add Commit#mime_type

lib/grit.rb

@@ -4,6 +4,10 @@ $:.unshift File.dirname(__FILE__) # For use/testing when no gem is installed
 
 # stdlib
 
+# third party
+require 'rubygems'
+require 'mime/types'
+
 # internal requires
 require 'grit/lazy'
 require 'grit/errors'

lib/grit/blob.rb

@@ -1,6 +1,8 @@
 module Grit
   
   class Blob
+    DEFAULT_MIME_TYPE = "text/plain"
+    
     attr_reader :id
     attr_reader :mode
     attr_reader :name
@@ -41,6 +43,14 @@ module Grit
       @data ||= @repo.git.cat_file({:p => true}, id)
     end
     
+    # The mime type of this file (based on the filename)
+    #
+    # Returns String
+    def mime_type
+      guesses = MIME::Types.type_for(self.name) rescue []
+      guesses.first ? guesses.first.simplified : DEFAULT_MIME_TYPE
+    end
+    
     # The blame information for the given file at the given commit
     #
     # Returns Array: [Grit::Commit, Array: [<line>]]

test/test_blob.rb

@@ -29,6 +29,20 @@ class TestBlob < Test::Unit::TestCase
     assert_equal 11, blob.size
   end
   
+  # data
+  
+  # mime_type
+  
+  def test_mime_type_should_return_mime_type_for_known_types
+    blob = Blob.create(@r, :id => 'abc', :name => 'foo.png')
+    assert_equal "image/png", blob.mime_type
+  end
+  
+  def test_mime_type_should_return_text_plain_for_unknown_types
+    blob = Blob.create(@r, :id => 'abc')
+    assert_equal "text/plain", blob.mime_type
+  end
+  
   # blame
   
   def test_blame