Load Git Attributes for Linguist-specific overrides

lib/linguist/lazy_blob.rb

@@ -1,8 +1,13 @@
 require 'linguist/blob_helper'
+require 'linguist/language'
 require 'rugged'
 
 module Linguist
   class LazyBlob
+    GIT_ATTR = ['linguist-ignore', 'linguist-lang']
+    GIT_ATTR_OPTS = { :priority => [:index], :skip_system => true }
+    GIT_ATTR_FLAGS = Rugged::Repository::Attributes.parse_opts(GIT_ATTR_OPTS)
+
     include BlobHelper
 
     MAX_SIZE = 128 * 1024
@@ -19,6 +24,25 @@ module Linguist
       @mode = mode
     end
 
+    def git_attributes
+      @git_attributes ||= repository.fetch_attributes(
+        name, GIT_ATTR, GIT_ATTR_FLAGS)
+    end
+
+    def ignored?
+      !!git_attributes['linguist-ignore']
+    end
+
+    def overriden_language
+      if lang = git_attributes['linguist-lang']
+        Language.find_by_name(lang)
+      end
+    end
+
+    def language
+      @language ||= (overriden_language || Language.detect(self))
+    end
+
     def data
       load_blob!
       @data