Detect Javascript files generated by Protocol Buffers.

lib/linguist/generated.rb

@@ -70,6 +70,7 @@ module Linguist
       compiled_cython_file? ||
       generated_go? ||
       generated_protocol_buffer? ||
+      generated_javascript_protocol_buffer? ||
       generated_apache_thrift? ||
       generated_jni_header? ||
       vcr_cassette? ||
@@ -277,6 +278,17 @@ module Linguist
       return lines[0].include?("Generated by the protocol buffer compiler.  DO NOT EDIT!")
     end
 
+    # Internal: Is the blob a Javascript source file generated by the
+    # Protocol Buffer compiler?
+    #
+    # Returns true of false.
+    def generated_javascript_protocol_buffer?
+      return false unless extname == ".js"
+      return false unless lines.count > 6
+
+      return lines[5].include?("GENERATED CODE -- DO NOT EDIT!")
+    end
+
     APACHE_THRIFT_EXTENSIONS = ['.rb', '.py', '.go', '.js', '.m', '.java', '.h', '.cc', '.cpp', '.php']
 
     # Internal: Is the blob generated by Apache Thrift compiler?
@@ -435,7 +447,7 @@ module Linguist
       return false unless lines.count > 1
       return lines[0].start_with?("// This is a generated file. Not intended for manual editing.")
     end
-        
+
     # Internal: Is this a roxygen2-generated file?
     #
     # A roxygen2-generated file typically contain:
@@ -449,7 +461,7 @@ module Linguist
 
       return lines[0].include?("% Generated by roxygen2: do not edit by hand")
     end
-        
+
     # Internal: Is this a Jison-generated file?
     #
     # Jison-generated parsers typically contain:
@@ -465,7 +477,7 @@ module Linguist
       return false unless extname == '.js'
       return false unless lines.count > 1
       return lines[0].start_with?("/* parser generated by jison ") ||
-              lines[0].start_with?("/* generated by jison-lex ")
+             lines[0].start_with?("/* generated by jison-lex ")
     end
   end
 end