Add initial textobjects.scm

[peterkos]

Hi!

I also noticed there wasn't a textobjects.scm, and decided to take a crack at it -- this allows for inter-function, (almost) inter-test jumping in helix, for instance :)

Happy to add more or if y'all want to use as a jumping off point, feel free.

I got setup with the playground, which was relatively simple on macOS:

brew install tree-sitter
brew install emscripten
tree-sitter build-wasm
tree-sitter playground

[alex-pinkus]

Thanks for doing this! Whenever you're ready for review, just make sure you rebase to fix CI.

I'll hold off on releasing 0.4.0 until these changes are ready, unless you think you'll need quite a lot of time for this.

[alex-pinkus]

Something to look into, only if you have the time and inclination, not at all required: is there any way to add tests for this, like we have highlight tests?

[peterkos]

I'll try to get somethin' up by tomorrow 🚀

Are you thinking as in test-npm-package/index.js, or a reference file (which is what test/highlight/* seems like)?

I'm thinking something like what the tree-sitter playground view demonstrates at least -- which could also point out common-but-not-added scenarios:

[alex-pinkus]

I'm thinking something analogous to the contents of test/highlight/*, which gets picked up by tree-sitter test and validated on every build. Nothing fancy like the packaging tests. If tree-sitter test gives us a format for validating these things, we should use that, otherwise no need to bother!

[peterkos]

Ah! This!

I had a bunch of issues trying to run the playground locally for some reason, it kept spinning me into an infinite loop when I modified the query :(

Cool if we go forward as-is?

[alex-pinkus]

Totally! Like I said, not at all required