The thorny issue that `fontconfig` handles is mapping from a high-level
specification of a font (e.g., family, weight, slant) — that is, how a user
would typically specify a font — to an actual font file on disk.
The shortcoming with font filenames is that they don't reliably tell you
anything
I knocked together a very minimal pure-Racket library for this so you
don't have to FFI. It won't give you all the bells and whistles, but
it should be a good starting point.
https://pkgd.racket-lang.org/pkgn/package/font-finder
Docs: https://github.com/dstorrs/font-finder/blob/master/README.m
The answer is you can't, through pure Racket, because Racket delegates the
nitty-gritty of font-file resolution to external font-handling libraries.
It is possible, however, to call into the `fontconfig` library via the FFI and
make it do the heavy lifting of 1) scanning font directories to amas
IIUC every `font%` object must correspond to a particular font file on disk.
If so, given a `font%` object, how do I extract the path to that file?
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