nixd

Nix language server

Note: This server is working in progress!

Status page: nix-community#49

Please join our matrix room (https://matrix.to/#/#nixd:matrix.org) for internal testing & feedback.

About

This is a Nix language server that directly uses (i.e., is linked with) the official Nix library (https://github.com/NixOS/nix).

Some notable features provided by linking with the Nix library include:

• Diagnostics and evaluation that produce identical results as the real Nix command.
• Shared eval caches (flake, file) with your system's Nix.
• Native support for cross-file analysis.
• Precise Nix language support. We do not maintain "yet another parser & evaluator".
• Support for built-ins, including Nix plugins.

Features Preview

Write a package using nixd

Native cross-file analysis

Handle evaluations exactly same as nix evaluator

Support *all* builtins

And diagnostic:

Eval nixpkgs

Print internal AST Node type, and evalution result just as same as nix repl

Complete dynamic envs, like `with` expression

Resources

• User Guide
• Developers' Manual (internal design, contributing):
• Project matrix room: https://matrix.to/#/#nixd:matrix.org

Tooling

We provide some extra tools based on our codebase.

nix-ast-dump

Used for dumping internal data structures in nix parser.

Demo: all-grammar.nix