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I wrote https://github.com/Mozilla-Ocho/llamafile/blob/main/llamafil... and it does a reasonable job highlighting without breaking for all the .tex files I could find on my hard drive. My goal is to hopefully cover 99.9% of real world usage, since that'll likely cover everything an LLM might output. Esoteric syntax also usually isn't a problem, so long as it doesn't cause strings and comments to extend forever, eclipsing the rest of the source code in a file.

Yes, when goal isn’t to support 100% of all the weird stuff, then it’s orders of magnitude easier!

I couldn't believe it when I learned that \makeatletter does not “make (something) at a letter (character)” but rather “treats the '@' character as a letter when parsing”.

Same with Common Lisp (you can redefine the read table), although that’s likely abused less often on arXiv.