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This looks interesting. What are those .patel files? [1]

[1]: https://github.com/be5invis/Iosevka/tree/master/glyphs

I don't know, but at a guess, it's a language which compiles down to PostScript. curveTo and lineTo are PostScript functions, and there is a concept of a current transform.

Nope, it compiles to JavaScript. The compiler is in http://github.com/be5invis/PatEL and it uses Patrisika (http://github.com/be5invis/patrisika) as its backend (which converts S-expression-ish AST into Mozilla AST, and generates JavaScript using Escodegen).

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