Change FileBlob to accept a base path

lib/linguist/file_blob.rb

@@ -4,8 +4,9 @@ module Linguist
   class FileBlob
     include BlobHelper
 
-    def initialize(path, name = path)
-      @path, @name = path, name
+    def initialize(path, base_path = nil)
+      @path = path
+      @name = base_path ? path.sub("#{base_path}/", '') : path
     end
 
     attr_reader :name

lib/linguist/repository.rb

@@ -10,8 +10,8 @@ module Linguist
     def self.from_directory(base_path)
       paths = Dir["#{base_path}/**/*"].inject({}) do |h, path|
         if File.file?(path)
-          name    = path.sub("#{base_path}/", '')
-          h[name] = FileBlob.new(path, name)
+          blob = FileBlob.new(path, base_path)
+          h[blob.name] = blob
         end
         h
       end

test/test_blob.rb

@@ -6,9 +6,12 @@ require 'mime/types'
 class TestBlob < Test::Unit::TestCase
   include Linguist
 
+  def fixtures_path
+    File.expand_path("../fixtures/blob", __FILE__)
+  end
+
   def blob(name)
-    path = File.expand_path("../fixtures/blob/#{name}", __FILE__)
-    FileBlob.new(path, name)
+    FileBlob.new(File.join(fixtures_path, name), fixtures_path)
   end
 
   def test_name