Squash just literal spaces, not any whitespace. Using ruby again.

bin/git-whitespace

@@ -3,4 +3,4 @@
 require File.join(File.dirname(__FILE__), '..', 'lib', 'whitespace')
 
 files = Finder.new.files(Dir.pwd)
-exec 'perl', '-pi', '-e', 's/^\s+$//g', *files
+exec "ruby", "-pi", "-e", "gsub(/^ +$/, '')", *files

lib/whitespace.rb

@@ -5,27 +5,27 @@ def initialize
     @directories_to_prune = %w[.git vendor]
     @extensions           = %w[builder css erb haml html icalendar js rake rb yml] + ['']
   end
-  
+
   def files(directory)
     files = []
-    
+
     Find.find directory do |path|
       if FileTest.directory? path
         Find.prune if should_prune?(path)
       else
         files.push(path) if should_include?(path)
       end
     end
-    
+
     files
   end
-  
+
   private
-  
+
   def should_include?(path)
     @extensions.include?(File.extname(path).sub(/^\./, ''))
   end
-  
+
   def should_prune?(path)
     @directories_to_prune.include?(File.basename(path))
   end

test/unit/whitespace_test.rb

@@ -3,19 +3,19 @@
 class WhitespaceTest < Test::Unit::TestCase
   context Finder do
     setup { @files = Finder.new.files(fixtures) }
-    
+
     should 'ignore vendor' do
       assert_does_not_contain @files, /vendor/
     end
-    
+
     should 'ignore .extension' do
       assert_does_not_contain @files, fixtures('lib', 'file_with_unusual.extension')
     end
-    
+
     should 'include fixtures.rb' do
       assert_contains @files, fixtures('lib', 'fixtures.rb')
     end
-    
+
     should 'include README' do
       assert_contains @files, fixtures('README')
     end