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I hope we can have a library for this kind of formatting so each new $hotlanguage can have $hotlanguagefmt easily..

There's an effort to make a plugin system for Prettier so that it can format languages other than JS and company. See https://prettier.io/docs/en/plugins.html

Speaking of hot new languages, check out ArnoldC https://github.com/lhartikk/ArnoldC