Function rtf_to_styled 

pub fn rtf_to_styled(rtf: &str, style: DocStyle) -> StyledText

Parse the RTF subset Day writes, plus the control words a real editor puts around it (docs/texteditor.md).

Reads: \b \i \ul \uldb \uld \ulwave \strike \fs \cf \highlight \f, the \fonttbl and \colortbl tables, \par \line \tab, \pard \ql \qc \qr \qj \li \sb \sa, \'hh and \uN escapes, and group nesting for style scoping. Skips {\*\…} destinations whole. Everything else is ignored, which is what keeps a Word document from producing garbage rather than nothing.