Lady, EVOLVED 
https://git.ladys.computer/Caudex if you want to see the hard way of doing things before i finish up work on the easy way of doing things
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basically i am leveraging the “expanded archive” functionality from ⛩📰 书社 to take this down to a single .xslt file, which really makes one wonder whether this needs a whole dedicated git repository, although i probably will keep it for the `make +category` functionality which is convenient and nontrivial
“just define a conceptual tarball and expand it” feels kludgy but solves like 95% of the situations where multiple files need to be produced from a single source file, more elegantly than anything else i’ve been able to come up with
allllll of the “catalog”-related stuff in that makefile is going to be dropped, tho, and possibly also the subrepo approach in favour of expecting users to stich things together in the downstream repo