enable OpenType features globally

[Malte Meyn]

Hi list,

I could find neither a post on this list (or on devel) nor an issue on 
the tracker but I cannot imagine this has never been asked for anywhere, 
did I miss something?

Currently, it’s only possible to \override the font-features list for 
every single grob (okay, you can use something like snippet 443 
http://lsr.di.unimi.it/LSR/Item?id=443 for automization) and for every 
single markup. It would be nice if you could set font features when 
selecting the font in the \paper block:

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\paper {
  #(define fonts
    (set-global-fonts
     #:music "cadence"
     #:brace "cadence"
     #:roman "Vollkorn:liga=0&dlig&zero"
     #:factor (/ staff-height pt 20)))
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

This would set Vollkorn as roman font, disable liga (for example ff 
ligature), and enable dlig (for example st ligature) and slashed zero. 
The suggested syntax using : and & is how it’s done in LibreOffice.

Cheers,
Malte