acarapetis/nvim-treesitter-jjconfig

---

acarapetis/nvim-treesitter-jjconfig.json

{
  "createdAt": "2025-08-09T03:25:38Z",
  "defaultBranch": "main",
  "description": "treesitter injections for jj config files in neovim",
  "fullName": "acarapetis/nvim-treesitter-jjconfig",
  "homepage": "",
  "language": "Lua",
  "name": "nvim-treesitter-jjconfig",
  "pushedAt": "2026-03-23T11:39:22Z",
  "stargazersCount": 6,
  "topics": [
    "jj",
    "jujutsu",
    "neovim",
    "neovim-plugin",
    "nvim-treesitter",
    "treesitter"
  ],
  "updatedAt": "2026-03-23T11:39:26Z",
  "url": "https://github.com/acarapetis/nvim-treesitter-jjconfig"
}

nvim-treesitter-jjconfig

NOTE: This version of nvim-treesitter-jjconfig is compatible only with the new main branch of nvim-treesitter. If you’re still using the master branch of nvim-treesitter you can use our corresponding master branch, but note that it will not receive any future features.

This is a neovim plugin providing filetype detection and a treesitter parser for revset expressions and templates inside jj and jjui configuration files.

jj config features

The jjconfig parser provides syntax highlighting and autoindentation for:

• toml strings containing jj revset expressions (via the injected jjrevset parser):
  • in [revsets]/[revset-aliases] tables
  • in command aliases when immediately following “—revisions”, “—from”, “—to”, etc. (I’ve left out the short forms for now because they seem likely to trigger false positives.)
• toml strings containing jj templates (via the injected jjtemplate parser):
  • in [templates]/[template-aliases] tables
  • in command aliases when immediately following “—template” or “-T”.
• toml strings containing shell scripts:
  • in command aliases when immediately following the sequence “sh”, “-c” or “bash”, “-c”.

![screenshot]!(./screenshot.png)

These features should be activated whenever you’re editing a toml file that declares its schema to be jj’s config-schema, either with a top-level JSON Schema declaration:

"$schema" = "https://jj-vcs.github.io/jj/latest/config-schema.json"

or with a Taplo/Tombi schema directive comment:

#:schema https://docs.jj-vcs.dev/latest/config-schema.json

Note that this schema directive comment must be part of a comment block at the very top of the file.

jjui config features

The jjui parser provides syntax highlighting and autoindentation for:

• lua scripts in jjui custom commands

This is activated whenever you’re editing a file called config.toml in a directory called jjui.

Dependencies

• nvim-treesitter (main branch)

Installation

Install this neovim plugin in whatever manner you prefer, and somewhere in your setup call require("nvim-treesitter-jjconfig").setup(). This registers the parsers jjconfig, jjrevset, jjtemplate and jjui with nvim-treesitter, so they are then available to install via :TSInstall or require("nvim-treesitter").install.

Example lazy.nvim config below. Note the dependency order - we want nvim-treesitter-jjconfig to be loaded first so that nvim-treesitter”s build step includes our parsers.

return {
    {
        "nvim-treesitter/nvim-treesitter",
        branch = "main",
        lazy = false,
        build = ":TSUpdate",
        dependencies = {
            "acarapetis/nvim-treesitter-jjconfig",
            branch = "main",
            opts = {},
        },
        config = function()
            local ts = require("nvim-treesitter")
            ts.install({ "jjconfig", "jjrevset", "jjtemplate", "jjui" })
            vim.api.nvim_create_autocmd("FileType", {
                pattern = "*",
                callback = function(ev)
                    pcall(vim.treesitter.start, ev.buf)
                    vim.bo[ev.buf].indentexpr = "v:lua.require'nvim-treesitter'.indentexpr()"
                end
            })
        end,
    }
}

Thanks

This would not be possible without the jjtemplate and jjrevset parsers by bryceberger.

The syntax highlighting queries for jjtemplate and jjrevset included in this repo were originally written by bryceberger for helix.

Thanks to bryceberger and algmyr for a fruitful conversation on the JJ discord.