Use coffee watch command to watch whole directories, so that it will pick up new…

Use coffee watch command to watch whole directories, so that it will pick up new coffee files as they are created

rakefiles/assets.rake

@@ -27,10 +27,11 @@ def coffee_cmd(watch=false, debug=false)
         #
         # Ref: https://github.com/joyent/node/issues/2479
         #
-        # Instead, watch 50 files per process in parallel
+        # Rather than watching all of the directories in one command
+        # watch each static files subdirectory separately
         cmds = []
-        Dir['*/static/**/*.coffee'].each_slice(50) do |coffee_files|
-            cmds << "node_modules/.bin/coffee --watch --compile #{coffee_files.join(' ')}"
+        ['lms/static/coffee', 'cms/static/coffee', 'common/static/coffee', 'common/static/xmodule'].each do |coffee_folder|
+            cmds << "node_modules/.bin/coffee --watch --compile #{coffee_folder}"
         end
         cmds
     else
@@ -119,12 +120,15 @@ namespace :assets do
     namespace :sass do
         # In watch mode, sass doesn't immediately compile out of date files,
         # so force a recompile first
-        task :_watch => 'assets:sass:debug'
+        # Also force xmodule files to be generated before we start watching anything
+        task :_watch => ['assets:sass:debug', 'assets:xmodule']
         multitask :debug => 'assets:xmodule:debug'
     end
 
     multitask :coffee => 'assets:xmodule'
     namespace :coffee do
+        # Force xmodule files to be generated before we start watching anything
+        task :_watch => 'assets:xmodule'
         multitask :debug => 'assets:xmodule:debug'
     end
 end