There's a lot of open issues
A long-lived project that still receives updates
Fast and easy syntax highlighting for selected languages, written in Ruby. Comes with RedCloth integration and LOC counter.
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 Project Readme

CodeRay

Build Status Gem Version Maintainability

About

CodeRay is a Ruby library for syntax highlighting.

You put your code in, and you get it back colored; Keywords, strings, floats, comments - all in different colors. And with line numbers.

Installation

gem install coderay

Dependencies

CodeRay needs Ruby 1.8.7, 1.9.3 or 2.0+. It also runs on JRuby.

Example Usage

require 'coderay'

html = CodeRay.scan("puts 'Hello, world!'", :ruby).div(:line_numbers => :table)

Documentation

See rubydoc.