Planning to wing the pleats may backfire

Yesterday I drew up all the pattern pieces for the wool skirt, as well as
the assembly plan. I gave P a crash course in CFGs, and together we wrote
one for ConTeXt in prep for writing a more-rigidly-formatted one to serve
as input to a program called tree-sitter. With some difficulty we managed
to get most of the easy categories imported. Documentation is extremely
light on the ground, so troubleshooting was frustrating.