Fix absolute path handling by the Filesystem importer.

Closes sassgh-180

doc-src/SASS_CHANGELOG.md

@@ -13,6 +13,7 @@
 * Don't crash on JRuby if the underlying Java doesn't support every Unicode encoding.
 * Add new `updated_stylesheet` callback, which is run after each stylesheet has
   been successfully compiled. Thanks to [Christian Peters](https://github.com/ChristianPeters).
+* Allow absolute paths to be used in an importer with a different root.
 
 ### Deprecations -- Must Read!
 

lib/sass/importers/filesystem.rb

@@ -108,7 +108,7 @@ def escape_glob_characters(name)
       # @return [(String, Symbol)] A filename-syntax pair.
       def find_real_file(dir, name)
         for (f,s) in possible_files(remove_root(name))
-          path = (dir == ".") ? f : "#{dir}/#{f}"
+          path = (dir == "." || Pathname.new(f).absolute?) ? f : "#{dir}/#{f}"
           if full_path = Dir[path].first
             full_path.gsub!(REDUNDANT_DIRECTORY,File::SEPARATOR)
             return full_path, s

test/sass/importer_test.rb

@@ -176,10 +176,17 @@ def test_staleness_check_across_importers
       file_system_importer
     )
   end
+
   def fixture_dir
     File.join(File.dirname(__FILE__), "fixtures")
   end
+
   def fixture_file(path)
     File.join(fixture_dir, path)
   end
+
+  def test_absolute_files_across_template_locations
+    importer = Sass::Importers::Filesystem.new(absolutize 'templates')
+    assert_not_nil importer.mtime(absolutize('more_templates/more1.sass'), {})
+  end
 end

test/sass/test_helper.rb

@@ -3,6 +3,6 @@
 
 class Test::Unit::TestCase
   def absolutize(file)
-    "#{File.dirname(__FILE__)}/#{file}"
+    File.expand_path("#{File.dirname(__FILE__)}/#{file}")
   end
 end