Redmine

The most Users which use redmine, are programmers.
They need the code highlight syntax very, very often.

• In order to write less, as a editor in wiki
• I want to be able to press a button or a dropdown field, which surrounds my selected text (like bold, italic, underlined, pre, h1, h2 and so on which already does.)

Maybe someone can suggest a plugin if that exists.
Or shows me the code where the editor happens, so I can implement and provide it as plugin.

Many, many, thanks