Add support for custom version schemes

A version scheme is a class that inherits from Version and reimplements
Version#<=>. This will allow formulae to specify a custom comparison
method that will be used instead of the default, for cases where the
default is insufficient.

2 files changed, 21 insertions, 0 deletions

diff --git a/Library/Homebrew/test/test_formula.rb b/Library/Homebrew/test/test_formula.rb
index 4f9bb3930..5c6b78772 100644
--- a/Library/Homebrew/test/test_formula.rb
+++ b/Library/Homebrew/test/test_formula.rb
@@ -278,4 +278,11 @@ class FormulaTests < Test::Unit::TestCase
       when :mountainlion then '8badf00d8badf00d8badf00d8badf00d8badf00d'
       end, f.bottle.checksum.hexdigest
   end
+
+  def test_custom_version_scheme
+    f = CustomVersionSchemeTestBall.new
+
+    assert_version_equal '1.0', f.version
+    assert_instance_of CustomVersionScheme, f.version
+  end
 end
diff --git a/Library/Homebrew/test/testball.rb b/Library/Homebrew/test/testball.rb
index c7118d3ee..8e4c745d3 100644
--- a/Library/Homebrew/test/testball.rb
+++ b/Library/Homebrew/test/testball.rb
@@ -271,3 +271,17 @@ class RevisedBottleSpecTestBall < Formula
     super "revisedbottlespectestball"
   end
 end
+
+class CustomVersionScheme < Version
+end
+
+class CustomVersionSchemeTestBall < Formula
+  homepage 'http://example.com'
+  url 'file:///foo.com/testball-0.1.tbz'
+  sha1 '482e737739d946b7c8cbaf127d9ee9c148b999f5'
+  version '1.0' => CustomVersionScheme
+
+  def initialize name=nil
+    super "customversionschemetestball"
+  end
+end