Support #run_on_deletion to cleanup generated JavaScript.

lib/guard/coffeescript.rb

@@ -73,6 +73,18 @@ def run_on_change(paths)
       throw :task_has_failed unless success
     end
 
+    # Called on file(s) deletions that the Guard watches.
+    #
+    # @param [Array<String>] paths the deleted files or paths
+    # @raise [:task_has_failed] when run_on_change has failed
+    #
+    def run_on_deletion(paths)
+      Inspector.clean(paths).each do |file|
+        javascript = file.gsub(/(js\.coffee|coffee)$/, 'js')
+        File.remove(javascript) if File.exists?(javascript)
+      end
+    end
+
     private
 
     # Notify changed files back to Guard, so that other Guards can continue

spec/guard/coffeescript_spec.rb

@@ -143,4 +143,14 @@
       guard.run_on_change(['a.coffee', 'b.coffee'])
     end
   end
+
+  describe '#run_on_deletion' do
+    it 'removes generated the generated javascript' do
+      inspector.should_receive(:clean).with(['a.coffee', 'b.coffee', 'c.coffee']).and_return ['a.coffee', 'b.coffee']
+      File.should_receive(:exists?).with('a.js').and_return true
+      File.should_receive(:exists?).with('b.js').and_return false
+      File.should_receive(:remove).with('a.js')
+      guard.run_on_deletion(['a.coffee', 'b.coffee', 'c.coffee'])
+    end
+  end
 end