Help:Syntax Highlighting

Rosetta Code supports syntax highlighting of code using GeSHi, the Generic Syntax Highlighter.

At the moment, the wiki is switching from old-style to new-style highlighting. Old-style highlighting will still work for a while, but only the new style is documented below.

How to highlight

Prefix your code with <lang foo> (where foo is the language to use for highlighting) and suffix it with </lang>. Be sure not to insert extra space between the tags and your code. For example, here's how you'd highlight a C program:

<lang c>int main (int argc, char* argv[])
{
  return 0;
}</lang>

That markup would be rendered thus:

<lang c>int main (int argc, char* argv[]) {

 return 0;

}</lang>

Supported languages

See this post on the Village Pump for a list of language names. Make sure to use the standard identifier for your language even if GeSHi doesn't know how to highlight it yet. If your language isn't in the list, make up an identifier (consisting entirely of lowercase alphanumeric ASCII characters; make it short yet unambiguous) and add it to the list. That way, if your language is supported in a future release of GeSHi, Rosetta Code can immediately benefit.

If you'd like to, it's surprisingly easy to write a new language definition for GeSHi. See this post for more on the relationship between GeSHi and Rosetta Code.