With the backtick_codeblock filter you can use Github’s lovely back tick syntax highlighting blocks. Simply start a line with three back ticks followed by a space and the language you’re using.

Syntax

``` [language] [title] [url] [link text]
code snippet
```

Example (plain)

```
$ sudo make me a sandwich
```

1

$ sudo make me a sandwich

Example With Syntax Highlighting a Caption and Link

``` ruby Discover if a number is prime http://www.noulakaz.net/weblog/2007/03/18/a-regular-expression-to-check-for-prime-numbers/ Source Article
class Fixnum
  def prime?
    ('1' * self) !~ /^1?$|^(11+?)\1+$/
  end
end
```

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class Fixnum
  def prime?
    ('1' * self) !~ /^1?$|^(11+?)\1+$/
  end
end