[gentoo-user] SOT (Slightlt OffTopic): Scriptable Documentation system (HTML/PDF) ?

Hi,

to create documentation about changes in the
contents of releases, of the installation 
instruction and in system requirements I need
a system, which is scriptable and therefore
automatable.

Current state is to make or changes manually
in the different docs.

Is TeX the right choice for the document
generating backend?

What can be choosen as "glue" between the 
"outside world" and TeX?

Thank you very much for any regarding this
problem! :)

Cheers
Meino