bottle_versions: add perforce bottle detection.

Library/Homebrew/bottle_version.rb

@@ -3,6 +3,10 @@ class BottleVersion < Version
     spec = Pathname.new(spec) unless spec.is_a? Pathname
     stem = spec.stem
 
+    # e.g. perforce-2013.1.610569-x86_64
+    m = /-([\d\.]+-x86(_64)?)/.match(stem)
+    return m.captures.first unless m.nil?
+
     super
   end
 end

Library/Homebrew/test/test_bottle_versions.rb

@@ -5,4 +5,9 @@ class BottleVersionParsingTests < Test::Unit::TestCase
   def assert_version_detected expected, path
     assert_equal expected, BottleVersion.parse(path).to_s
   end
+
+  def test_perforce_style
+    assert_version_detected '2013.1.610569-x86_64',
+      '/usr/local/perforce-2013.1.610569-x86_64.mountain_lion.bottle.tar.gz'
+  end
 end