Fix lame version, eg. 398-2

Included test this time!

Library/Homebrew/pathname+yeast.rb

@@ -96,6 +96,9 @@ class Pathname
     out<<`du -hd0 #{to_s} | cut -d"\t" -f1`.strip
   end
 
+  # attempts to retrieve the version component of this path, so generally
+  # you'll call it on tarballs or extracted tarball directories, if you add
+  # to this please provide amend the unittest
   def version
     if directory?
       # directories don't have extnames
@@ -118,6 +121,10 @@ class Pathname
     /-((\d+\.)*\d\.\d+-p?\d+)$/.match stem
     return $1 if $1
     
+    # eg. lame-398-1
+    /-((\d)+-\d)/.match stem
+    return $1 if $1
+
     # eg. foobar-4.5.1
     /-((\d+\.)*\d+)$/.match stem
     return $1 if $1

Library/Homebrew/unittest.rb

@@ -374,6 +374,11 @@ class BeerTasting <Test::Unit::TestCase
     assert_equal '0.1.9', d.version
   end
   
+  def test_lame_version_style
+    f=MockFormula.new 'http://kent.dl.sourceforge.net/sourceforge/lame/lame-398-2.tar.gz'
+    assert_equal '398-2', f.version
+  end
+  
   def test_ruby_version_style
     f=MockFormula.new 'ftp://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.1-p243.tar.gz'
     assert_equal '1.9.1-p243', f.version