Nix language server that evaluates code

Related tags

System tools nix lsp
Overview

nix-eval-lsp

Still use nix-community/rnix-lsp. This repo is a work in progress.

nix-eval-lsp is an experimental language server for Nix. It provides completions and tooltips by efficiently evaluating Nix expressions as they are typed.

Features

  • hover over an expression to see its value
  • auto-complete inside expressions such as with pkgs; [ ]
  • goto definitions across files
  • clickable paths and urls
  • auto-formatting using nixpkgs-fmt
  • helpful documentation for builtins
  • caching of lambda parameters to make callPackage derivations easier to write
  • auto-complete for lambda arguments, with documentation comments extracted from source code
  • snippets for common Nix expressions

Important note: the evaluator is developed for the purpose of debugging tools only. It does not aim to correctly implement Nix in its entirety.

Usage

  1. Install the Nix IDE extension for VS Code
  2. git clone https://github.com/aaronjanse/nix-eval-lsp.git && cd nix-eval-lsp
  3. Run nix build, nix-build, or RUSTC_BOOTSTRAP=1 cargo build --release (the --release is important!)
  4. Copy the absolute path of the built binary into Nix IDE's settings (search "nix" then edit the "server path" field)
  5. Make sure "Nix: Enable Language Server" is set to true
  6. Restart VS Code ("Reload Window" in command palette)

Try it out

Here's an expression to try out the LSP:

let
  pkgs = import /path/to/nixpkgs {};
  foo = pkgs.gcc;
in
with pkgs; [
  htop hello
]

Credits

Huge thank you to @jd91mZM2 for nix-community/rnix-parser.

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Comments
  • support outside of vscode?

    support outside of vscode?

    I'm a kakoune user and I can't get this to work at all. I've also tried using it from helix. Both have standard lsp implementations so I'm not sure what the issue is.

    opened by nrdxp 2
Releases(v0.1.0)
Owner
Aaron Janse
UC Berkeley '24
Aaron Janse
GitHub https://github.com/nix-community/rnix-lsp
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