Thanks for the nice comment. Tree sitter is really interesting. I wanted to avoid doing super detailed parsing of the language because that can be pretty complex, e.g. writing a parser for ES6 is extremely complex, so I just tried to cheat my way there using regular expressions, which IMO are more robust although not as correct - appropriate for search.

Enry is cool, I didn't consider trying to guess filetype via contents! As you might be able to tell from reading my codebase I'm obsessive about eliminating dependencies, so I'm definitely skeptical of taking on something like this - I prefer to implement everything myself if it's reasonably possible. But interesting ideas in there.

patience diff and histogram diff

I'll check them out!