From 65567eb55fc97925b023737456b1e989d48d68f2 Mon Sep 17 00:00:00 2001
From: Camillo Lugaresi <camillo.lugaresi@gmail.com>
Date: Wed, 6 Jun 2012 22:29:52 +0200
Subject: [PATCH] add method to find XQuartz version

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

diff --git a/Library/Homebrew/macos.rb b/Library/Homebrew/macos.rb
index 632077dbf2..c0d31e6fed 100644
--- a/Library/Homebrew/macos.rb
+++ b/Library/Homebrew/macos.rb
@@ -5,6 +5,8 @@ module MacOS extend self
   XCODE_3_BUNDLE_ID = "com.apple.Xcode"
   CLT_STANDALONE_PKG_ID = "com.apple.pkg.DeveloperToolsCLILeo"
   CLT_FROM_XCODE_PKG_ID = "com.apple.pkg.DeveloperToolsCLI"
+  APPLE_X11_BUNDLE_ID = "org.x.X11"
+  XQUARTZ_BUNDLE_ID = "org.macosforge.xquartz.X11"
 
   def version
     MACOS_VERSION
@@ -313,6 +315,16 @@ module MacOS extend self
     end
   end
 
+  def xquartz_version
+    # This returns the version number of XQuartz, not of the upstream X.org
+    # (which is why it is not called x11_version). Note that the X11.app
+    # distributed by Apple is also XQuartz, and therefore covered by this method.
+    path = app_with_bundle_id(XQUARTZ_BUNDLE_ID) or app_with_bundle_id(APPLE_X11_BUNDLE_ID)
+    version = if not path.nil? and path.exist?
+      `mdls -raw -name kMDItemVersion #{path}`.strip
+    end
+  end
+
   def x11_prefix
     @x11_prefix ||= if Pathname.new('/opt/X11/lib/libpng.dylib').exist?
       Pathname.new('/opt/X11')