[Eliah_Lakhin]

> build out a compatible API that can be used with editors/tools that use tree-sitter's library?

That's an interesting idea. Tree-Sitter and Lady Deirdre are quite different in their approaches to parsing. Tree-Sitter is a GLR parser, while Lady Deirdre is a recursive-descent parser. In the Lady Deirdre API, there are customizable traits that let you define new types of files with parsers ("documents" in terms of Lady Deirdre). Perhaps it would be possible to create an adapter, but I would implement it as a separate crate.

> what happens with open-source projects that use this that are then used in commercial projects?

Good question. The idea is that if you link to Lady Deirdre in the Cargo.toml dependencies, it is up to the commercial project authors. They will compile the actual executable intended for selling by downloading both your crate and my crate. However, I'm not a lawyer, and this is not legal advice. Just my thoughts.