wiki engine (just engine) available?

[loguser at almad.net]

Hello,

I'm thinking about embedding a wiki into one of my project. However, I'm
looking just for a wiki-text-processing library, not a complete out-of-box
solution.

Ideal feature set is ReStructureText, some easy way to add custom commands
(to keep my pages integrated in way Trac is doing) and (ideally) docbook
export (althrough I'm ready to write one).

Suggestions, or do this has to be just-another-wiki-project?

Thank You,

Almad