Code highlighting with Rails

"Whether we're building a blog, a CMS, a documentation site, or any other Rails app that accepts user-generated markdown, adding syntax highlighting to code blocks is an essential feature.In this article, we will learn how to add syntax highlighting to Rails applications by showing different ways to do it and a couple of nice tricks to improve the user experience."

"As developers, there usually comes a time when we have to deal with syntax highlighting.Whether we're building a blog, a CMS, a documentation site, or any other Rails app that accepts user-generated markdown, adding syntax highlighting to code blocks is an essential feature."

Syntax highlighting makes code blocks in Rails applications easier to read and understand. Integrate a highlighter at render time using server-side libraries or at display time using client-side libraries. Use a Markdown processor that supports fenced code blocks, then pipe output through a highlighter and an HTML sanitizer to avoid XSS. Optimize for performance with caching, asset precompilation, and selective highlighting of long files. Improve usability by adding line numbers, copy-to-clipboard buttons, and theme switching. Test rendering across browsers and mobile devices and choose libraries that balance features, performance, and maintenance overhead.

Read at Rubyflow