couleuvre 0.0.1

Vyper Language Server

Couleuvre

A lightweight Language Server for Vyper. It parses Vyper modules, extracts symbols, and supports basic navigation such as go-to-definition (including across imports), works with any Vyper versions, and doesn't require Vyper to be installed.

Features

Feature	Status
Syntax Highlighting	❌ Planned
Go to Definition	⚠️ Alpha
Go to Modules	⚠️ Alpha
Document Symbols	✅ Supported
Workspace Symbols	❌ Planned
References	❌ Planned
Hover Information	❌ Planned
Diagnostics (Errors/Warnings)	❌ Planned
Code Completion	❌ Planned
Document Formatting	❌ Planned

• Automatic environment handling:
  • If the current environment already has the requested vyper version, use it directly
  • Otherwise, spin up and cache a dedicated uv-managed venv with the required vyper version

Requirements

• Python >= 3.10
• uv (https://github.com/astral-sh/uv)

Installation

uv sync

Usage

• As an LSP server (from source):

uv run -m couleuvre

• Through the VScode extension

How Vyper version is selected

• Contracts can specify the compiler version via a pragma or annotation in the source.
• If no version is found, a default can be provided by the server or it will error.
• Environment usage:
  • If the running environment's vyper matches the contract's version, it is used directly. This allows for resolving imports by using the current environment's search paths (e.g. snekmate)
  • Otherwise, Couleuvre creates/uses a cached virtualenv (via uv) for that version and runs Vyper with that interpreter. In this case, external imports are not resolved.

Your editor should connect to the server via stdio (pygls). Point your client configuration to the above command.

Testing

uv run pytest

Alternatives

• The official Vyper Language Server (https://github.com/vyperlang/vyper-lsp) is more feature-complete but only supports Vyper >= 0.4.1 and requires Vyper to be installed in the environment.

Disclaimer

Couleuvre is in early development, use at your own risk. Couleuvre is not affiliated with the Vyper project.