These functions return the variants and the styles available for a
given fontset.
Usage
fontset_variants(fontset)
fontset_styles(fontset, variant)
Arguments
fontset
A string giving the name of a set of fonts
(e.g. "Liberation" or"Bitstream Vera"). Use
fontset_list() to obtain the list of fontsets
registered in your session.
variant
Font variant, as per Fontconfig's nomenclature. Use
fontset_variants() to find out which variants are
available for a fontset.