add detection for Dart

lib/linguist/languages.yml

@@ -296,6 +296,13 @@ Darcs Patch:
   - .darcspatch
   - .dpatch
 
+Dart:
+  type: programming
+  lexer: Dart
+  primary_extension: .dart
+  extensions:
+  - .dart
+
 Delphi:
   type: programming
   primary_extension: .pas

test/test_blob.rb

@@ -430,6 +430,9 @@ class TestBlob < Test::Unit::TestCase
 
     # Julia: http://julialang.org/
     assert_equal Language['Julia'], blob("stockcorr.jl").language
+
+    # Dart: http://dartlang.org/
+    assert_equal Language['Dart'], blob("point.dart").language
   end
 
   def test_lexer
@@ -442,6 +445,7 @@ class TestBlob < Test::Unit::TestCase
     assert_equal Lexer['Tea'], blob("foo.tea").lexer
     assert_equal Lexer['vhdl'], blob("foo.vhd").lexer
     assert_equal Lexer['Julia'], blob("stockcorr.jl").lexer
+    assert_equal Lexer['Dart'], blob("point.dart").lexer
   end
 
   def test_shebang_script

test/test_language.rb

@@ -95,6 +95,7 @@ class TestLanguage < Test::Unit::TestCase
     assert_equal Language['Common Lisp'], Language.find_by_alias('common-lisp')
     assert_equal Language['Common Lisp'], Language.find_by_alias('lisp')
     assert_equal Language['Darcs Patch'], Language.find_by_alias('dpatch')
+    assert_equal Language['Dart'], Language.find_by_alias('dart')
     assert_equal Language['Emacs Lisp'], Language.find_by_alias('elisp')
     assert_equal Language['Emacs Lisp'], Language.find_by_alias('emacs')
     assert_equal Language['Emacs Lisp'], Language.find_by_alias('emacs-lisp')
@@ -242,6 +243,7 @@ class TestLanguage < Test::Unit::TestCase
   def test_find_by_extension
     assert_equal Language['Ruby'], Language.find_by_extension('.rb')
     assert_equal Language['Ruby'], Language.find_by_extension('rb')
+    assert_equal Language['Dart'], Language.find_by_extension('dart')
     assert_equal Language['Groff'], Language.find_by_extension('man')
     assert_equal Language['Groff'], Language.find_by_extension('1')
     assert_equal Language['Groff'], Language.find_by_extension('2')