HOMEBREW_CACHE is now a Pathname object

This is consistent with the other HOMEBREW_* path constants

Library/Homebrew/env.rb

@@ -20,6 +20,6 @@ require 'utils'
 
 # TODO if whoami == root then use /Library/Caches/Homebrew instead
 HOMEBREW_VERSION='0.3'
-HOMEBREW_CACHE=File.expand_path "~/Library/Caches/Homebrew"
+HOMEBREW_CACHE=Pathname.new("~/Library/Caches/Homebrew").expand_path
 HOMEBREW_PREFIX=Pathname.new(__FILE__).dirname.parent.parent.cleanpath
 HOMEBREW_CELLAR=HOMEBREW_PREFIX+'Cellar'

Library/Homebrew/formula.rb

@@ -96,7 +96,7 @@ public
   # yields self with current working directory set to the uncompressed tarball
   def brew
     ohai "Downloading #{@url}"
-    FileUtils.mkpath HOMEBREW_CACHE
+    HOMEBREW_CACHE.mkpath
     Dir.chdir HOMEBREW_CACHE do
       tmp=nil
       tgz=Pathname.new(fetch()).realpath

Library/Homebrew/hw.model.rb

@@ -1,7 +1,7 @@
 def hw_model_output
   require 'fileutils'
-  FileUtils.mkpath HOMEBREW_CACHE
-  exe=Pathname.new(HOMEBREW_CACHE)+'hw.model'
+  HOMEBREW_CACHE.mkpath
+  exe=HOMEBREW_CACHE+'hw.model'
   Kernel.system "gcc -Os #{File.dirname __FILE__}/hw.model.c -o #{exe}" unless exe.file?
   /(.*)(\d+),(\d+)/ =~ `#{exe}`
   yield $1, $2.to_i, $3.to_i

Library/Homebrew/unittest.rb

@@ -9,13 +9,13 @@ require 'utils'
 # these are defined in env.rb usually, but we don't want to break our actual
 # homebrew tree, and we do want to test everything :)
 HOMEBREW_VERSION='0.3t'
-HOMEBREW_CACHE="/tmp/testbrew"
+HOMEBREW_CACHE=Pathname.new "/tmp/testbrew"
 HOMEBREW_PREFIX=Pathname.new(HOMEBREW_CACHE)+'prefix'
 HOMEBREW_CELLAR=Pathname.new(HOMEBREW_CACHE)+'cellar'
 
 HOMEBREW_CELLAR.mkpath
 raise "HOMEBREW_CELLAR couldn't be created!" unless HOMEBREW_CELLAR.directory?
-at_exit { Pathname.new(HOMEBREW_CACHE).rmtree }
+at_exit { HOMEBREW_CACHE.rmtree }
 require 'test/unit' # must be after at_exit