consolidate shebang logic

lib/linguist/language.rb

@@ -11,7 +11,7 @@ require 'linguist/samples'
 require 'linguist/file_blob'
 require 'linguist/blob_helper'
 require 'linguist/strategy/filename'
-require 'linguist/strategy/shebang'
+require 'linguist/shebang'
 
 module Linguist
   # Language names that are recognizable by GitHub. Defined languages
@@ -95,7 +95,7 @@ module Linguist
 
     STRATEGIES = [
       Linguist::Strategy::Filename,
-      Linguist::Strategy::Shebang,
+      Linguist::Shebang,
       Linguist::Heuristics,
       Linguist::Classifier
     ]
@@ -213,6 +213,21 @@ module Linguist
       @interpreter_index[Linguist.interpreter_from_shebang(data)]
     end
 
+    # Public: Look up Languages by interpreter.
+    #
+    # interpreter - String of interpreter name
+    #
+    # Examples
+    #
+    #   Language.find_by_interpreter("bash")
+    #   # => [#<Language name="Bash">]
+    #
+    # Returns the matching Language
+    def self.find_by_interpreter(interpreter)
+      @interpreter_index[interpreter]
+    end
+
+
     # Public: Look up Language by its name or lexer.
     #
     # name - The String name of the Language