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Jon Ross-Perkins 6f6e46ef57 Migrate tree-sitter support to MODULE.bazel (#4783 )

The WORKSPACE file is deprecated; support is already off by default, and
it'll be removed in the next major bazel release. Our main dependency is
tree-sitter, and I'm trying to address that here.

We're currently using https://github.com/elliottt/rules_tree_sitter, but
that hasn't been updated in a couple years, meaning it lacks
MODULE.bazel support. In the registry, there's
https://registry.bazel.build/modules/tree-sitter-bazel, but this is only
the *parser* libraries of tree-sitter, not the *generator*. I'm using it
for that much, at least.

For the *generator*, which transforms grammar.js to parser.c/h, I'm just
requiring a non-hermetic invocation (i.e., people who want to work on it
will need to install tree-sitter; see the README.md updates). I tried
running it manually, but parser.c is about 600 KB; pre-commit rejects
files that large and I don't think an exception makes sense to override
for this (it'd probably also grow substantially if the grammar were
updated to cover more syntax). In order to make the non-hermetic call
not break "bazel build //..." for most developers, I'm marking most
targets in the package as manual.

Note, I did look long and hard at using `aspect_rules_js`/`rules_nodejs`
to invoke npm. This took a lot of time, and I have a commit that's
mostly working, except I hit a point where it uses `declare_symlink`
which we disallow for compatibility reasons (commit "Lots of work for
figuring out rule_js uses declare_symlink" on the PR). As a consequence,
I think we can't use the primary supported ways to have hermetic npm
calls.

Also, `treesitter` -> `tree_sitter` because it's generally called
`tree-sitter`, two words. We even had a `treesitter/src/tree_sitter`
directory so it's a bit inconsistent.

As far as bugs here, the parser library breaks bazel queries, e.g. the
error:
```
ERROR: Evaluation of query "somepath(//..., @llvm-project//third-party/unittest:gtest)" failed: preloading transitive closure failed: no such package '@@[unknown repo 'platforms' requested from @@tree-sitter-bazel+]//': The repository '@@[unknown repo 'platforms' requested from @@tree-sitter-bazel+]' could not be resolved: No repository visible as '@platforms' from repository '@@tree-sitter-bazel+'
```

I'm just excluding tree_sitter from queries where I can to work around
the error.

2025-01-13 19:04:10 +00:00

carbon.lua

Replace #4505 with a different set of workarounds (#4527 )

2024-12-20 00:33:29 +00:00

README.md

Move the language server into toolchain's busybox. (#4469 )

2024-11-01 19:49:39 +00:00

setup.sh

Migrate tree-sitter support to MODULE.bazel (#4783 )

2025-01-13 19:04:10 +00:00

README.md

Neovim plugin for Carbon

Treesitter based syntax highlighting and language server client for Neovim.

This requires neovim >= 0.9 and nvim-lspconfig to be installed.

Run bazel build //toolchain in project root.
Run utils/nvim/setup.sh.
Start nvim in carbon-lang root folder and open a carbon file.
View document symbols. If you have telescope.nvim installed, you can use :Telescope lsp_document_symbols