How to show code on html with ruby?

How to show code on html with ruby?

References

Reference NO 1

http://stackoverflow.com/questions/15202299/how-to-show-code-on-html-with-ruby

Reference NO 2

http://stackoverflow.com/questions/3218397/ruby-on-rails-display-html-source-code-instead-of-rendering-it

Reference NO 3

http://www.bigfastblog.com/syntax-highlight-your-ruby-code-in-html

Reference NO 4

http://www.rubyinside.com/using-ripper-to-see-how-ruby-is-parsing-your-code-5270.html

Reference NO 5

http://www.ruby-doc.org/docs/ProgrammingRuby/html/preface.html

Reference NO 6

http://pdfcrowd.com/web-html-to-pdf-ruby/

Reference NO 7

http://sphinx-doc.org/markup/code.html

Reference NO 8

http://ruby.railstutorial.org/chapters/user-microposts