nvim-treesitter-main

A Nixpkgs overlay for the nvim-treesitter plugin main branch rewrite

Overview

The nvim-treesitter main branch is a full, incompatible rewrite of the project, and the existing master branch is all but abandoned.

The nixpkgs nvim-treesitter plugin is not well equipped to handle the migration today, nor would it be a good idea to switch everyone over given the still-nascent ecosystem around the rewrite. Regardless, you're here because you're both a Nix and Neovim user, and you like to live on the bleeding edge.

nvim-treesitter-main is a flake that builds the new main branch nvim-treesitter, along with all of the parser versions from the parsers.lua file, as recommended by the project.

Usage

** See below if you also plan to install tree-sitter grammars **

In your flake.nix:

    inputs = {
        nvim-treesitter-main.url = "github:iofq/nvim-treesitter-main";
    };
    # ... and import the overlay
    pkgs = import nixpkgs {
      inherit system;
      overlays = [
        inputs.nvim-treesitter-main.overlays.default
      ];
    };

Parsers (withPlugins, withAllGrammars)

nvim-treesitter expects all of the parsers and queries to be installed in a single directory (in a non-nix setting this would be done imperatively via :TSInstall into ~/.local). To pacify it in a nix setting, withPlugins and withAllGrammars have been extended to bundle all defined parsers into a single path, and patch the nvim-treesitter config.lua install_dir setting to point directly at the bundle in the nix store.

A few other neovim plugins define nvim-treesitter as a dependency, meaning we run the risk of having two separate copies of nvim-treesitter presented to Neovim which can cause issues because one copy will not be aware of your installed parsers. To fix, create an overlay like below to redefine nvim-treesitter and any dependent plugins in your nixpkgs set.

If you are not using any other plugins that depend on nvim-treesitter, you may skip this step, but it's still recommended.

overlays = [
  inputs.nvim-treesitter-main.overlays.default
  (final: prev: {
    vimPlugins = prev.vimPlugins.extend (
      f: p: {
        nvim-treesitter = p.nvim-treesitter.withAllGrammars; # or withPlugins...
        # also redefine nvim-treesitter-textobjects (any other plugins that depend on nvim-treesitter)
        nvim-treesitter-textobjects = p.nvim-treesitter-textobjects.overrideAttrs {
          dependencies = [ f.nvim-treesitter ];
        };
      }
    );
  })
];

If you need the unpatched nvim-treesitter plugin without any parsers/queries bundled, even after you overlay it, you can use the nvim-treesitter-unwrapped output of this overlay.

Cache

Add our cachix repo to avoid needing to build grammars locally.

  nix = {
    settings = {
      substituters = [
        "https://nvim-treesitter-main.cachix.org"
      ];
      trusted-public-keys = [
        "nvim-treesitter-main.cachix.org-1:cbwE6blfW5+BkXXyeAXoVSu1gliqPLHo2m98E4hWfZQ="
      ];
    };
  };

Updating

To update the list of parsers in generated.nix:

nix flake update
nix develop --command "generate-parsers"

This runs a lua script similar to the old update.py, but uses the nvim-treesitter as a source for version info instead of the NURR json file.

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