Allow delimiting by comma in the language name

lib/linguist/language.rb

@@ -150,7 +150,7 @@ module Linguist
     #
     # Returns the Language or nil if none was found.
     def self.find_by_name(name)
-      name && @name_index[name.downcase]
+      name && (@name_index[name.downcase] || @name_index[name.split(',').first.downcase])
     end
 
     # Public: Look up Language by one of its aliases.
@@ -164,7 +164,7 @@ module Linguist
     #
     # Returns the Language or nil if none was found.
     def self.find_by_alias(name)
-      name && @alias_index[name.downcase]
+      name && (@alias_index[name.downcase] || @alias_index[name.split(',').first.downcase])
     end
 
     # Public: Look up Languages by filename.
@@ -240,7 +240,7 @@ module Linguist
     #
     # Returns the Language or nil if none was found.
     def self.[](name)
-      name && @index[name.downcase]
+      name && (@index[name.downcase] || @index[name.split(',').first.downcase])
     end
 
     # Public: A List of popular languages

test/test_language.rb

@@ -263,6 +263,18 @@ class TestLanguage < Minitest::Test
     assert_equal 'AGS Script', Language.find_by_alias('AGS').name
   end
 
+  def test_find_ignores_comma
+    assert_equal 'Rust', Language['rust,no_run'].name
+  end
+
+  def test_find_by_name_ignores_comma
+    assert_equal Language['Rust'], Language.find_by_name('rust,no_run')
+  end
+
+  def test_find_by_alias_ignores_comma
+    assert_equal Language['Rust'], Language.find_by_alias('rust,no_run')
+  end
+
   def test_name
     assert_equal 'Perl',   Language['Perl'].name
     assert_equal 'Python', Language['Python'].name