Vyi for Visual Studio Code

Language support for Vyi — a small systems language with value semantics, typed absence, and compile-time solving. Syntax highlighting works as soon as the extension is installed. Everything else comes from the vyi-language-server binary that ships with the Vyi toolchain.

Early alpha. The language, compiler, and this extension are under active development.

Requirements

Linux (amd64 or arm64). Vyi does not ship a compiler or language server for macOS or Windows yet. On those systems the extension still highlights .vyi / .vyipac / .vyisum files and tells you the toolchain is Linux-only.
The Vyi toolchain — compiler, language server, and standard library install together:

curl -fsSL https://forgejo.roberthurst.ca/robert/Vyi/raw/branch/master/scripts/install.sh | bash
export PATH="$HOME/.local/bin:$PATH"

Pin a release with VYI_VERSION=v0.1.0 once tags exist. Full options: Install.

If the language server is missing, the extension asks you to install Vyi rather than failing silently. Point vyi.languageServer.path at a binary you built from source if you are hacking on the compiler.

Features

Diagnostics as you type, across every file in the project
Hover — signature, resolved type, and /// doc comment
Completion that knows the cursor: remaining struct fields, members, methods, and enum variants when the expected type is an enum
Go to definition, find references, and rename (including into the standard library)
Quick fixes — fill missing struct fields, add missing switch arms, “did you mean …”, add a missing import
Refactors — extract variable, extract function, inline variable (extracts drop you into a rename)
Signature help, inlay hints, semantic highlighting
Document and workspace symbols, folding
package.vyipac — schema-aware diagnostics and key completion
Syntax highlighting for .vyi, .vyipac, and .vyisum

How projects are analyzed

One language-server process covers the whole workspace. It discovers every Vyi project (a folder containing package.vyipac) under your open folders and treats leftover .vyi files as an orphan graph. The innermost enclosing project owns a file’s diagnostics and interactive features, so a repository that contains several packages just works.

Set vyi.languageServer.target to the same target you build and run with (wasm, x86-64-linux, or arm64-linux) so OS- and arch-gated code is checked correctly. Changing the path or target restarts the server.

Settings

Setting	Default	Description
`vyi.languageServer.path`	`vyi-language-server`	Path to the server binary.
`vyi.languageServer.target`	`wasm`	Analysis target: `wasm`, `x86-64-linux`, or `arm64-linux`.
`vyi.features.inlayHints`	`true`	Inferred-type inlay hints.
`vyi.features.semanticHighlighting`	`true`	Semantic-token coloring.
`vyi.features.diagnostics`	`true`	Error and warning squiggles.
`vyi.features.codeActions`	`true`	Refactors and quick fixes.

Commands

Command	What it does
Vyi: Restart Language Server(s)	Restarts the language server.
Vyi: Language Server Status	Opens the per-program status picker.
Vyi: Toggle Feature…	Check or uncheck the feature toggles above.
Vyi: Install Toolchain…	Copies the install command and links to the docs.

Extract refactors invoke rename automatically — no extra step.

Known limitations

Vyi itself is Linux-only today. Non-Linux editors get highlighting, not language intelligence.
Workspace-symbol search is unavailable in the web playground (Monaco has no workbench symbol search).
With a Vyi project nested inside another Vyi project, the workspace-symbol picker can list a nested symbol twice.

License

Apache-2.0. The Vyi name and branding are reserved; the license covers the software, not the trademark.

Site: vyilang.org · Source: forgejo.roberthurst.ca/robert/Vyi