As of late, I have been writing a number of answers on CodeGolf.SE, using MUMPS (or a close variant) as my language of choice. MUMPS tends to look remarkably like line noise, whether or not you're trying to golf it. Some syntax highlighting sure would help.
Luckily! The main Prettify repository already has a module for MUMPS. I have used it myself, and can verify that it generally works.