Editors

• Zed and Neovim highlight with the tree-sitter-low grammar; VS Code uses the TextMate grammar in vscode/syntaxes.
• All three start low lsp: diagnostics, hover, go-to-definition, references, rename, document and workspace symbols, completion, signature help, and inlay hints for inferred types. Rename and inlay hints answer only when the program compiles.
• go test ./editors/ fails when the lexer has a keyword that a grammar or highlight query does not cover.

low must be on PATH:

go install ./cmd/low

Grammar

cd editors/tree-sitter-low
npm install
npx tree-sitter generate
npx tree-sitter test

src/ is generated and committed because Zed and Neovim compile src/parser.c directly; regenerate it after every change to grammar.js. Zed and Neovim link to the shared queries/highlights.scm.

VS Code

cd editors/vscode
npm install
npm run package
code --install-extension lowlang-0.1.0.vsix

The lowlang.server.path setting overrides the low binary. The Low: Restart Language Server command restarts it.

Zed

Run zed: install dev extension and choose editors/zed. Zed builds the Rust extension and compiles the grammar at the commit named by rev in extension.toml, so rev must name a commit that contains the current editors/tree-sitter-low/src.

Neovim

Requires Neovim 0.11 or later. With lazy.nvim:

{ dir = "~/path/to/lowlang/editors/nvim", build = "nvim -l build.lua" }

Without a plugin manager, add editors/nvim to runtimepath and run nvim -l editors/nvim/build.lua once. The build compiles the parser to editors/nvim/parser/low.so with cc.

The plugin enables the low language server unless vim.g.low_lsp = false. Indentation uses nvim-treesitter's indentexpr when nvim-treesitter is installed, and cindent otherwise.