[Thomashuet]

The reason is that the main project is written in C whereas this fork uses Rust instead as explained in https://github.com/tectonic-typesetting/tectonic/issues/459

[dwohnitmok]

How much of that is auto-generated and pre-existing C code though? My dusty recollection from a while ago is that most of Tectonic's development is in Rust. It looks like the fork is trying to get rid of all the remaining C code?

[hojjat12000]

Here is the percentages of different languages in the original tectonic repo: C: 80.5%, TeX: 7.8%, Rust 7.5%, C++ 4.0%, Other 0.2%

And here is the forked version: Rust 85.2%, TeX 7.3%, C 6.2%, C++ 1.2%, Shell 0.1%

So, looks like %80 more rust in this one (auto-generated and refactored)