Add code statistics for Javascript and

CoffeeScript files to `rake stats` task

Orignal PR was #2270

Thanks to @nfm

railties/lib/rails/code_statistics.rb

@@ -26,7 +26,7 @@ class CodeStatistics #:nodoc:
       Hash[@pairs.map{|pair| [pair.first, calculate_directory_statistics(pair.last)]}]
     end
 
-    def calculate_directory_statistics(directory, pattern = /.*\.rb$/)
+    def calculate_directory_statistics(directory, pattern = /.*\.(rb|js|coffee)$/)
       stats = { "lines" => 0, "codelines" => 0, "classes" => 0, "methods" => 0 }
 
       Dir.foreach(directory) do |file_name|
@@ -39,6 +39,13 @@ class CodeStatistics #:nodoc:
 
         comment_started = false
         
+        case file_name
+        when /.*\.js$/
+          comment_pattern = /^\s*\/\//
+        else
+          comment_pattern = /^\s*#/
+        end
+
         File.open(directory + "/" + file_name) do |f|
           while line = f.gets
             stats["lines"]     += 1
@@ -55,7 +62,7 @@ class CodeStatistics #:nodoc:
             end
             stats["classes"]   += 1 if line =~ /^\s*class\s+[_A-Z]/
             stats["methods"]   += 1 if line =~ /^\s*def\s+[_a-z]/
-            stats["codelines"] += 1 unless line =~ /^\s*$/ || line =~ /^\s*#/
+            stats["codelines"] += 1 unless line =~ /^\s*$/ || line =~ comment_pattern
           end
         end
       end

railties/lib/rails/tasks/statistics.rake

@@ -3,6 +3,7 @@ STATS_DIRECTORIES = [
   %w(Helpers            app/helpers),
   %w(Models             app/models),
   %w(Mailers            app/mailers),
+  %w(Javascripts        app/assets/javascripts),
   %w(Libraries          lib/),
   %w(APIs               app/apis),
   %w(Integration\ tests test/integration),