AppleLanguages").delete(" \n\"()").sub(/,.*/, "")
+    end
+
     # Locates a (working) copy of install_name_tool, guaranteed to function
     # whether the user has developer tools installed or not.
     def install_name_tool
diff --git a/Library/Homebrew/test/test_os_mac_language.rb b/Library/Homebrew/test/test_os_mac_language.rb
new file mode 100644
index 0000000000..6cc9525b4d
--- /dev/null
+++ b/Library/Homebrew/test/test_os_mac_language.rb
@@ -0,0 +1,8 @@
+require "testing_env"
+require "os/mac"
+
+class OSMacLanguageTests < Homebrew::TestCase
+  def test_language_format
+    assert_match %r{\A[a-z]{2}(-[A-Z]{2})?\Z}, OS::Mac.language
+  end
+end