Lately, I have been working on the awesome open source project 4Clojure.com. The site helps you to learn Clojure by solving “koan” type problems in an interactive format. One of the enhancements that I was looking at putting in was a way to enter code in a text box and have it color highlight as type. I found the ACE project, which looked like exactly what I wanted. However, sad panda, they didn’t have a Clojure mode. Not deterred, I decided that I would try to take a crack at it. I ported most of the rules from the Clojure brush in Syntax Highlighter over and implemented some basic auto-indent.