[ale] [OT] Document formatter?

[leam hall]

I'm trying to learn multi-purpose tools. Right now I need something to
document my Ruby code and to also take text based fiction and turn it
into a pdf with bold headers and appropriate page breaks. As a last
resort I can open the text doc in LibreOffice and save as a PDF.

A friend uses Doxygen for his project, I'm looking for some options.
The goal is to be able to run it on the command line.

Suggestions?

Leam