When programming with ClojureScript, one has to lunch "lein cljsbuild auto" to automatically compiles its ClojureScript sources. It is convenient but a problem remains: the output of the compilation process must be manually read to see if any errors or warnings occur.
To solve this problem I programmed a simple minor mode for Emacs. If you start the cljsbuild command in a terminal buffer, it will watch the ouput and popup the window if an error or a warning occurs. It can also automatically hide the process when the compilation succeed, so that you are able to concentrate on what matters, the code.
Feedback and patches are welcomed!