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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.

gem install coderay

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

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

Seerubydoc.