Previous thread (#1787) was focused on tree-sitter but it might turn out to not be the best choice due to size (some syntaxes are 90MB+) and slowness to load (which is planned to be fixed eventually).

An alternative would be to write a textmate parser so we can re-use all of VSCode syntaxes/themes since it has a big momentum and should not be too hard to write. I have a branch with just the serde structs in https://github.com/getzola/giallo/tree/tm
We can use https://github.com/rust-onig/rust-onig for the regex library, like syntect is doing.